INA122UA - 36V Micropower Instrumentation Amplifier | Texas Instruments
MPN: INA122UA ✓ AktifINA122UA Genel Bakış
An instrumentation amplifier is a specialized analog signal-conditioning amplifier that measures the voltage difference between two inputs. Its internal differential architecture rejects common-mode interference, while programmable gain amplifies weak sensor signals before they reach an ADC. Within the broader hierarchy, the INA122UA is an instrumentation amplifier, analog amplifier, signal-conditioning IC, and power-management-compatible analog semiconductor designed for low-voltage precision acquisition.
Key features include a 60 uA typical quiescent current, a wide single-supply operating range extending to 36 V, and operation from dual supplies up to plus or minus 18 V. The input common-mode range can extend approximately 0.1 V below the negative supply, and the output supports rail-to-rail swing. Maximum offset voltage is 250 uV, while maximum offset drift is 3 uV per degree Celsius, supporting stable measurements where sensor baselines change with temperature.
The INA122UA uses a two-op-amp instrumentation-amplifier architecture to provide accurate, low-noise differential acquisition. Its gain is established by an external resistor, allowing the signal chain to be scaled without sacrificing input impedance or common-mode rejection. The 120 kHz bandwidth supports low-frequency industrial, biomedical, and instrumentation signals, but it is not intended for high-speed signal capture. Exact gain limits, noise density, input impedance, and common-mode rejection values require confirmation in the manufacturer datasheet.
Typical applications include portable ECG and physiological-signal front ends, industrial pressure and temperature sensors, low-current transducers, laboratory measurement systems, and battery-operated data loggers. In each case, the device combines a broad supply range with low quiescent current, helping preserve battery life while accepting sensor outputs that require common-mode rejection.
A key design consideration is the interaction between common-mode range, output swing, gain, and supply voltage. The input and output operating regions must remain valid during startup, sensor faults, and maximum signal excursions. Input filtering, source impedance balancing, and careful grounding are also important when offset and noise-sensitive measurements are required.
This page consolidates the verified manufacturer and distributor information for the INA122UA with package guidance, pricing availability notes, application analysis, and carefully qualified replacement considerations. Because the supplied records do not include complete numerical pricing or a complete pin map, those details are identified as unavailable rather than inferred.
Drop-in alternatifler için INA122UA — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
Bu Serideki Variantlar
Yedek parça uyumlu olan aynı serideki modeller INA122UA (aynı form faktörü ve ayağa oturma) — farklı olan Package, Quiescent Current, Circuit Count, Offset Voltage, Output Swing.
INA122U
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →INA122UAG4
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
INA122UA/2K5
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
INA121UG4
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
INA126U
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →INA122UA Maksimum Değerlendirmeler & Elektriksel Özellikler
| Product Type | Precision instrumentation amplifier |
| Architecture | Two-op-amp design |
| Number of Channels | 1 circuit |
| Single-Supply Voltage Range | 2.2 V to 36 V |
| Dual-Supply Voltage Range | +/-18 V |
| Durağan Akım | 60 uA |
| Gain-Bandwidth Product | 120 kHz |
| Input Common-Mode Range | Approximately 0.1 V below the negative supply |
| Output Swing | Rail-to-rail |
| Maximum Offset Voltage | 250 uV |
| Maximum Offset Drift | 3 uV/degree Celsius |
| Paket | 8-pin SOIC |
| Montaj Türü | Surface mount |
INA122UA 8-pin soic Pin Yapısı Kılavuzu
INA122UA (8-pin soic paket) için pin yapısı. Bu analog bileşen, giriş, çıkış ve güç besleme pinleri içerir. Ofset null, telafi ve etkinleştirme pin yapılandırmaları için üretici veri kitapçığını referans alın. Sinyal işleme ve güç amplifikasyon devreleri için mükemmel bir bileşendir.
Ayrıntılı pin çıkış verisi mevcut değil: INA122UA.
Aşağıdaki veri sayfası tam pin konfigürasyonu için.
Tipik Uygulamalar
INA122UA için uygundur 6 uygulamas: Portable Medical Signal Acquisition, Battery-Powered Data Loggers, Industrial Pressure Sensor Interface, Low-Current Transducer Measurement, Laboratory Measurement Systems, Temperature and Transducer Monitoring.
