Ultralow Distortion, High Speed Op Amp, Stable at Gain of 2

The AD9631/AD9632 are very high speed and wide bandwidth amplifiers. The AD9631 is unity gain stable. The AD9632 is stable at gains of 2 or greater. Using a voltage feedback architecture, the exceptional settling time, bandwidth, and low distortion of the AD9631/AD9632 meet the requirements of many applications that previously depended on current feedback amplifiers. Its classical op amp structure works much more predictably in many designs.

A proprietary design architecture has produced an amplifier that combines many of the best characteristics of both current feedback and voltage feedback amplifiers. The AD9631/AD9632 exhibit exceptionally fast and accurate pulse response (16 ns to 0.01%) as well as extremely wide small signal and large signal bandwidth and ultralow distortion. The AD9631 achieves −72 dBc at 20 MHz, 320 MHz small signal bandwidth, and 175 MHz large signal bandwidths.

These characteristics position the AD9631/AD9632 ideally for driving flash as well as high resolution ADCs. Additionally, the balanced high impedance inputs of the voltage feedback architecture allow maximum flexibility when designing active filters.

The AD9631/AD9632 are offered in the industrial (−40°C to +85°C) temperature range. They are available in PDIP and SOIC.

APPLICATIONS

* ADC input driver

* Differential amplifiers

* IF/RF amplifiers

* Pulse amplifiers

* Professional video

* DAC current to voltage

* Baseband and video communications

* Pin diode receivers

* Active filters/integrators/log amps

* Wide bandwidth

G = +2

Small Signal

250 MHz

Large Signal (4 V p-p)

180 MHz

* Ultralow Distortion (SFDR), Low Noise

−113 dBc Typ @ 1 MHz

−95 dBc Typ @ 5 MHz

−72 dBc Typ @ 20 MHz

46 dBm Third Order Intercept @ 25 MHz

7.0 nV/√Hz Spectral Noise Density

* High Speed

Slew Rate 1300 V/µs

Settling 16 ns to 0.01%, 2 V Step

±3 V to ±5 V Supply Operation

17 mA Supply Current