TAS5708 20-W Stereo Closed-Loop I2S Audio Power Amplifier with Speaker EQ and DRC | TI.com

TAS5708 (ACTIVE)

20-W Stereo Closed-Loop I2S Audio Power Amplifier with Speaker EQ and DRC

 

Special note

Next generation with Hybrid Modulation, higher performance and more features: TAS5805M.

Next Generation 20-W Stereo, 16V Closed-Loop Digital Input Audio Class-D Amplifier:  TAS5760L

Next Generation 25-W Stereo, 26V Closed-Loop Digital Input Audio Class-D Amplifier:  TAS5760M

Description

The TAS5708 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.

Features

  • Audio Input/Output
    • 20-W Into an 8-Ω Load From an 18-V Supply
    • Wide PVCC Range (10 V to 26 V); 3.3 V Digital Supply
    • Supports One Serial Audio Input (8 kHz - 48 kHz Sample Rates) (LJ/RJ/I2S)
    • Power-Stage Feedback Allows Operation From Poorly Regulated Power Supplies
  • Audio/PWM Processing
    • Factory-Trimmed Internal Oscillator for Automatic Rate Detection
    • High-End 32-Bit Data Path Audio Processor
    • 14 Biquads for Speaker EQ
    • Dynamic Range Control (DRC)
  • Benefits
    • EQ: Speaker Equalization Improves Audio Performance
    • DRC: Enables Speaker Protection and Night-Mode Listening.
    • Autobank Switching: Preloaded Coefficients for Three Different Sample Rates Eliminates the Need to Update Coefficients When Sample Rate Changes
    • Autodetect: Automatically Detects Sample-Rate Changes Eliminating the Need for External Microprocessor Intervention
    • Closed-Loop Power Stage: Enables Wide PVCC Operating Range and Reduced Power Supply Ripple Distortion

Parametrics

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Part number Order Audio input type Architecture Speaker channels (Max) Power stage supply (Min) (V) Power stage supply (Max) (V) Output power (W) Load (Min) (ohms) SNR (dB) THD + N @ 1 kHz (%) Iq (Typ) (mA) Control interface Closed/open loop Analog supply (Min) (V) Analog supply (Max) (V) Power to parallel bridge tied load (Max) (W) Sampling rate (Max) (kHz) Operating temperature range (C) Rating
TAS5760L Order now Digital Input     Class-D     Stereo     4.5     16.5     21     2     100     0.09     27     Hardware
Software    
Closed     4.5     16.5     43.2     192     -25 to 85     Catalog