TDA7572 datasheet(7/64 Pages) STMICROELECTRONICS

7 / 64 page

TDA7572

Detailed features

7/64

Detailed features

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Input Stage and Gain Compressor

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Differential, high CMRR, analog input

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Programmable input attenuation/gain to support up to four drive levels

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Noiseless Gain compression of up to 16 dB with programmable attack and decay.

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Compressor controlled by monitoring estimated THD

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Soft mute / un-mute for pop control

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Over-modulation Protection and Current Limiting

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Adaptive pulse injection prevents missing pulses due to over modulation which

maximizes useful output swing.

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Programmable current limiting based on FET VDS

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Modulator

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Optimized for low distortion at low switching frequency (approximation 110KHz)

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Dual Clocked PWM modulators for 3 state switching

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External gain control / internal integrator components

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Controls 4 external FETS with switching optimized for low EMI

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Oscillation frequency selectable by I2C

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Anti-pop shunt driver

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DAC

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18bit, mono

–I2S inputs 38-48KHz, 96KHz, 192 KHz

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Hybrid architecture, area optimized for Bass

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Full bandwidth supported by off loading the interpolator function

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Synchronization with modulator

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Step-Up

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On board STEP-UP step up converter, synchronized to the modulator frequency

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Drives external NFET switch

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Externally compensated

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Soft start and current limiting

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Mode Control

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Critical modes controllable by mode pins for bus-less operation

–I2C provides additional mode control

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Diagnostics / Safety

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Offset, short, open, overcurrent, over temperature

–I2C used to report errors, and for configuration control

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Faults pin used to report errors in bus-less environment

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Clipping reported at a separate pin

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Abnormal supply current detection disables input power for fail safe operation

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Output current limiting

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Power control

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Latching control of an external PMOS power switch for safety related faults.

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Power is switched off for safety related faults of abnormal supply current,

excessive internal or external temperature, or persistent output stage over-current

that fails to be controlled by the pulse-by-pulse current limiting method

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