AD829 OP Amp IC Chip

AD829(High Speed, Low Noise,Video OP Amp)

Introduction

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 greater than 50 MHz.Its 0.04° differential phase and 0.02% differential gain performance at 3.58 MHz and 4.43 MHz, driving reverse-terminated 50Ω or 75Ω 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 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 1dB of peaking. The AD829’s 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 500Ω,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 A/D converters 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 a transimpedance amplifier offers. A bandwidth greater than 50MHz can be maintained for a range of gains through the replacement of the external compensation capacitor. The AD829 and the transimpedance amp lifier 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. The inputs of the AD829 are symmetrical.

Feature

• High speed
  – 120 MHz bandwidth, gain=-1
  – 230 V/μs 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 maximum input offset voltage (over temperature)
  – 0.3 μV/°C input offset drift
• Flexible operation
  – Specified for ±5 V to ±15 V operation
  – ±3 V output swing into a 150Ω load
  – External compensation for gains 1 to 20
  – 5 mA supply current
• Available in tape and reel in accordance with EIA-481A standard

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