參數(shù)資料
型號: STV8237
廠商: 意法半導(dǎo)體
英文描述: Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
中文描述: 數(shù)字音頻解碼器/處理器為A2和麗音電視/錄像機
文件頁數(shù): 61/149頁
文件大?。?/td> 2775K
代理商: STV8237
61/149
STV82x7
Register List
AGC_GAIN
IF AGC Control and Status Register
Note:
When
AGC_CMD = 0
,
AGC_ERR[4:0]
can be read -- indicating the input level. It can also be written
to -- presetting the AGC level which will then adjust itself to the final value.
When
AGC_CMD = 1
, the AGC is off and writing to
AGC_ERR[4:0]
directly controls the AGC
amplifier gain. Reading AGC_ERR just confirms the fixed value.
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
01
10
11
1.33
2.66
5.33
10.66
Address: 0Fh
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
AGC_ERR[4:0]
SIG_OVER
SIG_UNDER
Bit Name
Reset
Function
Bit 7
0
Reserved.
AGC_ERR[4:0]
00000
Amplifier Gain Control
This is the Gain Control value of AGC. There are 20 steps of +1.5 dB (see Note below).
00000: Gain-min
10100: Gain-min + 30db
11111: Gain-min + 30db
SIG_OVER
0
AGC Input SIgnal Upper Threshold
0: Normal signal
1: Signal too large and AGC is overloaded
SIG_UNDER
0
AGC Input SIgnal Lower Threshold
0: Normal signal
1: Signal too small and AGC is underloaded
When the AGC is in Automatic mode (AGC_CMD = 0), bits SIG_OVER and SIG_UNDER indicate
if the input signal is too small/large and the AGC is under/overloaded. This is useful when setting
the STV82x7 SIF input level.
Bit Name
Reset
Function
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