U4224B Datasheet, PDF (14/17 Pages) TEMIC Semiconductors – Time Code Receiver

U4224B
Information Regarding US Transmitter
Station: WWVB
Frequency 60 kHz
Transmitting power 10 kW
Location: Fort Collins
Geographical coordinates: 40_ 40’N, 105_ 03’W
Time of transmission: permanent.
TIME FRAME 1 MINUTE
( index count 1 second)
TIME FRAME
0 5 10 15 20 25 30 35 40 45 50 55 0 5 10
minutes
hours
days
UTI UTI
year
sign correction
daylight savings time bits
leap second warning bit
leap year indicator bit
”0” = non leap year
”1” = leap year
Example: UTC 18.42 h
P0 40 20 10
TIME FRAME
8 4 2 1 P1
93 7529 e
20 10
8 4 2 1 P2
seconds0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
minutes
Frame reference marker
hours
Modulation:
The carrier amplitude is reduced 10 dB at the beginning
of each second and is restored in 500 ms (binary one) or
in 200 ms (binary zero).
Time Code Format:
It consists of 1 minute time frames. A time frame contains
BCD–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.
14 (17)
TELEFUNKEN Semiconductors
Rev. A3, 02-Apr-96