INA128U

Both the INA128 and INA129 (INA12x) are low-power, general-purpose instrumentation amplifiers with excellent accuracy. These amplifiers feature a versatile three-op-amp design and come in a small package, making them suitable for a wide range of applications. The current-feedback input circuit provides wide bandwidth even at high gains (200kHz, G = 100). Any gain from 1 to 10,000 can be set with a single external resistor. The INA128 offers the industry-standard gain equation with a 50kΩ resistor. The INA129 gain equation uses a 49.4kΩ resistor, allowing direct replacement of similar devices. The INA12x is available in plastic DIP and surface-mount packages and is specified for operation from –40°C to +85°C. The INA128 is also available in a dual configuration, the INA2128.

Applications

• Pressure transmitter
• Temperature transmitter
• Weighing scale
• Electrocardiogram (ECG)
• Analog input module
• Data acquisition (DAQ)

Key features

• Low offset voltage: 50μV (max)
• Low drift: 0.5μV/°C (max)
• Low input bias current: 5nA (max)
• Low noise: 8nV/√Hz, 0.2μVp-p
• High CMR: 120dB (min)
• Bandwidth: 1.3 MHz (G = 1)
• Input protection up to ±40V
• Wide supply voltage range: ±2.25V to ±18V
• Low quiescent current: 700μA
• Package: 8-pin plastic DIP, SO-8