STV8236 datasheet(53/97 Pages) STMICROELECTRONICS

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STV82x6

SCOEFF

Channel 2 Symbol Tracking Loop Coefficients

SRF

Channel 2 Symbol Tracking Loop Frequency

CRF2

Channel 2 Baseband PLL Demodulator Offset

Address (hex): 35h

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

SCOEFF[7:0]

Bit Name

Reset

Function

SCOEFF[7:0]

00011100

This value is used to program the proportional and integral coefficients of the QPSK Symbol

tracking loop. See Table 17 and Table 18.

Table 17: QPSK System - BG/L/DK Standards (40% Roll-off)

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Small

Medium

Large

Extra-Large

Open Loop

SCOEFF (hex)

1Eh

25h

24h

26h

2Ah

80h

Table 18: QPSK System - I Standard (100% Roll-off)

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Small

Medium

Large

Extra-Large

SCOEFF (hex)

16h

1Dh

1Ch

23h

22h

Address (hex): 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 (hex): 37h

Type: R

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CRF2[7:0]

STV8236 Datasheet(PDF) 53 Page - STMicroelectronics

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