GSG
勁力
AK2124
EDITION 09/00
半導½
Gunter
Semiconductor
GmbH
Receiver/Demodulator for time code
signals transmitted by the
transmitters DCF77 ( Germany) ,
MSF (UK), or WWVB (USA)
For inquiry please contact :
China
Tel: 0086-755-3200442
Fax: 0086-755-3355520
Hong Kong
Tel : 00852-26190748
Fax: 00852-24948080
e-mail
sales@gsg-asia.com
Edition 09/00
Radio Controlled Clock Receiver
Short Description
The AK2124 bipolar monolithic integrated circuit receives
and demodulates digital time signals emitted by time
signal transmitters in the long-wave range. It is designed
for low-current battery operation and can be switched in
power-down mode. Due to the possibility of connecting
two antennas a position-independent stable operation is
guaranteed. The circuit is thus capable of the selective
reception of various time signal transmitters.
Features
• very low battery drain
• power-down mode
• two antennas connectable
• several transmitters receivable
Package
The AK2124 is offered in
• SOP 20
0.1
2.30
+ 0.05
-
12.85
±
0.1
10.4
±
0.2
7.4 + 0.2
≤
2.65
0...10°
0.2
±
0.1
0.15
0.42
±0.07
≤
0.82
1.27
0.25
M
≥
0.3
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
• Die
Pad-layout
11
12
13
14
10
9
8
7
6
5
4
2
3
AK 2124 X
15
16 17 18 1
09/00
0.27
+0.05
-0.04
1
Pinning
Pins 8 and 13 of the SOP 20 package are not connected.
Pad
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
Pin
01
02
03
04
05
06
07
09
10
11
12
14
15
16
17
18
19
20
Symbol
A2
A1
GND
E2
E1
CK
SR
V
CC
A
KS
CR
PON
CD
AP2
REF
E3
SA
AP1
Pin designation
RF - output 2
RF - output 1
Ground
Antenna input 2
Antenna input 1
Compensation capacity
Switch controller
Supply voltage
Output
Comparator threshold
Charging capacitor (for control amplifier)
Stand - by switch
Demodulation capacity
Operating point regulator 2
Reference voltage
Booster amplifier input
Antenna change-over switch
Operating point regulator 1
Block Diagram and Application Circuit
77.5 kHz
330 k
680
1p
47 n
2
A1
20
5
AP1
SR
E1
A
a
V2
7
1
A2
18
E3
150 n
16
AP2
22 n
15
CD
100
µ
12
CR
V
CC
-
V3
D
CONTROL AMPLIFIER
I
R1
I
R2
100 k
4
E2
B
V
R
AK 2124
47 n
17
V
CC
E1
E2
19
SA
GND
3
OFF
V
CC
PON
14
ON
CK
6
100 p
V
CC
9
V
CC
KS
11
REF
REFERENCE
CURRENT SOURCE
COMPARATOR
A
10
100 k
A
10
µ
2
09/00
AK2124
Absolute Maximum Ratings
symbol
Supply voltage
Output voltage
Antenna switch voltage
Switch controller voltage SR
Stand-by switch voltage PON
Junction temperature
Operating temperature
V
CC
V
O
V
SA
V
SR
V
PON
T
j
T
a
-25
min.
0
0
0
0
0
max.
5.25
5.25
V
CC
V
CC
V
CC
150
+85
unit
V
V
V
V
V
°C
°C
Recommended operational conditions
Supply voltage
Frequency
Operating temperature
RF input voltage
V
CC
f
T
a
V
iE
1.4
50 ... 80
0 ... 55
>3
V
kHz
°C
µV
Electrical Characteristics
1. Test circuits
V
CC
V
CC
47 n
E2
51
Ue2
1k
77.5 kHz
20
E1
51
Ue1
330 k
1k
1
A2
2
A1
3
GND
4
1p
19
18
AP1
SA
E3
47 n
150 n
22 n
100
µ
REF
17
AP2
16
CD
15
PON
14
n.c.
13
CR
12
11
KS
AK 2124
5
E2
E1
6
CK
100 p
4.7 n
V
CC
7
SR
8
n.c.
9
V
CC
10
A
V
R
100 k
A
V
CC
2
Ue1 , Ue2 : pot core A 1100 nH/w ; 2 x 25 windings with 0.2 CuL
L
09/00
AK2124
3
2. Parameters
Refering to the test circuit with generator signal
f = 77500 Hz ± 5 Hz
pulse modulation of RF-signal from 100% to 25 %
during modulation time t = 200 ms,
V
CC
= 1.4 V ; V
PON
= 0 V ; T
a
= 25 °C
unless specified otherwise
min.
Supply voltage range
(+5°C < T
a
< +55°C)
Supply voltage range
(-25°C < T
a
< +85°C)
Current consumption
( normal operation )
Current consumption ( Stand - by )
Switch current I
PON
( V
PON
= ground )
Switch current I
SA
( V
SA
= V
CC
)
Switch current I
SR
( V
SR
= V
CC
)
Input voltage
Antenna switch attenuation
Input impedance of the
RF amplifier
Input impedance of the
booster amplifier
Output impedance of the
RF segment ( A1 )
Output impedance of the
RF segment ( A2 )
RF segment amplification
(on A1 at V
SA
= O V)
Range of input voltage
booster amplifier
Internal resistance of the
demodulator
Output voltage of the demodulator
30
3
1.2
typ.
1.4
max.
2.2
unit
V
1.4
2.2
V
600
1000
µA
<1
-15
5
10
10
-50
10
30
100000
µA
µA
µA
µA
µV
dB
kΩ
52
750
95
kΩ
0.3
kΩ
7.5
kΩ
53
dB
450
µV
70
kΩ
200
mVpp
4
09/00
AK2124
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
