Description of the input part

TDA7501

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3.4

Transfer function of the AM/FM level inputs

In the TDA7501 two level shift stages convert a tuner level (DC) signal to a unipolar output

signal with respect to the Codec Interface reference, that is 1.65V.

The FM level input can be programmed to a signal range of either 0 to 5V (Lo range) which

is the default, or 0 to 6V (Hi range). The AM level input is fixed to the lower 0 to 5V input

range.

For the programming of the FM level input range see the programming section.

Figure 9.

AM/FM level inputs transfer function (DC)

1

0

2345 Vin(V)

1.65

1.90

2.15

2.30

2.65

Vout

(V)

LO RANGE

HI RANGE

D00AU1204