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TS4974IQT

1W differential audio power amplifier with up/down digital volume control pins

STMicroelectronics 

TS4974

1W differential audio power amplifier

with up/down digital volume control pins

Features

■ Operates from VCC= 2.5 V to 5.5 V

■ Zero pop & click

■ 1 W output power @ VCC = 5 V, THD = 1%,

F = 1 kHz, with 8 Ω load

■ Ultra-low consumption in standby mode (2 µA

max.)

■ 85 dB PSRR @ 217Hz

■ 16-step digital volume control

■ Two discrete up and down volume control pins

■ Gain range from -33 dB to + 12 dB

■ Integrated debouncing system

■ Ultra-fast start-up time: 15 ms typ.

■ DFN10 3x3 mm (pitch 0.5)

Applications

■ Mobile phones (cellular / cordless)

■ PDAs

■ Laptop/notebook computers

■ Portable audio devices

Description

At 3.3 V, the TS4974 is a dual power audio

amplifier capable of delivering 380 mW of

continuous RMS output power into a 8 Ω bridged-

tied loads with 1% THD+N. An external standby

mode control reduces the supply current to less

than 2 µA. An internal over-temperature shutdown

protection is provided.

The TS4974 has been designed for high quality

audio applications such as mobile phones and

minimizes the number of external components

necessary.

DFN10 (3x3)

Pin connections (top view)

VIN- 1

VIN+ 2

BYPASS 3

STANDBY 4

GND 5

10 VCC

9 VOUT-

8 VOUT+

7 UP / DVC

6 DOWN / DVC

The TS4974 features 16-step digital volume

control through two discrete Up and Down control

pins. The start-up gain is internally fixed to

-12 dB. An integrated debounce system prevents

voltage spikes on the UP/DOWN pins during

volume control mode from being taken into

account during a debounce time of 10 ms (typ).

May 2007

Rev 4

1/25

www.st.com

25

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