STV82X7 datasheet(70/149 Pages) STMICROELECTRONICS

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STV82x7

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SRF

Channel 2 Symbol Tracking Loop Frequency

CRF2

Channel 2 Baseband PLL Demodulator Offset

CETH2

Channel 2 FM Carrier Level Threshold

Address: 36h

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

SRF[7:0]

Bit Name

Reset

Function

SRF[7:0]

00000000

Displays in two’s complement format the frequency deviation between the incoming NICAM

bitstream and the quartz clocks. The maximum error is ±250 ppm.

Address: 37h

Type: R

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CRF2[7:0]

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: 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

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