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STV8217 Datasheet(PDF) 66 Page - STMicroelectronics

Part # STV8217
Description  Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
PDF  149 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STV8217 Datasheet(HTML) 66 Page - STMicroelectronics

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Register List
STV82x7
66/149
12.6
Demodulator Channel 2
IAGCR
Channel 2 Internal AGC Reference for QPSK
IAGCC
Channel 2 Internal AGC Time Constant for QPSK
Address: 25h
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
IAGC_REF[7:0]
Bit Name
Reset
Function
IAGC_REF[7:0]
10001000
Sets the mean value of the internal AGC, used for QPSK demodulation. The default setting
corresponds to half full scale amplitude at the baseband PLL input.
Address: 26h
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
IAGC_OFF
FAR_FLT_EN
MONO_FLT_EN
BG_SEL
MONO_PROG
IAGC_CST[2:0]
Bit Name
Reset
Function
IAGC_OFF
0
AGC Disable
0: Internal AGC is active
1: Internal AGC is disabled
FAR_FLT_EN
0
1: Enable Farrow filter for NICAM
MONO_FLT_EN
0
1: Enable Mono filter for NICAM
BG_SEL
0
1: BG NICAM Mono filter selected
MONO_PROG
0
1: Enable programmation of Mono filter
IAGC_CST[2:0]
011
Internal AGC Programmable Step Constant.
These bits control the time per step (values given for QPSK mode). The default value defines the
optimum trade-off between fast settling time (for the fastest NICAM identification) and the noise
immunity (minimum BER degradation)
Step time (us) Time Response (ms)
000
703
128
001
352
64
010
176
32
011
88
16
100
44
8
101
22
4
110
11
2
111
5.5
0.82



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