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HS574A/SP674A 12-Bit Sampling A/D Converters
s Complete 12-bit A/D Converters with Sample- s s s
Hold, Reference, Clock and Tri-state Outputs Low Power Dissipation -- 110mW Maximum 12-Bit Linearity Over Temperature Fast Conversion time: 25s Max (HS574A) 15s Max (SP674A) Monolithic Construction
s
DESCRIPTION...
The HS574A/SP674A Series are complete 12-bit successive-approximation A/D converters integrated on a single die with tri-state output latches, an internal reference, clock and a sample- hold. They feature 12-bit linearity over temperature, low power dissipation and fast conversion time. They are available in commercial and military temperature ranges.
STS 28
DB11 27
DB10 26
DB9 25
DB8 24
DB7 23
DB6 22
DB5 21
DB4 20
DB3 19
DB2 18
DB1 17
DB0 16
DGND 15
NIBBLE A
NIBBLE B THREE-STATE BUFFERS AND CONTROL
NIBBLE C
12-BIT SAR
OSC
COMP
12-BIT CAPACITANCE DAC OFFSET/GAIN TRIM
CONTROL LOGIC
REF 7.5K 15K 7.5K 7.5K 12 13 14 15K
N/C 1 2 3 4 5 6 7 8 9 10 11
VLOGIC
12/8
CS
A0
R/C
CE
VCC
REF OUT
AGND
REF IN
VEE
BIP OFF
10V IN
20V IN
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ABSOLUTE MAXIMUM RATINGS
VCC to Digital Common .................................................. 0 to +16.5V VLOGIC to Digital Common ................................................... 0 to +7V Analog Common to Digital Common ......................................... 1V Control Inputs to Digital Common ................. -0.5V to VLOGIC +0.5V (CE, CS, A0, 12/8, R/C) Analog Inputs to Analog Common ...................................... 16.5V (REF IN, BIP OFF, 10VIN) 20VIN to Analog Common ........................................................ 24V REF OUT ............................................... Indefinite short to common Momentary short to VCC Power Dissipation ............................................................. 1000mW Lead Temperature, Soldering ................................... 300C, 10Sec J/C ................................................................................... 45C/W MTBF-25C Ground Base ................................ 2.915 million hours MTBF-125C Missile Launch ...................... 10.16 thousand hours
*
CAUTION: ESD (ElectroStatic Discharge) sensitive device. Permanent damage may occur on unconnected devices subject to high energy electrostatic fields. Unused devices must be stored in conductive foam or shunts. Personnel should be properly grounded prior to handling this device. The protective foam should be discharged to the destination socket before devices are removed.
Inputs exceeding +30% or -30% of FS will cause erratic performance.
SPECIFICATIONS
(Typical @ 25C with VCC = +15V, VEE = 0V, VLOGIC = +5V unless otherwise noted)
PARAMETER MIN. TYP. MAX. UNIT CONDITIONS RESOLUTION All models 12 Bits ANALOG INPUTS Input Ranges Bipolar 5, 10 V Unipolar 0 to +10, 0 to +20 V Input Impedance 10 Volt Input 3.75 6.25 K 20 Volt Input 15 25 K DIGITAL INPUTS Logic Inputs CE, CS R/C, AO, 12/8 Logic 1 +2.4 +5.5 V Logic 0 -0.3 +0.8 V Current 0.1 50 A 0V to +5.5V Input Capacitance 5 pF 12/8 Control Input Hardwire to VLOGIC or DIGITAL COMMON (SP574A only) DIGITAL OUTPUTS Logic Outputs DB11-DB0, STS Logic 1 +2.4 V ISOURCE 500A Logic 0 +0.4 V ISINK 1.6mA Leakage (High Z State) 40 A Data bits only Capacitance 5 pF Parallel Data Output Codes Unipolar Positive true binary Bipolar Positive true offset binary REFERENCE Internal 10.00 0.1 V Output Current 2 mA Note 1 CONVERSION TIME HS574A 12-Bit Conversion 13 25 s 8-Bit Conversion 10 19 s SP674A 12-Bit Conversion 9 15 s 8-Bit Conversion 6 11.25 s
