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STV82X8 Datasheet(PDF) 20 Page - STMicroelectronics

Part # STV82X8
Description  Digital Audio Decoder / Processor for BTSC Television/Video Recorders
PDF  157 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STV82X8 Datasheet(HTML) 20 Page - STMicroelectronics

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Digital Demodulator
STV82x8
20/157
must be reset by re-programming the LSB of register IRQ_STATUS while checking the detected
standard status by reading registers AUTOSTD_STATUS.
ITo recover out-of standard FM deviations or the Sound Carrier Frequency Offset, additional I²C
controls are provided without interfering with the Automatic Standard Recognition System
(Autostandard).
(1) L+R and L-R must not exceed 50 kHz
Sound Carrier Frequency Offset Recovery:IF Carrier frequency can be adjusted with register
CAROFFSET1 within a large range (up to 120 kHz ) while the Automatic Standard Recognition
System remains active. The frequency offset estimation is written in registers DEMOD_DC_LEVEL
and can be used to implement the Automatic Frequency Control (AFC) via an external I²2C 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_CTRL by setting to 0 bits SAP_CHECK, STEREO_CHECK and MONO_CHECK.
Table 4: BTSC Standard
Source
Modulation
Frequency
Range
Audio Pre-
processing
Sub-Carrier
Modulation
Type
Sub-Carrier
Deviation
Aural
Carrier
(4.5 MHz)
Peak
Deviation
Monophonic
L+R
0.05 -15 kHz
75 µs Pre-
emphasis
25 kHz (1)
Pilot
0Fh
5 kHz
Stereophonic
L-R
0.05 -15 kHz
DBX
Compression
2Fh
AM DSB SC
50 kHz(1)
SAP
2nd Channel
0.05 -15 kHz
DBX
Compression
5Fh
FM
10 kHz
15 kHz



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