INA105AM - Unity-Gain Differential Amplifier | Texas Instruments
料号： INA105AM ✓ 量产中INA105AM 概述
A differential amplifier is an analog signal-conditioning circuit that subtracts one input voltage from another. By rejecting signals common to both inputs and amplifying the remaining difference, it supports accurate measurement in systems where the useful signal is small relative to a larger common-mode voltage. The INA105 belongs to the operational-amplifier and instrumentation-amplifier hierarchy within analog and power-management electronics.
Laser trimming of the internal resistor network provides accurate unity gain without external gain-setting resistors. The matching temperature coefficient of the network helps preserve gain accuracy and common-mode rejection as temperature changes. These characteristics make the INA105AM useful when a differential signal must be converted into a single-ended voltage with low gain error and high rejection of shared noise or interference.
Typical uses include instrumentation, bridge-amplifier interfaces, current-sense signal conditioning, precision amplifier front ends, and measurement systems in which both input sources operate around a common voltage. The TO-99 package provides a mechanically robust through-hole form factor for industrial and laboratory equipment, although the larger package is less compact than an SOIC-8 implementation.
The principal design consideration is input-voltage compatibility. The input common-mode range, supply limits, input bias current, and output swing must be checked against the signal source before deployment. Decoupling capacitors should be placed close to the supply pins, and source impedances should be balanced when maximum common-mode rejection is required. The manufacturer datasheet should be used for the complete pin description and electrical limits.
This page combines the manufacturer device description, package information, verified specifications, and engineering guidance to clarify selection and implementation. It also distinguishes the documented INA105AM ordering option from alternatives that require a package or electrical review before substitution.
直接替换替代料： INA105AM ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料INA105AM 最大额定值与电气特性
| Product Type | Precision unity-gain differential amplifier |
| Number of Circuits | 1 circuit |
| Nominal Gain | 1 V/V |
| Common-Mode Rejection | 86 dB minimum over temperature |
| Gain Error | 0.01% maximum |
| Nonlinearity | 0.001% maximum |
| Internal Adjustment | No external adjustments required |
| Amplifier Architecture | Precision operational amplifier with on-chip metal-film resistor network |
| Resistor Trimming | Laser trimmed |
| Small-Signal Bandwidth | 1 MHz |
| 封装 | TO-99-8 metal package, 8 pins |
| 安装类型 | Through-hole |
INA105AM to-99-8 metal package, 8 pins 引脚配置指南
INA105AM（to-99-8 metal package, 8 pins 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： INA105AM.
请参阅 数据手册 以查看完整引脚配置。
典型应用
INA105AM 适用于 6 应用s: Precision Bridge-Amplifier Front Ends, Current-Sense Signal Conditioning, Industrial Process-Control Inputs, Precision Sensor Interfaces, Laboratory Instrumentation, Audio and Communication Interfaces.
Precision Bridge-Amplifier Front Ends
The INA105AM fits precision bridge measurements because its nominal gain of 1, gain error of 0.01% maximum, and common-mode rejection of 86 dB minimum over temperature help isolate the small differential bridge output. The monolithic amplifier and laser-trimmed resistor network eliminate a discrete four-resistor gain stage that would require individual matching. Place the device close to the bridge, keep input traces symmetric, and confirm that the bridge common-mode voltage remains inside the manufacturer's input range. Its 1 MHz bandwidth supports measurements where adequate settling time is maintained.
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Current-Sense Signal Conditioning
INA105AM can condition a differential voltage produced by a current-sense element while rejecting the larger common-mode voltage present across the shunt. Its 86 dB minimum common-mode rejection over temperature improves immunity to shared supply or ground disturbances, while the 0.01% maximum gain error limits scale-factor error. The unity-gain device requires no external gain-setting network. Maintain matched source impedances, observe the input common-mode limits, and avoid exceeding the output swing when the measured current approaches the end of the shunt amplifier's range.
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Industrial Process-Control Inputs
The INA105AM is appropriate for industrial process-control front ends that receive a small differential sensor signal superimposed on a larger common-mode voltage. Its precision unity gain, laser-trimmed internal network, and 0.001% maximum nonlinearity help preserve measurement fidelity before a downstream converter or controller. The TO-99-8 metal package supports robust through-hole assembly, but the circuit must remain within the documented supply and common-mode limits. Balanced routing, local decoupling, and protection against industrial surge events are essential for reliable field performance.
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Precision Sensor Interfaces
INA105AM can serve as the differential input stage for sensors whose output is centered around a mid-supply voltage rather than ground. Common-mode rejection of 86 dB minimum over temperature reduces errors from signals shared by both sensor outputs, and the internal trimmed network provides predictable unity gain without manual calibration. Use symmetric input routing and verify source impedance matching for maximum rejection. Confirm that sensor output excursions remain within the input common-mode range and that downstream circuitry accepts the resulting single-ended voltage.
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Laboratory Instrumentation
The INA105AM provides a compact precision differential stage for laboratory instruments that must reject common-mode voltage and preserve signal amplitude accurately. The 0.01% maximum gain error and 0.001% maximum nonlinearity support reproducible measurements, while the TO-99 package is straightforward to socket or mount in laboratory-oriented through-hole boards. Keep analog input paths away from switching nodes and digital clocks, establish a clean reference return, and follow the manufacturer pin and grounding recommendations. Confirm bandwidth, slew rate, and output-swing requirements for the intended measurement bandwidth.
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Audio and Communication Interfaces
INA105AM can be used at the analog input of communication or audio equipment when a balanced source must be converted to a single-ended signal with stable unity gain. Its 86 dB minimum common-mode rejection over temperature helps suppress common-mode hum and coupled interference, while the trimmed internal network simplifies channel matching. The 1 MHz bandwidth is suitable for many low-frequency audio and control interfaces but should be checked against higher-bandwidth channels. Preserve balanced routing, use clean grounding, and avoid clipping at the output.
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推荐产品汇总
工程参考数据： INA105AM ——对比、设计指导和合规信息。
选型指南
设计说明
Do not treat every INA105 ordering option as interchangeable. INA105AM is specified in TO-99-8, whereas the family also includes SOIC and plastic-DIP versions. Before substitution, compare the manufacturer pin table, footprint, supply limits, input common-mode range, temperature grade, and ordering suffix. A change from TO-99-8 to SOIC-8 requires PCB and assembly changes and is therefore not a drop-in replacement.
Route the two INA105AM inputs symmetrically and keep them away from switching nodes, high-current returns, and digital clock traces. Source-impedance mismatch can reduce common-mode rejection even when the device meets its 86 dB minimum specification. Place the required power-decoupling capacitors close to the device pins and provide a low-impedance return path so differential signals are not contaminated by ground-current differences.
Use the INA105AM's 1 MHz bandwidth as an upper design consideration and confirm that required signal bandwidth, settling time, and slew rate remain acceptable. For slow measurements, add only the filtering needed to control noise because excessive low-pass filtering can slow settling. For higher-frequency channels, verify that source capacitance, load capacitance, gain-bandwidth behavior, and output-swing requirements satisfy the manufacturer limits.
合规信息
The manufacturer page identifies INA105 as an 8-pin plastic DIP, SOIC, and TO-99 metal package family. Specific INA105AM compliance declarations were not present in the retrieved manufacturer descriptions, so each field remains unknown rather than inferred.
