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STV82X8 датащи(PDF) 59 Page - STMicroelectronics

номер детали STV82X8
подробное описание детали  Digital Audio Decoder / Processor for BTSC Television/Video Recorders
PDF  157 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STV82X8 датащи(HTML) 59 Page - STMicroelectronics

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STV82x8
Register List
Note:
These registers allow direct access to the demodulator signal detectors.
AGC_CTRL
IF AGC Control Register
Bit Name
Reset
Function
Bits [7:2]
000
Reserved.
FM1_CAR
0
Channel 1 FM Carrier Detector Flag
0: Not detected
1: Detected
FM1_SQ
0
Channel 1 FM Squelch Detector Flag
0: Not detected
1: Detected
Address: 0Eh
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
IF_SELECT
AGC_REF[2:0]
AGC_CST[1:0]
Bit Name
Reset
Function
Bits[7:5]
00
Reserved.
IF_SELECT
0
Selection of the IF input.
0: IF input SIF 1
1: IF input SIF 2
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 1.5 dB by the AGC.
Step Duration (ms)
00
1.33
01
2.66
10
5.33
11
10.66



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