AD829SQ/883B

高速，低噪声视频运算放大器 High-Speed, Low-Noise Video Op Amp

Product Details

The AD829 is a low noise 1.7 nV/√Hz, high speed op amp with custom compensation that provides the user with gains of 1 to 20 while maintaining a bandwidth >50 MHz. Its 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 while requiring only 5 mA of current from power supplies.

The external compensation pin of the AD829 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-2 line driver, the −3 dB bandwidth can be increased to 95 MHz at the expense of 1 dB of peaking. Its output can also be clamped at its external compensation pin. The AD829 exhibits excellent dc performance. It offers a minimum open-loop gain of 30 V/mV into loads as low as 500 Ω, a 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.

This op amp is also useful in multichannel, high speed data conversion where its fast 90 ns to 0.1% settling time is important. In such applications, the AD829 serves as an input buffer for 8-bit to 10-bit ADCs and as an output I/V converter for high speed DACs.

Operating as a traditional voltage feedback amplifier, the AD829 provides many of the advantages that a transimpedance amplifier offer. A bandwidth >50 MHz can be maintained for a range of gains through the replacement of 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 amplifiers. The inputs of the AD829 are symmetrical.

### Features and Benefits

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High Speed

120 MHz bandwidth, gain = −1

230 V/μs slew rate

90 ns settling time to 0.1%

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Ideal for video applications

0.02% differential gain

0.04° differential phase

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Low noise

1.7 nV/√Hz input voltage noise

1.5 pA/√Hz input current noise

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Excellent dc precision

1 mV maximum input offset voltage over temperature

0.3 μV/°C input offset drift

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Flexible operation

Specified for ±5 V to ±15 V operation

±3 V output swing into a 150 Ω load

External compensation for gains 1 to 20

5 mA supply current

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Available in tape and reel in accordance with EIA-481A standard