AD8628/AD8629/AD8630
GENERAL DESCRIPTION
This amplifier has ultralow offset, drift, and bias current. The
AD8628/AD8629/AD8630 are wide bandwidth auto-zero
amplifiers featuring rail-to-rail input and output swings and low
noise. Operation is fully specified from 2.7 V to 5 V single
supply (±1.35 V to ±2.5 V dual supply).
The AD8628/AD8629/AD8630 provide benefits previously
found only in expensive auto-zeroing or chopper-stabilized
amplifiers. Using Analog Devices’ topology, these zero-drift
amplifiers combine low cost with high accuracy and low noise.
No external capacitor is required. In addition, the AD8628/
AD8629/AD8630 greatly reduce the digital switching noise
found in most chopper-stabilized amplifiers.
With an offset voltage of only 1 μV, drift of less than
0.005 μV/°C, and noise of only 0.5 μV p-p (0 Hz to 10 Hz), the
AD8628/AD8629/AD8630 are suited for applications in which
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 can take advantage of the rail-to-rail input and
output swings provided by the AD8628/AD8629/AD8630 to
reduce input biasing complexity and maximize SNR.
The AD8628/AD8629/AD8630 are specified for the extended
industrial temperature range (−40°C to +125°C). The AD8628
is available in tiny TSOT-23, SOT-23, and the 8-lead narrow
SOIC plastic packages. The AD8629 is available in the standard
8-lead narrow SOIC and MSOP plastic packages. The AD8630
quad amplifier is available in 14-lead narrow SOIC and TSSOP
plastic packages.
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