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Dual 12-Bit, High Bandwidth, Multiplying DAC with 4-Quadrant Resistors and Parallel Interface
AD5405
FEATURES
On chip 4-quadrant resistors allow flexible output ranges 10 MHz multiplying bandwidth Fast parallel interface write cycle: 58 MSPS 2.5 V to 5.5 V supply operation 10 V reference input Extended temperature range: -40C to 125C 40-lead LFCSP package Guaranteed monotonic 4-quadrant multiplication Power-on reset Readback function .5 A typical current consumption
GENERAL DESCRIPTION
The AD54051 is a dual CMOS, 12-bit, current output digitalto-analog converter (DAC).This device operates from a 2.5 V to 5.5 V power supply, making it suited to battery-powered and other applications. The applied external reference input voltage (VREF) determines the full-scale output current. An integrated feedback resistor (RFB) provides temperature tracking and full-scale voltage output when combined with an external I-to-V precision amplifier. This device also contains all the 4-quadrant resistors necessary for bipolar operation and other configuration modes. This DAC utilizes data readback, allowing the user to read the contents of the DAC register via the DB pins. On power-up, the internal register and latches are filled with zeros and the DAC outputs are at zero scale. As a result of manufacture with a CMOS submicron process, the device offers excellent 4-quadrant multiplication characteristics, with large signal multiplying bandwidths of up to 10 MHz. The AD5405 has a 6 mm x 6 mm, 40-lead LFCSP package.
APPLICATIONS
Portable battery-powered applications Waveform generators Analog processing Instrumentation applications Programmable amplifiers and attenuators Digitally-controlled calibration Programmable filters and oscillators Composite video Ultrasound Gain, offset, and voltage trimming
R3A R3 2R R2_3A R2 2R R2A
1
US Patent Number 5,689,257.
VREF A R1A
AD5405
VDD DATA INPUTS DB0 DB11 INPUT BUFFER
R1 2R
RFB 2R RFBA
LATCH
12-BIT R-2R DAC A
IOUT1A IOUT2A
DAC A/B CS R/W LATCH LDAC POWER-ON RESET CONTROL LOGIC 12-BIT R-2R DAC B IOUT1B IOUT2B RFB B
04463-0-001
GND
R3 2R R3B R2_3B
R2 2R R2B
R1 2R VREFB R1B
RFB 2R
Figure 1. AD5405 Functional Block Diagram
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 (c) 2004 Analog Devices, Inc. All rights reserved.
AD5405 TABLE OF CONTENTS
Specifications..................................................................................... 3 Timing Characteristics..................................................................... 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ............................................. 8 Terminology .................................................................................... 13 General Description ....................................................................... 14 DAC Section................................................................................ 14 Circuit Operation ....................................................................... 14 Single-Supply Applications........................................................ 15 Positive Output Voltage ............................................................. 15 Adding Gain................................................................................ 15 Used as a Divider or Programmable Gain Element............... 16 Reference Selection .................................................................... 16 Amplifier Selection .................................................................... 16 Parallel Interface......................................................................... 17 Microprocessor Interfacing....................................................... 17 PCB Layout and Power Supply Decoupling ........................... 17 Evaluation Board for the DACs................................................ 18 Overview of AD54xx Devices....................................................... 22 Outline Dimensions ....................................................................... 23 Ordering Guide .......................................................................... 23
REVISION HISTORY
7/04--Revision 0: Initial Version
Rev. 0 | Page 2 of 24
AD5405 SPECIFICATIONS1
VDD = 2.5 V to 5.5 V, VREFA = VREFB = 10 V, IOUT2 = 0 V. All specifications TMIN to TMAX, unless otherwise noted. DC performance measured with OP1177, AC performance with AD9631, unless otherwise noted. Table 1.
Parameter STATIC PERFORMANCE Resolution Relative Accuracy Differential Nonlinearity Gain Error Gain Error Temp Coefficient2 Bipolar Zero-Code Error Output Leakage Current REFERENCE INPUT Reference Input Range VREFA, VREFB Input Resistance VREFA to VREFB Input Resistance Mismatch R1, RFB Resistance R2, R3 Resistance R2 to R3 Resistance Mismatch DIGITAL INPUTS/OUTPUT Input High Voltage, VIH Input Low Voltage, VIL
2 2
Min
Typ
Max 12 1 -1/+2 25
Unit Bits LSB LSB mV ppm FSR/C mV nA nA V k % k k % V V V A pF V V V V MHz ns ns nV-s dB pF pF nV-s dB dB nV/Hz
Conditions
Guaranteed monotonic
5 25 1 10 10 10 1.6 20 20 .06
Data = 0x0000, TA = 25C, IOUT1 Data = 0x0000H, IOUT1 Typical resistor TC = -50 ppm/C DAC input resistance Typ = 25C, Max = 125C
8
12 2.5 24 24 .18
16 16
Typ = 25C, Max = 125C VDD = 2.5 V to 5.5 V VDD = 2.7 V to 5.5 V VDD = 2.5 V to 2.7 V
1.7 0.8 0.7 1 10 0.4 VDD - 1 0.4 VDD -0.5 10 80 20 3
Input Leakage Current, IIL Input Capacitance VDD = 4.5 V to 5.5 V Output Low Voltage, VOL Output High Voltage, VOH VDD = 2.5 V to 3.6 V Output Low Voltage, VOL Output High Voltage, VOH DYNAMIC PERFORMANCE Reference Multiplying BW Output Voltage Settling Time
2
ISINK = 200 A ISOURCE = 200 A ISINK = 200 A ISOURCE = 200 A VREF = 5 V pk-pk, DAC loaded all 1s Measured to 1 mV of FS. RLOAD = 100 , CLOAD =15 pF. DAC latch alternately loaded with 0s and 1s. 1 LSB change around major carry, VREF = 0 V DAC latch loaded with all 0s. Reference = 10 kHz DAC latches loaded with all 0s DAC latches loaded with all 1s Feedthrough to DAC output with CS high and alternate loading of all 0s and all 1s VREF = 5 V p-p, all 1s loaded, f = 1 kHz VREF = 5 V, sine wave generated from digital code @ 1 kHz
120 40 -75 2 4
Digital Delay Digital-to-Analog Glitch Impulse Multiplying Feedthrough Error Output Capacitance Digital Feedthrough Total Harmonic Distortion Output Noise Spectral Density
5 -75 -75 25
Rev. 0 | Page 3 of 24
AD5405
Parameter SFDR Performance (Wideband) Clock = 10 MHz 500 kHz fOUT 100 kHz fOUT 50 kHz fOUT Clock = 25 MHz 500 kHz fOUT 100 kHz fOUT 50 kHz fOUT SFDR Performance (Narrow Band) Clock = 10 MHz 500 kHz fOUT 100 kHz fOUT 50k Hz fOUT Clock = 25 MHz 500 kHz fOUT 100 kHz fOUT 50k Hz fOUT Intermodulation Distortion Clock = 10 MHz f1 = 400 kHz, f2 = 500 kHz f1 = 40 kHz, f2 = 50 kHz Clock = 25 MHz f1 = 400 kHz, f2 = 500 kHz f1 = 40 kHz, f2 = 50 kHz POWER REQUIREMENTS Power Supply Range IDD Power Supply Sensitivity
2
Min
Typ
Max
Unit
Conditions
55 63 65 50 60 62
dB dB dB dB dB dB
73 80 87 70 75 80
dB dB dB dB dB dB
65 72 51 65 2.5 5.5 10 0.001
dB dB dB dB V A %/%
Logic inputs = 0 V or VDD VDD = 5%
1 2
Temperature range for Y version is -40C to +125C. Guaranteed by design, not subject to production test.
