Overview
The INA137UA/2K5, produced by Texas Instruments, is a single-channel, audio differential line receiver. It is part of the INA137 series, which includes high-performance operational amplifiers with on-chip precision resistors. These devices are designed for high-performance audio applications, offering excellent AC specifications such as low distortion and high slew rates. The INA137UA/2K5 is available in an 8-pin SOIC (D) package and is specified for operation over the extended industrial temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage Range | ±4 | ±18 | V | |
| Quiescent Current (per Amplifier) | 2.4 | 2.9 | mA | |
| Common-Mode Rejection Ratio (CMRR) | 74 | 90 | dB | |
| Differential Input Impedance | 24 | kΩ | ||
| Common-Mode Input Impedance | 18 | kΩ | ||
| Gain Error | ±0.01 | ±0.1 | % | |
| Distortion (THD+Noise) at 1kHz | 0.0005 | % | ||
| Slew Rate | 14 | V/µs | ||
| Settling Time to 0.01% | 3 | µs | ||
| Operating Temperature Range | –40 | +85 | °C | |
| Storage Temperature Range | –55 | +125 | °C |
Key Features
- Low Distortion: 0.0005% at 1kHz, ensuring high-quality audio performance.
- High Slew Rate: 14V/µs for excellent dynamic response.
- Fast Settling Time: 3µs to 0.01% for rapid signal recovery.
- Wide Supply Range: Operates from ±4V to ±18V, providing flexibility in power supply design.
- Low Quiescent Current: Maximum of 2.9mA per amplifier, reducing power consumption.
- High CMRR: Typically 90dB, ensuring good common-mode rejection.
- Fixed Gain: Available in ±6dB configurations (G = 1/2 or G = 2).
- Independent Circuitry: In the dual version (INA2137), each channel operates independently to minimize crosstalk.
Applications
- Audio Differential Line Receiver: Ideal for high-quality audio applications requiring low distortion and high dynamic range.
- Instrumentation Building Block: Useful in various instrumentation applications due to its high precision and low noise characteristics.
- Current Shunt Monitor: Can be used to monitor current in high-precision applications.
- Voltage-Controlled Current Source: Suitable for applications requiring precise current control.
- Ground Loop Eliminator: Helps in eliminating ground loops in audio and instrumentation systems.
Q & A
- What is the typical distortion of the INA137UA/2K5 at 1kHz?
The typical distortion is 0.0005% at 1kHz.
- What is the slew rate of the INA137UA/2K5?
The slew rate is 14V/µs.
- What is the operating temperature range of the INA137UA/2K5?
The operating temperature range is –40°C to +85°C.
- What are the available gain configurations for the INA137UA/2K5?
The available gain configurations are G = 1/2 (–6dB) and G = 2 (+6dB).
- What is the maximum quiescent current per amplifier for the INA137UA/2K5?
The maximum quiescent current per amplifier is 2.9mA.
- What is the typical common-mode rejection ratio (CMRR) of the INA137UA/2K5?
The typical CMRR is 90dB.
- What are the package options for the INA137UA/2K5?
The INA137UA/2K5 is available in an 8-pin SOIC (D) package.
- How does the INA137UA/2K5 handle common-mode rejection?
The device features laser-trimmed matched resistors for optimum common-mode rejection, and it maintains good common-mode rejection over temperature.
- Can the INA137UA/2K5 be used in high-impedance power supply applications?
Yes, but decoupling capacitors are strongly recommended to be placed close to the device pins to ensure stable operation.
- What are some typical applications of the INA137UA/2K5?
Typical applications include audio differential line receivers, instrumentation building blocks, current shunt monitors, voltage-controlled current sources, and ground loop eliminators.
