The AD829’s external compensation pin gives it exceptional versatility. For example, compensation can be selected to optimize the bandwidth for a given load and power supply voltage. As a gain-of-two line driver, the –3 dB bandwidth can be increased to 95 MHz at the expense of 1 dB of peaking. In addition, the AD829’s output can also be clamped at its external compensation pin. The AD829 has excellent dc performance. It offers a minimum open-loop gain of 30 V/mV into loads as low as 500 Ω, low input voltage noise of 1.7 nV/√Hz, and a low input offset voltage of 1 mV maximum. Common-mode rejection and power supply rejection ratios are both 120 dB. The AD829 is also useful in multichannel, high speed data conversion where its fast (90 ns to 0.1%) settling time is of importance. In such applications, the AD829 serves as an input buffer for 8-to-10-bit A/D converters and as an output I/V converter for high speed D/A converters. REV. C 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
20-Pin LCC Pinout
18 17 16 15 14 NC 19 OFFSET 20 NULL NC 1
TOP VIEW (Not to Scale)
12 C COMP
OFFSET NULL NC
The AD829 is a low noise (1.7 nV/√Hz), high speed op amp with custom compensation that provides the user with gains from ± 1 to ± 20 while maintaining a bandwidth greater than 50 MHz. The AD829’s 0.04° differential phase and 0.02% differential gain performance at 3.58 MHz and 4.43 MHz, driving reverse-terminated 50 Ω or 75 Ω cables, makes it ideally suited for professional video applications. The AD829 achieves its 230 V/µs uncompensated slew rate and 750 MHz gain bandwidth product while requiring only 5 mA of current from the power supplies.
8-Pin Plastic Mini-DIP (N), Cerdip (Q) and SOIC (R) Packages
FEATURES High Speed 120 MHz Bandwidth, Gain = –1 230 V/s Slew Rate 90 ns Settling Time to 0.1% Ideal for Video Applications 0.02% Differential Gain 0.04؇ Differential Phase Low Noise 1.7 nV/√Hz Input Voltage Noise 1.5 pA/√Hz Input Current Noise Excellent DC Precision 1 mV max Input Offset Voltage (Over Temp) 0.3 V/؇C Input Offset Drift Flexible Operation Specified for ؎5 V to ؎15 V Operation ؎3 V Output Swing into a 150 ⍀ Load External Compensation for Gains 1 to 20 5 mA Supply Current Available in Tape and Reel in Accordance with EIA-481A Standard
High Speed, Low Noise Video Op Amp AD829
NC = NO CONNECT
The AD829 provides many of the same advantages that a transimpedance amplifier offers, while operating as a traditional voltage feedback amplifier. A bandwidth greater than 50 MHz can be maintained for a range of gains by changing the external compensation capacitor. The AD829 and the transimpedance amplifier are both unity gain stable and provide similar voltage noise performance (1.7 nV/√Hz). However, the current noise of the AD829 (1.5 pA/√Hz) is less than 10% of the noise of transimpedance amps. Furthermore, the inputs of the AD829 are symmetrical. PRODUCT HIGHLIGHTS
1. Input voltage noise of 2 nV/√Hz, current noise of 1.5 pA/ √Hz and 50 MHz bandwidth, for gains of 1 to 20, make the AD829 an ideal preamp. 2. Differential phase error of 0.04° and a 0.02% differential gain error, at the 3.58 MHz NTSC and 4.43 MHz PAL and SECAM color subcarrier frequencies, make it an outstanding video performer for driving reverse-terminated 50 Ω and 75 Ω cables to ± 1 V (at their terminated end). 3. The AD829 can drive heavy capacitive loads. 4. Performance is fully specified for operation from ± 5 V to ± 15 V supplies. 5. Available in plastic, cerdip, and small outline packages. Chips and MIL-STD-883B parts are also available. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703