This document provides user guidelines for the evaluation board DEMOTS488/9, which is designed to evaluate the TS488 or TS489 low power stereo headphone amplifier. The TS488/9 is an enhancement of TS486/487 and eliminates pop & click noise. It is a dual audio power amplifier capable of driving a 16Ω or 32Ω stereo headset in single-ended mode. It can deliver up to 31mW per channel (into 16Ω loads) of continuous average power with 0.1% THD+N in the audio bandwidth from a 2.5V power supply. The TS488/9 features externally-controlled standby mode, low current consumption, high signal-to-noise ratio, high crosstalk immunity, and high PSRR.
This document serves as a user guide for the DEMOTS488/9 evaluation board, which is designed to evaluate the TS488 or TS489 pop-free 120mW stereo headphone amplifier. The note includes a brief description of the amplifier's features and specifications.
| Operating voltage range | 2.2V to 5.5V |
|---|---|
| Output power @5V into 16Ω | 120mW |
| Output power @3.3V into 16Ω | 55mW |
| Supply current (max) | 2.7mA |
| Standby current (typical) | 10nA |
| Crosstalk immunity | 102dB |
This application note concerns the evaluation board DEMOTS488/9, designed to evaluate the TS488 or TS489 pop-free 120mW stereo headphone amplifier.
The gain (Ay) is set at 1 V/V for both channels by default, but can be adapted by modifying R11 or R12 values for channel 1 and R21 or R22 values for channel 2.