This is an application note for the DEMOTS4909 evaluation board, which is designed to evaluate the TS4909 low power stereo headphone amplifier with capacitor-less output.
This application note concerns the DEMOTS4909 evaluation board, which is designed to evaluate the TS4909 low power stereo headphone amplifier with capacitor-less output. The document provides a brief description of the TS4909 audio amplifier, highlighting its ability to drive headphones in portable applications with low power consumption and integrated phantom ground circuitry.
| Output power (5V, 16Ω) | 158mW @5V, into 16Ω with 1% THD+N max (1kHz) |
|---|---|
| Output power (3V, 32Ω) | 52mW @3.0V into 32Ω with 1% THD+N max (1kHz) |
| Operating voltage range | 2.2V to 5.5V |
| Current consumption (typical) | 2.0mA typ.@3V |
| Standby consumption (typical) | 10nA typ. |
| Signal-to-noise ratio | 105dB typ. @5V |
| Crosstalk immunity | 110dB (F=1kHz) |
| PSRR | 72dB (F=1kHz), inputs grounded |
| Package | DFN10 3x3mm |
The board is designed to evaluate the TS4909 low power stereo headphone amplifier with capacitor-less output.
The gain is set at 1 V/V for both channels and can be adapted by modifying the values of resistors R1, R2, R3, or R4.
Inverting the polarity when applying power through connector P2 would destroy the amplifier at U1.