Overview
The INA117KUG4, produced by Texas Instruments, is a precision unity-gain difference amplifier designed to accurately measure small differential voltages in the presence of high common-mode signals. This device is part of the INA117 family and is available in an 8-pin SOIC package. It features a high common-mode input voltage range of up to ±200V and input protection against momentary common-mode or differential overloads up to ±500V. The INA117 is particularly useful in applications where galvanic isolation is not essential, allowing it to replace isolation amplifiers and eliminate the need for costly isolated input-side power supplies.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Offset Voltage (RTO, P package) | 120 | 1000 | 1000 | µV |
| Offset Voltage (RTO, KU package) | 600 | 2000 | 2000 | µV |
| Offset Voltage Drift | 8.5 | µV/°C | ||
| Long Term Drift | 200 | µV/mo | ||
| Power-Supply Rejection Ratio | 74 | 90 | 90 | dB |
| Common-Mode Voltage Range | -200 | 200 | V | |
| Differential Voltage Range | -10 | 10 | V | |
| Common-Mode Rejection Ratio (CMRR) | 70 | 80 | 80 | dB |
| Differential Input Impedance | 800 | kΩ | ||
| Common-Mode Input Impedance | 200 | kΩ | ||
| Gain Error | -0.01 | 0.05 | % | |
| Gain Nonlinearity | -0.0005 | 0.001 | % of FSR | |
| Output Voltage | 12 | V | ||
| Output Impedance | 0.01 | Ω | ||
| Bandwidth (-3dB) | 200 | kHz | ||
| Slew Rate | 1.7 | 2.6 | 2.6 | V/µs |
| Settling Time (to 0.1%) | 6.5 | µs | ||
| Quiescent Current | 1.5 | 2 | mA |
Key Features
- High common-mode input voltage range: up to ±200V
- Input protection against momentary common-mode or differential overloads up to ±500V
- Unity gain with 0.05% maximum gain error and 0.001% maximum nonlinearity
- High common-mode rejection ratio (CMRR): minimum 70dB
- Bandwidth: 200kHz, full power bandwidth: 30kHz
- Low noise: 550nV/√Hz at 1kHz
- Available in 8-pin SOIC package with a temperature range of –40°C to 85°C
Applications
- Single multi-axis servo drives
- Industrial machines and machine tools
- Semiconductor test and ATE (Automated Test Equipment)
- Ultrasound scanners
- Current sensing and measurement
- High-impedance signal amplification
Q & A
- What is the common-mode input voltage range of the INA117? The INA117 has a common-mode input voltage range of up to ±200V.
- What is the maximum gain error of the INA117? The maximum gain error of the INA117 is 0.05%.
- How is the input protection of the INA117? The INA117 inputs are protected from momentary common-mode or differential overloads up to ±500V.
- What is the typical bandwidth of the INA117? The typical bandwidth of the INA117 is 200kHz.
- What are the package options for the INA117? The INA117 is available in 8-pin plastic mini-DIP and SO-8 surface-mount packages.
- What is the operating temperature range of the INA117? The operating temperature range of the INA117 is –40°C to 85°C.
- How does the INA117 handle noise? The INA117 has a low noise performance, with approximately 550nV/√Hz at 1kHz, and noise can be further reduced with a low-pass filter.
- Can the INA117 be used for current measurement? Yes, the INA117 can be used to measure current by sensing the voltage drop across a series resistor.
- What is the common-mode rejection ratio (CMRR) of the INA117? The CMRR of the INA117 is a minimum of 70dB.
- How does the INA117 improve signal-to-noise ratio? The INA117 can improve signal-to-noise ratio by adding gain ahead of the amplifier, which also allows for a lower voltage drop across the sense resistor.