Rev. 0 | Page 4 of 24
AD5405 TIMING CHARACTERISTICS
VDD = 2.5 V to 5.5 V, VREF = 5 V, IOUT2 = 0 V. All specifications TMIN to TMAX, unless otherwise noted. Table 2.
Parameter1, 2 Write Mode t1 t2 t3 t4 t5 t6 t7 t8 t9 Data Readback Mode t10 t11 t12 t13 Limit at TMIN, TMAX 0 0 10 10 0 6 0 5 7 0 0 5 35 5 10 Unit ns min ns min ns min ns min ns min ns min ns min ns min ns min ns typ ns typ ns typ ns max ns typ ns max Conditions/Comments R/W to CS setup time R/W to CS hold time CS low time Address setup time Address hold time Data setup time Data hold time R/W high to CS low CS min high time Address setup time Address hold time Data access time Bus relinquish time
1 2
See Figure 2. Temperature range for Y version is -40C to +125C. Guaranteed by design and characterization, not subject to production test. All input signals are specified with tr = tf = 5ns (10% to 90% of VDD) and timed from a voltage level of (VIL + VIH)/2. Digital output timing measured with load circuit in Figure 3.
R/W
t1
t2
t8
t2
t9
CS
t3 t4 t5 t 10 t 11
DACA/DACB
t6
DATA
DATA VALID
DATA VALID
Figure 2. Timing Diagram
200A TO OUTPUT PIN
IOL
VOH (MIN) + VOL (MAX)
CL 50pF 200A IOH
2
04463-0-003
Figure 3. Load Circuit for Data Timing Specifications
Rev. 0 | Page 5 of 24
04463-0-002
t7
t 12
t 13
AD5405 ABSOLUTE MAXIMUM RATINGS
TA = 25C, unless otherwise noted. Table 3.
Parameter VDD to GND VREFA, VREFB, RFBA, RFBB to GND IOUT1, IOUT2 to GND Logic Inputs and Output1 Operating Temperature Range Automotive (Y Version) Storage Temperature Range Junction Temperature 40-lead LFCSP, JA Thermal Impedance Lead Temperature, Soldering (10 sec.) IR Reflow, Peak Temperature (< 20 sec.) Rating -0.3 V to +7 V -12 V to +12 V -0.3 V to +7 V -0.3V to VDD + 0.3 V -40C to +125C -65C to +150C 150C 30C/W 300C 235C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
1
Over voltages at DBx, LDAC, CS, and W/R are clamped by internal diodes. Current should be limited to the maximum ratings given.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
Rev. 0 | Page 6 of 24
AD5405 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
40 RFB A 39 IOUT2A 38 IOUT1A 37 NC 36 NC 35 NC 34 NC 33 IOUT1B 32 IOUT2B 31 RFBB
R1A 1 R2A 2 R2_3A 3 R3A 4 VREFA 5 DGND 6 LDAC 7 DAC A/B 8 NC 9 DB11 10
PIN 1 INDICATOR
AD5405
TOP VIEW
30 R1B 29 R2B 28 R2_3B 27 R3B 26 VREF B 25 VDD 24 CLR 23 R/W 22 CS 21 DB0
DB10 11 DB9 12 DB8 13 DB7 14 DB6 15 DB5 16 DB4 17 DB3 18 DB2 19 DB1 20
NC = NO CONNECT
Figure 4. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. 1 to 4 5, 26 6 7 Mnemonic R1A to R3A VREFA, VREFB DGND LDAC Function DAC A 4-Quadrant Resistors. Allow a number of configuration modes, including bipolar operation with minimum of external components. DAC Reference Voltage Input Terminals. Digital Ground Pin. Load DAC Input. Allows asynchronous or synchronous updates to the DAC output. The DAC is asynchronously updated when this signal goes low. Alternatively, if this line is held permanently low, an automatic or synchronous update mode is selected whereby the DAC is updated on the rising edge of CS. Selects DAC A or B. Low selects DAC A, while high selects DAC B. Not internally connected. Parallel Data Bits 11 through 0. Chip Select Input. Active low. Used in conjunction with R/W to load parallel data to the input latch or to read data from the DAC register. Edge sensitive; when pulled high, the DAC data is latched. Read/Write. When low, used in conjunction with CS to load parallel data. When high, used in conjunction with CS to read back contents of DAC register. Active Low Control Input. Clears DAC output and input and DAC registers. Positive Power Supply Input. These parts can be operated from a supply of 2.5 V to 5.5 V. DAC B 4-Quadrant Resistors. Allow a number of configuration modes, including bipolar operation with a minimum of external components. DAC A Analog Ground. This pin typically should be tied to the analog ground of the system, but may be biased to achieve single-supply operation. DAC B Current Outputs. DAC A Current Outputs. DAC A Analog Ground. This pin typically should be tied to the analog ground of the system, but may be biased to achieve single-supply operation. External Amplifier Output.
