The INA128 and INA129 (INA12x) are low-power, general-purpose instrumentation amplifiers that offer excellent accuracy. The versatile three op amp design and small size make these amplifiers 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. The INA128 provides an industry-standard gain equation with a 50-kΩ resistor. The INA129 gain equation uses a 49.4-kΩ resistor to allow for drop-in replacements of comparable devices.
The INA12x are available in plastic DIP and surface-mount packages, specified for the –40°C to +85°C temperature range. The INA128 is also available in a dual configuration, the INA2128.
The upgraded INA828 offers a lower input bias current (0.6 nA, max) and lower noise (7 nV/√Hz) at the same quiescent current. See the Device Comparison Table for a selection of precision instrumentation amplifiers from Texas Instruments.
PART NUMBER | PACKAGE(1) | BODY SIZE (NOM) |
---|---|---|
INA128, INA129 | SOIC (8) | 3.91 mm × 4.90 mm |
PDIP (8) | 6.35 mm × 9.81 mm |
Changes from Revision E (April 2019) to Revision F (May 2022)
Changes from Revision D (January 2018) to Revision E (April 2019)
Changes from Revision C (October 2015) to Revision D (January 2018)
Changes from Revision B (February 2005) to Revision C (April 2015)
DEVICE | DESCRIPTION | GAIN EQUATION | RG PINS AT PIN |
---|---|---|---|
INA818 | 35-µV offset, 0.4-µV/°C VOS drift, 8-nV/√Hz noise, low-power, precision instrumentation amplifier | G = 1 + 50 kΩ / RG | 1, 8 |
INA821 | 35-µV offset, 0.4-µV/°C VOS drift, 7-nV/√Hz noise, high-bandwidth, precision instrumentation amplifier | G = 1 + 49.4 kΩ / RG | 2, 3 |
INA828 | 50-µV offset, 0.5-µV/°C VOS drift, 7-nV/√Hz noise, low-power, precision instrumentation amplifier | G = 1 + 50 kΩ / RG | 1, 8 |
INA333 | 25-µV VOS, 0.1-µV/°C VOS drift, 1.8-V to 5-V, RRO, 50-µA IQ, chopper-stabilized INA | G = 1 + 100 kΩ / RG | 1, 8 |
PGA280 | 20-mV to ±10-V programmable gain IA with 3-V or 5-V differential output; analog supply up to ±18 V | Digital programmable | N/A |
INA159 | G = 0.2 V differential amplifier for ±10-V to 3-V and 5-V conversion | G = 0.2 V/V | N/A |
PGA112 | Precision programmable gain op amp with SPI | Digital programmable | N/A |