TPA0142 Datasheet, PDF (1/30 Pages) Texas Instruments – 2-W STEREO AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL

D Compatible With PC 99 Desktop Line-Out
Into 10-kΩ Load
D Compatible With PC 99 Portable Into 8-Ω
Load
D Internal Gain Control, Which Eliminates
External Gain-Setting Resistors
D DC Volume Control From 20 dB to –40 dB
D 2-W/Ch Output Power Into 3-Ω Load
D PC-Beep Input
D Depop Circuitry
D Stereo Input MUX
D Fully Differential Input
D Low Supply Current and Shutdown Current
D Surface-Mount Power Packaging
24-Pin TSSOP PowerPAD™
TPA0142
2-W STEREO AUDIO POWER AMPLIFIER
WITH DC VOLUME CONTROL
SLOS248B – JUNE 1999 – REVISED MARCH 2000
PWP PACKAGE
(TOP VIEW)
GND
1
PCB ENABLE
2
VOLUME
3
LOUT+
4
LLINEIN
5
LHPIN
6
PV_DD
7
RIN
8
LOUT–
9
LIN
10
BYPASS
11
GND
12
24
GND
23
RLINEIN
22
SHUTDOWN
21
ROUT+
20
RHPIN
19
V_DD
18
PV_DD
17
CLK
16
ROUT–
15
SE/BTL
14
PC-BEEP
13
GND
description
The TPA0142 is a stereo audio power amplifier in a 24-pin TSSOP thermally enhanced package capable of
delivering 2 W of continuous RMS power per channel into 3-Ω loads. This device minimizes the number of
external components needed, which simplifies the design and frees up board space for other features. When
driving 1 W into 8-Ω speakers, the TPA0142 has less than 0.22% THD+N across its specified frequency range.
Included within this device is integrated depop circuitry that virtually eliminates transients that cause noise in
the speakers.
Amplifier gain is controlled by a dc voltage input on the VOLUME terminal. There are 31 discrete steps covering
the range of 20 dB (maximum volume setting) to –40 dB (minimum volume setting) in 2 dB steps. When the
VOLUME terminal exceeds 3.54 V, the device is muted. An internal input MUX allows two sets of stereo inputs
to the amplifier. In notebook applications, where internal speakers are driven as BTL and the line outputs (often
headphone drive) are required to be SE, the TPA0142 automatically switches into SE mode when the SE/BTL
input is activated, and this effectively reduces the gain by 6 dB.
The TPA0142 consumes only 20 mA of supply current during normal operation. A miserly shutdown mode
reduces the supply current to less than 150 µA.
The PowerPAD package (PWP) delivers a level of thermal performance that was previously achievable only
in TO-220-type packages. Thermal impedances of approximately 35°C/W are truly realized in multilayer PCB
applications. This allows the TPA0142 to operate at full power into 8-Ω loads at ambient temperatures of 85°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments Incorporated.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright © 2000, Texas Instruments Incorporated
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