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19-4904; Rev 1; 12/10
TION KIT EVALUA BLE AVAILA
3V Video Amplifier with Internal Gain and Filter in SC70
Features
S 5.2V/V Internal Gain S 2-Pole Reconstruction Filter S Input Range Includes Ground S DC-Coupled Inputs and Outputs S Rail-to-Rail Output S 3.7mA Low Quiescent Current S 0.4A Shutdown Current
General Description
The MAX9680 high-speed amplifier and filter is optimized for portable video applications. It is specifically designed to be compatible with the video encoders embedded in application processors with 0.4VP-P video output. The input common-mode range includes GND, which allows a video DAC (digital-to-analog converter) to be DC-coupled to the MAX9680. The output swings within 2mV of GND and 20mV to VDD with a standard back-terminated video load (150I). An internal level shift circuit prevents the output from saturating with 0V input, thus preventing sync-pulse clipping in common video circuits. Therefore, the MAX9680 is ideally suited for DC-coupling to the video load. The MAX9680 has been optimized for space-sensitive applications by integrating internal gain setting resistors (G = 5.2V/V) and a 2-pole video-DAC reconstruction filter. In shutdown mode, the quiescent current is reduced to less than 0.4FA, dramatically reducing power consumption and prolonging battery life. The MAX9680 is available in the tiny 2mm x 2.1mm, 6-pin, SC70 package.
MAX9680
Ordering Information
PART TEMP RANGE PINPACKAGE 6 SC70 TOP MARK ADT
MAX9680AXT+T -40NC to +125NC
+Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel.
Typical Application Circuit appears at end of data sheet.
Applications
Mobile Phones Digital Still Cameras Digital Video Cameras
Block Diagram
VDD
Pin Configuration
IN RIN BUFFER LPF OUT
RSET
TOP VIEW
IN 1 GND 2 RSET 3
MAX9680
RSET
+
6 VDD MAX9680 5 ENABLE 4 OUT
ENABLE SHUTDOWN CONTROL
G = 5.2V/V
SC70
GND
_______________________________________________________________ Maxim Integrated Products 1
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3V Video Amplifier with Internal Gain and Filter in SC70 MAX9680
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDD to GND).................................-0.3V to +4V ENABLE to GND......................................................-0.3V to +4V IN to GND ................................................. -0.3V to (VDD + 0.3V) OUT to GND (ENABLE is high) ................ -0.3V to (VDD + 0.3V) OUT to GND (ENABLE is low) .............................-0.3V to +3.2V ENABLE, IN ..................................................................... Q50mA OUT ...........................................................................Continuous Electrostatic Discharge Human Body Model.......................................................2000V Charged Device Model ...................................................500V Continuous Power Dissipation (TA = +70NC) 6-Pin SC70 (derate 3.1mW/C above +70NC) .............245mW Operating Temperature Range ........................ -40NC to +125NC Junction Temperature .....................................................+150NC Storage Temperature Range............................ -65NC to +150NC Lead Temperature (soldering, 10s) ................................+300NC Soldering Temperature (reflow) ......................................+260NC
PACKAGE THERMAL CHARACTERISTICS (Note 1)
