TDA7705 datasheet(35/42 Pages) STMICROELECTRONICS

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TDA7705

Weak signal processing

Doc ID 15938 Rev 9

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5.1.5

High cut control

Table 30.

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)

Depends only on field strength filter time constant.

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

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

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