Dual 260 MHz a Gain = +2.0 & +2.2 Buffer AD8079 FEATURES FUNCTIONAL BLOCK DIAGRAM Factory Set Gain 8-Pin Plastic SOIC AD8079A: Gain = +2.0 (Also +1.0 & 1.0) AD8079B: Gain = +2.2 (Also +1 & 1.2) +IN1 1 8 OUT1 Gain of 2.2 Compensates for System Gain Loss Minimizes External Components GND 2 +V 7 S Tight Control of Gain and Gain Matching (0.1%) AD8079 GND 3 6 V Optimum Dual Pinout S Simplifies PCB Layout +IN2 4 5 OUT2 Low Crosstalk of 70 dB 5 MHz Excellent Video Specifications (R = 150 V) L Gain Flatness 0.1 dB to 50 MHz 0.01% Differential Gain Error cables and transformers. Its low distortion and fast settling are 0.028 Differential Phase Error ideal for buffering high speed dual or differential A-to-D con- Low Power of 50 mW/Amplifier (5 mA) verters. High Speed and Fast Settling The AD8079 features a unique transimpedance linearization 260 MHz, 3 dB Bandwidth circuitry. This allows it to drive video loads with excellent differ- 750 V/ms Slew Rate (2 V Step), 800 V/ms (4 V Step) ential gain and phase performance of 0.01% and 0.02 on only 40 ns Settling Time to 0.1% (2 V Step) 50 mW of power per amplifier. It features gain flatness of 0.1 dB Low Distortion of 65 dBc THD, f = 5 MHz C to 50 MHz. This makes the AD8079 ideal for professional video High Output Drive of Over 70 mA electronics such as cameras and video switchers. Drives Up to 8 Back-Terminated 75 V Loads (4 Loads/ The AD8079 offers low power of 5 mA/amplifier (V = 5 V) S Side) While Maintaining Good Differential Gain/ and can run on a single +12 V power supply while delivering Phase Performance (0.01%/0.178) over 70 mA of load current. All of this is offered in a small 8-pin High ESD Tolerance (5 kV) SOIC package. These features make this amplifier ideal for por- Available in Small 8-Pin SOIC table and battery powered applications where size and power are APPLICATIONS critical. Differential A-to-D Driver The outstanding bandwidth of 260 MHz along with 800 V/s of Video Line Driver slew rate make the AD8079 useful in many general purpose high Differential Line Driver speed applications where dual power supplies of 3 V to 6 V Professional Cameras are required. Video Switchers The AD8079 is available in the industrial temperature range of Special Effects 40C to +85C. RF Receivers 1 PRODUCT DESCRIPTION The AD8079 is a dual, low power, high speed buffer designed 0 to operate on 5 V supplies. The AD8079s pinout offers excel- R = 100 L SIDE 2 1 V = 50mV rms lent input and output isolation compared to the traditional dual SIDE 1 IN 2 amplifier pin configuration. With two ac ground pins separating 0.1 3 both the inputs and outputs, the AD8079 achieves very low crosstalk of less than 70 dB at 5 MHz. 0 4 Additionally, the AD8079 contains gain setting resistors factory 0.1 5 set at G = +2.0 (A grade) or Gain = +2.2 (B grade) allowing 0.2 6 SIDE 2 circuit configurations with minimal external components. The 50 SIDE 1 0.3 7 50 B grade gain of +2.2 compensates for gain loss through a system 0.4 8 by providing a single-point trim. Using active laser trimming of these resistors, the AD8079 guarantees tight control of gain and 0.5 9 1M 10M 100M 1G channel-channel gain matching. With its performance and con- FREQUENCY Hz figuration, the AD8079 is well suited for driving differential Figure 1. Frequency Response and Flatness REV. A 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: ( T = +258C, V = 65 V, R = 100 V, unless otherwise noted) AD8079SPECIFICATIONS A S L AD8079A/AD8079B Parameter Conditions Min Typ Max Units DYNAMIC PERFORMANCE 3 dB Small Signal Bandwidth V = 50 mV rms 260 MHz IN Bandwidth for 0.1 dB Flatness V = 50 mV rms 50 MHz IN Large Signal Bandwidth V = 1 V rms 100 MHz IN Slew Rate V = 2 V Step 750 V/s O V = 4 V Step 800 V/s O Settling Time to 0.1% V = 2 V Step 40 ns O Rise & Fall Time V = 2 V Step 2.5 ns O NOISE/HARMONIC PERFORMANCE Total Harmonic Distortion f = 5 MHz, V = 2 V p-p 65 dBc C O Crosstalk, Output to Output f = 5 MHz 70 dB Input Voltage Noise f = 10 kHz 2.0 nV/Hz Input Current Noise f = 10 kHz, +In 2.0 pA/Hz = 150 0.01 % Differential Gain Error NTSC, R L NTSC, R = 75 0.01 % L Differential Phase Error NTSC, R = 150 0.02 Degree L R = 75 0.07 Degree L DC PERFORMANCE Offset Voltage, RTO 10 15 mV T T 10 20 mV MIN MAX Offset Drift, RTO 20 V/C +Input Bias Current 3.0 6.0 A T T 10 A MIN MAX Gain No Load 1.998/2.198 2.0/2.2 2.002/2.202 V/V R = 150 1.995/2.195 2.0/2.2 2.005/2.205 V/V L Gain Matching Channel-to-Channel, No Load 0.1 % Channel-to-Channel, R = 150 0.5 % L INPUT CHARACTERISTICS +Input Resistance +Input 10 M +Input Capacitance +Input 1.5 pF OUTPUT CHARACTERISTICS Output Voltage Swing R = 150 2.7 3.1 V L R = 75 2.8 V L 1 70 mA Output Current 1 Short Circuit Current 85 110 mA POWER SUPPLY Operating Range 3.0 6.0 V Quiescent Current/Both Amplifiers T T 10.0 11.5 mA MIN MAX Power Supply Rejection Ratio, RTO +V = +4 V to +6 V, V = 5 V 49 69 dB S S V = 4 V to 6 V, +V = +5 V 40 50 dB S S +Input Current T T 0.1 0.5 A/V MIN MAX NOTES 1 Output current is limited by the maximum power dissipation in the package. See the power derating curves. Specifications subject to change without notice. 2 REV. A