TDA7719 STMicroelectronics, TDA7719 Datasheet - Page 26

• Manufacturer Part Number: TDA7719
• Description: IC AUDIO PROCESSOR CAR 28-TSSOP
• Manufacturer: STMicroelectronics
• Type: Audio Processorr
• Series: -r

Specifications of TDA7719

• Applications: Radio
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Description
4.13
4.14
4.15
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Figure 19. DC offset detection circuit (simplified)
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 I
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.
Audioprocessor testing
In the test mode, which can be activated by setting bit D7 of the I
D0 of the testing-audioprocessor byte, several internal signals are available at the QD1L pin.
In this mode, the input resistance of 100 kΩ is disconnected from the pin. Internal signals
available for testing are listed in the data-byte specification.
2
C bus control Byte3 Bit6) to get correct peak information of the signal.
Doc ID 13698 Rev 4
2
C subaddress byte and bit
TDA7719