Overview
The INA117P-BI, produced by Texas Instruments, is a precision unity-gain difference amplifier designed to handle high common-mode input voltage ranges. This device is a single monolithic IC that includes a precision op amp and an integrated thin-film resistor network. It is capable of accurately measuring small differential voltages in the presence of common-mode signals up to ±200V. The INA117P-BI 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 and their associated noise and quiescent current.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Common-mode input range | ±200V | V |
| Protected inputs (Common-mode/Differential) | ±500V | V |
| Gain error | 0.05% | % |
| Nonlinearity | 0.001% | % |
| CMRR (Common-mode rejection ratio) | 70dB (min) | dB |
| Differential input impedance | 800 kΩ | Ω |
| Common-mode input impedance | 200 kΩ | Ω |
| Voltage noise (RTO, fB = 0.1Hz to 10Hz) | 25 µVPP | µVPP |
| Voltage noise (RTO, f = 1kHz) | 550 nV/√Hz | nV/√Hz |
| Output voltage (IO = 20mA, –5mA) | 10 - 12 V | V |
| Output impedance | 0.01 Ω | Ω |
| Load capacitance for stable operation | 1 nF | nF |
| Short-circuit current | 49, –13 mA | mA |
| Bandwidth, –3dB | 200 kHz | kHz |
| Full power bandwidth (VO = 20Vpp) | 30 kHz | kHz |
| Slew rate | 1.7 - 2.6 V/µs | V/µs |
| Settling time (To 0.1%, VO = 10V step) | 6.5 µs | µs |
| Settling time (To 0.01%, VO = 10V step) | 10 µs | µs |
| Quiescent current (VIN = 0V) | 1.5 ± 2 mA | mA |
Key Features
- High Common-Mode Input Range: The INA117P-BI can handle common-mode input voltages up to ±200V, making it suitable for applications with high common-mode signals.
- Protected Inputs: The device is protected from momentary common-mode or differential overloads up to ±500V, enhancing its robustness in harsh environments.
- Unity Gain and Low Nonlinearity: The amplifier offers a unity gain with a maximum gain error of 0.05% and nonlinearity of 0.001%, ensuring high accuracy in differential voltage measurements.
- High CMRR: The common-mode rejection ratio is at least 70dB, which is crucial for rejecting common-mode signals and maintaining signal integrity.
- Low Output Impedance and High Bandwidth: The device features a low output impedance of 0.01 Ω and a bandwidth of 200 kHz, making it suitable for a variety of high-speed applications.
Applications
- Single Multi-Axis Servo Drives: The INA117P-BI is used in servo drive systems where precise measurement of differential voltages is critical.
- Industrial Machine and Machine Tools: It is applied in industrial settings for monitoring and control purposes, where high common-mode voltages are common.
- Semiconductor Test and ATE: The device is utilized in automated test equipment for semiconductor testing due to its high precision and robustness.
- Ultrasound Scanners: It is used in medical devices such as ultrasound scanners where accurate signal measurement is essential.
- Current Monitoring and Battery Cell-Voltage Monitoring: The INA117P-BI is also used in current monitoring and battery cell-voltage monitoring applications due to its ability to handle high common-mode voltages.
Q & A
- What is the common-mode input range of the INA117P-BI?
The common-mode input range of the INA117P-BI is ±200V. - How are the inputs of the INA117P-BI protected?
The inputs are protected from momentary common-mode or differential overloads up to ±500V. - What is the gain error and nonlinearity of the INA117P-BI?
The gain error is a maximum of 0.05%, and the nonlinearity is a maximum of 0.001%. - What is the CMRR of the INA117P-BI?
The common-mode rejection ratio (CMRR) is at least 70dB. - What are the typical applications of the INA117P-BI?
Typical applications include single multi-axis servo drives, industrial machine and machine tools, semiconductor test and ATE, and ultrasound scanners. - What is the bandwidth of the INA117P-BI?
The bandwidth of the INA117P-BI is 200 kHz. - What is the output impedance of the INA117P-BI?
The output impedance is 0.01 Ω. - How does the INA117P-BI handle high common-mode signals?
The device can accurately measure small differential voltages in the presence of common-mode signals up to ±200V. - What are the temperature ranges for the INA117P-BI?
The device is specified for the –40°C to +85°C temperature range, with some models available for –55°C to +125°C. - What are the package options for the INA117P-BI?
The INA117P-BI is available in 8-pin plastic mini-DIP and SO-8 surface-mount packages.[
