INA128P - 130dB CMRR Precision INA | Texas Instruments
MPN: INA128P ✓ نشطINA128P نظرة عامة
An instrumentation amplifier is a specialized amplifier-IC category designed to amplify small differential sensor signals while rejecting common-mode interference. INA128P belongs to the instrumentation-amplifier hierarchy, which also includes differential amplifiers and analog front ends for measurement systems. Its three-op-amp architecture provides accurate differential gain, high input impedance, and flexible gain selection with an external resistor.
Key features include a low offset voltage of 50 µV maximum and low offset drift of 0.5 µV/°C maximum. The 130 dB CMRR figure minimizes errors when a sensor signal is small relative to its common-mode voltage. Current-feedback input circuitry preserves bandwidth at higher gain, including 200 kHz bandwidth at a gain of 100. Input bias current remains low at 5 nA maximum, which is valuable for high-impedance sensors.
The INA128P uses a versatile three-op-amp instrumentation-amplifier architecture and is available in an 8-pin plastic DIP package. Its ±2.25 V to ±18 V supply range supports dual-supply analog systems and higher-voltage industrial interfaces. The specified operating temperature range is -40 °C to +85 °C. The low 700 µA quiescent current helps reduce power consumption in portable and low-power measurement equipment.
Typical applications include bridge and strain-gauge signal conditioning, current measurement, biomedical instrumentation, industrial sensor interfaces, precision data acquisition, and laboratory measurement systems. The device is particularly suitable when common-mode rejection and low offset are more important than very high bandwidth. The manufacturer datasheet also identifies current-feedback input circuitry for improved high-gain bandwidth.
When designing around INA128P, choose the external gain resistor carefully because it determines gain accuracy and stability. Keep input and feedback routing compact, observe the specified supply limits, and verify common-mode voltage, input protection, and output-swing requirements against the actual sensor and measurement chain. The INA128P is not a power semiconductor, so safe-operating-area data is not applicable.
This page combines verified manufacturer specifications, distributor availability information, cross-reference results, and practical design guidance for engineers evaluating precision sensor-signal conditioning.
بدائل مباشرة لـ INA128P — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع INA128P (نفس عامل الشكل والبصمة) — يختلف في Package, Supply Voltage Range, Architecture, Mounting Type, Product Type.
INA129P
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←INA128PA
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←INA128U
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←AD620ARZ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←LT1168
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
INA128P الحدود القصوى والخصائص الكهربائية
| Product Type | Precision instrumentation amplifier |
| Architecture | Three-op-amp instrumentation amplifier |
| Common-Mode Rejection Ratio | 130 dB minimum |
| Offset Voltage | 50 µV maximum |
| Offset Voltage Drift | 0.5 µV/°C maximum |
| Input Bias Current | 5 nA maximum |
| Input Protection | ±40 V |
| Supply Voltage Range | ±2.25 V to ±18 V |
| تيار السكون | 700 µA |
| Bandwidth | 1.3 MHz |
| Bandwidth at Gain 100 | 200 kHz |
| Slew Rate | 4 V/µs |
| العلبة | 8-pin plastic DIP (PDIP) |
| درجة حرارة التشغيل | -40 °C to +85 °C |
| Input Type | Differential input |
| Manufacturer | Texas Instruments |
دليل تكوين أطراف INA128P 8-pin plastic dip (pdip)
تكوين الأطراف لـ INA128P (حزمة 8-pin plastic dip (pdip)). يتميز هذا المكوّن التناظري بأطراف الإدخال والإخراج وإمداد الطاقة. راجع ورقة بيانات الشركة المصنعة لتكوينات طرف إلغاء الإزاحة والتعويض والتمكين. مثالي لدوائر تكييف الإشارة والمضخمات.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ INA128P.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
INA128P مناسب لـ 6 التطبيقs: Strain-Gauge and Bridge Measurement, Precision Current Measurement, Biomedical Sensor Signal Conditioning, Industrial Pressure and Temperature Acquisition, Precision Data-Acquisition Front End, Portable and Low-Power Measurement Instruments.
Strain-Gauge and Bridge Measurement
The INA128P is well suited to strain-gauge and resistive-bridge front ends where small differential signals must be measured in the presence of a larger common-mode voltage. Its 130 dB CMRR helps reject common-mode variation, while 50 µV maximum offset voltage and 0.5 µV/°C maximum drift support accurate amplification near the bridge output. The 5 nA maximum input bias current is helpful for high-impedance sensor networks, and the three-op-amp architecture supports flexible gain selection. Designers should still verify bridge excitation voltage, input common-mode limits, gain-resistor accuracy, and output swing.
