TDA7786 datasheet(41/54 Pages) STMICROELECTRONICS

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TDA7786, TDA7786M

Front-end registers

All the parameters in this section refer to the programmability of the FE part of the device

(registers). The part of the registers that are not described here have either fixed values or

values written by the tuner drivers, and are described in the proper technical documentation.

Table 31. Register 0x00

MSB

LSB

23 22 21 20 19 18 17 16 15 14 13 12 11 10 987 6543 210

AM mixer input selector

0 1 Input #1

1 0 Input #2

AM PIN diode

Internal

External

AM AGC mode

LNA and PIN diode

PIN diode only

AM AGC time constant

0 0

Slow (125 ms with 1 µF)

0 1

Medium (25ms with 1 µF)

1 1

Fast (5ms with 1 µF)

AM AGC thresholds @ mixin

0 0 0

90.2 dBµV @ mixin

0 0 1

92.0 dBµV @ mixin

0 1 0

93.8 dBµV @ mixin

0 1 1

95.6 dBµV @ mixin

1 0 0

88.4 dBµV @ mixin

1 0 1

86.6 dBµV @ mixin

1 1 0

84.8 dBµV @ mixin

1 1 1

83 dBµV @ mixin

AM AGC attack time constant

Normal

Fast

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