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SPECIFICATIONS (continued)
(Typical @ 25C with VCC = +15V, VEE = 0V, VLOGIC = +5V unless otherwise noted) PARAMETER MIN. TYP. MAX. UNIT ACCURACY Linearity Error @ 25C -J, -S 1.0 LSB -K, -L, -T, -U 0.5 LSB Differential Linearity Error -J, -S 11 Bits 11 Bits -K, -L, -T, -U 12 Bits 12 Bits Offset Unipolar 2 LSB Bipolar -J, -S 10 LSB -K, -L, -T, -U 4 LSB Full Scale (Gain) Error 0.3 %FS -J 0.5 %FS 0.22 %FS -K 0.4 %FS 0.12 %FS -L 0.35 %FS 0.05 %FS -S 0.8 %FS 0.5 %FS -T 0.6 %FS 0.25 %FS -U 0.4 %FS 0.12 %FS STABILITY Unipolar Offset -J 10 ppm/C -K, -L, -S 5 ppm/C -T, -U 2.5 ppm/C Bipolar Offset -J, -S 10 ppm/C -K, -L, -T 5 ppm/C -U 2.5 ppm/C Gain (Scale Factor) -J, -S 50 ppm/C -K, -T 25 ppm/C -L, -U 10 ppm/C PSRR VLOGIC 0.5 LSB VCC -J, -S 2 LSB -K, -L, -T, -U 1 LSB POWER REQUIREMENTS +4.5 +5.5 V VLOGIC ILOGIC HS574A 1 3 mA SP674A 1 3 mA VCC +11.4 +16.5 V ICC HS574A 7 9 mA SP674A 7 9 mA CONDITIONS
@ 25C and TMIN to TMAX @ 25C and TMIN to TMAX Note 2 @ 25C TMIN to TMAX @ 25C TMIN to TMAX Note3
% of full scale; TMIN to TMAX Note 4 No adjustment @ 25C With adjustment @ 25C No adjustment @ 25C With adjustment @ 25C No adjustment @ 25C With adjustment @ 25C No adjustment @ 25C With adjustment @ 25C No adjustment @ 25C With adjustment @ 25C No adjustment @ 25C With adjustment @ 25C
TMIN to TMAX TMIN to TMAX TMIN to TMAX TMIN to TMAX TMIN to TMAX TMIN to TMAX TMIN to TMAX TMIN to TMAX TMIN to TMAX +4.5V VLOGIC +5.5V Note 5
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SPECIFICATIONS (continued)
(Typical @ 25C with VCC = +15V, VEE = 0V, VLOGIC = +5V unless otherwise noted) PARAMETER Power Dissipation HS574A SP674A ENVIRONMENTAL Operating Temperature Range -J, -K, -L -S, -T, -U Storage Temperature Range -J, -K, -L -A, -S, -T, -U MIN. TYP. 110 110 MAX. 150 150 UNIT mW mW CONDITIONS
0 -55 -40 -65
+70 +125 +85 +150
C C C C
Notes: 1. Available for external loads. External load should not change during conversion. When supplying an external load and operating on a +12V supply, a buffer amplifier must be provided for the reference output. 2. Minimum resolution for which no missing codes are guaranteed. 3. Externally adjustable to zero. See Calibration information. 4. Fixed 50 resistor between REF OUT and REF IN. 5. +13.5V VCC +16.5V or +11.4V VCC +12.6V. 6. Specifications are identical for all models unless otherwise noted.
PIN ASSIGNMENTS...
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 FUNCTION VLOGIC 12/8 CS A0 R/C CE VCC REF OUT ANA GND(AC) REF IN N/C* BIP OFF 10VIN PIN 28 27 26 25 24 23 22 21 20 19 18 17 16 FUNCTION STS DB11(MSB) DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0(LSB)
14 20VIN 15 DIG. GND *HS574A - This pin is not connected to the device; it can be tied to -15V, ground, or left floating. *SP674A - This pin is not connected to the device; VEE is generated internally.
