The INA129U2K5 is a low‑power, high‑precision instrumentation amplifier designed for precision signal conditioning in measurement systems
Specifications
Manufacturer:
TI
Product Number:
INA129U/2K5
Description:
IC INST AMP 1 CIRCUIT 8SOIC
Highlight:
INA129U2K5 precision instrumentation amplifier
,low-power instrumentation amplifier IC
,high-precision signal conditioning IC
Introduction
INA129U2K5 Precision Instrumentation Amplifier
The INA129U2K5 is a low-power, high-precision instrumentation amplifier designed for precision signal conditioning in measurement systems, featuring ultra-low offset voltage and high common-mode rejection.
Product Overview
The INA129U2K5 is a low-power, high-precision instrumentation amplifier from TI, designed for precision signal conditioning in measurement systems. It features a versatile three-op-amp architecture with current-feedback input circuitry, delivering wide bandwidth even at high gain. The device is laser-trimmed for ultra-low offset voltage, low drift, and high common-mode rejection ratio (CMRR), making it ideal for amplifying small differential signals in noisy environments. The U2K5 suffix denotes an 8-pin SOIC surface-mount package in tape-and-reel packaging.
Core Functions & Specifications
Precision Signal Amplification
- Gain Configuration: Gain is set by a single external resistor (RG), with the gain formula: G = 1 + 49.4kΩ / RG, supporting gains from 1 to 10,000
- Low Offset & Drift: Max input offset voltage = 50 μV; max offset drift = 0.5 μV/°C, ensuring long-term measurement stability
- High Input Impedance: Input impedance > 10 GΩ, minimizing loading on high-impedance sensors
- Low Input Bias Current: Max input bias current = 5 nA, suitable for low-level sensor signals
High Common-Mode Rejection
CMRR ≥ 120 dB (at G ≥ 100), effectively rejecting common-mode noise and interference. Wide input common-mode voltage range, compatible with single-ended and differential sensor outputs.
Wide Bandwidth & Slew Rate
Current-feedback design provides 200 kHz bandwidth at G = 100 and 1.3 MHz at minimum gain. Slew rate = 4 V/μs, enabling fast response to dynamic signals.
Power & Protection
- Wide Supply Range: Operates from ±2.25 V to ±18 V (single supply: 4.5 V to 36 V), suitable for battery-powered systems
- Low Quiescent Current: Typical 700 μA, minimizing power consumption
- Input Overvoltage Protection: Withstands ±40 V without damage, enhancing system robustness
Package & Temperature
8-pin SOIC (U) package, surface-mount compatible. Operating temperature: -40°C to +85°C.
Typical Applications
- Bridge Amplifiers: Strain gauges, load cells, pressure sensors
- Thermocouple & RTD Amplifiers: Precision temperature measurement
- Medical Instrumentation: ECG, EEG, and patient monitoring systems
- Data Acquisition Systems: Low-level signal conditioning for industrial and scientific measurements
- Industrial Process Control: Sensor signal amplification in harsh environments
- Portable Measurement Devices: Battery-powered meters and testers
Key Features Summary
- Low-power, high-precision instrumentation amplifier
- Single external resistor for gain (1-10,000)
- Ultra-low offset (50 μV max) and drift (0.5 μV/°C max)
- High CMRR (120 dB min at G ≥ 100)
- Wide bandwidth (200 kHz at G = 100)
- Low quiescent current (700 μA typ)
- Input overvoltage protection (±40 V)
- 8-pin SOIC package, -40°C to +85°C operation
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