8 9, 34, 35, 36, 37 10 to 21 22 23 24 25 26 to 30 32 33 38 39 31, 40
DAC A/B NC DB11 to DB0 CS R/W CLR VDD R3B to R1B IOUT2B IOUT1B IOUT1A IOUT2A RFBB, RFBA
Rev. 0 | Page 7 of 24
04463-0-004
AD5405 TYPICAL PERFORMANCE CHARACTERISTICS
1.0 0.8 0.6 0.4 TA = 25C VREF = 10V VDD = 5V
-0.40 TA = 25C VREF = 10V VDD = 5V -0.45
-0.50
0 -0.2 -0.4 -0.6 -0.8 0 500 1000 1500 2000 CODE 2500 3000 3500 4000
04463-0-030
DNL (LSB)
INL (LSB)
0.2
-0.55
-0.60 MIN DNL -0.65
2
3
4
5
6
7
8
9
10
REFERENCE VOLTAGE
Figure 5. INL vs. Code (12-Bit DAC)
Figure 8. DNL vs. Reference Voltage
1.0 0.8 0.6 0.4 TA = 25C VREF = 10V VDD = 5V
5 4 3 2 VDD = 5V
ERROR (mV)
DNL (LSB)
0.2 0 -0.2 -0.4 -0.6 -0.8
04463-0-031
1 0 -1 -2 -3 -4 -5 -60 VREF = 10V
04463-0-034
VDD = 2.5V
-1.0 0 500 1000 1500 2000 CODE 2500 3000 3500 4000
-40
-20
0
20
40
60
80
100
120
140
TEMPERATURE (C)
Figure 6. DNL vs. Code (12-Bit DAC)
Figure 9. Gain Error vs. Temperature
0.6 0.5 0.4 MAX INL
8 TA = 25C 7 6
CURRENT (mA)
0.3
5 4 3 2 1
INL (LSB)
VDD = 5V
0.2 0.1 0 MIN INL -0.1 -0.2
04463-0-032
TA = 25C VREF = 10V VDD = 5V
VDD = 3V VDD = 2.5V
-0.3 2 3 4 5 6 7 8 9 10 REFERENCE VOLTAGE
0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V)
Figure 7. INL vs. Reference Voltage
Figure 10. Supply Current vs. Logic Input Voltage
Rev. 0 | Page 8 of 24
04463-0-013
04463-0-034
-1.0
-0.70
AD5405
1.6 1.4 1.2 1.0 0.8 IOUT1 VDD 3V 0.6 0.4 0.2
04463-0-036
IOUT LEAKAGE (nA)
GAIN (dB)
IOUT1 VDD 5V
0 -40
-20
0
20
40
60
80
100
120
1
10
100
1k 10k 100k FREQUENCY (Hz)
1M
10M
100M
TEMPERATURE (C)
Figure 11. IOUT1 Leakage Current vs. Temperature
Figure 14. Reference Multiplying Bandwidth vs. Frequency and Code
0.50 0.45 VDD = 5V 0.40 0.35 TA = 25C
0.2
0
CURRENT (A)
ALL 0s 0.25 0.20 0.15 0.10 0.05
04463-0-037
ALL 1s VDD = 2.5V
GAIN (dB)
0.30
-0.2
-0.4 TA = 25C VDD = 5V VREF = 3.5V CCOMP = 1.8pF AD8038 AMPLIFIER AD5405 DAC 1 10 100 1k 10k 100k 1m 10m 100m
04463-0-029
ALL 1s
ALL 0s
-0.6
0 -60
-0.8 FREQUENCY (Hz)
-40
-20
0
20
40
60
80
100
120
140
TEMPERATURE (C)
Figure 12. Supply Current vs. Temperature
14 TA = 25C LOADING ZS TO FS VDD = 5V
Figure 15. Reference Multiplying Bandwidth-All 1s Loaded
3
12
TA = 25C VDD = 5V AD5405
10
0
IDD (mA)
8 6
GAIN (dB)
-3
VDD = 3V
4 VDD = 2.5V 2
-6
VREF = 2V, AD8038 CC 1.47pF VREF = 2V, AD8038 CC 1pF VREF = 0.15V, AD8038 CC 1pF VREF = 0.15V, AD8038 CC 1.47pF VREF = 3.51V, AD8038 CC 1.8pF 100k 1M FREQUENCY (Hz) 10M 100M
04463-0-015
1
10
100
1k
10k
100k
1m
10m
100m
FREQUENCY (Hz)
04463-0-038
0
-9 10k
Figure 13. Supply Current vs. Update Rate
Figure 16. Reference Multiplying Bandwidth vs. Frequency and Compensation Capacitor
Rev. 0 | Page 9 of 24
04463-0-014
6 0 -6 -12 -18 -24 -30 -36 -42 -48 -54 -60 -66 -72 -78 -84 -90 -96 -102
TA = 25C LOADING ZS TO FS
ALL ON DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
ALL OFF
TA = 25C VDD = 5V VREF = 3.5V INPUT CCOMP = 1.8pF AD8038 AMPLIFIER AD5405 DAC
AD5405
0.045 0.040 0.035 VDD = 5V
-60
7FF TO 800H
TA = 25C VREF = 0V AD8038 AMPLIFIER CCOMP = 1.8pF
-65
TA = 25C VDD = 3V VREF = 3.5V p-p
OUTPUT VOLTAGE (V)
0.030 VDD = 3V
0.020 0.015 800 TO 7FFH 0.010 0.005 0 -0.005 0 20 40 60 80 100 120 140 160 180 200
04463-0-039
THD + N (dB)
0.025
-70
-75
VDD = 3V
-80
-85
1
10
100
1k
10k
100k
1M
TIME (ns)
FREQUENCY (Hz)
Figure 17. Midscale Transition, VREF = 0 V
Figure 20. THD and Noise vs. Frequency
-1.68 7FF TO 800H -1.69 VDD = 5V -1.70 TA = 25C VREF = 3.5V AD8038 AMPLIFIER CCOMP = 1.8pF
100 MCLK = 1MHz 80
OUTPUT VOLTAGE (V)
-1.71 -1.72 -1.73 -1.74 -1.75 -1.76 800 TO 7FFH
04463-0-040
SFDR (dB)
60
MCLK = 200kHz MCLK = 0.5MHz
VDD = 3V VDD = 5V VDD = 3V
40
20
TA = 25C VREF = 3.5V AD8038 AMPLIFIER AD5405 0 20 40 60 80 100 120 140 160 180 200
04463-0-027
-1.77 0 20 40 60 80 100 120 140 160 180 200 TIME (ns)
0
fOUT (kHz)
Figure 18. Midscale Transition, VREF = 3.5 V
Figure 21. Wideband SFDR vs. fOUT Frequency
20 0 -20
TA = 25C VDD = 3V AMP = AD8038
90 80 MCLK = 5MHz 70 60 MCLK = 10MHz
PSRR (dB)
-40
SFDR (dB)
FULL SCALE
-60 -80 -100
50 40 30 20 10 TA = 25C VREF = 3.5V AD8038 AMPLIFIER AD5405 0 100 200 300 400 500 600 700 800 900 1000
04463-0-028
MCLK = 25MHz
ZERO SCALE
-120
04463-0-026
1
10
100
1k
10k
100k
1M
10M
0
FREQUENCY (Hz)
fOUT (kHz)
Figure 19. Power Supply Rejection vs. Frequency
Figure 22. Wideband SFDR vs. fOUT Frequency
Rev. 0 | Page 10 of 24
04463-0-041
-0.010
VDD = 5V
-90
AD5405
0 -10 -20 -30
SFDR (dB)
TA = 25C VDD = 5V AMP = AD8038 AD5405 65k CODES
0 -10 -20 -30 -40
SFDR (dB)
TA 25C = VDD = 3V AMP = AD8038 AD5405 65k CODES
-40 -50 -60 -70 -80
04463-0-018
-50 -60 -70 -80 -90
-90
0 2 4 6 8 FREQUENCY (MHz) 10 12
-100 250
300
350
400
450 500 550 600 FREQUENCY (MHz)
650
700
750
Figure 23. Wideband SFDR, fOUT = 100 kHz, Clock = 25 MHz
