ADA4691-2

PRODUCTION

Low Power, 3.6 MHz, Low Noise, Rail-to-Rail Output, Operational Amplifiers

Data Sheet (Rev. E) Product Selection Table
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Overview

  • Low power: 180 μA typical
  • Very low input bias currents: 0.5 pA typical
  • Low noise: 16 nV/√Hz typical
  • 3.6 MHz bandwidth
  • Offset voltage: 500 μV typical
  • Low offset voltage drift: 4 μV/°C maximum
  • Low distortion: 0.003% THD + N
  • 2.7 V to 5 V single supply or ±1.35 V to ±2.5 V dual supply
  • Available in very small 2 mm × 2 mm LFCSP packages

The ADA4691-2/ADA4692-2 are dual and the ADA4691-4/ADA4692-4 are the quad rail-to-rail output, single-supply amplifiers featuring low power, wide bandwidth, and low noise. The ADA4691-2 has two independent shutdown pins, allowing further reduction in supply current. The ADA4691-4 is a quad with dual shutdown pins each controlling a pair of amplifiers and is available in the 16-lead LFCSP. The ADA4692-4 is a quad version without shutdown.

These amplifiers are ideal for a wide variety of applications. Audio, filters, photodiode amplifiers, and charge amplifiers, all benefit from this combination of performance and features. Additional applications for these amplifiers include portable consumer audio players with low noise and low distortion that provide high gain and slew rate response over the audio band at low power. Industrial applications with high impedance sensors, such as pyroelectric and IR sensors, benefit from the high impedance and low 0.5 pA input bias, low offset drift, and enough bandwidth and response for low gain applications.

The ADA4691/ADA4692 family is fully specified over the extended industrial temperature range (−40°C to +125°C). The ADA4691-2 is available in a 10-lead LFCSP and a 9-ball WLCSP. The ADA4692-2 is available in an 8-lead SOIC and 8-lead LFCSP. The ADA4691-4 is available in a 16-lead LFCSP. The ADA4692-4 is available in a 14-lead TSSOP.

Applications

  • Photodiode amplifiers
  • Sensor amplifiers
  • Portable medical and instrumentation
  • Portable audio: MP3s, PDAs, and smartphones
  • Communications
  • Low-side current sense
  • ADC driver
  • Active filters
  • Sample-and-hold
ADA4691-2
Low Power, 3.6 MHz, Low Noise, Rail-to-Rail Output, Operational Amplifiers
ADA4691-2-pc ADA4691-2-pc1
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Documentation

Data Sheet 1

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • ADA4691

Analog Photodiode Wizard

Use Photodiode Wizard to design a transimpedance amplifier circuit to interface with a photodiode. Select a photodiode from the library included in the tool, or enter custom photodiode specifications. Quickly observe tradeoffs between Bandwidth, Peaking (Q), and ENOB/SNR. Modify circuit parameters, and immediately see results in plots for pulse response, frequency response, and noise gain.

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Analog Filter Wizard

Use the Analog Filter Wizard to design low-pass, high-pass, or band-pass filters with actual op amps in minutes. As you progress through the design process, you can observe the characteristics of your filter design from ideal specifications to real world circuit behavior. Quickly evaluate the tradeoffs in op amp specifications - including gain-bandwidth, noise, and supply current – to determine the best filter design for your requirements.

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SPICE Model 1

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

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EVAL-OPAMP-2

EVAL-OPAMP-2 Evaluation Board

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Product Details

The universal precision op amp evaluation boards have been designed and optimized for many circuit configurations allowing the users to best suit their applications. These boards are all RoHs compliant. See references below on what board to order by lead count and package.

  • EVAL-PRAOPAMP-2CPZ (dual 8-lead LFCSP) CP-8
  • EVAL-PRAOPAMP-2RMZ (dual 8-lead MSOP) RM-8
  • EVAL-PRAOPAMP-2RZ (dual 8-lead SOIC) R-8
EVAL-OPAMP-2
EVAL-OPAMP-2 Evaluation Board
EVAL-OPAMP-2 EVAL-OPAMP-2 EVAL-OPAMP-2

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