STV82X7 datasheet(71/156 Pages) STMICROELECTRONICS

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STV82x7

ACOEFF1

Channel 1 Baseband PLL Loop Filter Proportional

Coefficient

BCOEFF1

C h an nel 1 B a seban d P L L Lo op Filt e r In t e g r al

Co e f fic ie n t & DCO G a in

Note: 1 FM Pre-scale has to be adjusted depending on the chosen FM Mode.

2 FM squelch threshold has to be adjusted depending on the chosen FM Mode.

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]

00100011

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 12.

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]

00010010

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 12.

Table 12: Baseband PLL Loop Filter Adjustment (FM Mode)

FM Mode

Small

Standard

Medium

Wide1

Refer to DEMOD_MODE[2:0] bits in the DEMOD_CTRL register.

A2 Standard

ACOEFF

10h

22h

2Ch

10h

BCOEFF

1Ah

12h

0Ah

11h

FM_DEV max (kHz)

62.5

125

250

500

125

DCO Range (kHz)

192

384

768

192

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