SC70 Junction-to-Ambient Thermal Resistance (qJA) .....326.5C/W Junction-to-Case Thermal Resistance (qJC) .............115C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = VENABLE = 2.8V, VGND = 0V, RL = 150I to GND. TA = -40NC to +125NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2) PARAMETER OFFSET LEVEL-SHIFT VOLTAGE Output Level-Shift Voltage Power-Supply Rejection Ratio INPUT VOLTAGE RANGE Input Voltage Range Input Resistance (In+) RSET Resistance RSET/RIN Ratio VOLTAGE GAIN DC Voltage Gain (Note 3) FREQUENCY RESPONSE f = 4.5MHz Filter Response VIN = VGND to 0.387V f = 9MHz f = 27MHz f = 54MHz Differential Gain Error Five-step modulated staircase of 127.8mV step size and 305.3mV peak-to-peak subcarrier amplitude, f = 4.43MHz Five-step modulated staircase of 127.8mV step size and 305.3mV peak-to-peak subcarrier amplitude, f = 4.43MHz -0.2 -3.5 -23 -45 0.2 % dB AV VDD = 2.7V, VIN = VGND to 0.445V VDD = 2.8V, VIN = VGND to 0.464V 5.00 5.00 5.17 5.17 5.34 5.34 V/V VCM RIN RSET VDD = 2.7V VDD = 2.8V VIN = 0.5V VRSET = 0.5V VGND VGND 732 3150 4.214 872 3750 4.3 0.445 0.464 1012 4350 4.386 V I I VOLS PSRR VIN = VGND VIN = VGND, VDD = 2.7V to 3.6V 0 120 200 250 mV FV/V SYMBOL CONDITIONS MIN TYP MAX UNITS
Differential Phase Error
0.3
degrees
2
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3V Video Amplifier with Internal Gain and Filter in SC70
ELECTRICAL CHARACTERISTICS (continued)
(VDD = VENABLE = 2.8V, VGND = 0V, RL = 150I to GND. TA = -40NC to +125NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2) PARAMETER Group Delay Variation Signal-to-Noise Ratio OUTPUT Positive Voltage Output Swing from Rail Negative Voltage Output Swing from Rail Positive Voltage Output Swing from Rail Negative Voltage Output Swing from Rail Output Leakage Output Short-Circuit Current POWER SUPPLY Supply Voltage Supply Current ENABLE/SHUTDOWN FUNCTION Disabled (Logic-Low Threshold) Enabled (Logic-High Threshold) Enable Time Disable Time Shutdown Current Disabled 0 1.3 350 200 0.4 4 0.45 VDD V V ns ns FA VDD IDD No load 2.7 3.7 3.6 9 V mA IOUT VIN = 0.7V VIN = -0.05V VIN = 0.7V, RL = 75I to GND VIN = -0.05V, RL = 75I to GND Disabled, VOUT = 2V Short to GND 90 20 1.8 35 1 2 250 5 mV mV mV mV FA mA SNR SYMBOL CONDITIONS 100kHz P f P 5.5MHz, VIN = VGND to 0.387V 100% white signal MIN TYP 15 65 MAX UNITS ns dB
MAX9680
Note 2: All devices are 100% production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design. Note 3: Voltage gain (AV) is a two-point measurement in which the output voltage swing is divided by the input voltage swing.
Typical Operating Characteristics
(VDD = VENABLE = 2.8V, VGND = 0V, RL = 150I to GND. TA = +25NC, unless otherwise noted.)
INPUT RESISTANCE vs. TEMPERATURE VIN = 0.4V
MAX9680 toc01
SET RESISTANCE vs. TEMPERATURE
MAX9680 toc02
RSET/RIN vs. TEMPERATURE
MAX9680 toc03
890 885 INPUT RESISTANCE (I) 880 875 870 865 860 -60 -40 -20 0
3900 3850 SET RESISTANCE (I) 3800 3750 3700 3650 3600
4.5 4.4 RSET/RIN (I/I) 4.3 4.2 4.1 4.0
20 40 60 80 100 120 140
-60 -40 -20 0
20 40 60 80 100 120 140
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
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3
3V Video Amplifier with Internal Gain and Filter in SC70 MAX9680
Typical Operating Characteristics (continued)
(VDD = VENABLE = 2.8V, VGND = 0V, RL = 150I to GND. TA = +25NC, unless otherwise noted.)