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FEATURES... The HS574A/SP674A feature standard bipolar and unipolar input ranges of 10V and 20V. Input ranges are controlled by a bipolar offset pin and laser-trimmed for specified linearity, gain and offset accuracy. Power requirements are +5V and +12V to +15V with a maximum dissipation of 150mW at the specified voltages. Conversion times of 8s, 10s, 15s and 25s are available, as are units with 10, 25 or 50ppm/C temperature coefficients for flexible matching to specific application requirements. The HS574A/SP674A are available in six product grades for each conversion time. The -J, -K and -L models are specified over 0C to + 70C commercial temperature range; the -S, -T and - U models are specified over the -55C to +125C military temperature range. Processing in accordance with MIL-STD-883C is also available. The HS574A/SP674A are packaged in a 28-pin CerDIP. Please consult the factory for other packaging options. CIRCUIT OPERATION... The HS574A/SP674A are complete 12-bit analog-to-digital converters with integral voltage reference, comparator, successive-approximation register (SAR), sample-and-hold, clock, output buffers and control circuitry. The high level of integration of the HS574A/SP674A means they require few external components. When the control section of the HS574A/SP674A initiates a conversion command, the clock is enabled and the successive-approximation register is reset to all zeros. Once the conversion cycle begins, it can not be stopped or re-started and data is not available from the output buffers. The SAR, timed by the clock, sequences through the conversion cycle and returns an end-of- convert flag to the control section of the ADC. The clock is then disabled by the control section, the output status goes low, and the control section is enabled to allow the data to be read by external command. The internal HS574A/SP674A 12-bit CDAC is sequenced by the SAR starting from the MSB to
the LSB at the beginning of the conversion cycle to provide an output voltage from the CDAC that is equal to the input signal voltage (which is divided by the input voltage divider network). The comparator determines whether the addition of each successively-weighted bit voltage causes the CDAC output voltage summation to be greater or less than the input voltage; if the sum is less, the bit is left on; if more, the bit is turned off. After testing all the bits, the SAR contains a 12- bit binary code which accurately represents the input signal to within 12 LSB. The internal reference provides the voltage reference to the CDAC with excellent stability over temperature and time. The reference is trimmed to 10.00 Volts 1% and can supply up to 2mA to an external load in addition to that required to drive the reference input resistor (1mA) and offset resistor (1mA) when operating with 15V supplies. If the HS574A/SP674A is used with 12V supplies, or if external current must be supplied over the full temperature range, an external buffer amplifier is recommended. Any external load on the HS574A/SP674A reference must remain constant during conversion. The sample and hold is a default function by virtue of the CDAC architecture. Therefore the majority of the S/H specifications are included within the A/D specifications. Sample-and-Hold Function Although there is no sample-and-hold circuit in the classical sense, the sampling nature of the capacitive DAC makes the HS574A/SP674A appear to have a built in sample and hold. This sample and hold action substantially increases the usefulness of the HS574A/SP674A over that of similar competing devices. Note that even though the user may use an external sample and hold for very high frequency inputs, the internal sample and hold still provides a very useful isolation function. Once the internal sample is taken by the CDAC capacitance, the input of the HS574A/SP674A is disconnected from the input. This prevents transients occurring during conversion from being inflicted upon the attached buffer. All other 574/ 674 circuits will cause a transient load current on
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CE
VERROR = t dv dt SAMPLE POINT VERROR t
R/C
t(ACQ) ACQUISITION TIME
WAIT FOR CONVERT SIGNAL VIN CDAC VOLTAGE 0 VOLTS
CONVERSION