Figure 26. Narrow-Band Spectral Response, fOUT = 500 kHz, Clock = 25 MHz
0 -10 -20 -30
SFDR (dB)
TA 25C = VDD = 5V AMP = AD8038 AD5405 65k CODES
20 0 -20
TA 25C = VDD = 3V AMP = AD8038 AD5405 65k CODES
SFDR (dB)
-40 -50 -60 -70 -80
-40 -60 -80
-100
-90
04463-0-019
-100
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 FREQUENCY (MHz) 4.0 4.5 5.0
-120 50
60
70
80
90 100 110 120 FREQUENCY (MHz)
130
140
150
Figure 24. Wideband SFDR, fOUT =500 kHz, Clock = 10 MHz
Figure 27. Narrow-Band SFDR, fOUT = 100 kHz, Clock = 25 MHz
0
0
TA = 25C VDD = 5V AMP = AD8038 AD5405 65k CODES
-10
-20
-10 -20 -30
TA 25C = VDD = 3V AMP = AD8038 AD5405 65k CODES
-30
SFDR (dB)
-40
(dB)
-40
-50 -60 -70 -80 -90
-50
-60
-70
-80
04463-0-020
-90
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 FREQUENCY (MHz) 4.0 4.5 5.0
-100 70 75 80 85 95 90 100 105 FREQUENCY (MHz) 110 115 120
Figure 25. Wideband SFDR, fOUT = 50 kHz, Clock = 10 MHz
Figure 28. Narrow-Band IMD, fOUT = 90 kHz, 100 kHz, Clock = 10 MHz
Rev. 0 | Page 11 of 24
04463-0-023
04463-0-022
04463-0-021
AD5405
0 -10 -20 -30 -40 TA 25C = VDD = 5V AMP = AD8038 AD5405 65k CODES
300 ZERO SCALE LOADED TO DAC 250 MIDSCALE LOADED TO DAC FULL SCALE LOADED TO DAC
TA = 25C AMP = AD8038
OUTPUT NOISE (nV/ Hz)
200
(dB)
-50 -60 -70 -80 -90
04463-0-024
150
100
50
04463-0-025
-100 0 50 100 150 200 250 FREQUENCY (kHz) 300 350 400
0 100
1k
10k FREQUENCY (Hz)
100k
Figure 29. Wideband IMD, fOUT = 90 kHz, 100 kHz, Clock = 25 MHz
Figure 30. Output Noise Spectral Density
Rev. 0 | Page 12 of 24
AD5405 TERMINOLOGY
Relative Accuracy Relative accuracy or endpoint nonlinearity is a measure of the maximum deviation from a straight line passing through the endpoints of the DAC transfer function. It is measured after adjusting for zero and full scale and is normally expressed in LSBs or as a percentage of full-scale reading. Differential Nonlinearity Differential nonlinearity is the difference between the measured change and the ideal 1 LSB change between any two adjacent codes. A specified differential nonlinearity of 1 LSB max over the operating temperature range ensures monotonicity. Gain Error Gain error or full-scale error is a measure of the output error between an ideal DAC and the actual device output. For this DAC, ideal maximum output is VREF - 1 LSB. Gain error of the DACs is adjustable to zero with external resistance. Output Leakage Current Output leakage current is current that flows in the DAC ladder switches when these are turned off. For the IOUT1 terminal, it can be measured by loading all 0s to the DAC and measuring the IOUT1 current. Minimum current flows in the IOUT2 line when the DAC is loaded with all 1s. Output Capacitance Capacitance from IOUT1 or IOUT2 to AGND. Output Current Settling Time This is the amount of time it takes for the output to settle to a specified level for a full-scale input change. For this device, it is specified with a 100 resistor to ground. Digital to Analog Glitch lmpulse The amount of charge injected from the digital inputs to the analog output when the inputs change state. This is typically specified as the area of the glitch in either pA-secs or nV-secs depending upon whether the glitch is measured as a current or voltage signal. Digital Feedthrough When the device is not selected, high frequency logic activity on the device' s digital inputs is capacitively coupled through the device to show up as noise on the IOUT pins and subsequently into the following circuitry. This noise is digital feedthrough. Multiplying Feedthrough Error This is the error due to capacitive feedthrough from the DAC reference input to the DAC IOUT1 terminal, when all 0s are loaded to the DAC. Digital Crosstalk This is the glitch impulse transferred to the outputs of one DAC in response to a full-scale code change (all 0s to all 1s, and vice versa) in the input register of the other DAC. It is expressed in nV-s. Analog Crosstalk This is the glitch impulse transferred to the output of one DAC due to a change in the output of another DAC. It is measured by loading one of the input registers with a full-scale code change (all 0s to all 1s, and vice versa), while keeping LDAC high. Then pulse LDAC low and monitor the output of the DAC whose digital code was not changed. The area of the glitch is expressed in nV-s. Channel to Channel Isolation This refers to the proportion of input signal from one DAC's reference input which appears at the output of the other DAC, and is expressed in dBs. Total Harmonic Distortion (THD) The DAC is driven by an ac reference. The ratio of the rms sum of the harmonics of the DAC output to the fundamental value is the THD. Usually only the lower-order harmonics are included, such as the second to the fifth.