OUTPUT VOLTAGE vs. TEMPERATURE VIN = -50mV
MAX9680 toc04 MAX9680 toc05
GAIN vs. TEMPERATURE
5.5 5.4 5.3 5.2 5.1 5.0 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C) 5 4 OUTPUT VOLTAGE (mV) 3 2 1 0
OUTPUT VOLTAGE vs. TEMPERATURE VIN = 700mV
MAX9680 toc06
2.90 2.85 OUTPUT VOLTAGE (V) 2.80 2.75 2.70 2.65 2.60
GAIN (V/V)
-60 -40 -20 0
20 40 60 80 100 120 140
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (C)
TEMPERATURE (C)
OUTPUT VOLTAGE LEVEL SHIFT vs. TEMPERATURE VIN = VGND
MAX9680 toc07
QUIESCENT CURRENT vs. TEMPERATURE VENABLE = 2.8V
MAX9680 toc08
OUTPUT LEAKAGE CURRENT vs. TEMPERATURE ENABLE = GND, VOUT = 2V
MAX9680 toc09
0.200 OUTPUT VOLTAGE LEVEL SHIFT (V) 0.175 0.150 0.125 0.100 0.075 0.050 0.025 0 -60 -40 -20 0
9 8 QUIESCENT CURRENT (mA) 7 6 5 4 3
100 OUTPUT LEAKAGE CURRENT (nA)
10
1
0.1
0.01 -60 -40 -20 0 20 40 60 80 100 120 140 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C) TEMPERATURE (C)
20 40 60 80 100 120 140
TEMPERATURE (C)
OUTPUT LEAKAGE CURRENT vs. TEMPERATURE, ENABLE = 0
90 OUTPUT LEAKAGE CURRENT (nA) 80 70 60 50 40 30 20 10 0 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C) SHORT TO GND 0.01 0.6 SHORT TO VCC
MAX9680 toc10
SHUTDOWN QUIESCENT CURRENT HYSTERESIS vs. TEMPERATURE
MAX9680 toc11
GAIN vs. FREQUENCY
-5 -10 GAIN (dB) -15 -20 -25 -30
MAX9680 toc12
100
10
0
QUIESCENT CURRENT (mA)
1
TA = -40C
0.1 TA = +125C TA = +25C
-35 -40 1.0 100 1000 10,000 100,000
0.7
0.8
0.9
ENABLE VOLTAGE (V)
FREQUENCY (kHz)
4
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3V Video Amplifier with Internal Gain and Filter in SC70
Typical Operating Characteristics (continued)
(VDD = VENABLE = 2.8V, VGND = 0V, RL = 150I to GND. TA = +25NC, unless otherwise noted.)
MAX9680
TURN-ON TIME
MAX9680 toc13
TURN-OFF TIME
MAX9680 toc14
VCC (2V/div)
VCC (2V/div)
GND
GND
OUTPUT (1V/div) TIME (200ns/div)
OUTPUT (1V/div) GND TIME (40ns/div) GND
OUTPUT VOLTAGE vs. OUTPUT CURRENT
MAX9680 toc15
OUTPUT VOLTAGE vs. OUTPUT SINKING CURRENT
MAX9680 toc16
GROUP DELAY vs. FREQUENCY
90 80 70 60 50 40 30 20 10 0 100 1000 10,000 100,000 FREQUENCY (kHz)
MAX9680 toc17
3.0 2.5 OUTPUT VOLTAGE (V) 2.0 1.5 1.0 0.5 TA = -40C 0 0 20 40 60 80 100
3.0 2.5 OUTPUT VOLTAGE (V) TA = 0C 2.0 1.5 1.0 0.5 0 TA = -40C
100
TA = +125C TA = +85C TA = 0C AND +25C
TA = +125C TA = +85C TA = +25C
TA = -25C
120
0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
MAX9680 POWER-SUPPLY REJECTION RATIO
-10 -20 RESPONSE (dB) -30 -40 -50 -60 -70 -80 -90 -100 0.1 1
MAX9680 toc17a
DIFFERENTIAL GAIN AND PHASE f = 4.43MHz
MAX9680 toc18
DELAY (ns)
TA = -25C
DIFFERENTIAL GAIN AND PHASE f = 4.43MHz
MAX9680 toc19
0
0.03 0.02 DIFFERENTIAL GAIN (%) 0.01 0 -0.01 -0.02 -0.03 0 1 2 3 4 5
0.6 0.4 DIFFERENTIAL PHASE (deg) 0.2 0 -0.2 -0.4 -0.6 0 1 2 3 4 5
VDD = 2.8V 100mVP-P VENABLE = 2.8V RL = 150 TO GND VIN = GND
10 100 FREQUENCY (MHz)
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5
3V Video Amplifier with Internal Gain and Filter in SC70 MAX9680
Pin Description
PIN 1 2 3 4 5 6 NAME IN GND RSET OUT ENABLE VDD Input Ground Resistor Set. The reference voltage of the current digital-to-analog converter (DAC) is applied across the internal RSET resistor to generate the reference current of the DAC. Output Enable. Drive high to enable the device. Pull low to disable the device. Positive Power Supply. Bypass to GND with a 0.1FF capacitor. DESCRIPTION
Detailed Description
The MAX9680 filters and amplifies the video DAC output in applications such as mobile phones. The MAX9680 consists of two resistors, an input buffer, lowpass filter, and output amplifier capable of driving a standard 150I video load to ground. The output amplifier provides a fixed gain of 5.17V/V. The video current DAC imposes a reference voltage, VREF, across RSET. The resulting current (VREF/RSET) is the reference current for the video current DAC. The video input should be directly connected to the output of the video current DAC. RIN, the equivalent input resistance, is 872I to ground. The output current of the video DAC flows through RIN to create the video signal in the voltage domain. The filter bandwidth (-3dB) is typically 9MHz, making the device suitable for standard-definition video signals from all sources (e.g., broadcast and DVD). Broadcast video signals are channel limited: NTSC signals have 4.2MHz bandwidth, and PAL signals have 5MHz bandwidth. Video signals from a DVD player, however, are not channel limited; so the bandwidth of DVD video signals can approach the Nyquist limit of 6.75MHz. Recommendation: ITU-R BT.601-5 specifies 13.5MHz as the sampling rate
