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參數(shù)資料
| 型號(hào)： | T4227-DDT |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, UUC12 |
| 封裝： | DIE-12 |
| 文件頁(yè)數(shù)： | 2/13頁(yè) |
| 文件大?。?/td> | 105K |
| 代理商： | T4227-DDT |
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T4227
Rev. A2, 24-Jul-00
Preliminary Information
10 (13)
Information on the US Transmitter
(Customer is responsible to verify the information!)
Station: WWVB
Frequency 60 kHz
Transmitting power 10 kW
Location: Fort Collins
Geographical coordinates: 40
_ 40’N, 105_ 03’W
Time of transmission: permanent
0
510
20
25
30
40
50
55
0
510
Time frame
35
45
P0
40 20 10
8
421
P1
0
1
2
35
4
6
7
89
10 11 12 13 14 15 16 17 18 19 20
P2
20 10
8421
hours
15
minutes
days
FR
M
20 10
40
4 2 1 P1
8
10
20
8 4 2 1 P2
10
0
200
40 20 10
80
P3 8 4 2 1
AD
D
SU
B
AD
D
P4 800 400 200 100
80 40 20 10 P5
8 4 2 1
P0
UTI UTI
sign
correction
year
daylight savings time bits
leap second warning bit
leap year indicator bit
“0” = non leap year
“1” = leap year
Time frame 1 minute
( index count 1 second)
Frame-reference marker
seconds
93 7529 e
Example: UTC 18.42 h
Time frame
Figure 17.
Modulation
The carrier amplitude is reduced by 10 dB at the
beginning of each second and is restored within 500 ms
(binary one) or within 200 ms (binary zero).
Time-Code Format
The time-code format consists of 1-minute time frames.
A time frame contains BCD1–coded information of
minutes, hours, days and year. In addition, there are
6 position-identifier
markers
(P0
thru
P5)
and
1 frame-reference marker with reduced carrier amplitude
of 800 ms duration.
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