WAIT FOR BUS READ
ACQUISITION TIME = APERTURE DELAY TIME = 0.12 x tCONVERT
Figure 1. Aperture Uncertainty
Figure 3. Sample-and-Hold Function
the input which will upset the buffer output and may add error to the conversion itself. Furthermore, the isolation of the input after the acquisition time in the HS574A/SP674A allows the user an opportunity to release the hold on an external sample-and-hold and start it tracking the next sample. This will increase system throughput with the user's existing components. When using an external S/H, the HS574A/ SP674A acts as any other 574-type device because the internal S/H is transparent. The sample/ hold function in the HS574A/SP674A is inherent to the capacitor DAC structure, and its timing characteristics are determined by the internally generated clock. However, for multiplexer operation, the internal S/H may eliminate the need for an external S/H. The operation of the S/H function is internal to the HS574A/SP674A and is controlled through the normal R/C control line (refer to Figure 3). When the R/C line makes a negative transition, the HS574A/SP674A starts the timing of the sampling and conversion. The first two clock cycles are allocated to signal
acquisition of the input by the CDAC (this time is defined as tACQ). Following these two cycles, the input sample is taken and held. The A/D conversion follows this cycle with the duration controlled by the internal clock cycle, which is determined by the specific product model. Note that because the sample is taken relative to the R/C transition, tACQ is also the traditional "aperture delay" of this internal sample and hold. Since tACQ is measured in clock cycles, its duration will vary with the internal clock frequency. This results in TACQ = 2.9 sec 1.1secs between units and over temperatures. Offset, gain and linearity errors of the S/H circuit, as well as the effects of its droop rate, are included in the overall specs for the HS574A/ SP674A. USING THE SPX74A SERIES Typical Interface Circuit The HS574A/SP674A is a complete A/D converter that is fully operational when powered up and issued a Start Convert Signal. Only a few external components are necessary. Figure 4 depicts a typical interface circuit for operating the HS574A/SP674A in a unipolar input mode. Figure 5 depicts a typical interface circuit for operating the HS574A/SP674A in a bipolar input mode. Further information is given in the following sections on these connections, but first a few considerations concerning board layout to achieve the best operation. For each application of this device, strict attention must be given to power supply decoupling, board layout (to reduce pickup between analog
25pF
REQ = 4K at any range. T = REQ x CEQ = 100ns.
Figure 2. Equivalent SP574A Input Circuit
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OUTPUT BITS MSB 2 3 4 5 6 12-BITS OSCILLATOR R1 100K -15V +15V 0 TO 10V 10V IN 13 100K ANALOG INPUTS 20V IN 14 12-BITS SAMPLE/HOLD MSB STROBE CDAC LSB COMP 15 12-BIT SAR 28 1 STS VLOGIC 1F DGND +5V CONTROL LOGIC NIBBLE A NIBBLE B NIBBLE C 27 26 25 24 23 22 21 20 19 18 17 16 LSB
12/8 CS A0 R/C CE
THREE-STATE BUFFERS AND CONTROL
BIP 0 TO 20V OFF 12 100
VREF OUT
8
REF REF AMP
OFFSET/GAIN TRIM NETWORK
R2 100 10 VREF IN VCC 7 1F +15V AGND 9 NO CONNNECTION PERMITTED 11
Figure 4. Unipolar Input Connections
and digital sections), and grounding. Digital timing, calibration and the analog signal source must be considered for correct operation. To achieve specified accuracy, a double-sided printed circuit board with a copper ground plane
on the component side is recommended. Keep analog signal traces away from digital lines. It is best to lay the PC board out such that there is an analog section and a digital section with a single point ground connection between the two through an RF bead. If this is not possible, run analog
OUTPUT BITS MSB 2 3 4 5 6 12-BITS OSCILLATOR 12-BIT SAR 28 1 12-BITS SAMPLE/HOLD MSB STROBE CDAC LSB COMP 15 STS VLOGIC 1F DGND +5V CONTROL LOGIC NIBBLE A NIBBLE B NIBBLE C 27 26 25 24 23 22 21 20 19 18 17 16 LSB
12/8 CS A0 R/C CE
THREE-STATE BUFFERS AND CONTROL
5V ANALOG INPUTS 10V
10V IN 13 20V IN 14 BIP OFF 12
100 R1 VREF OUT 8 REF REF AMP OFFSET/GAIN TRIM NETWORK
100 R2 VREF IN
10
VCC 7 1F +15V AGND 9
11