THD = 20 log
(V2 2 + V32 + V4 2 + V52 )
V1
Intermodulation Distortion The DAC is driven by two combined sine wave references of frequencies fa and fb. Distortion products are produced at sum and difference frequencies of mfa nfb where m, n = 0, 1, 2, 3,... Intermodulation terms are those for which m or n is not equal to zero. The second-order terms include (fa + fb) and (fa - fb) and the third-order terms are (2fa + fb), (2fa - fb), (f + 2fa + 2fb) and (fa - 2fb). IMD is defined as
IMD = 20 log
(rms sum of the sum and diff distortion products)
rms amplitude of the fundamental
Compliance Voltage Range The maximum range of (output) terminal voltage for which the device provides the specified characteristics.
Rev. 0 | Page 13 of 24
AD5405 GENERAL DESCRIPTION
DAC SECTION
The AD5405 is a 12-bit, dual-channel, current-output DAC consisting of a standard inverting R-2R ladder configuration. Figure 31 shows a simplified diagram for a single channel of the AD5405. The feedback resistor RFB has a value of 2R. The value of R is typically 10 k (minimum 8 k and maximum 12 k). If IOUT1A and IOUT2A are kept at the same potential, a constant current flows in each ladder leg, regardless of digital input code. Thus, the input resistance presented at VREF is always constant.
VREF A R 2R S1 R 2R S2 2R S3 R 2R S12 2R 2R RFB A IOUT1A DAC DATA LATCHES AND DRIVERS
04463-0-005
With a fixed 10 V reference, the circuit shown in Figure 32 gives a unipolar 0 V to -10 V output voltage swing. When VIN is an ac signal, the circuit performs 2-quadrant multiplication. Table 5 shows the relationship between digital code and expected output voltage for unipolar operation.
Table 5. Unipolar Code Table
Digital Input 1111 1111 1000 0000 0000 0001 0000 0000 Analog Output (V) -VREF (4095/4096) -VREF (2048/4096) = -VREF/2 -VREF (1/4096) -VREF (0/4096) = 0
Bipolar Operation
In some applications, it may be necessary to generate full 4-quadrant multiplying operation or a bipolar output swing. This can be easily accomplished by using another external amplifier, as shown in Figure 33.
VDD R1A R1 2R R2A VIN R2 2R R2_3A IOUT1A RFB 2R RFBA C1
IOUT 2A
Figure 31. Simplified Ladder Configuration
Access is provided to the VREF, RFB, IOUT1, and IOUT2 terminals of each DAC, making the device extremely versatile and allowing it to be configured in several different operating modes, such as for unipolar output, bipolar output, or single-supply mode.
AD5405
12-Bit DAC A R
IOUT2A
A1 VOUT = -VIN TO +VIN
CIRCUIT OPERATION
A1 R3A
R3 2R
Unipolar Mode
Using a single op amp, this DAC can easily be configured to provide 2-quadrant multiplying operation or a unipolar output voltage swing, as shown in Figure 32.
VDD R1A R1 2R R2A R2 2R R2_3A R3 2R RFB 2R RFBA C1
VREFA AGND GND
AGND
AGND NOTES 1. SIMILAR CONFIGURATION FOR DAC B 2. C1 PHASE COMPENSATION (1pF-2pF) MAY BE REQUIRED IF A1 IS A HIGH SPEED AMPLIFIER.
Figure 33. Bipolar Operation (4-Quadrant Multiplication)
When in bipolar mode, the output voltage is given by
A1 VOUT = 0V TO -VIN
AD5405
12-Bit DAC A R
IOUT1A IOUT2A
VOUT = VREF x D 2n -1 x VREF
where D is the fractional representation of the digital word loaded to the DAC, in the range of 0 to 4095, and n is the number of bits. When VIN is an ac signal, the circuit performs 4-quadrant multiplication.
04463-0-006
R3A AGND
AGND VREFA GND
AGND NOTES 1. SIMILAR CONFIGURATION FOR DAC B 2. C1 PHASE COMPENSATION (1pF-2pF) MAY BE REQUIRED IF A1 IS A HIGH SPEED AMPLIFIER.
Table 6 shows the relationship between the digital code and the expected output voltage for bipolar operation.
