STV82X6 datasheet(52/95 Pages) STMICROELECTRONICS

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STV82x6

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CETH2

Channel 2 FM Carrier Level Threshold

SQTH2

Channel 2 FM Squelch Threshold

Bit Name

Reset

Function

CRF2[7:0]

00000000

Channel 2 Carrier Recovery Frequency.

Displays the instantaneous frequency offset of the Channel 2 Baseband PLL

Address (hex): 38h

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CETH2[7:0]

Bit Name

Reset

Function

CETH2[7:0]

00100000

This register is used to compare the carrier level in the channel and the threshold value. This

level is measured after the channel filter and is relative to the full scale reference level (0 dB).

This is used as part of the validation of an FM signal, if the carrier level is below the threshold,

the signal is considered to be non-valid.

CETH

Threshold (dB)

CETH

Threshold (dB)

FFh

-6

10h

-32

80h

-12

08h

-38

40h

-18

00h

OFF (All carrier levels are accepted)

20h

-24 (Default

Address (hex): 39h

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

SQTH2[7:0]

Bit Name

Reset

Function

SQTH2[7:0]

00111100

The squelch detector measures the level of high frequency noise (> 40 kHz) and compares it to

the threshold level (SQTH). If the level is below this value, the S/N of the FM signal is

considered to be acceptable. Values are given for FM with standard deviation.

SQTH

S/N (dB)

FAh

77h

3Ch

15 (Default)

23h

19h

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