INA2128P - Dual Precision Instrumentation Amplifier | TI
部品番号: INA2128P ✓ 生産中INA2128P 概要
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.
ドロップイン代替品: INA2128P — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: INA2128P （同一形状・フットプリント） — 相違点: Package, Supply Voltage Range, Architecture, Input Offset Voltage, Product Type.
INA128P
✅ ドロップイン ⚠️ 仕様未検証価格はお問い合わせください
データシートを見る →INA129P
✅ ドロップイン ⚠️ 仕様未検証価格はお問い合わせください
データシートを見る →INA120P
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
INA121P
✅ ドロップイン ⚠️ 仕様未検証価格はお問い合わせください
データシートを見る →INA126P
✅ ドロップイン ⚠️ 仕様未検証価格はお問い合わせください
データシートを見る →INA2128P 最大定格＆電気的特性
| 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 |
| パッケージ | 16-pin PDIP (SOL-16) |
| 実装タイプ | Through-hole |
INA2128P 16-pin pdip (sol-16) ピン配置ガイド
INA2128P (16-pin pdip (sol-16) パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: INA2128P.
詳細は データシート をご参照ください。
主な用途
INA2128P の用途: 6 件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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: INA2128P — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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 |
主な差別化要因
- Two precision amplifiers in one package （vs INA128P)
- High common-mode rejection for precision sensing （vs INA129P)
- Low offset and drift for small differential signals （vs INA120P)
- Defined bandwidth at high gain （vs INA121P)
設計ノート
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.
コンプライアンス情報
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.