Table 6. Bipolar Code Table
Digital Input 1111 1111 1000 0000 0000 0001 0000 0000 Analog Output (V) +VREF (2047/2048) 0 -VREF (2047/2048) -VREF (2048/2048)
Figure 32. Unipolar Operation
When an output amplifier is connected in unipolar mode, the output voltage is given by
VOUT = - D 2n x VREF
where D is the fractional representation of the digital word loaded to the DAC, and n is the resolution of the DAC.
D = 0 to 4095
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AD5405
Stability
In the I-to-V configuration, the IOUT of the DAC and the inverting node of the op amp must be connected as close as possible, and proper PCB layout techniques must be employed. Because every code change corresponds to a step function, gain peaking may occur if the op amp has limited GBP and there is excessive parasitic capacitance at the inverting node. This parasitic capacitance introduces a pole into the open loop response which can cause ringing or instability in the closedloop applications circuit. An optional compensation capacitor, C1, can be added in parallel with RFB for stability, as shown in Figure 32 and Figure 33. Too small a value of C1 can produce ringing at the output, while too large a value can adversely affect the settling time. C1 should be found empirically, but 1 pF to 2 pF is generally adequate for the compensation.
POSITIVE OUTPUT VOLTAGE
Note that the output voltage polarity is opposite to the VREF polarity for dc reference voltages. In order to achieve a positive voltage output, an applied negative reference to the input of the DAC is preferred over the output inversion through an inverting amplifier because of the resistor's tolerance errors. To generate a negative reference, the reference can be level shifted by an op amp such that the VOUT and GND pins of the reference become the virtual ground and -2.5 V respectively, as shown in Figure 35.
VDD = +5V ADR03 VOUT VIN GND +5V VDD -2.5V 1/2 AD8552
-5V
C1 RFB IOUT1 IOUT2 GND 1/2 AD8552
VREF
12-BIT DAC
VOUT = 0V TO +2.5V
SINGLE-SUPPLY APPLICATIONS
Voltage Switching Mode of Operation
Figure 34 shows these DACs operating in the voltage switching mode. The reference voltage, VIN, is applied to the IOUT1 pin, IOUT2 is connected to AGND, and the output voltage is available at the VREF terminal. In this configuration, a positive reference voltage results in a positive output voltage, making singlesupply operation possible. The output from the DAC is voltage at a constant impedance (the DAC ladder resistance). Thus an op amp is necessary to buffer the output voltage. The reference input no longer sees a constant input impedance, but one that varies with code. So, the voltage input should be driven from a low impedance source.
VDD R1 R2
Figure 35. Positive Voltage Output with Minimum Components
ADDING GAIN
In applications where the output voltage is required to be greater than VIN, gain can be added with an additional external amplifier or it can also be achieved in a single stage. Consider the effect of temperature coefficients of the thin film resistors of the DAC. Simply placing a resistor in series with the RFB resistor causes mismatches in the temperature coefficients resulting in larger gain temperature coefficient errors. Instead, the circuit of Figure 36 is a recommended method of increasing the gain of the circuit. R1, R2, and R3 should all have similar temperature coefficients, but they need not match the temperature coefficients of the DAC. This approach is recommended in circuits where gains of > 1 are required.
VDD
VIN
RFB IOUT1 IOUT2
VDD VREF GND VOUT
C1
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NOTES 1. SIMILAR CONFIGURATION FOR DAC B 2. C1 PHASE COMPENSATION (1pF-2pF) MAY BE REQUIRED IF A1 IS A HIGH SPEED AMPLIFIER.
VDD
RFB IOUT1 IOUT2 R3 VOUT
VIN
R2
VREF
12-BIT DAC GND
Figure 34. Single-Supply Voltage Switching Mode
R2
GAIN = R2 + R3 R2
04463-0-011
Note that VIN is limited to low voltages because the switches in the DAC ladder no longer have the same source-drain drive voltage. As a result, their on resistance differs and degrades the integral linearity of the DAC. Also, VIN must not go negative by more than 0.3 V or an internal diode turns on, exceeding the max ratings of the device. In this type of application, the full range of multiplying capability of the DAC is lost.
R1 = R2R3 NOTES R2 + R3 1. SIMILAR CONFIGURATION FOR DAC B 2. C1 PHASE COMPENSATION (1pF-2pF) MAY BE REQUIRED IF A1 IS A HIGH SPEED AMPLIFIER.
Figure 36. Increasing Gain of Current Output DAC
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NOTES 1. SIMILAR CONFIGURATION FOR DAC B 2. C1 PHASE COMPENSATION (1pF-2pF) MAY BE REQUIRED IF A1 IS A HIGH SPEED AMPLIFIER.
AD5405
USED AS A DIVIDER OR PROGRAMMABLE GAIN ELEMENT
Used as a divider or programmable gain element, currentsteering DACs are very flexible and lend themselves to many different applications. If this type of DAC is connected as the feedback element of an op amp, and RFB is used as the input resistor, as shown in Figure 37, then the output voltage is inversely proportional to the digital input fraction D. For D = 1-2n the output voltage is
REFERENCE SELECTION
When selecting a reference for use with the AD5405 series of current output DACs, pay attention to the reference output voltage temperature coefficient specification. This parameter not only affects the full-scale error, but can also affect the linearity (INL and DNL) performance. The reference temperature coefficient should be consistent with the system accuracy specifications. For example, an 8-bit system required to hold its overall specification to within 1 LSB over the temperature range 0C to 50C dictates that the maximum system drift with temperature should be less than 78 ppm/C. A 12-bit system with the same temperature range to overall specification within 2 LSBs requires a maximum drift of 10 ppm/C. By choosing a precision reference with low output temperature coefficient, this error source can be minimized. Table 7 lists some references available from Analog Devices that are suitable for use with this range of current output DACs.
