STV82X8 datasheet(62/157 Pages) STMICROELECTRONICS

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STV82x8

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ACOEFF1

Channel 1 Baseband PLL Loop Filter Proportional

Coefficient

BCOEFF1

Channel 1 Baseband PLL Loop Filter Integral

Coefficient & DCO Gain

(*) Refer to DEMOD_CTRL (DEMOD_MODE[2:0])

FIR1C7[7:0]

1Bh

1Fh

4Ah

43h

4Dh

24h

Address: 1Dh

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

ACOEFF1[7:0]

Bit Name

Reset

Function

ACOEFF1[7:0]

00100010

Used to program the Proportional Coefficient of the baseband PLL loop filter (Channel 1)

Defines the damping factor of the loop. For values, refer to Table 3.

Address: 1Eh

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

BCOEFF1[7:0]

Bit Name

Reset

Function

BCOEFF1[7:0]

00001001

Used to program the Integral Coefficient of the baseband PLL loop filter and DCO gain

Defines the bandwidth of the loop. For values, refer to Table 3.

Table 10: Baseband PLL Loop Filter Adjustment (FM Mode)

FM Mode

Small

Standard

Medium

Wide*

BTSC

ACOEFF

10h

22h

2Ch

22h

BCOEFF

1Ah

12h

0Ah

09h

FM_DEV max (kHz)

62.5

125

250

500

DCO Range (kHz)

192

384

768

Bitfield

Description

(reset state)

FM 27 kHz

FM 50 kHz

FM 200 kHz

FM 350 kHz

FM 500 kHz

BTSC

STV82X8 Datasheet(PDF) 62 Page - STMicroelectronics

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