TS4974_07 Datasheet, PDF (1/25 Pages) STMicroelectronics – 1W differential audio power amplifier with up/down digital volume control pins

TS4974
1W differential audio power amplifier
with up/down digital volume control pins
Features
■ Operates from V_CC= 2.5 V to 5.5 V
■ Zero pop & click
■ 1 W output power @ V_CC = 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
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