NO CONNECTION PERMITTED
Figure 5. Bipolar Input Connections
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signals between ground traces and cross digital lines at right angles only. Grounding Considerations Any ground path from the analog and digital ground should be as low resistance as possible to accommodate the ground currents present with this device. The analog ground current is approximately 6mA DC while the digital ground is 3mA DC. The analog and digital common pins should be tied together as close to the package as possible to guarantee best performance. The code-dependent currents flow through the VLOGIC and VCC terminals and not through the analog and digital common pins. Power Supplies The supply voltages for the SPx74A must be kept as quiet as possible from noise pickup and also regulated from transients or drops. Because the part has 12-bit accuracy, voltage spikes on the supply lines can cause several LSB deviations on the output. Switching power supply noise can be a problem. Careful filtering and shielding should be employed to prevent the noise from being picked up by the converter. Capacitor bypass pairs are needed from each supply pin to its respective ground to filter noise and counter the problems caused by the variations in supply current. A 10F tantalum and a 0.1F ceramic type in parallel between VLOGIC (pin 1) and digital common (pin15), and VCC (pin
7) and analog common (pin 9) is sufficient. VEE is generated internally so pin 11 may be grounded or connected to a negative supply if the SPx74A is being used to upgrade an already existing design. CALIBRATION AND CONNECTION PROCEDURES Unipolar The calibration procedure consists of adjusting the converter's most negative output to its ideal value for offset adjustment, and then adjusting the most positive output to its ideal value for gain adjustment. Starting with offset adjustment and referring to Figure 4, the midpoint of the first LSB increment should be positioned at the origin to get an output code of all 0s. To do this, an input of +12 LSB or +1.22mV for the 10V range and +2.44mV for the 20V range should be applied to the SPx74A. Adjust the offset potentiometer R1 for code transition flickers between 0000 0000 0000 and 0000 0000 0001. The gain adjustment should be done at positive full scale. The ideal input corresponding to the last code change is applied. This is 112LSB below the nominal full scale which is +9.9963V for the 10V range and +19.9927V for the 20V range. Adjust the gain potentiometer R2 for flicker between codes 1111 1111 1110 and 1111 1111 1111. If calibration is not necessary for the intended application, replace R2 with a 50, 1% metal film resistor and remove the network ana-
NIBBLE B ZERO OVERRIDE NIBBLE A, B INPUT BUFFERS 12/8 CS A0 R/C CE EOC8 CK Q D Q A0 LATCH EOC12 H DQ CK R READ CONTROL NIBBLE C
DELAY
STS
Figure 6. SPx74A Control Logic
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log input to pin 13 for the 0V to 10V range or to pin 14 for the 0V to 20V range. Bipolar The gain and offset errors listed in the specifications may be adjusted to zero using the potentiometers R1 and R2 (See Figure 5). If adjustment is not needed, either or both pots may be replaced by a 50, 1% metal film resistor. To calibrate, connect the analog input signal to pin 13 for a 5V range or to pin 14 for a 10V range. First apply a DC input voltage 12 LSB above negative full scale which is -4.9988V for the 5V range or -9.9976V for the 10V range. Adjust the offset potentiometer R1 for flicker between output codes 0000 0000 0000 and 0000 0000 0001. Next, apply a DC input voltage 112 LSB below positive full scale which is +4.9963V for the 5 range or +9.9927V for the 10V range. Adjust the gain potentiometer R2 for flicker between codes 1111 1111 1110 and 1111 1111 1111. Alternative The 100 potentiometer R2 provides gain adjust for 10V and 20V ranges. In some applications, a full scale of 10.24V (for and LSB of 2.5mV) or 20.48 (for an LSB of 5.0mV) is more convenient. For these, replace R2 by a 50, 1% metal film resistor. Then to provide gain adjust for the 10.24 range, add a 200 potentiometer and a 95 fixed resistor, all in series with pin 13. For the 20.48V range, add a 500 potentiometer and a 200 fixed resistor in series with pin 14.
