PRELIMINARY TECHNICAL DATA

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a
Zero-Drift, Single-Supply,
Rail-to-Rail Input/Output
Low Noise Operational Amplifier
Preliminary Technical Data AD8628

FEATURES
Lowest auto-zero amplifier noise
Low Offset Voltage: 5 µV
Input Offset Drift: 0.03 µV/°C
Rail-to-Rail Input and Output Swing
5 V Single-Supply Operation
High Gain, CMRR, and PSRR: 120 dB
Very Low Input Bias Current: 100 pA
Low Supply Current: 1.3 mA
Overload Recovery Time: 0.2 ms
No External Components Required


APPLICATIONS
Automotive Sensors
Pressure and Position Sensors
Strain Gage Amplifiers
Medical Instrumentation
Thermocouple Amplifiers


GENERAL DESCRIPTION
This new family of amplifiers has ultra-low offset, drift and bias
current. The AD8628 is a wide bandwidth auto-zero amplifier
featuring rail-to-rail input and output swings and low noise.
Operation is fully specified from 2.7 to 5 volts single supply
(±1.35V to ±2.5V dual supply).

The AD8628 family provides the benefits previously found only
in expensive auto-zeroing or chopper-stabilized amplifiers.
Using Analog Devices’ new topology these zero-drift amplifiers
combine low cost, with high accuracy and low noise. (No
external capacitors are required.) In addition, the AD8628
greatly reduces the digital switching noise found in most
chopper stabilized amplifiers.

With an offset voltage of only 1µV, drift less than 0.005 µV/°C
and noise of only 0.5uV P-P (0Hz to 10 Hz) the AD8628 is
perfectly suited for applications where error sources cannot be
tolerated. Position and pressure sensors, medical equipment, and
strain gage amplifiers benefit greatly from nearly zero drift over
their operating temperature range. Many systems may take
advantage of the rail-to-rail input and output swings provided by
the AD8628 family to reduce input biasing complexity and
maximize SNR.

The AD8628 family is specified for the extended industrial
(-40° to +125°C) temperature range. The AD8628 amplifier is
available in the tiny SOT23 and the popular 8-pin narrow
SOIC plastic packages.


5-Lead SOT
(RT-5)

8-Lead SO
(R-8)

AD8628
AD8628