TDA7569BLVPD datasheet(26/41 Pages) STMICROELECTRONICS

Part #	TDA7569BLVPD

Description	4 x 50 W power amplifier with full I2C diagnostics, high efficiency and low voltage operation

PDF	41 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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TDA7569BLV

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DocID023498 Rev 9

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8.1

Inputs impedance matching

Figure 37. Inputs impedance matching circuit

The above is a simplified input stage where it is visible that the AC-GND impedance (60 kΩ)

is the same as the input one.

During battery variations the SVR voltage is moved and VIN and VAC-GND tracks it through

the two R-C networks.

Any differences of this two time constants can produce a differential input voltage, which can

produce a noise.

Consequently, any additional passive components at the inputs (other than the input

capacitors) such as series resistance or R dividers must be compensated for at AC-GND

level by connecting the same equivalent resistance in series to CAC-GND.

A good 1:1 matching (ZAC-GND = ZIN) is therefore recommended to minimize pop. This rule

applies to both "4-CH operation" and "2-CH operation", as any unused input has be AC-

grounded (through the same CIN value).

TDA7569BLVPD Datasheet(PDF) 26 Page - STMicroelectronics