موصى به
Precision Current Measurement
INA128P can amplify the small differential voltage produced by a precision shunt or current-sensing element while suppressing common-mode voltage from the power path. The 130 dB CMRR and low 5 nA maximum input bias current are useful when the shunt is placed in a high-voltage or high-impedance environment. The device’s 700 µA quiescent current also helps when continuous monitoring is required. Confirm the shunt’s common-mode voltage, amplifier supply rails, input filtering, and output range before selecting the gain resistor.
موصى به
Biomedical Sensor Signal Conditioning
The INA128P is applicable to low-level biomedical sensor front ends that require differential amplification and good common-mode rejection. Its 50 µV maximum offset voltage and 0.5 µV/°C maximum drift can help preserve signal integrity in temperature-varying measurement systems, while the 130 dB CMRR supports operation when the sensor is referenced to a substantial common-mode voltage. The 5 nA maximum input bias current is valuable for high-impedance electrodes. Medical designs must additionally validate patient protection, isolation, leakage current, applicable standards, and safety requirements.
موصى به
Industrial Pressure and Temperature Acquisition
INA128P fits industrial pressure, temperature, and position sensor interfaces where transducers generate small differential signals over a common-mode range. The precision offset specification helps reduce measurement drift, and the wide ±2.25 V to ±18 V supply range supports both compact and higher-voltage analog systems. Its 1.3 MHz bandwidth is suitable for many slow-to-moderately-fast control and monitoring signals, though the selected gain must preserve adequate bandwidth. Engineer the input protection, grounding, shielding, calibration, and output-swing limits for the transducer environment.
موصى به
Precision Data-Acquisition Front End
INA128P can serve as the analog front end of a precision data-acquisition system when the source is differential and common-mode rejection is important. The three-op-amp architecture provides gain flexibility, and the 200 kHz bandwidth at gain 100 provides a useful performance level for many sensor signals. The low 700 µA quiescent current is suitable for distributed or portable measurement systems, although total power also depends on the external resistor network and support circuitry. Select the gain and filter network together, and verify ADC input range and acquisition timing.
موصى به
Portable and Low-Power Measurement Instruments
The 700 µA quiescent current makes INA128P a reasonable candidate for portable measurement instruments and low-power sensor interfaces. Its precision offset and CMRR characteristics help maintain measurement quality when the input signal is small or the sensor shares a noisy reference node. The device operates from ±2.25 V to ±18 V, allowing integration into dual-supply analog systems, but actual battery life depends on the complete circuit. Confirm low-power shutdown requirements, supply currents, leakage, and analog-signal bandwidth before finalizing a portable design.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ INA128P — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | INA129P | INA128PA | INA128U | AD620 | LT1168 |
|---|---|---|---|---|---|---|
| Package | 8-pin plastic DIP (PDIP) | 8-pin plastic DIP (PDIP) | 8-pin plastic DIP (PDIP) | 8-pin plastic DIP (PDIP) | 8-pin plastic DIP (PDIP) | 8-pin plastic DIP (PDIP) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Linear Technology |
أبرز الفروقات
- High common-mode rejection for precision differential measurements (مقابلAD620)
- Low-power operation for battery-influenced measurement systems (مقابلLT1168)
- Low offset and drift for sensor-amplification accuracy (مقابلINA129P)
- Input protection for field-facing sensor interfaces (مقابلINA128PA)
ملاحظات التصميم
Do not treat the ±40 V input-protection rating as the normal operating input range. The verified normal supply range is ±2.25 V to ±18 V, and the input common-mode and differential limits must be checked against the TI INA12x datasheet. Confirm protection behavior, leakage, supply sequencing, and external clamp requirements before connecting field-wired sensors.
Keep the instrumentation-amplifier input and feedback connections short and symmetric. Route differential inputs away from switching nodes and use a grounded guard or shield strategy appropriate to the sensor. Place input filtering close to the device when EMI is present, while accounting for filter capacitors interacting with source impedance and the amplifier’s frequency response.
Use a clean analog ground strategy and decouple the supply pins close to the package. The verified data does not provide a specific recommended capacitor network or PCB layout, so follow the TI datasheet and application guidance when those values become available. Preserve the differential pair geometry and avoid routing the gain-resistor network beneath or parallel to sensitive input traces.
معلومات الامتثال
The supplied verified data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for INA128P.