of these inputs in controlling the converter's operation is shown in Table 1, and the internal control logic is shown in a simplified schematic in Figure 6. Conversion Start A conversion may be initiated by a logic transition on any of the three inputs: CE, CS R/C, as shown in Table 1. The last of the three to reach the correct state starts the conversion, so one, two or all three may be dynamically controlled. The nominal delay from each is the same and all three may change state simultaneously. In order to assure that a particular input controls the start of conversion, the other two should be setup at least 50ns earlier. Refer to the convert mode timing specifications. The Convert Mode timing diagram is shown in Figure 8. The output signal STS is the status flag and goes high only when a conversion is in progress. While STS is high, the output buffers remain in a high impedance state so that data can not be read. Also, when STS is high, an additional Start Convert will not reset the converter or reinitiate a conversion. Note, if A0 changes state after a conversion begins, an additional Start Convert command will latch the new state of A0 and possibly cause a wrong cycle length for that conversion (8-versus 12-bits).
CE CS R/C 12/8 A0 0 x x 1 0 0 x x 0 0 0 0 0 0 0 0 0 1 1 1 x x x x x x x x 1 0 0 x x 0 1 0 1 0 1 x 0 1 None None Initiate 12-Bit Conversion Initiate 8-Bit Conversion Initiate 12-Bit Conversion Initiate 8-Bit Conversion Initiate 12-Bit Conversion Initiate 8-Bit Conversion Enable 12-Bit Output Enable 8 MSB's Only Enable 4 LSB's plus 4 Trailing Zeroes OPERATION
CONTROLLING THE SPx74A The SPx74A can be operated by most microprocessor systems due to the control input pins and on-chip logic. It may also be operated in the "stand-alone" mode and enabled by the R/C input pin. Full microprocessor control consists of selecting an 8- or 12-bit conversion cycle, initiating the conversion, and reading the output data when ready. The output read has the options of choosing either 12-bits at once or 8-bits followed by 4-bits in a left-justified format. All five control inputs are TTL/CMOS compatible and include 12/8, CS, A0, R/C and CE. The use
1 1 1 1 1 1 1
Table 1. SPx74A Control Input Truth Table
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Conversion Length A conversion start transition latches the state of A0 as shown in Figure 8 and Table 1. The latched state determines if the conversion stops with 8- bits (A0 high) or continues for 12-bits (A0 low). If all 12-bits are read following an 8-bit conversion, the three LSB's will be a logic "0" and DB3 will be a logic "1". A0 is latched because it is also involved in enabling the output buffers as explained elsewhere. No other control inputs are latched. Stand-Alone Operation The simplest interface is a control line connected to R/C. The other controls must be tied to known states as follows: CE and 12/8 are wired high, A0 and CS are wired low. The output data arrives in words of 12-bits each. The limits on R/C duty cycle are shown in Figures 9 and 10. The duty cycle may be within and including the extremes shown in the specifications. In general, data may be read when R/C is high unless STS is also high, indicating a conversion is in progress. Reading Output Data The output data buffers remain in a high impedance state until the following four conditions are met: R/C is high, STS is low, CE is high and CS is low. The data lines become active in response to these four conditions, and output data according to the conditions of the control lines 12/8 and A0. The timing diagram for this process is shown in Figure 11. When 12/8 is high, all 12 data outputs become active simultaneously and the A0 input is ignored. The 12/8 input is usually tied high or low; it is TTL/CMOS compatible. When 12/8 is low, the output is separated into two 8-bit bytes as shown below: BYTE 1 xxxx xxxx MSB BYTE2 xxxx 0000 LSB
4 through 7 are forced to a zero and the four LSB's are enabled. The two byte format is "left justified data" as shown above and can be considered to have a decimal point or binary to the left of byte 1. A0 may be toggled without damage to the converter at any time. Break-before-make action is guaranteed between the two data bytes. This assures that the outputs which are strapped together in Figure 11 will never be enabled at the same time. In Figure 11, it can be seen that a read operation usually begins after the conversion is complete and STS is low. If earlier access is needed, the read can begin no later than the addition of times tDD and tHS before STS goes low.
