INA101KU/1K - High Accuracy Instrumentation Amplifier | TI
MPN： INA101KU/1K ✓ 啟用中INA101KU/1K 概覽
An instrumentation amplifier is a specialized differential amplifier designed to amplify the difference between two input signals while rejecting common-mode voltage. Unlike a general-purpose operational amplifier, an instrumentation amplifier (in-amp) provides a fixed or gain-set internal architecture, very high input impedance, and high common-mode rejection, making it a key building block in the precision analog signal chain hierarchy: instrumentation amplifier -> precision amplifier -> analog front end -> signal conditioning system.
Key features include ultra-low input offset voltage of 25 uV max, low offset temperature drift of 0.25 uV/C max, nonlinearity of just 0.002%, and low input noise of 13 nV/sqrt(Hz). The device also provides high common-mode rejection at 60 Hz and very high input impedance of 10^10 ohms, which allows direct connection to high-impedance sources such as strain gauge bridges without loading errors.
The INA101 architecture integrates three internally matched operational amplifiers with a single external resistor setting the gain, preserving offset and drift performance across the gain range that would be difficult to achieve with discrete op-amp designs. Gain is configured via external resistor according to the manufacturer datasheet formula, enabling gains from 1 to over 1000 V/V.
Typical applications include strain gauge and weigh-scale bridge amplification, thermocouple and RTD temperature measurement front ends, industrial process-control signal conditioning, and medical biopotential acquisition where microvolt-level signals must be extracted in the presence of large common-mode interference such as 50/60 Hz mains hum.
When designing with the INA101KU/1K, keep gain-setting resistor traces short and use low-drift resistors to avoid degrading the intrinsic 0.25 uV/C offset drift. Careful grounding and a guard ring around the input pins preserve the high input impedance and CMR at 60 Hz.
This page synthesizes distributor pricing, verified drop-in alternatives, practical design notes, and application guidance not found in the manufacturer datasheet alone.
直接替換替代品，適用於 INA101KU/1K — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： INA101KU/1K （相同外形與佔位） — 差異在於 Gain Setting, Input Impedance, Package.
INA101KU
✅ 直接替換聯絡詢價
查看資料表 →INA101KUE4
✅ 直接替換📋 參考替代品（不在目錄中）
AD524ARZ-16
✅ 直接替換📋 參考替代品（不在目錄中）
INA101KU/1K 最大額定值與電氣特性
| Amplifier Type | Instrumentation Amplifier |
| Number of Circuits | 1 |
| Input Offset Voltage | 25 uV max |
| Offset Voltage Drift | 0.25 uV/C max |
| Nonlinearity | 0.002% max |
| Input Noise Density | 13 nV/sqrt(Hz) |
| Common-Mode Rejection | High CMR at 60 Hz |
| Input Impedance | 10^10 ohms |
| Settling Time | 30 us |
| 供應電流 | 10 mA |
| 封裝 | 16-pin SOIC (DW) |
| 安裝類型 | Surface Mount |
| Gain Setting | Single external resistor (RG) |
INA101KU/1K 16-pin soic (dw) 腳位配置指南
INA101KU/1K（16-pin soic (dw) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： INA101KU/1K.
請參閱 資料表 以查看完整腳位配置。
典型應用
INA101KU/1K 適用於 6 應用s: Strain Gauge Bridge Amplification, Thermocouple Temperature Measurement, Industrial Process Control Signal Conditioning, Weigh Scale and Load Cell Systems, Medical Biopotential Acquisition, Data Acquisition and Test Instrumentation.
Strain Gauge Bridge Amplification
The INA101KU/1K is a natural fit for strain gauge and load-cell bridge front ends because bridges deliver only microvolt-level differential signals riding on large common-mode excitation voltages. Its 25 uV maximum input offset and 0.25 uV/C maximum drift keep the zero-balance error small even after temperature excursions, while 0.002% nonlinearity preserves the linearity of the bridge itself at gains of several hundred V/V. The 10^10 ohm input impedance prevents the amplifier from loading the bridge and distorting the transfer curve. In use, the bridge outputs connect directly to the in-amp inputs with a single external resistor setting the gain, and the high CMR at 60 Hz rejects mains pickup from nearby industrial equipment, delivering a clean single-ended signal to the ADC.
推薦
Thermocouple Temperature Measurement
Type K and type J thermocouples produce roughly 41 uV/C and 52 uV/C respectively, so the front end must resolve microvolts without adding drift. The INA101KU/1K contributes only 25 uV maximum offset and 0.25 uV/C drift, which corresponds to a fraction of a degree of reading error after cold-junction compensation and calibration. The 13 nV/sqrt(Hz) input noise keeps the amplified signal clean at high gain, and high common-mode rejection at 60 Hz suppresses ground-loop and mains interference common in factory wiring. The device is wired as a fixed-gain differential stage between the thermocouple (with cold-junction sensor) and an ADC or V/F converter. Because the 10 mA supply current matters in multichannel racks, plan the thermal and power budget accordingly.
