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ADA4891-2ARZ-R7

ADI dual-channel 240MHz op-amp, 170V/us slew rate, R-R output, SOIC-8, per-channel shutdown

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Manufacturer Part：

ADA4891-2ARZ-R7

Package：

SOIC-8 (ARZ suffix, 4.9mm x 3.9mm)

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Description

Product Overview

The ADA4891-2ARZ-R7 from Analog Devices is a dual-channel, high-speed, single-supply operational amplifier in an SOIC-8 package. With 240MHz bandwidth, 170V/us slew rate, and rail-to-rail output, it delivers excellent performance for video buffering, ADC driving, and active filtering while consuming only 4.3mA per channel from a 2.7V to 5.5V supply.

Key Specifications

Channels 2
Supply Voltage 2.7V ~ 5.5V (single supply)
Bandwidth (-3dB, G=+1) 240MHz
Slew Rate 170V/us
Input Offset Voltage plus/minus 3mV (max, 25C)
Supply Current per Channel 4.3mA typical
Output Current 150mA peak
Output Swing Rail-to-rail (0.1V ~ VCC-0.1V)
Operating Temperature -40C ~ +125C

Features

  • 240MHz bandwidth and 170V/us slew rate for high-speed signal processing
  • Rail-to-rail output swings within 100mV of both supply rails
  • Independent shutdown per channel (SDA, SDB pins) reduces power to 0.5uA
  • Low 4.4nV/rtHz input noise for precision applications
  • 30ns settling time to 0.1% for fast ADC driving
  • 150mA peak output current for driving low-impedance loads

Applications

  • Video buffer and line driver
  • ADC and DAC driver amplifier
  • Active filter for communications
  • Portable medical and instrumentation front-ends
  • Single-supply signal conditioning

The ADA4891-2ARZ-R7 from Analog Devices is a dual-channel, high-speed voltage feedback operational amplifier optimized for single-supply operation from 2.7V to 5.5V. With a 240MHz -3dB bandwidth at unity gain and a 170V/us slew rate, it is well-suited for video and high-frequency signal processing applications. The rail-to-rail output stage swings to within 100mV of both supply rails on a 1k-ohm load, maximizing dynamic range in single-supply systems. Each channel features an independent shutdown pin that reduces supply current to 0.5uA when the amplifier is not needed, making the device suitable for power-sensitive applications with intermittent signal processing. The 150mA peak output current capability allows the ADA4891-2 to drive low-impedance loads such as 75-ohm video cables and low-impedance ADC inputs directly.

The ADA4891-2ARZ-R7 uses a voltage feedback architecture with a two-stage design. The input stage is a differential pair that converts the input voltage difference into a current signal. The transimpedance stage (gain stage) converts this current back to voltage with high gain. The output stage is a rail-to-rail class-AB push-pull buffer that can swing within 100mV of both supply rails. The 240MHz bandwidth and 170V/us slew rate are achieved through a wideband internal compensation scheme optimized for unity-gain stability. The shutdown function works by disabling the bias current of the input stage, effectively turning off the amplifier while consuming only 0.5uA. The device settles to 0.1% in 30ns for a 2V step, making it an excellent driver for medium-speed ADCs that require fast settling.

Pin Name Function
1 OUT A Channel A Output
2 -IN A Channel A Inverting Input
3 +IN A Channel A Non-inverting Input
4 V- Negative Supply / Ground
5 +IN B Channel B Non-inverting Input
6 -IN B Channel B Inverting Input
7 OUT B Channel B Output
8 V+ Positive Supply
  • Video buffering: Drive 75-ohm video cables with 150mA output current while maintaining signal fidelity up to 240MHz
  • ADC driving: Settle to 0.1% in 30ns for driving medium-speed (10~50MSPS) ADCs with rail-to-rail output range
  • Active filters: Implement high-frequency low-pass, band-pass, or Sallen-Key filters with 240MHz bandwidth
  • Portable instrumentation: Condition sensor signals in battery-powered devices with per-channel shutdown for power savings
  • Single-supply signal chain: Replace dual-supply op-amps in 3.3V/5V systems with rail-to-rail output and 4.4nV/rtHz noise
Model Brand GBW Slew Rate Channels
ADA4891-1ARZ ADI 240MHz 170V/us 1
ADA4891-4ARUZ ADI 240MHz 170V/us 4
LMH6643MA TI 130MHz 130V/us 2
OPA2350EA TI 38MHz 22V/us 2
MCP6292-I/SN Microchip 10MHz 6V/us 2
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