TDA7786 datasheet(47/54 Pages) STMICROELECTRONICS

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DocID026122 Rev 5

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TDA7786, TDA7786M

Weak signal processing

5.1.5

High cut control

Table 40. High cut control - continuous set

Symbol

Parameter

Test condition

Min

Typ

Max

Units

HCFSsp

Start point vs. field strength

minimum RF level for widest

HC filter (filter # 7)

no multipath present

050

dBµV

HCFSep

End point vs. field strength

maximum RF level for

narrowest HC filter (filter # 0)

no multipath present

030

dBµV

HCFStW2N

Field strength-related

transition time from wide to

narrow band

Vrf step-like variation from

60 dBµV to 10 dBµV

(1)

HCFStN2W

Field strength-related

transition time from narrow to

wide band

Vrf step-like variation from

0 dBµV to 60 dBµV

(1)

100

HCMPsp

Start point vs. multipath

minimum RF level for widest

HC filter (filter # 7)

equivalent 19 kHz AM

modulation depth;

field strength = 80 dBµV

150 (2)

HCMPep

End point vs. multipath

maximum RF level for

narrowest HC filter (filter # 0)

equivalent 19 kHz AM

modulation depth;

field strength = 80 dBµV

150 (2)

HCMPtN2W

Multipath-related transition

time from narrow to wide

band

Vrf step-like variation from

20 dBµV to 80 dBµV

0.001

HCMPtW2N

Multipath-related transition

time from wide to narrow

Vrf step-like variation from

80 dBµV to 20 dBµV

0.001

HCmaxBW

Maximum cut-off frequency of

high cut filter bank

Filter #7, -3 dB response

frequency, input signal with

pre-emphasis

HCmin

kHz

HCminBW

Minimum cut-off frequency of

high cut filter bank

Filter #0, -3 dB response

frequency, input signal with

pre-emphasis

0.1

HCma

xBW

kHz

HCnumFilt Number of discrete HC filters -

8 (3)

1. Depends only on field strength filter time constant.

2. Means that 100% equivalent 19 kHz AM modulation depth will not achieve full band narrowing.

3. Intermediate filters (#6 - #1) cut-off frequencies exponentially spaced between HCmaxBW and HCminBW.

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