STV8217 datasheet(24/156 Pages) STMICROELECTRONICS

24 / 156 page

Digital Demodulator

STV82x7

24/156

For Chinese TV transmissions (DK-NICAM) which are subject to overmodulation, different FM

deviations are proposed for sound demodulation.

Sound Carrier Frequency Offset Recovery: Both Mono and Stereo IF Carrier frequencies can be

adjusted independently (registers CAROFFSET1 and CAROFFSET2) within a large range (up to

120 kHz for standard mono FM deviations) while the Automatic Standard Recognition System

remains active. The frequency offset estimation is written in registers DC_REMOVAL_L and

DC_REMOVAL_R (Mono Left / Channel 1 and Mono Right / Channel 2, respectively) and can be

used to implement the Automatic Frequency Control (AFC) via an external I²C control.

Manual Mode: If required, the Automatic Standard Recognition System system can be disabled

(Manual mode) and the user can control all registers including those only controlled by the

Automatic Standard Recognition System function when active. Manual mode is selected in register

AUTOSTD_STANDARD_DETECT (bit LDK_SCK, I_SCK, BG_SCK and MN_SCK set to 0).

D/K2

FM 2-Carrier

A2*

6.5

6.742

50 µs

54.6875

D/K3

FM 2-Carrier

A2*

6.5

5.742

50 µs

54.6875

FM Mono

6.0

FM/NICAM

6.0

6.552

J17

100

AM/NICAM

6.5

5.850

J17

M/N

FM Mono

4.5

75 µs

FM 2-Carrier

A2+

4.5

4.724

75 µs

55.069

Table 4: Recognized Standards (Continued)

System

Sound Type

Type

Name

Carrier 1

(MHz)

Carrier 2

(MHz)

FM Deviation

De-

emphasis

Roll

-off

(%)

Pilot

Frequency

(kHz)

Nom. Max. Over

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