Design contains obsolete parts

DEMOTS4909Q: Headphone Amp, 158mW @ 16Ω

Summary

This application note concerns the DEMOTS4909 evaluation board, designed to evaluate the TS4909 low power stereo headphone amplifier with capacitor-less output.

The TS4909 is a stereo audio amplifier designed to drive headphones in portable applications.

The integrated phantom ground is a circuit topology that eliminates the heavy output coupling capacitors. This is of primary importance in portable applications where space constraints are very high. A single-ended configuration is also available, offering even lower power consumption because the phantom ground can be switched off.

Specially designed for applications requiring low power supplies, the TS4909 is capable of delivering 52mW of continuous average power into a 32 Ohm load with less than 1% THD+N from a 3V power supply. Pop & click noise during switch-on and switch-off phases is eliminated thanks to integrated circuitry.

Specifications

Manufacturer	STMicroelectronics
Category	Audio Amplifiers
Eval Board Part Number	497-6380-ND
Eval Board Supplier	STMicroelectronics
Eval Board	Board not Stocked
Amplifier Type	Class AB
Number of Outputs	Stereo
Output Power (RMS) @ Load	52 mW @ 32 Ω (3V) 158 mW @ 16 Ω (5V)
Voltage In	2.2 ~ 5.5 V
THD+N (1kHz) @ Conditions	< 1% @ 158 mW (16 Ω, 5V) < 1% @ 52 mW (32 Ω, 3V)
Features	Filterless Output Shutdown, Enable, Standby Turn On/Off Depop
Efficiency @ Conditions	- Not Given
Standby Current [Typical]	10 nA
Quiescent Current [Typical]	2 mA
Component Count + Extras	8 + 6
Application / Target Market	Audio: MP3 Players Cell Phones Computers Digital Cameras Portable Devices RF: BlueTooth Headsets
Design Author	STMicroelectronics
Main I.C. Base Part	TS4909
Quiescent Current [Maximum]	4.8 mA
Standby Current [Maximum]	1 µA
Date Created By Author
Date Added To Library