TS97x is a low noise audio operational amplifier, which is used as a pre-amplifier for electret condenser microphones, with low distortion and high signal to noise ratio
This document details the implementation of the TS971 low-noise operational amplifier as a microphone pre-amplifier for Electret Condenser Microphones (ECM). It highlights the device's audio characteristics, such as low distortion and high gain bandwidth product, making it suitable for portable digital appliances.
The guide covers microphone considerations, including acoustic units and signal calculations, followed by component calculation steps. It provides a schematic for a non-inverting amplifier configuration, explains the design of high-pass and low-pass filters, and discusses EMI management for sensitive applications.
| Total Harmonic Distortion (THD) | 0.003% @ F=1kHz |
|---|---|
| Equivalent Input Noise Voltage | 4nV/sqrt(Hz) |
| 1/f Corner Frequency | 100Hz |
| Slew Rate | 4V/us |
| Gain Bandwidth Product | 12 MHz |
| Minimum Supply Voltage | 2.7V |
| Maximum Current Consumption (TS971) | 2.8mA |
| Maximum Current Consumption (Total) | 3.3mA |
The recommended load resistor is 2.2kΩ.
The sensitivity is -44dB +/- 5dB (0dB=1V/Pa).
It cuts frequencies above 33.8MHz to manage high power RF interferences.