STV82X8 datasheet(63/157 Pages) STMICROELECTRONICS

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STV82x8

CRF1

Channel 1 Baseband PLL Demodulator Offset

CETH1

Channel 1 FM Carrier Level Threshold

SQTH1

Channel 1 FM Squelch Threshold Register

Address: 1Fh

Type: R

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CRF1[7:0]

Bit Name

Reset

Function

CRF1[7:0]

(00000000) Channel 1 Carrier Recovery Frequency

Displays the instantaneous frequency offset of the Channel 1 Baseband PLL Demodulator.

Address: 20h

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CETH1[7:0]

Bit Name

Reset

Function

CETH1[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. Recommended value is 10h.

CETH

Threshold (dB)

CETH

Threshold (dB)

FFh

-6

10h

-32 (Recommended Value)

80h

-12

08h

-38

40h

-18

00h

OFF (all carrier levels are accepted)

20h

-24 (Default)

Address: 21h

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

SQTH1[7:0]

STV82X8 Datasheet(PDF) 63 Page - STMicroelectronics

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