A0
ADDRESS BUS
STS 2 4 A0 12/8 DB11 (MSB)
28 27 26 25 24 23
DATA BUS
SPx74A
22 21 20 19 18
This configuration makes it easy to connect to an 8-bit address bus as shown in Figure 7. The A0 control can be connected to the least significant bit of the data bus in order to store the output data into two consecutive memory locations. When A0 is pulled low, the 8 MSB's are enabled only. When A0 is high, the 8 MSB's are disabled, bits
17 16 15
DB0 (LSB) DIG COM
Figure 7. Interfacing SPx74A to 8-Bit Interface Bus
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CONVERT MODE TIMING
CE CS tSSC
tHEC
R/C
tSRC tHRC
A0 tSAC tHAC STS tDSC tC
DB11- DB0
HIGH IMPEDANCE
CHARACTERISTICS
Typical @ 25C, VCC = +15V or +10V, VLOGIC = +5V, VEE = 0V, unless otherwise specified. PARAMETER tDSC STS Delay from CE tHEC CE Pulse Width tSSC CS to CE Setup tHSC CS Low during CE High tSRC R/C to CE Setup tHRC R/C Low during CE High tSAC A0 to CE Setup tHAC A0 Valid during CE High tC
NOTES: 1. 2. 3. 4.
MIN. 50 50 50 50 50 0 50
TYP.
MAX. 200
UNITS ns ns ns ns ns ns ns ns
CONDITIONS
Conversion Time1, 3, 4
See specifications
Parameters guaranteed by design and sample tested. Parameters 100% tested @ 25C on special orders. 100% tested. TMIN to TMAX.
Figure 8. Convert Mode Timing
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STAND-ALONE MODE TIMING CHARACTERISTICS
Typical @ 25C, VCC= +15V or +12V, VLOGIC = +5V, VEE =0V, unless otherwise specified. PARAMETER tHRL Low R/C Pulse Width 2 tDS tHS STS Delay from R/C 2 25 300 150 150 1000 STS Delay After Data Valid 2 tHDR Data Valid After R/C Low 2 tHRH High R/C Pulse Width tDDR Data Access Time
NOTES: 1. Parameters guaranteed by design and sample tested. 2. Parameters 100% tested @ 25C on special orders.
MIN. 50
TYP.
MAX. 200
UNITS ns ns ns ns ns ns
CONDITIONS
R/C
tHRL
tDS STS tHDR tHS DB11-DB0
DATA VALID DATA VALID
tC
Figure 9. Low Pulse for R/C -- Outputs Enabled After Conversion
R/C tHRH STS tDDR
HIGH-Z
tDS tC tHDR
HIGH-Z
DB11-DB0
DATA VALID
Figure 10. High Pulse For R/C -- Outputs Enabled While R/C is High, Otherwise High Impedance
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READ MODE TIMING
CE CS tSSR tHSR tHRR tSRR
R/C
A0 tSAR STS tHD DB11- DB0
HIGH IMPEDANCE DATA VALID
tHAR
tDD
tHL
CHARACTERISTICS
Typical @ 25C, VCC = +15V or +12V, VLOGIC = +5V, VEE = 0V, unless otherwise specified. PARAMETER Access Time From CE2 Data Valid After CE Low2 Output Float Delay2 50 0 50 0 0 50 300 1000 0 50 0 0 MIN. 25 150 TYP. MAX. 150 UNITS ns ns ns ns ns ns ns ns ns ns CONDITIONS
tDD tHD tHL
tSSR CS to CE Setup tSRR R/C to CE Setup tSAR A0 to CE Setup tHSR CS Valid After CE Low tHRR R/C High After CE Low tHAR A0 Valid After CE Low tHS STS Delay After Data Valid
NOTES: 1. Parameters guaranteed by design and sample tested. 2. Parameters 100% tested @ 25C on special orders.