for standard-definition video. Therefore, the maximum bandwidth of the signal is 6.75MHz. To ease the filtering requirements, most modern video systems oversample by two times, clocking the video current DAC at 27MHz. The MAX9680 features 5.17V/V gain. Operating from a 2.7V to 3.6V supply, the output amplifier is able to drive a 2.3V signal into a 150I video load to ground. The output is typically offset 120mV above ground to guarantee linear operation of the amplifier. The MAX9680 output only sources current; all loads should be connected to ground. Short-Circuit Protection The MAX9680 Typical Application Circuit includes a 75I back-termination resistor that limits short-circuit currents for an external short applied at the video output. The MAX9680 features internal output short-circuit protection to prevent device damage in prototyping and applications where the amplifier output can be directly shorted. Short-circuit protection activates if the output is short circuited and the output current exceeds 90mA. During short-circuit protection, the output of the MAX9680 is shut off for 18Fs and then turns on for 0.6Fs. If the short is still present, the MAX9680 output shuts off again. Extended short circuits result in a pulsed output. The device resumes normal operation after the short is removed.
Output
RSET Resistor
Input
Video Filter
6
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3V Video Amplifier with Internal Gain and Filter in SC70
Application Information
The MAX9680 input is DC-coupled. When the supply voltage is between 2.7V and 3.6V, the input voltage range extends from ground to 0.445V. When the supply voltage is between 2.8V and 3.6V, the input voltage range extends from ground to 0.464V. A typical current-output DAC that operates from a single supply usually creates a composite video signal with a sync tip very close to ground. Hence, the DAC output can be directly connected to the MAX9680 input. Keep the board trace as short as possible to minimize parasitic stray capacitance and prevent unintentional high-frequency attenuation.
Input Considerations
The MAX9680 output must be DC-coupled. No AC-coupled capacitors are allowed. The MAX9680 connects directly to the video cable through a 75I series back-termination resistor. The other end of the cable should be properly terminated with a 75I resistor as well. Because of this configuration, the peak-to-peak amplitude as well as the DC level of the signal is divided by two. The MAX9680 output signal is level-shifted up so the sync tip is approximately 120mV. The MAX9680 operates from a single-supply voltage down to 2.7V, allowing for low-power operation. Bypass VDD to GND with a 0.1FF capacitor. Place all external components as close as possible to the device.
Output Considerations
MAX9680
Power-Supply Bypassing and Ground
Typical Application Circuit
VDD = 2.8V VIDEO ENCODER DAC IN RIN BUFFER LPF OUT 75I RSET RSET G = 5.2V/V GENERAL-PURPOSE OUTPUT ENABLE SHUTDOWN CONTROL
MAX9680
GND
Chip Information
PROCESS: BiCMOS
_______________________________________________________________________________________
7
3V Video Amplifier with Internal Gain and Filter in SC70 MAX9680
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 6 SC70 PACKAGE CODE X6SN+1 OUTLINE NO. 21-0077 LAND PATTERN NO. 90-0189
8
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3V Video Amplifier with Internal Gain and Filter in SC70
Revision History
REVISION NUMBER 0 1 REVISION DATE 9/09 12/10 Initial release Added PSRR TOC DESCRIPTION PAGES CHANGED -- 5
MAX9680
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
(c)
9
2010 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.

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