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U4224B Schematic ( PDF Datasheet ) - TEMIC Semiconductors

Teilenummer U4224B
Beschreibung Time Code Receiver
Hersteller TEMIC Semiconductors
Logo TEMIC Semiconductors Logo 




Gesamt 17 Seiten
U4224B Datasheet, Funktion
Time Code Receiver
U4224B
Description
The U4224B is a bipolar integrated straight through receiver circuit in the frequency range of 40 to 80 kHz.
The device is designed for radio controlled clock applications.
Features
D Very low power consumption
D Very high sensitivity
D High selectivity by using two crystal filters
D Power down mode available
D Only a few external components necessary
D Digitalized serial output signal
D AGC hold mode
Block Diagram
GND 3
VCC 1
PON
15
Power Supply
TCO
16
93 7727 e
Decoder
11 FLB
10 FLA
9 DEC
IN 2
AGC
Amplifier
4 5 6 13
SB Q1A Q1B Q2A
14
Q2B
Rectifier & 12 SL
Integrator
7
REC
8
INT
TELEFUNKEN Semiconductors
Rev. A3, 02-Apr-96
1 (17)






U4224B Datasheet, Funktion
U4224B
Electrical Characteristics
VCC = 3 V, reference point pin 3, input signal frequency 80 kHz, Tamb = 25 _C, unless otherwise specified
Parameters
Supply voltage range
Supply current
Test Conditions / Pin
pin 1
pin 1
mwithout reception signal
with reception signal = 200 V
OFF-mode
Symbol
VCC
ICC
Min.
1.2
Typ. Max.
5.25
30
15 25
0.1
Set-up time after VCC ON VCC = 1.5 V
AGC AMPLIFIER INPUT; IN
pin 2
t2
Reception frequency range
Minimum input voltage
Maximum input voltage
WRres = 100 k , Qres > 30
Input capacitance to ground
TIMING CODE OUTPUT; TCO pin 16
fin 40
80
Vin 1 1.5
Vin 40 80
Cin 1.5
Output voltage
HIGH
LOW
Output current
HIGH
LOW
Decoding characteristics
WRLOAD = 870 k to GND
WRLOAD = 650 k to VCC
VOH
VOL
VCC - 0.4
VTCO = VCC/2
VTCO = VCC/2
DCF77 based on the values of
the application circuit
page KEIN MERKER:
TCO pulse width 100 ms
TCO pulse width 200 ms
ISOURCE
ISINK
t100
t200
3
4
60
160
10
12
90
190
0.4
130
230
Decoding characteristics
Delay compared with the
transient of the RF signal:
drop down (start transition)
rise for 100 ms pulse
(end transition)
rise for 200 ms pulse
(end transition)
WWVB based on the values of
the application circuit
page KEIN MERKER:
TCO pulse width 200 ms
TCO pulse width 500 ms
TCO pulse width 800 ms
ts
te1
te2
t200
t500
t800
30
25
10
140
440
740
60
55
30
200
500
800
Delay compared with the
transient of the RF signal:
drop down (start transition)
rise (end transition)
ts 45
te 20
80
45
Unit
V
mmmAAA
s
kHz
mV
mV
pF
V
V
mA
mA
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
6 (17)
TELEFUNKEN Semiconductors
Rev. A3, 02-Apr-96

6 Page









U4224B pdf, datenblatt
U4224B
Information Regarding German Transmitter
Station: DCF 77,
Frequency 77.5 kHz,
Transmitting power 50 kW
Location: Mainflingen/Germany,
Geographical coordinates: 50_ 0.1’N, 09_ 00’E
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
coding
when
required
Example:19.35 h
s12
4
minutes
hours
calendar day month
day of
the
week
year
93 7527
8 10 20 40 P1 1 2 4 8 10 20 P2
sec. 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
minutes
hours
Start Bit
Parity Bit P1
Parity Bit P2
Modulation:
The carrier amplitude is reduced to 25 % at the beginning
of each second for 100 ms (binary zero) or 200 ms (binary
one) duration, excepting the 59th second.
Time Code Format: (based on in-
formation of Deutsche Bundespost)
It consists of 1 minute time frames. No modulation at the
beginning of the 59th second to recognize the switch over
to the next 1 minute time frame. A time frame contains
BCD–coded information of minutes, hours, calendar day,
day of the week, month and year between the 20th second
and 58th second of the time frame, including the start bit
S (200 ms) and parity bits P1, P2 and P3. Further there are
5 additional bits R (transmission by reserve antenna), A1
(announcement of change–over to the summer time), Z1
(during the summer time 200 ms, otherwise 100 ms), Z2
(during standard time 200 ms otherwise 100 ms) and A2
(announcement of leap second) transmitted between the
15th second and 19th second of the time frame.
12 (17)
TELEFUNKEN Semiconductors
Rev. A3, 02-Apr-96

12 Page





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