TDA7406 datasheet(17/64 Pages) STMICROELECTRONICS

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TDA7406

Description of the audioprocessor part

17/64

Figure 3.

Input-stages

4.2

AutoZero

The AutoZero allows a reduction of the number of pins as well as external components by

canceling any offset generated by or before the In-Gain-stage (Please notice that externally

generated offsets, e.g. generated through the leakage current of the coupling capacitors,

are not canceled).

The auto-zeroing is started every time the DATA-BYTE 0 is selected and needs max. 0.3ms

for the alignment. To avoid audible clicks the Audioprocessor have to be muted by soft mute

or hard mute during this time.

4.2.1

AutoZero for Stereodecoder-Selection

A special procedure is recommended for selecting the stereodecoder at the input-selector to

guarantee an optimum offset-cancellation:

(Step 0: SoftMute or Mute the signal-path)

Step 1: Temporary deselect the stereodecoder at the input-selector

Step 2: Configure the stereodecoder via IIC-Bus

Step 3: Wait 1ms

Step 4: Select the stereodecoder

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