Portable Medical Signal Acquisition
The INA122UA fits portable medical front ends because its 60 uA quiescent current limits standby consumption and its single-supply operation simplifies battery-powered designs. The 250 uV maximum offset and 3 uV-per-degree-Celsius maximum offset drift help preserve measurement stability as temperature changes. It can condition a differential sensor output before conversion by an ADC, although the selected gain must keep the common-mode input and output swing within their valid ranges. Input protection, patient isolation, and application-specific medical qualification must be provided outside the amplifier itself.
Battery-Powered Data Loggers
For battery-powered data loggers, the INA122UA combines a 2.2 V minimum single-supply input with a 60 uA quiescent current, allowing analog channels to remain active without continuously draining the battery. Its two-op-amp differential architecture rejects common-mode voltage present on sensor wiring, while the 120 kHz bandwidth covers many temperature, pressure, and position transducer signals. Estimated quiescent power at 3.3 V is 198 uW using 3.3 V multiplied by 60 uA, excluding sensor and feedback-network current.
Industrial Pressure Sensor Interface
The INA122UA is appropriate for bridge or resistive pressure sensors whose useful output is small and may sit on a substantial common-mode voltage. Its differential input can suppress that common-mode component, while the programmable gain path brings the sensor signal into a more useful ADC range. The 36 V maximum single-supply capability provides additional headroom for industrial systems, but designers must verify the pressure transducer’s excitation, output range, grounding, and isolation requirements against the INA122 electrical limits.
Low-Current Transducer Measurement
The INA122UA can serve as the front end for low-level current or voltage transducers when low quiescent power and differential measurement are priorities. Its verified 250 uV maximum input offset is materially smaller than many millivolt-level sensor signals, helping preserve signal integrity before amplification. The 60 uA supply demand also reduces the burden on portable power systems. Selection still requires checking input bias current, noise density, gain range, and source-impedance limits against the smallest expected transducer output.
Laboratory Measurement Systems
The INA122UA is useful in laboratory instruments that measure weak differential signals while keeping analog power consumption low. Its 120 kHz bandwidth is sufficient for many precision DC and low-frequency measurements, and rail-to-rail output swing can improve utilization of the available supply range. For instrument-grade systems, engineers should confirm noise, common-mode rejection, offset matching, and gain accuracy from the complete manufacturer datasheet, then add calibration and shielding appropriate to the measured source.
Temperature and Transducer Monitoring
The INA122UA supports compact temperature and transducer monitoring systems that require a differential input but operate from limited current budgets. The 60 uA quiescent current is especially useful when many analog channels are multiplexed into a low-power acquisition system. Its low maximum offset of 250 uV and drift of 3 uV per degree Celsius help establish a predictable measurement floor. The selected external gain resistor, input filters, and ADC interface should be sized together to avoid consuming signal headroom or adding excessive noise.
Mühendislik referans verileri: INA122UA — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | INA122U | INA122UAG4 | INA122UA/2K5 | INA121UG4 | INA126U |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Product Type | Precision instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier |
Ana Farklılayıcılar
- Low-power precision signal conditioning (karşılaştırma:INA121UG4)
- Broad single-supply operating range (karşılaştırma:INA126U)
- Defined 120 kHz signal bandwidth (karşılaştırma:INA122U)
Tasarım Notları
Validate the complete signal path against the INA122 common-mode and output-swing limits. A sensor output may remain inside the power-supply range while still exceeding the usable input range after gain is applied. Check minimum supply voltage, sensor excitation range, maximum differential signal, amplifier gain, and the ADC input range together. This is especially important because a rail-to-rail output does not imply unrestricted input common-mode operation.
Place the gain-setting resistor close to the appropriate INA122 gain pin and keep input and feedback traces short and symmetrical. Use a continuous ground reference beneath the analog section, avoid routing sensor inputs beneath switching nodes or digital clocks, and provide local supply bypassing. For long sensor cables, use input filtering and shield grounding appropriate to the sensor rather than relying only on the amplifier’s common-mode rejection.
Estimated quiescent power at a 3.3 V supply is 198 uW, calculated from 3.3 V multiplied by the verified 60 uA quiescent current. This excludes sensor excitation, feedback current, output load, and regulator losses. In battery-operated equipment, calculate the average system current with the amplifier enabled continuously or intermittently, then include any protection leakage and ADC reference currents when sizing the power budget.
Uyumluluk Bilgisi
The supplied verified records do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for INA122UA. Confirm current declarations on the official Texas Instruments product and datasheet pages.