Datasheet

1
FEATURES
DESCRIPTION
−140
−120
−100
−80
−60
−40
−20
0
20
f − Frequency − Hz
Amplitude
− dB
G018
5k 15k 20k12k10k9k8k7k6k
Closest Open-Loop
Competitor
TIClosed-Loop
Fundamental
AudioInput
40dB
Inprovement
2
nd
Order
Sideband
AudioInput=10kHz
SupplyRipple=1kHz,500mVpp
3
rd
Order
Sideband
f − Frequency − Hz
20 100 1k 10k
THD+N − TotalHarmonicDistortion+Noise − %
20k
G019
0.01
10
0.1
1
P =3W
O
SupplyRipple=1kHz,500mVpp
ClosestOpen-Loop
Competitor
TIClosed-Loop
TAS5710
www.ti.com ............................................................................................................................................................................................... SLOS605 – JANUARY 2009
20-W STEREO DIGITAL AUDIO POWER AMPLIFIER WITH EQ/DRC and FEEDBACK
• Audio Input/Output • Benefits
– 20-W Into an 8- Ω Load From an 18-V Supply – EQ: Speaker Equalization for Better Sound
– Wide PVCC Range (10 V to 26 V) – 2-Band DRC: Improved Bass Performance,
Enables Speaker Protection and Night
– Supports One Serial Audio Input (8 kHz - 48
mode Listening
kHz Sample Rates) (LJ/RJ/I
2
S)
– Autobank Switching: Preloaded
– Power-Stage Feedback Allows Operation
Coefficients for Three Different Sample
From Poorly Regulated Power Supplies
Rates Eliminates the Need to Update
• Audio/PWM Processing
Coefficients When Sample Rate Changes
– Factory-Trimmed Internal Oscillator for
– Autodetect: Automatically Detects
Automatic Rate Detection
Sample-Rate Changes Eliminating the Need
– High-End 32-Bit Data Path Audio Processor
for External Microprocessor Intervention
– 18 Biquads for Speaker EQ
– Closed-Loop Power Stage: Enables Wide
– Dynamic Range Control (DRC)
PVCC Operating Range and Reduced
– Support for Pseudo Bass and 3D Effects Power Supply Ripple Distortion
The TAS5710 is a 20-W, efficient, digital audio power amplifier for driving stereo bridge-tied speakers. A 32-bit
datapath eliminates the need for pre-scaling before processing and preserves signal integrity without sacrificing
dynamic range. A digital audio processor with fully programmable digital filters allows designers to custom tune
speakers for optimum sound in small enclosures. A programmable DRC can adjust power levels for a scaleable
design while also enabling night-mode listening modes.
The closed-loop architecture allows the device to operate from poorly regulated supplies. Figure 1 below shows
the benefit of the feedback architecture when a noisy supply (1kHz, 500mVpp ripple) modulates a 10kHz audio
input. The figure shows a 40dB improvement in sideband suppression when compared to an open-loop design.
This correlates directly to a 24dB improvement in distortion as seen in Figure 2 .
Figure 1. Supply Ripple Intermodulation Distortion Figure 2. THD+N vs Frequency
1
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.
PRODUCTION DATA information is current as of publication date.
Copyright © 2009, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.