STV8216 datasheet(16/97 Pages) STMICROELECTRONICS

16 / 97 page

Demodulator Block

STV82x6

16/97

Note:

D1 and D2 define the two channels encoded in the NICAM packet.

2.2

System Clock

The System Clock integrates a low-jitter PLL clock and can be fully reprogrammed via registers

PLL_DIV, PLL_MD, PLL_PEH and PLL_PEL. The default values are designed for a standard

27-MHz quartz crystal frequency, which is the recommended frequency for minimizing potential

RF interference in the application. This sinusoidal clock frequency, and any harmonic products,

remains outside the TV picture and sound IF (PIF/SIF) and Band-I RF passbands and has been

selected in order to reduce the risk of potential interference to the TV IF and RF system.

However, if required, the PLL clock can be re-programmed for an other quartz crystal frequency

within a range between 23 and 30 MHz.

Note:

A change in the crystal frequency is compatible with other default I²C programming values,

including those of the built-in Automatic Standard Recognition System.

Table 5: NICAM System Transmission Modes

System Mode

NICAM_STAT[

4:1]

NICAM

De-emphasis

CH_LANG[1:0]

Sound

Selection

Sound

Backup

NICAM Stereo

1000

J17

NICAM Stereo

FM/AM Mono

NICAM Dual Mono

(CH1 = A, CH2 = B)

1010

J17

NICAM Mono A

FM/AM Mono

NICAM Mono B

Mute

NICAM Mono+Data

(D1 = A, D2 = Data)

1001

J17

NICAM Mono A

FM/AM Mono

NICAM Data

1011

J17

FM/AM Mono

NICAM Stereo (no backup)

0000

J17

FM/AM Mono A

NICAM Stereo

Mute

NICAM Dual Mono (no backup) (D1

= B, D2 = C)

0010

J17

FM/AM Mono A

NICAM Mono B

Mute

NICAM Mono C

NICAM Mono+Data (no backup)

(D1 = B, D2 = Data)

0001

J17

FM/AM Mono A

NICAM Mono B

Mute

NICAM undefined (no backup)

X1XX

J17

FM/AM Mono

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