TDA7719TR データシートの表示（PDF） - STMicroelectronics

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TDA7719TR

3 band car audio processor

STMicroelectronics 

Description

Figure 19. DC offset detection circuit (simplified)

TDA7719

4.13

Level meter

In case of not using DC offset detector, the three pins used for DCO can be configured as

other function. Pin27 (DC_Err / LMOUT) becomes the level meter output. The level meter

block takes signal after main input selector and mix signal into mono, then rectify the signal

and detect the peak of the signal. The output stage of level meter removes the DC voltage of

the signal and the output voltage level shows exactly the Vpeak of signal. Since the

discharge time constant of the level meter is quite slow, it is necessary to reset level meter

regularly (with I2C bus control Byte3 Bit6) to get correct peak information of the signal.

4.14

Output gain control

The output stage of the device can provide a option to have additional 1 dB gain in order to

boost the maximum output level to 2.2 Vrms with maximum 1 % distortion.

4.15

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 QD1L 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.

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Doc ID 13698 Rev 5

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