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AD8476BRMZ

Low-power fully diff amp G=1, 330µA, 6MHz, 39nV/√Hz, VOCM pin, ±18V OVP, MSOP-8

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Manufacturer Part：

AD8476BRMZ

Package：

8-lead MSOP (3.0 x 3.0mm)

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Description

Product Overview

The AD8476BRMZ is a low-power, unity-gain fully differential amplifier and ADC driver from Analog Devices. Consuming only 330µA supply current, it provides precision gain of 1 with 200µV max output offset, 39nV/√Hz noise, and -126dB HD2 at 10kHz. The VOCM pin sets the output common-mode voltage to match ADC input requirements, while ±18V overvoltage protection ensures robustness in industrial environments. Housed in 8-lead MSOP.

Key Specifications

Gain 1 V/V (unity, integrated resistors)
Bandwidth 6MHz (-3dB)
Slew Rate 10 V/µs
Supply Current 330µA (typical)
Output Offset Voltage 200µV max (B grade)
Output Noise 39 nV/√Hz
HD2 / HD3 -126dB / -128dB @ 10kHz
Gain Drift 1 ppm/°C
Supply Voltage 3V to 18V single, ±1.5V to ±9V dual
Overvoltage Protection Up to ±18V beyond supplies
Output Type Differential, Rail-to-Rail
Package 8-lead MSOP (3.0 x 3.0mm)
Operating Temperature -40°C to +125°C

Features

  • Ultra-low 330µA supply current
  • Unity gain with integrated precision resistors
  • VOCM pin for output common-mode voltage control
  • Rail-to-rail differential outputs for maximum dynamic range
  • Drives 16-bit ADCs up to 250kSPS
  • 1ppm/°C gain drift — excellent over temperature
  • ±18V overvoltage protection beyond supply rails
  • Single-ended to differential conversion
  • Settles to 16-bit accuracy in 1µs

Applications

  • Precision ADC driver for SAR and sigma-delta converters
  • Single-ended to differential signal conversion
  • Differential instrumentation amplifier building block
  • Thermocouple and bridge sensor signal conditioning
  • Battery-powered precision measurement
  • Industrial process control front-ends

The AD8476BRMZ is a very low power, unity-gain fully differential precision amplifier from Analog Devices, designed primarily as an ADC driver. With integrated gain-setting resistors for precise G=1, it converts single-ended inputs to differential outputs while the VOCM pin sets the output common-mode voltage to match the ADC’s input range. The amplifier features only 330µA supply current, 200µV max output offset, 39nV/√Hz noise density, and -126dB HD2, making it suitable for driving 16-bit ADCs at up to 250kSPS. Overvoltage protection up to ±18V beyond the supply rails ensures robustness in industrial environments where input signals may exceed the amplifier’s supply voltage.

The AD8476 uses an internal op-amp with four precision-trimmed 10kΩ resistors in a difference-amplifier configuration. The resistors set a fixed gain of 1 V/V between the differential input and differential output. An internal common-mode feedback loop maintains output balance and suppresses even-order harmonic distortion. The VOCM pin is the input to this feedback loop; connecting it to the ADC’s reference midpoint (e.g., VREF/2) forces the AD8476’s output common-mode to match the ADC’s optimum input common-mode voltage. The output stage is a push-pull rail-to-rail design that can drive capacitive ADC input loads directly. The overvoltage protection uses internal ESD structures and current-limiting to tolerate input voltages up to 18V above or below the supply rails.

Pin Name Description
1 VOCM Output common-mode voltage set point
2 VIN+ Non-inverting input (+IN)
3 VIN- Inverting input (-IN)
4 -VS Negative supply (or GND for single supply)
5 +OUT Positive differential output
6 -OUT Negative differential output
7 +VS Positive supply (3V to 18V)
8 NC No connect
  • SAR ADC Driver: Drive a 16-bit SAR ADC such as the AD7980 from a single-ended sensor. Connect the sensor to VIN+ and ground VIN- for single-ended-to-differential conversion. Tie VOCM to the ADC’s VREF/2 point to center the output common-mode. The 1µs settling to 16-bit accuracy matches SAR ADC acquisition times.
  • Thermocouple Amplifier: Use the AD8476 as the front-end for a K-type thermocouple measurement system. The differential input rejects common-mode noise picked up on the thermocouple leads. The ±18V overvoltage protection handles transients in industrial environments. Pair with a cold-junction compensator like the AD8495.
  • Bridge Sensor Interface: Connect a Wheatstone bridge’s differential output to the AD8476 inputs. The precision G=1 preserves the bridge’s millivolt output without gain error, while the VOCM pin levels the output to the ADC’s input range. The 1ppm/°C gain drift ensures measurement stability over temperature.
Model Gain Current Bandwidth Key Difference
AD8476ACPZ-R7 1 330µA 6MHz LFCSP-16 package option
ADA4940-1 1/2 1.5mA 30MHz Programmable gain, faster
THS4551 Varying 1.4mA 27MHz TI alternative, higher speed
LMH6550 Varying 10mA 360MHz Texas Instruments, very high speed
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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