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SLOS549 – JUNE 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
– Wide Power-Supply Range From (8 V
to 23 V)
– Efficient Class-D Operation Eliminates
Need for Heat Sinks
– Requires Only Two Power-Supply Rails
– Two Serial Audio Inputs (Four Audio
Channels)
– Supports 32-kHz–192-kHz Sample Rates
(LJ/RJ/I
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S)
– Headphone PWM Outputs
– Subwoofer PWM Outputs
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Audio/PWM Processing
– Independent Channel Volume Controls With
24-dB to –100-dB Range
– Soft Mute (50% Duty Cycle)
– Programmable Dynamic Range Control
– 16 Adaptable Biquads for Speaker EQ
– Seven Biquads for Left and Right
Channels
– Two Biquads for Subwoofer Channel
– Adaptive Coefficients for DRC Filters
– Programmable Input and Output Mixers
– DC Blocking Filters
– Loudness Compensation for Subwoofer
– Automatic Sample Rate Detection and
Coefficient Banking for DRC and EQ
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General Features
– Serial Control Interface Operational Without
MCLK
– Factory-Trimmed Internal Oscillator
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Enables Automatic Detection of Incoming
Sample Rates
– Thermal and Short-Circuit Protection
Benefits
– EQ: Speaker Equalization Improves Audio
Performance
– DRC: Dynamic Range Compression.
Enables Power Limiting, Speaker
Protection, Easy Listening, Night-Mode
Listening
– Autobank Switching: Preload Coefficients
for Different Sample Rates. No Need to
Write Any Coefficients to the Part When
Sample Rate Changes.
– Autodetect: Automatically Detects
Sample-Rate Changes. No Need for
External Microprocessor Intervention
DESCRIPTION
The TAS5705 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 and MPEG decoders.
The device accepts 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 line-level subwoofer or
headphone PWM outputs.
The TAS5705 is a slave-only device receiving clocks
from external sources. The TAS5705 operates at a
384-kHz switching rate for 32-, 48-, 96-,and 192-kHz
data and 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 ]
