STV82X7 datasheet(76/156 Pages) STMICROELECTRONICS

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STV82x7

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ACOEFF2

Channel 2 Baseband PLL Loop Filter Proportional

Coefficient

BCOEFF2

Channel 2 Baseband PLL Loop Filter Integral

Coefficient & DCO Gain

FIR2C3[7:0]

00h

FDh

03h

00h

FIR2C4[7:0]

06h

02h

00h

FFh

FIR2C5[7:0]

0Eh

0Dh

F4h

04h

FIR2C6[7:0]

16h

18h

0Ah

14h

FIR2C7[7:0]

1Bh

1Fh

3Dh

25h

Address: 33h

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

ACOEFF2[7:0]

Bit Name

Reset

Function

ACOEFF2[7:0]

10010000

This value defines the loop clamping factor used to program the Proportional Coefficient of the

baseband PLL loop filter (Channel 2). See Table 15 and Table 16.

Address: 34h

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

BCOEFF2[7:0]

Bit Name

Reset

Function

BCOEFF2[7:0]

10101100

This value defines the loop bandwidth used to program the Integral Coefficient of the Baseband

PLL loop filter and DCO gain. See Table 15 and Table 16.

Table 15: Baseband PLL Loop Filter Adjustments (FM Mode)

FM mode

Small

Standard

Mid

Wide

A2 standard

ACOEFF

10h

22h

2Ch

10h

BCOEFF

1Ah

12h

0Ah

11h

Table 14: Channel 2 FIR Coefficients

Bitfield

Description

FM 27 kHz

FM 50 kHz

QPSK 40%

(reset state)

QPSK100%

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