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參數(shù)資料
| 型號： | STV8203 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | MULTISTANDARD TV SOUND DEMODULATOR |
| 中文描述： | 多標準電視伴音解調(diào)器 |
| 文件頁數(shù)： | 24/31頁 |
| 文件大?。?/td> | 192K |
| 代理商： | STV8203 |
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CRF2 - CRF1
(FM/QPSKPLL Demodulator Offset)
Address
: 20-3D
Type
: R/W
Reset
: 0000 0000
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
CHANNEL 2 orCHANNEL 1 CARRIER RECOVERY FREQUENCY
Thisregisterprovidesaccess to the instantaneousfrequencyof the PLL(2’s complement). If writtento, it
willpresettheDCOfrequency;if readitprovidesthe instantaneousfrequencyoffsetof the PLL’sandcould
be used for an AFC function.
CETH2 - CETH1
(FM Carrier Level Threshold)
Address
: 21-3E
Type
: R/W
Reset
: 00110101
bit 7
bit 6
bit 5
CHANNEL 2 orCHANNEL 1 CARRIER-THRESHOLD
bit 4
bit 3
bit 2
bit 1
bit 0
Theseregisters,which performthe samefunctionin channel 1and channel2, comparethe carrier levelin
thechannel againstthethresholdvalue.This levelis measuredafter thechannelfilter andis relativeto the
full scale referencelevel(0dB).
This is used as part of the validationof an FM signal, if the carrierlevel is below the threshold, the signal
is considered to be non-valid.
CETH
255
128
64
32
....
0
Threshold (dB)
-6
-12
-18
-24
....
OFF
If CETH is OFF, any carrier level will be accepted.
The reset value is 53, it means a thresholdof -20dB.
SQTH2-SQTH1
(FM SquelchThreshold)
Address
: 22-3F
Type
: R/W
Reset
: 00111100
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
CHANNEL 2 or CHANNEL 1 SQUELCH-THRESHOLD
Thesquelchdetectormeasuresthe levelofhighfrequencynoise(>40kHz)andcomparesit tothethreshold
SQTH. If thelevel is below this value, the S/N of the FM signal is consideredto be acceptable.
Valuesare given for FM with
±
50kHz deviation:
SQTH
250
119
60
35
22
S/N (dB)
0
10
15
20
25
The reset value is 60, it means a SNR of 15dB.
PROGRAMMING THE DEVICE
(continued)
STV8203
24/31
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STV8203D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:MULTISTANDARD TV SOUND DEMODULATOR |
| 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 |
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