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STV8216 датащи(PDF) 44 Page - STMicroelectronics

номер детали STV8216
подробное описание детали  Multistandard TV Audio Processor and Digital Sound Demodulator
PDF  97 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STV8216 датащи(HTML) 44 Page - STMicroelectronics

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Register List
STV82x6
44/97
Note:
These registers allow direct access to the demodulator signal detectors.
AGCC
AGC Control for IF ADC
FM1_CAR
0
Channel 1 FM/AM Carrier detector flag
0: Not detected
1: Detected
FM1_SQ
0
Channel 1 FM Squelch detector flag
0: Not detected
1: Detected
Address (hex): 0Eh
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
AGC_CMD
0
0
AGC_REF[2:0]
AGC_CST[1:0]
Bit Name
Reset
Function
AGC_CMD
0
Automatic Gain Control Command Mode
Normally set to 0 enabling automatic mode. For L/L’ standards, the AGC should be switched off
due to the presence of the AM sound carrier. In this case, a fixed gain value should be set using
the AGCS register.
0: Automatic mode. AGC controlled by the AUTOSTD function. (Default)
1: Manual/Forced mode
Bits[6:5]
00
Reserved.
AGC_REF[2:0]
100
This bitfield is used to defines the clipping level which adjusts the allowable proportion of samples
at the input of the ADC which will be clipped. The AGC tries to maximize the use of the full scale
range of the ADC. The default setting gives a ratio of 1/256.
Clipping Ratio
Clipping Ratio
000:
1/16 (Single carrier)
100:
1/256 (Default
001:
1/32
101:
1/512
010:
1/64
110:
1/1024
011:
1/128
111:
1/2048 (Multiple carriers)
AGC_CST[1:0]
01
AGC Time Constant
This is the time constant between each step of 1.25 dB by the ADC.
Step Duration (ms)
00
1.33
01
2.66
10
5.33
11
10.66
Bit Name
Reset
Function



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