VOUT = - VIN D = - VIN (1 - 2 -n )
VDD VIN RFB IOUT1 IOUT2 GND VDD VREF
AMPLIFIER SELECTION
The primary requirement for the current-steering mode is an amplifier with low input bias currents and low input offset voltage. The input offset voltage of an op amp is multiplied by the variable gain (due to the code-dependent output resistance of the DAC) of the circuit. A change in this noise gain between two adjacent digital fractions produces a step change in the output voltage due to the amplifier's input offset voltage. This output voltage change is superimposed upon the desired change in output between the two codes and gives rise to a differential linearity error, which, if large enough, could cause the DAC to be nonmonotonic. The input bias current of an op amp also generates an offset at the voltage output as a result of the bias current flowing in the feedback resistor RFB. Most op amps have input bias currents low enough to prevent any significant errors in 12-bit applications. Common-mode rejection of the op amp is important in voltage-switching circuits, because it produces a codedependent error at the voltage output of the circuit. Most op amps have adequate common-mode rejection for use at 12-bit resolution. Provided the DAC switches are driven from true wide band, low impedance sources (VIN and AGND) they settle quickly. Consequently, the slew rate and settling time of a voltageswitching DAC circuit is determined largely by the output op amp. To obtain minimum settling time in this configuration, minimize capacitance at the VREF node (voltage output node in this application) of the DAC. This is done by using low input capacitance buffer amplifiers and careful board design. Most single-supply circuits include ground as part of the analog signal range, which in turn requires an amplifier that can handle rail-to-rail signals. Analog Devices offers a large range of singlesupply amplifiers, as listed in Table 8.
VOUT
04463-0-012
NOTE ADDITIONAL PINS OMITTED FOR CLARITY
Figure 37. Current-Steering DAC Used as a Divider or Programmable Gain Element
As D is reduced, the output voltage increases. For small values of the digital fraction D, it is important to ensure that the amplifier does not saturate and also that the required accuracy is met. For example, an 8-bit DAC driven with the binary code 0 x 10 (00010000), that is, 16 decimal, in the circuit of Figure 37 should cause the output voltage to be 16 x VIN. However, if the DAC has a linearity specification of 0.5 LSB, then D can, in fact, have the weight anywhere in the range 15.5/256 to 16.5/256 so that the possible output voltage is in the range 15.5 VIN to 16.5 VIN--an error of 3% even though the DAC itself has a maximum error of 0.2%. DAC leakage current is also a potential error source in divider circuits. The leakage current must be counterbalanced by an opposite current supplied from the op amp through the DAC. Because only a fraction D of the current into the VREF terminal is routed to the IOUT1 terminal, the output voltage has to change as follows:
Output Error Voltage Due to DAC Leakage = (Leakage x R)/D
where R is the DAC resistance at the VREF terminal. For a DAC leakage current of 10 nA, R = 10 k and a gain (that is, 1/D) of 16, the error voltage is 1.6 mV.
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AD5405
Table 7. Suitable ADI Precision References Recommended for Use with AD5405 DACs
Reference ADR01 ADR02 ADR03 ADR425 Output Voltage 10 V 5V 2.5 V 5V Initial Tolerance 0.1% 0.1% 0.2% 0.04% Temperature Drift 3 ppm/C 3 ppm/C 3 ppm/C 3 ppm/C 0.1 Hz to 10 Hz noise 20 V p-p 10 V p-p 10 V p-p 3.4 V p-p Package SC70, TSOT, SOIC SC70, TSOT, SOIC SC70, TSOT, SOIC MSOP, SOIC
Table 8. Precision ADI Op Amps Suitable for Use with AD5405 DACs
Part No. OP97 OP1177 AD8551 Max Supply Voltage V 20 18 +6 VOS (max) V 25 60 5 IB (max) nA 0.1 2 0.05 GBP MHz 0.9 1.3 1.5 Slew Rate V/s 0.2 0.7 0.4
Table 9. High Speed ADI Op Amps Suitable for Use with AD5405 DACs
Part No. AD8065 AD8021 AD8038 Max Supply Voltage V 12 12 5 VOS (max) V 1500 1000 3000 IB (max) nA 0.01 1000 0.75 BW @ ACL MHz 145 200 350 Slew Rate V/s 180 100 425
PARALLEL INTERFACE
Data is loaded to the AD5405 in the format of a 12-bit parallel word. Control lines CS and R/W allow data to be written to or read from the DAC register. A write event takes place when CS and R/W are brought low, data available on the data lines fills the shift register, and the rising edge of CS latches the data and transfers the latched data word to the DAC register. The DAC latches are not transparent, thus a write sequence must consist of a falling and rising edge on CS to ensure data is loaded to the DAC register and its analog equivalent reflected on the DAC output. A read event takes place when R/W is held high and CS is brought low. Data is loaded from the DAC register back to the input register and out onto the data line where it can be read back to the controller for verification or diagnostic purposes. The input and DAC registers of these devices are not transparent, so a falling and rising edge of CS is required to load each data-word.
A0 TO AX ADDRESS BUS
AD54xx*
MICRO/DSP*
ADDRESS DECODER A DAC A/B CS
A+1 WR
WR DB0 TO DB11
DB0 TO DB11
DATA BUS
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 38. AD54xx to Parallel Interface
PCB LAYOUT AND POWER SUPPLY DECOUPLING
In any circuit where accuracy is important, careful consideration of the power supply and ground return layout helps to ensure the rated performance. The printed circuit board on which the AD5405 is mounted should be designed so that the analog and digital sections are separated, and confined to certain areas of the board. If the DAC is in a system where multiple devices require an AGND-to-DGND connection, the connection should be made at one point only. The star ground point should be established as close as possible to the device.
MICROPROCESSOR INTERFACING
The AD5405 can be interfaced to a variety of 16-bit microcontrollers or DSP processors. Figure 38 shows the AD5405 DAC interfaced to a generic 16-bit microcontroller/DSP processor. Microprocessor interfacing to this family of DAC is via a data bus that uses a standard protocol compatible with microcontrollers and DSP processors. The address decoder selects DAC A or DAC B and also to loads parallel data to the input latch or to read data from the DAC using an AND gate.
