TDA7718B Datasheet, PDF (25/40 Pages) STMicroelectronics – 3 band car audio processor

TDA7718B
Description of the audioprocessor
4.11
Audioprocessor testing
In the test mode, which can be activated by setting bit D7 of the I²C subaddress byte and bit
D0 of the testing audioprocessor byte, several internal signals are available at the SE1L pin.
In this mode, the input resistance of 100 k is disconnected from the pin. Internal signals
available for testing are listed in the data-byte specification.
Figure 19. Application schematic
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4.12
Application note
Above application schematic shows a proposal typical application that QD1 and FD/QD2 is
used as external signal sources. To limit the leakage current from signal source a 1 k
resistor is recommended to put between de-coupling capacitor and pin if the output
impedance of external signal source is less than 1 k.
It's guaranteed that all input pins (pin 1~13) will not be broken even if 2Vrms input signal is
applied to the pins when CSP is power off.
DocID18305 Rev 3
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