INA2128P - Dual Precision Instrumentation Amplifier | TI
料号： INA2128P ✓ 量产中INA2128P 概述
An instrumentation amplifier is a differential analog signal-conditioning IC that amplifies the voltage difference between two inputs while rejecting common-mode interference. In the signal-chain hierarchy, an instrumentation amplifier is a specialized amplifier, a precision analog front end, and an active analog integrated circuit. The INA2128P uses a three-op-amp arrangement and current-feedback input circuitry to preserve useful bandwidth even when relatively high gain is selected.
A single external resistor sets the gain from 1 to 10,000, simplifying adjustment during design and calibration. The 200 kHz bandwidth available at gain 100 supports accurate amplification of sensors and low-frequency measurement signals without requiring the bandwidth of a high-speed instrumentation amplifier. Input protection extending to plus or minus 40 V also helps control fault energy applied to the input pins, although it does not eliminate the need for normal application-level protection.
The INA2128P provides two amplifier circuits in one package, allowing a dual-channel design to reduce board area and component count. Its low offset voltage and low drift are particularly useful when the amplified differential signal is small relative to the measurement resolution. The specified 120 dB minimum common-mode rejection helps suppress noise and voltage that appears equally on both inputs, while the low 5 nA maximum input bias current suits high-impedance sources.
Typical uses include bridge-sensor signal conditioning, portable instrumentation, biomedical measurement, industrial process monitoring, and two-channel sensor acquisition. The device can also amplify differential outputs from transducers where low offset and common-mode rejection are more important than wide-bandwidth conversion performance.
Designers should follow the manufacturer datasheet for the gain-setting resistor, supply bypassing, input protection, and pin assignments. The power-supply range is plus or minus 18 V, so both positive and negative rails are permitted when the circuit requires bipolar input or output ranges. Decoupling capacitors should be placed close to the supply pins, and source impedance should remain compatible with the amplifier's bias-current and bias-voltage requirements.
This page combines verified manufacturer and distributor information with package-aware alternatives, application guidance, and engineering-focused selection notes. It also separates verified INA2128P data from parameters that require confirmation in the full datasheet, helping engineers plan a board revision without treating incomplete data as guaranteed specifications.
直接替换替代料： INA2128P ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： INA2128P （相同外形与封装尺寸） ——差异在于 Package, Supply Voltage Range, Architecture, Input Offset Voltage, Product Type.
INA128P
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →INA129P
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →INA120P
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
INA121P
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →INA126P
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →INA2128P 最大额定值与电气特性
| Amplifier Configuration | Dual instrumentation amplifier |
| Number of Amplifier Circuits | 2 circuits |
| Internal Architecture | 3-op-amp instrumentation amplifier |
| Gain Range | 1 to 10,000 |
| Gain Setting | 1 external resistor |
| Bandwidth at Gain 100 | 200 kHz |
| Input Offset Voltage | 50 uV maximum |
| Input Offset Drift | 0.5 uV/degree C maximum |
| Input Bias Current | 5 nA maximum |
| Common-Mode Rejection | 120 dB minimum |
| Input Protection Range | plus or minus 40 V |
| Supply Voltage Range | plus or minus 18 V |
| Input Circuitry | Current feedback |
| Power Class | Low power |
| 封装 | 16-pin PDIP (SOL-16) |
| 安装类型 | Through-hole |
INA2128P 16-pin pdip (sol-16) 引脚配置指南
INA2128P（16-pin pdip (sol-16) 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： INA2128P.
请参阅 数据手册 以查看完整引脚配置。
典型应用
INA2128P 适用于 6 应用s: Bridge Sensor Signal Conditioning, Biomedical Instrument Signal Acquisition, Industrial Process Monitoring, Portable Measurement Instrumentation, Current-Shunt Measurement, Audio and Balanced-Signal Conditioning.
Bridge Sensor Signal Conditioning
The INA2128P fits bridge-based pressure, load-cell, and force sensing because its differential inputs are designed to amplify small sensor voltages while rejecting common-mode error. The verified 120 dB minimum common-mode rejection and 50 uV maximum offset voltage help preserve measurement integrity, while a gain range of 1 to 10,000 accommodates both millivolt-level and higher-level bridge outputs. One external resistor sets the gain. Designers should connect the bridge close to the amplifier, maintain matched routing, and verify the bridge excitation voltage, input common-mode range, and output swing against the manufacturer electrical-characteristics table.
