TDA7803A-QLX datasheet(37/72 Pages) STMICROELECTRONICS

Part #	TDA7803A-QLX

Description	High efficiency digital input automotive quad power amplifier with built-in diagnostics features, start stop compatible

PDF	72 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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37 / 72 page

DS12195 Rev 7

37/72

TDA7803A

Additional features

7.1

Noise gating

Noise gating is an automatic noise reduction feature that activates when output signal

reaches inaudible levels.

When input signal level falls below -102dBFs the system activity is automatically optimized

in order to limit the output noise level as much as possible and permits the full audio chain to

bring very low noise level on the output speakers.

The noise gating process has a 100ms observation time before turning on, in order to avoid

spurious activations.

The feature is enabled by default and can be disabled selecting IB3-d2.

7.2

Tri-state mode

It can be activated by IB0-4..7= 1. It allows to turn-off one or more channels by individually

disabling it or them by turning to a safety mode status (high impedance) whenever an

overload is detected by the diagnostics, in order to prevent any other inconveniences. All

the other sections not interested by a fault will remain completely operational. The tri-state

mode has to be used with the IC preventively set to Standard Class-AB mode

(IB0-D0..3 = 1). Not to be used as an alternative to "IB7-D0" command (amp on/off during

normal operation)

TDA7803A-QLX Datasheet(PDF) 37 Page - STMicroelectronics