Figure 11. Read Mode Timing
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ORDERING INFORMATION
Model .................... No Missing Codes to; ... Linearity ...................... Gain TC ......................... Temperature Range ............ Package Type 25s Conversion Time HS574AA .............. 11 Bits .............................. 1.0 LSB ...................... 50ppm/C .............. -40C to +85C ............ 28-pin, 0.6" Ceramic DIP HS574AB .............. 12 Bits .............................. 0.5 LSB ...................... 27ppm/C .............. -40C to +85C ............ 28-pin, 0.6" Ceramic DIP HS574AC .............. 12 Bits .............................. 0.5 LSB ...................... 10ppm/C .............. -40C to +85C ............ 28-pin, 0.6" Ceramic DIP HS574AJ ............... 11 Bits .............................. 1.0 LSB ...................... 50ppm/C .............. 0C to +70C ................ 28-pin, 0.6" Ceramic DIP HS574AK .............. 12 Bits .............................. 0.5 LSB ...................... 27ppm/C .............. 0C to +70C ................ 28-pin, 0.6" Ceramic DIP HS574AL .............. 12 Bits .............................. 0.5 LSB ...................... 10ppm/C .............. 0C to +70C ................ 28-pin, 0.6" Ceramic DIP HS574AS .............. 11 Bits .............................. 1.0 LSB ...................... 50ppm/C .............. -55C to +125C .......... 28-pin, 0.6" Ceramic DIP HS574AT .............. 12 Bits .............................. 0.5 LSB ...................... 25ppm/C .............. -55C to +125C .......... 28-pin, 0.6" Ceramic DIP HS574AU .............. 12 Bits .............................. 0.5 LSB ...................... 12.5ppm/C ........... -55C to +125C .......... 28-pin, 0.6" Ceramic DIP HS574AS/883* ...... 11 Bits .............................. 1.0 LSB ...................... 50ppm/C .............. -55C to +125C .......... 28-pin, 0.6" Ceramic DIP HS574AT/883* ...... 12 Bits .............................. 0.5 LSB ...................... 25ppm/C .............. -55C to +125C .......... 28-pin, 0.6" Ceramic DIP HS574AU/883* ..... 12 Bits .............................. 0.5 LSB ...................... 12.5ppm/C ........... -55C to +125C .......... 28-pin, 0.6" Ceramic DIP 15s Conversion Time SP674AA .............. 11 Bits .............................. 1.0 SP674AB .............. 12 Bits .............................. 0.5 SP674AC .............. 12 Bits .............................. 0.5 SP674AJ ............... 11 Bits .............................. 1.0 SP674AK .............. 12 Bits .............................. 0.5 SP674AL ............... 12 Bits .............................. 0.5 SP674AS .............. 11 Bits .............................. 1.0 SP674AT ............... 12 Bits .............................. 0.5 SP674AU .............. 12 Bits .............................. 0.5 SP674AS/883* ...... 11 Bits .............................. 1.0 SP674AT/883* ...... 12 Bits .............................. 0.5 SP674AU/883* ...... 12 Bits .............................. 0.5 * MIL-STD-883C processing. NOTE: Electrical specifications for -AA, -AB and -AC grades are the same as -AJ, -AK, and -AL models respectively, with the exception of extended operating temperature range performance from -40C to +85C. Please consult the factory for other packaging options. LSB ...................... 50ppm/C .............. LSB ...................... 27ppm/C .............. LSB ...................... 10ppm/C .............. LSB ...................... 50ppm/C .............. LSB ...................... 27ppm/C .............. LSB ...................... 10ppm/C .............. LSB ...................... 50ppm/C .............. LSB ...................... 25ppm/C .............. LSB ...................... 12.5ppm/C ........... LSB ...................... 50ppm/C .............. LSB ...................... 25ppm/C .............. LSB ...................... 12.5ppm/C ........... -40C to +85C ............ -40C to +85C ............ -40C to +85C ............ 0C to +70C ................ 0C to +70C ................ 0C to +70C ................ -55C to +125C .......... -55C to +125C .......... -55C to +125C .......... -55C to +125C .......... -55C to +125C .......... -55C to +125C .......... 28-pin, 28-pin, 28-pin, 28-pin, 28-pin, 28-pin, 28-pin, 28-pin, 28-pin, 28-pin, 28-pin, 28-pin, 0.6" 0.6" 0.6" 0.6" 0.6" 0.6" 0.6" 0.6" 0.6" 0.6" 0.6" 0.6" Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic DIP DIP DIP DIP DIP DIP DIP DIP DIP DIP DIP DIP
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