TDA7571

Functions, pins and components description

17/21

4.8

External connections description

4.8.1

CD, THWEXT, THWINT

These pins, if used, it must be connected to a pull-up resistor (>10kOhm) connected to a

supply voltage referred to the receiver device (as example, a µP).

Maximum voltage = 6V.

4.8.2

MUTE

Mute pin

4.8.3

ST-BY - St-By pin.

To avoid pop noise due to multiple ST-BY parasitic pulses, an R-C network must be added

(as example 47kOhm, 0.1µF)

4.8.4

+Vs-low -

This pin supply the low voltage circuits. It can be connected to the +Vs or to a reference

voltage comprising between 12V to +Vs.

A connection to +Vs through a 100Ohm resistor, together a 1uF capacitor placed from +Vs-

low and GND is possible too.

4.8.5

DATA, SEL, SCK

4.8.6

MCLK

Master clock input. Must be F(MCLK) = 256 x Fs (11289.6kHz in case of Fs = 44.1 kHz)

4.8.7

DGND

Digital ground

4.8.8

BRIDGE and L/R

With this pin, the mode of working of the device (bridge or single-ended) can be selected.

If it is connected to the pin 32 (DGND) the device works in single-ended mode

If it is connected to the pin 40 (5Vdig) the device works in bridge mode.

In case of bridge mode, the pin 34 (L/R) makes the channel selection. If connected to

DGND, the Left channel is selected. If connected to 5Vdig, is selected the Right channel.

These pins must be selected with the device in ST-BY condition.

In case of single-ended operation, it is suggested to put the L/R pin at 5V.