推薦
Industrial Process Control Signal Conditioning
In process control systems, transmitters and sensors such as pressure bridges, RTDs, and pH probes generate small differential signals over long, noisy cable runs. The INA101KU/1K addresses this with high common-mode rejection at 60 Hz, 10^10 ohm input impedance that tolerates source imbalance, and 0.002% maximum nonlinearity that preserves measurement linearity across the control range. Its 25 uV offset allows spanning full-scale with gains above 500 V/V while remaining within accuracy targets. The amplifier is placed at the receiving end of 4-20 mA shunt or direct differential sensor lines, with RC input filtering ahead of the pins for EMI. The 16-pin SOIC (DW) surface-mount package supports automated assembly in industrial control boards, and the single-resistor gain adjustment simplifies range calibration during production.
推薦
Weigh Scale and Load Cell Systems
Load cells used in weigh scales output on the order of 2 mV/V full scale, so at 10 V excitation the usable signal is about 20 mV - and individual resolution steps can be a few microvolts. The INA101KU/1K's 25 uV max offset and 0.25 uV/C drift let designers set high gain without unacceptable zero drift, and 13 nV/sqrt(Hz) noise preserves count resolution near the scale's legal-for-trade accuracy limits. The very high 10^10 ohm input impedance avoids loading errors from cable and bridge resistance tolerances. The amplifier sits between the load cell connector and the delta-sigma ADC, with a low-pass RC filter for 50/60 Hz rejection complementing the in-amp's CMR. Its SOIC-16 footprint and single-resistor gain scaling fit compact retail scale PCBs.
推薦
Medical Biopotential Acquisition
ECG and EEG front ends must extract microvolt-level biopotentials from bodies that float tens of millivolts to volts on mains-induced common-mode voltage. The INA101KU/1K's high common-mode rejection at 60 Hz, 13 nV/sqrt(Hz) low noise, and 10^10 ohm input impedance make it suitable for such acquisition front ends: electrodes connect through protection and filtering networks to the in-amp inputs, and the single external resistor sets gain in the hundreds of V/V. The 25 uV offset ensures baseline stability between electrode pairs. Designers should pair it with a driven-right-leg auxiliary amplifier to actively cancel common-mode voltage, add high-input-impedance input protection for defibrillation surge requirements, and verify all applicable medical electrical safety standards on the finished instrument.
推薦
Data Acquisition and Test Instrumentation
General-purpose data acquisition and bench instrumentation require a front end that is accurate, linear, and tolerant of common-mode ground differences between the source and the instrument. The INA101KU/1K provides 0.002% maximum nonlinearity and 25 uV offset, so it adds minimal error to a 12- to 16-bit digitizer chain, and its high CMR at 60 Hz rejects ground-loop hum between rack equipment. Programmable range switching is supported by reconfiguring the gain resistor with a relay or analog switch, using the single-resistor gain scheme. The 30 us settling time defines the channel-switch rate in multiplexed systems, so designers should allow settling time margin before each conversion. The SOIC-16 surface-mount package integrates cleanly into PCIE-sized DAQ boards.
推薦
推薦產品摘要
工程參考資料，適用於 INA101KU/1K — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | INA101KU | INA101KUE4 | AD524ARZ-16 |
|---|---|---|---|---|
| Package | 16-SOIC (DW) | 16-SOIC (DW) - same | 16-SOIC (DW) - same | 16-SOIC - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Pin-to-Pin Drop-In | - | Yes (same die) | Yes (same die) | Verify pin map against datasheet |
主要差異化特點
- Ultra-low offset drift preserves accuracy without trimming (對比AD524ARZ-16)
- Extremely high input impedance eliminates source loading (對比INA101AG)
- 0.002% nonlinearity protects system linearity at high gain (對比Discrete three-op-amp front end)
設計說明
The INA101KU/1K achieves its rated high CMR at 60 Hz only if both input paths are balanced. Match the series resistors and filter capacitors at pins for -IN and +IN to within 0.1%, and route both input traces symmetrically away from switching nodes. Any imbalance converts common-mode mains hum into a differential error that no amount of amplifier CMR can remove. Keep the gain resistor (RG) traces short and away from the input traces to avoid leakage and crosstalk.
Use a guard ring driven at the input common-mode potential around the high-impedance input pins to protect the 10^10 ohm input impedance from PCB leakage currents, especially in high-humidity environments. Place a 100 nF ceramic decoupling capacitor within 2 mm of each supply pin, plus a 10 uF bulk capacitor per board. A solid ground plane under the SOIC-16 (DW) package lowers return-path impedance; keep the analog ground return for the REF pin separate until a single star point.
Do not rely on the amplifier alone to fix a poor bridge: with 25 uV max offset and 0.25 uV/C drift, a gain of 500 V/V means up to 12.5 mV of output zero error, so budget for system calibration or use resistors with 0.1% tolerance for RG to control gain error. Also remember the 10 mA supply current per channel when designing multichannel or battery-powered instruments, and verify the REF pin is driven from a low-impedance source, not a resistor divider, to preserve CMR.
In multiplexed data acquisition systems, the 30 us settling time of the INA101KU/1K defines the maximum channel-switch rate. Allow at least 5 time constants of RC settling on the input filter plus the in-amp settling time before starting each ADC conversion. If faster scan rates are required, reduce the input filter bandwidth or consider a newer-generation in-amp with faster settling, accepting a PCB redesign trade-off.
合規資訊
Compliance status not stated in the provided verified web data; confirm RoHS/REACH status on the official TI product page at ti.com/product/INA101 before ordering.
