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SLOS606 – AUGUST 2008
20-W Stereo Digital Audio Power Amplifier with EQ and DRC
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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)
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Supports 32-kHz–192-kHz Sample Rates
(LJ/RJ/I
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S)
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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
– Constant Output Power Over Variation in
Supply
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Wide PVCC Range From (10 V to 26 V)
– No Separate Supply Required for Gate
Drive
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Headphone PWM Outputs
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Subwoofer PWM Outputs
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AM Interference Avoidance Support
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Audio/PWM Processing
– Independent Channel Volume Controls With
48-dB to –100-dB Range—Soft Mute (50%
Duty Cycle)
– Programmable Dynamic Range Control
– 7 Programmable Biquads for Speaker
Equalization for Left and Right Channels
– 4 Programmable Biquads for Bass
Processing
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– Adaptive Biquad Coefficients for EQ and
DRC Filters
– Programmable Input and Output Mixers
– Automatic Sample-Rate Detection and
Coefficient Banking
General Features
– Serial Control Interface Operational Without
MCLK
– Factory-Trimmed Internal Oscillator Avoids
the Need for External Crystal
– Surface Mount, 64-Terminal, 10-mm ×
10-mm HTQFP Package
– Thermal and Short-Circuit Protection
DESCRIPTION
The TAS5706A is a 20-W, efficient, digital audio
power amplifier for driving stereo bridged-tied
speakers. Two serial data inputs allow processing of
up to four discrete audio channels and seamless
integration to most digital audio processors and
MPEG decoders, accepting a wide range of input
data and clock rates. A fully programmable data path
allows these channels to be routed to the internal
speaker drivers or output via the subwoofer or
headphone PWM outputs.
The TAS5706A is a slave-only device receiving all
clocks from external sources. The TAS5706A
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.
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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.
PurePath Digital is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
Copyright © 2008, Texas Instruments Incorporated
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.
TI [ TEXAS INSTRUMENTS ]
