3 - Register Description

PROGRAMMING THE DEVICE (continued)

3.1 - Registers Not Controlled By Autostandard (except some mentioned bits)

PRE-FM (Prescale FM Level)

Address

: 02

Type

: R/W

Reset

: 0001 1101

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

0

0

0

FM PRESCALE

FM PRESCALE : 00000

01100

10100

0dB

+12dB

-12dB

(step size = 1dB, range =

±12dB in 2’s complement)

Sets the reference level for an FM signal. Note, this is also dependant on the PLL programming. For

example, with default settings for the PLL, an FM deviation of 27kHz will result in a signal 17dB below full

scale before de-emphasis. At 1kHz, the internal de-emphasis gain is 14dB giving a level of -3dB. Full scale

PRE-NICAM (Prescale NICAM Level)

Address

: 03

Type

: R/W

Reset

: 0001 1101

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

0

0

0

NICAM PRESCALE

NICAM PRESCALE : 00000

01100

10100

0dB

+12dB

-12dB

(step size = 1dB, range =

±12dB in 2’s complement)

Sets the reference level for a NICAM signal. For example, a full scale NICAM signal at 1kHz would be

pre-nicam should be set to -3dB.

STV8203

14/31