TDA7786 datasheet(45/54 Pages) STMICROELECTRONICS

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TDA7786, TDA7786M

Weak signal processing

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

The typical values are those set by default parameters (start-up without parametric change

from main microprocessor); the max and the min values refer to the programmability range.

The values are referred to the typical application (‘wide-band’ in FM). Wherever the possible

values are a discrete set, all the possible programmable values are displayed.

5.1

FM IF-processing

5.1.1

Dynamic channel selection filter (DISS)

5.1.2

Soft mute

Table 36. Dynamic channel selection filter (DISS) - discrete set

Symbol

Parameter

Test condition

Min

Typ

Max

Units

DISS BW

IF filter #10

response: - 3dB

±150

kHz

IF filter #9

±120

kHz

IF filter #8

±100

kHz

IF filter #7

±85

kHz

IF filter #6

±75

kHz

IF filter #5

±65

kHz

IF filter #4

±60

kHz

IF filter #3

±55

kHz

IF filter #2

±45

kHz

IF filter #1

±35

kHz

IF filter #0

±25

kHz

Table 37. Soft mute - continuous set

Symbol

Parameter

Test condition

Min

Typ

Max

Units

SMsp

Start point vs. field strength

audio atten = 1 dB

read “FM_SoftMute”

no adjacent channel present

dBµV

SMep

End point vs. field strength

audio atten = SMd + 1 dB

read “FM_SoftMute”

no adjacent channel present

-6

dBµV

SMd

Depth

-30

-15

SMtauatt

Field strength LPF cut-off

frequency for soft mute activation

0.1

100

4000

SMtaurel

Field strength LPF cut-off

frequency for soft mute release

0.1

4000

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