1 Features
• Low offset voltage: 50 μV max
• Low drift: 0.5 μV/°C max
• Low input bias current: 5 nA max
• Input voltage noise: 8 nV/√Hz at 1 kHz
• High bandwidth: 1.3 MHz at G=1 V/V
• High CMR: 120 dB min
• Inputs protected to ±40 V
• Wide supply range: ±2.25 V to ±18 V
• Low quiescent current: 700 μA per channel
• Temperature range: –40°C to +85°C
• Package: 16-pin SOIC

2 Applications
• Pressure transmitter
• Temperature transmitter
• Weigh scale
• Electrocardiogram (ECG)
• Analog input module
• Data acquisition (DAQ)

3 Description
The INA2128 is a dual, low-power, general-purpose
instrumentation amplifier (IA) offering excellent
accuracy. The versatile three-op-amp design and
small size make this device an excellent choice for
a wide range of applications. Current-feedback input
circuitry provides wide bandwidth, even at high gain
(200 kHz at G = 100). A single external resistor sets
any gain from 1 to 10,000. Internal input protection
can withstand up to ±40 V without damage.
The INA2128 is laser-trimmed for very low offset
voltage (50 μV), drift (0.5 μV/°C) and high commonmode
rejection (120 dB at G ≥ 100). The device
operates with power supplies as low as ±2.25 V,
and quiescent current is only 700 μA per IA—a
great choice for battery-operated and multiple-channel
systems.
The INA2128 is available in an SOIC-16 package, and
is specified from –40°C to +85°C.