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TDA7416

1.1.1 Pseudo-differential stereo Input (IN1)

The IN1-input is implemented as a buffered pseudo-differential stereo stage with 100k

Ω input-impedance

at each input pin. This input is also configurable as single-ended stereo input . The common input-pin, IN1-

features a fast charge switch to speed up the charge time of external capacitors.- This switch is released

the first time the input-selector data-byte (0) is assessed.

1.1.2 Single-ended stereo Inputs

All single ended inputs have an input impedance of 100k

Ω.

1.2 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. gen-

erated 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 align-

ment. To avoid audible clicks the Audioprocessor have to be muted by softmute or hard mute during this

time.

1.2.1 AutoZero-Remain

In some cases, for example if the µP is executing a refresh cycle of the IIC-Bus-programming, it is not

useful to start a new AutoZero-action because no new source is selected and an undesired mute would

appear at the out-puts. For such applications the TDA7416 could be switched in the AutoZero-Remain-

Mode (Bit 6(I1) of the subad-dress-byte). If this bit is set to high, the DATABYTE 0 could be loaded without

invoking the AutoZero and the old adjustment-value remains.

1.3 Loudness

There are four parameters programmable in the loudness stage:

1.3.1 Attenuation

dB

Hz

-25.0

-20.0

-15.0

-10.0

-5.0

0.0

10.0

100.0

1.0K

10.0K