TAS5704
www.ti.com
SLOS563A – MARCH 2008 – REVISED AUGUST 2010
20-W Stereo Digital Audio Power Amplifier With Feedback
Check for Samples: TAS5704
FEATURES
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Audio Input/Output
– 20-W into an 8-Ω Load From an 18-V Supply
– Two Serial Audio Inputs (Four Audio
Channels)
– Supports Multiple Output Configurations:
– 2-Ch Bridged Outputs (20 W × 2)
– 4-Ch Single-Ended Outputs (10 W × 4)
– 2-Ch Single-Ended + 1-Ch Bridged (2.1)
(10 W × 2 + 20 W)
Closed Loop Power Stage Architecture
– Improved PSRR Reduces Power Supply
Performance Requirements
– Higher Damping Factor Provides for
Tighter, More Accurate Sound With
Improved Bass Response
– Lower EMC Emissions
– Output Power is Independent of Supply
Voltage Variation
Wide PVCC Range From (10 V to 26 V)
Supports 32-kHz–192-kHz (DVD-Audio) Sample
Rates (LJ/RJ/I2S)
Line-Level Subwoofer PWM Outputs
Audio/PWM Processing (Hardware Controlled)
– 4-Step Gain Control (-3dB, 3dB, 9dB, 12dB)
– Soft Mute Control (50% Output Duty Cycle)
Factory-Trimmed Internal Oscillator Enables
Automatic Detection of Incoming Sample
Rates
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Thermal and Short-Circuit Protection
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DESCRIPTION
The TAS5704 is a 20-W, efficient, digital audio power
amplifier for driving stereo bridge-tied speakers. Two
serial data inputs allow processing of up to four
discrete audio channels and seamless integration to
most digital audio processors accepting a wide range
of input data and clock rates. A hardware
configurable data path allows these channels to be
routed to the internal speaker drivers or output via the
subwoofer PWM outputs.
The TAS5704 is a slave-only device receiving all
clocks from external sources. The TAS5704 operates
at a 384-kHz switching rate for 32-, 48-, 96-, and
192-kHz data, and at a 352.8 kHz switching rate for
44.1-, 88.2-, and 176.4-kHz data. The 8×
oversampling combined with the fourth-order noise
shaper provides a flat noise floor and excellent
dynamic range from 20 Hz to 20 kHz.
The closed-loop architecture of the TAS5704
provides several benefits. The high power supply
rejection enables superior audio performance from a
noisy, low cost supply. The high damping factor
allows tighter control over speaker movement
resulting in an improved bass response. Finally,
switching edge rate control lowers EMC emissions
without sacrificing audio performance.
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
System Two, Audio Precision are trademarks of Audio Precision, Inc.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2010, Texas Instruments Incorporated
