Overview
The INA117KU/2K5, produced by Texas Instruments, is a precision unity-gain difference amplifier designed to handle high common-mode input voltages. 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 INA117KU/2K5 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 | Min | Typ | Max | Units |
|---|---|---|---|---|
| Common-mode Input Range | ±200 | V (VS = ±15V) | ||
| Protected Inputs | ±500 | V (Common-mode and Differential) | ||
| Gain Error | 0.01 | 0.05 | % | |
| Nonlinearity | 0.0002 | 0.001 | % of FSR | |
| CMRR | 70 | 86 | dB | |
| Bandwidth, -3dB | 200 | kHz | ||
| Full Power Bandwidth | 30 | kHz (VO = 20Vpp) | ||
| Slew Rate | 1.7 | 2.6 | V/µs | |
| Settling Time | 6.5 | 10 | µs (To 0.1% and 0.01%, VO = 10V step) | |
| Quiescent Current | 1.5 | 2 | mA (VIN = 0V) | |
| Temperature Range | -40 | 85 | °C |
Key Features
- High Common-mode Input Range: Up to ±200V (VS = ±15V)
- Protected Inputs: Momentary common-mode or differential overloads up to ±500V
- Unity Gain: 0.05% maximum gain error
- Nonlinearity: 0.001% maximum
- CMRR: Minimum 70dB common-mode rejection ratio
- Bandwidth: 200kHz bandwidth, -3dB
- Package Options: Available in 8-pin plastic mini-DIP and SO-8 surface-mount packages
- Temperature Range: Specified for the -40°C to 85°C temperature range
Applications
- Single Multi-Axis Servo Drives: For precise control and measurement in servo systems
- Industrial Machines and Machine Tools: For monitoring and control in industrial environments
- Semiconductor Test and ATE: For accurate voltage measurements in test equipment
- Ultrasound Scanners: For signal acquisition in medical devices
- Current Monitoring: For measuring current in various applications
- Battery Cell-Voltage Monitoring: For monitoring battery voltages in battery management systems
- Ground Breaker and Input Protection: For protecting against overloads and ground faults
- Signal Acquisition in Noisy Environments: For reliable signal measurement in noisy conditions
- Factory Automation: For various automation tasks requiring precise voltage measurements
Q & A
- What is the common-mode input range of the INA117KU/2K5?
The common-mode input range is up to ±200V (VS = ±15V).
- How are the inputs of the INA117KU/2K5 protected?
The inputs are protected from momentary common-mode or differential overloads up to ±500V.
- What is the maximum gain error of the INA117KU/2K5?
The maximum gain error is 0.05%.
- What is the nonlinearity of the INA117KU/2K5?
The nonlinearity is 0.001% maximum.
- What is the common-mode rejection ratio (CMRR) of the INA117KU/2K5?
The CMRR is a minimum of 70dB.
- What is the bandwidth of the INA117KU/2K5?
The bandwidth is 200kHz, -3dB.
- In what packages is the INA117KU/2K5 available?
The INA117KU/2K5 is available in 8-pin plastic mini-DIP and SO-8 surface-mount packages.
- What is the operating temperature range of the INA117KU/2K5?
The operating temperature range is -40°C to 85°C.
- Can the INA117KU/2K5 replace isolation amplifiers in some applications?
Yes, in many applications where galvanic isolation is not essential, the INA117KU/2K5 can replace isolation amplifiers.
- How can the INA117KU/2K5 be used for current measurement?
The INA117KU/2K5 can be used to measure current by sensing the voltage drop across a series resistor.
