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參數(shù)資料
| 型號(hào)： | STV8203D |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | MULTISTANDARD TV SOUND DEMODULATOR |
| 中文描述： | 多標(biāo)準(zhǔn)電視伴音解調(diào)器 |
| 文件頁數(shù)： | 22/31頁 |
| 文件大?。?/td> | 192K |
| 代理商： | STV8203D |
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AGCS
(AGC Control and Statusfor ADC)
Address
: 12
Type
: R/W
Reset
: 0100 00XX
bit 7
0
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
SIG-UND
AGC-ERR
SIG-OVR
AGC-ERR : Gain Control Signal of amplifier beforeADC. There are 32 steps of 1.25dB.
AGC-ERR [6:2]
00000
00001
.....
11110
11111
When AGC_CMD = 0, AGC-ERR can be read thus indicating the input level. It can alsobe
written to thus presettingthe AGClevel which will then adjust itself to the finalvalue. When
AGC_CMD = 1, the AGC is off and thus writing to AGC-ERR directly controls the AGC
amplifier gain.ReadingAGC_ERRjust confirms the fixed value.
SIG-OVR
SIG-UND
1 = agc under loaded- signal too SMALL
When the AGC is in automaticmode (agc_cmd=0),bit 0 indicates if the input signal is too
small and bit 1 if the AGC is too big. These bits could be used when setting the input level
to the STV8203.
IAGCR
(InternalAGC Referencefor QPSK)
Address
: 14
Type
: R/W
Reset
: 1000 1000
Gain (dB)
0
1.25
.....
37.50
38.75
: 1 = agc overloaded- signal too BIG
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
IAGC-REF
Sets the mean value of the internal AGC, used for QPSK demodulation.The defaultsetting corresponds
to half full scale amplitude at thePLL input.
IAGCC
(InternalAGC Time Constant for QPSK)
Address
: 15
Type
: R/W
Reset
: 0000 0011
bit 7
bit 6
0
bit 5
0
bit 4
0
bit 3
0
bit 2
bit 1
bit 0
IAGC-OFF
IAGC-CST
IAGC-OFF : 1 = Internalagc = off
Onlyenabledwhen AUTOSTANDARDis off.Normally, theinternalAGCshouldbe OFFfor
FM and ON for QPSK.
This bit is controlledby AUTOSTANDARDwhen thisfunctionis activated.
IAGC-CST : InternalAGC ProgrammableStepConstant.
Set the internal AGC time constant; the compromise is between fast settling time (for the
quickestNicamidentification)and noiseimmunity. The controlrange is about 45dB divided
into 0.2dB steps. These bits control the time per step (valuesgiven for QPSKmode):
AGC-CST [2:0]
000
001
.....
111
Step time (
μ
s)
703
352
.....
5.5
Time Response (ms)
105
53
.....
0.82
PROGRAMMING THE DEVICE
(continued)
STV8203
22/31
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| STV8203 | MULTISTANDARD TV SOUND DEMODULATOR |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STV8206 | 功能描述:視頻 IC Audio Proc/Dig Demod RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| STV8207 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders |
| STV8207T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders |
| STV8211 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:VIDEO & SOUND IF SYSTEM |
| STV8216 | 功能描述:視頻 IC Audio Proc/Dig Demod RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
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