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STV8237 Datasheet(PDF) 24 Page - STMicroelectronics

Part # STV8237
Description  Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
PDF  156 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STV8237 Datasheet(HTML) 24 Page - STMicroelectronics

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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
I
FM Mono
6.0
FM/NICAM
6.0
6.552
27
50
80
J17
100
L
AM/NICAM
6.5
5.850
J17
40
M/N
FM Mono
4.5
15
27
50
75 µs
FM 2-Carrier
A2+
4.5
4.724
15
27
50
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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