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參數(shù)資料
| 型號： | STV1601A |
| 廠商： | 意法半導體 |
| 英文描述： | SERIAL INTERFACE TRANSMISSION ENCODER |
| 中文描述： | 串行接口傳輸編碼器 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 244K |
| 代理商： | STV1601A |
25
D0Y
D0X
V
STV1601A
24
23
22
D1X
D1Y
EE
6
21
8-bit Parallel Data
10k
1
Figure14 :
8-bit Parallel Input Data (ECLlevel)
The conversion algorithm detects 2 successive
000H words andsetsthe twoLSBs of the previous
word,which is supposedto be FF, according to the
standard.
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
Input Data
Fixed Data
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
MSB
LSB
Input Order
Parallel Data after Conversion
Input ParallelData
1
Figure10 :
Conversionfrom 8-bit TRS to
10-bit TRS
Conversion in the case of more than three succes-
sive ”000H” words.
If more than 3 consecutive words of 000 in D1
standard, or 4 consecutive words of 000 in D2
standardoccur at the parallelinput (illegal accord-
ing to the standard), thus no proper operation is
possible.
5. Scramblingand NRZ to NRZI conversion
Figures16 and 17 show the scrambling circuit,the
scrambling polynomialis as follows : x
9
+ x
4
+ 1.
D1
D2
D3
D4
D5
D6
D7
D8
D9
1
Figure16 :
(x
9
+ x
4
+1) Basic Scrambling Circuit
D1
D2
D3
D4
D5
D6
D7
D8
D9
1
Figure 17 :
(x
9
+ x
4
+1) Basic Scrambling Circuit
To eliminatesignal polarityofscrambleddata, con-
versionfromNRZto NRZI isperformed (Figures18
and 19).
Therefore, the polarity for output distribution or
receiving is not needed. This allows easy system
design. The NRZ to NRZI polynominalis x + 1.
VCO temperature compensation and oscillation
frequencyadjustment
VCO oscillation frequency depends on the tem-
perature as shown in Figures 22 and 23 ”Repre-
sentative characteristics examples”. Within the
normal range of operation, frequency increases
with temperature.FV voltage remains almost con-
stant regardless of temperature.Figure 20 shows
an exampleof atemperature compensationcircuit
using a diode (transistor with C-B diode short-cir-
cuited) and a resistorconnected between FV and
V
EE
. Examplesof representativecharacteristicsfor
various temperaturesare shown in Figures 22 and
23concerningoscillationfrequencyandPLLpull-in
range (signal frequency 270, 177and 143MHz).
VCO free running frequencyadjustment
VCO free running frequency adjustment is per-
formed at room temperature.
If TN1 is set High, VCO free runs. Wait for 5 to
10 minutes after turning power supply ON (warm
up time). While monitoring PCK output (Pin 36)
adjust the signal frequency (within
±
1%) with the
variable resistor connectedbetween FV andV
EE
.
STV1601A
13/17
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