推荐
Biomedical Instrument Signal Acquisition
The INA2128P is appropriate for low-level biomedical acquisition when two differential channels must be amplified with low offset and low drift. Its 50 uV maximum offset, 0.5 uV/degree C maximum drift, and 5 nA maximum input bias current are useful for preserving small signals from resistive sensors and electrode interfaces. The 200 kHz bandwidth at gain 100 is suitable for many physiological and diagnostic signals without requiring a high-speed instrumentation amplifier. Input protection to plus or minus 40 V adds a controlled clamp function, although biomedical designs still require application-specific limiting and verified patient-safety isolation.
推荐
Industrial Process Monitoring
The INA2128P supports dual-channel industrial process monitoring where pressure, temperature, or current sensors produce differential outputs. The 120 dB minimum common-mode rejection helps reject noise coupled from motors, switching equipment, and long cables, while the selectable gain from 1 to 10,000 supports signals spanning millivolts to volts. The 16-pin PDIP package is straightforward to assemble and service on through-hole industrial boards. For reliable operation, verify the input common-mode limits under the worst-case sensor voltage and keep input and gain-resistor paths short and symmetric.
推荐
Portable Measurement Instrumentation
The INA2128P is suitable for portable measurement equipment that needs two precision analog channels in a low-power through-hole package. Its dual three-op-amp architecture reduces the number of separate amplifier packages, while low offset voltage and low thermal drift improve measurement repeatability over changing ambient conditions. The gain range of 1 to 10,000 supports programmable or selectable measurement ranges. Because the device accepts supply voltages up to plus or minus 18 V, battery-powered systems should optimize the supply arrangement and confirm actual quiescent-current requirements, which were not included in the supplied verified data.
推荐
Current-Shunt Measurement
The INA2128P can amplify the differential voltage produced by a current-sense shunt while rejecting the large common-mode voltage present on the shunt. The verified 120 dB minimum common-mode rejection is the primary reason to select this instrumentation amplifier for such measurements, and the 5 nA maximum input bias current reduces errors with practical shunts. A gain of 1 to 10,000 permits flexible sensitivity, but the exact gain must remain compatible with the 200 kHz bandwidth specification at gain 100. Layout should use a Kelvin connection to minimize shunt and trace resistance.
推荐
Audio and Balanced-Signal Conditioning
The INA2128P can condition balanced low-level audio or communications signals when differential rejection is more important than audio-frequency bandwidth. Its 120 dB minimum common-mode rejection helps suppress hum and interference appearing equally on both conductors, while the dual architecture supports stereo or two-channel conditioning. The verified 200 kHz bandwidth at gain 100 is suitable for many low-frequency signal paths, and the adjustable gain range of 1 to 10,000 accommodates different source levels. Designers should avoid using this precision, low-power device where high-frequency audio performance requires a dedicated audio instrumentation amplifier.
推荐
推荐产品汇总
工程参考数据： INA2128P ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | INA128P | INA129P | INA120P | INA121P | INA126P |
|---|---|---|---|---|---|---|
| Package | 16-pin PDIP (SOL-16) | 16-pin PDIP | 16-pin PDIP | 16-pin PDIP | 16-pin PDIP | 16-pin PDIP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
关键差异点
- Two precision amplifiers in one package （对比 INA128P)
- High common-mode rejection for precision sensing （对比 INA129P)
- Low offset and drift for small differential signals （对比 INA120P)
- Defined bandwidth at high gain （对比 INA121P)
设计说明
Do not treat the INA2128P input-protection rating as a substitute for normal signal conditioning. The verified inputs are protected to plus or minus 40 V, but continuous overvoltage, high-energy transients, and source impedance can still affect the device. Confirm the absolute-maximum and electrical-characteristics tables, use source impedance suitable for the input bias current, and preserve the sensor's common-mode voltage within the operating range.
Route the two differential input channels as symmetric pairs and keep them away from switching nodes and high-current traces. Connect the gain-setting resistor close to the gain pin, observe the manufacturer's stability recommendations, and place supply-bypass capacitors near the device. Because the INA2128P can provide gains up to 10,000, parasitic resistance and capacitance can materially alter gain, bandwidth, and stability.
The verified supply range extends to plus or minus 18 V. If both rails are used, verify power-up sequencing, rail polarity, ground reference, output swing, and input common-mode limits for the exact gain setting. A negative supply does not automatically guarantee a negative output across the full input range, so validate the operating region from the manufacturer electrical-characteristics table rather than inferring it from the package rails.
合规信息
The supplied verified search results do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for INA2128P. No compliance claim has been inferred.