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04462-0-055
AD5405
These DACs should have ample supply bypassing of 10 F in parallel with 0.1 F on the supply located as close to the package as possible, ideally right up against the device. The 0.1 F capacitor should have low effective series resistance (ESR) and effective series inductance (ESI), like the common ceramic types that provide a low impedance path to ground at high frequencies, to handle transient currents due to internal logic switching. Low ESR 1 F to 10 F tantalum or electrolytic capacitors should also be applied at the supplies to minimize transient disturbance and filter out low frequency ripple. Fast switching signals such as clocks should be shielded with digital ground to avoid radiating noise to other parts of the board, and should never be run near the reference inputs. Avoid crossover of digital and analog signals. Traces on opposite sides of the board should run at right angles to each other. This reduces the effects of feedthrough on the board. A microstrip technique is by far the best, but not always possible with a double-sided board. In this technique, the component side of the board is dedicated to the ground plane while signal traces are placed on the soldered side. It is good practice to employ compact, minimum lead length PCB layout design. Leads to the input should be as short as possible to minimize IR drops and stray inductance. The PCB metal traces between VREF and RFB should also be matched to minimize gain error. To maximize high frequency performance, the I-to-V amplifier should be located as close to the device as possible.
EVALUATION BOARD FOR THE DACS
The evaluation board consists of a DAC and a current-tovoltage amplifier, the AD8065. Included on the evaluation board is a 10 V reference, the ADR01. An external reference may also be applied via an SMB input. The evaluation kit consists of a CD-ROM with self-installing PC software to control the DAC. The software simply allows the user to write a code to the device.
POWER SUPPLIES FOR THE EVALUATION BOARD
The board requires 12 V and 5 V supplies. The 12 V VDD and VSS are used to power the output amplifier, while the 5 V is used to power the DAC (VDD1) and transceivers (VCC). Both supplies are decoupled to their respective ground plane with 10 F tantalum and 0.1 F ceramic capacitors.
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AD5405
Figure 39. Schematic of AD5405 Evaluation Board
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AD5405
Figure 40. Component-Side Artwork
Figure 41. Silkscreen--Component-Side View (Top Layer)
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04463-0-046
AD5405
Figure 42. Solder-Side Artwork
Rev. 0 | Page 21 of 24
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AD5405 OVERVIEW OF AD54xx DEVICES
Table 10.
Part No. AD5424 AD5426 AD5428 AD5429 AD5450 AD5432 AD5433 AD5439 AD5440 AD5451 AD5443 AD5444 AD5415 AD5445 AD5447 AD5449 AD5452 AD5446 AD5453 AD5553 AD5556 AD5555 AD5557 AD5543 AD5546 AD5545 AD5547 Resolution 8 8 8 8 8 10 10 10 10 10 12 12 12 12 12 12 12 14 14 14 14 14 14 16 16 16 16 No. DACs 1 1 2 2 1 1 1 2 2 1 1 1 2 2 2 2 1 1 1 1 1 2 2 1 1 2 2 INL(LSB) 0.25 0.25 0.25 0.25 0.25 0.5 0.5 0.5 0.5 0.25 1 0.5 1 1 1 1 0.5 1 2 1 1 1 1 2 2 2 2 Interface Parallel Serial Parallel Serial Serial Serial Parallel Serial Parallel Serial Serial Serial Serial Parallel Parallel Serial Serial Serial Serial Serial Parallel Serial Parallel Serial Parallel Serial Parallel Package RU-16, CP-20 RM-10 RU-20 RU-10 RJ-8 RM-10 RU-20, CP-20 RU-16 RU-24 RJ-8 RM-10 RM-8 RU-24 RU-20, CP-20 RU-24 RU-16 RJ-8, RM-8 RM-8 UJ-8, RM-8 RM-8 RU-28 RM-8 RU-38 RM-8 RU-28 RU-16 RU-38 Features 10 MHz BW, 17 ns CS Pulse Width 10 MHz BW, 50 MHz Serial 10 MHz BW, 17 ns CS Pulse Width 10 MHz BW, 50 MHz Serial 10 MHz BW, 50 MHz Serial 10 MHz BW, 50 MHz Serial 10 MHz BW, 17 ns CS Pulse Width 10 MHz BW, 50 MHz Serial 10 MHz BW, 17 ns CS Pulse Width 10 MHz BW, 50 MHz Serial 10 MHz BW, 50 MHz Serial 10 MHz BW, 50 MHz Serial 10 MHz BW, 58 MHz Serial 10 MHz BW, 17 ns CS Pulse Width 10 MHz BW, 17 ns CS Pulse Width 10 MHz BW, 50 MHz Serial 10 MHz BW, 50 MHz Serial 10 MHz BW, 50 MHz Serial 10 MHz BW, 50 MHz Serial 4 MHz BW, 50 MHz Serial Clock 4 MHz BW, 20 ns WR Pulse Width 4 MHz BW, 50 MHz Serial Clock 4 MHz BW, 20 ns WR Pulse Width 4 MHz BW, 50 MHz Serial Clock 4 MHz BW, 20 ns WR Pulse Width 4 MHz BW, 50 MHz Serial Clock 4 MHz BW, 20 ns WR Pulse Width
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AD5405 OUTLINE DIMENSIONS
6.00 BSC SQ 0.60 MAX
31 30 40 1
0.60 MAX PIN 1 INDICATOR
PIN 1 INDICATOR
TOP VIEW
5.75 BCS SQ
0.50 BSC 0.50 0.40 0.30
EXPOSED PAD
(BOTTO M VIEW)
4.25 4.10 SQ 3.95
10 11
21 20
0.25 MIN 4.50 REF
126 MAX
0.80 MAX 0.65 TYP 0.05 MAX 0.02 NOM
1.00 0.85 0.80
SEATING PLANE
0.30 0.23 0.18
0.20 REF
COPLANARITY 0.08
COMPLIANT TO JEDEC STANDARDS MO-220-VJJD-2
Figure 43. 40 Lead LFCSP (CP-40) Dimensions shown in inches and (mm)
ORDERING GUIDE
Model AD5405YCP AD5405YCP-REEL AD5405YCP-REEL7 EVAL-AD5405EB Resolution 12 12 12 INL (LSBs) 1 1 1 Temperature Range -40C to +125C -40C to +125C -40C to +125C Package Description LFCSP LFCSP LFCSP Evaluation Kit Package Option CP-40 CP-40 CP-40
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AD5405 NOTES
(c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04463-0-7/04(0)
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