GSG
勁力
AK2125
EDITION 09/00
半導½
Gunter
Semiconductor
GmbH
Receiver/ Demodulator for time
code signals transmitted by the
transmitter 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 AK2125 bipolar manolithic 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.
Features
• very low battery drain
• power-down mode
Package
The AK2125 is available in
• SOP 14
1.45
±
0.1
8.79
±
0.1
6.2
±
0.2
4.0
+ 0.2
- 0.1
0.2
±
0.1
≤
2.00
0...10°
0.15
≤
0.635
1.27
0.42
±0.07
0.25
M
≥
0.3
14
13
12
11
10
9
8
1
2
3
4
5
6
7
09/00
0.20
±
0.05
1
Pinning
SOP 14 - package
Pin
01
02
03
04
05
06
07
08
09
10
11
12
13
14
Symbol
A2
A1
M
E1
CK
V
CC
A
CR
PON
CD
AP2
REF
E3
AP1
Pin designation
RF output 2
RF output 1
Ground
Antenna input
Compensation capacity
Supply voltage
Output
Charging capacitor (for control amplifier)
Stand by switch
Demodulation capacity
Operating point regulator 2
Reference voltage
Booster amplifier input
Operating point regulator 1
Block Diagram and Application Circiut
77.5 kHz
330 k
680
1p
150 n
11
AP2
22 n
10
CD
100
µ
8
CR
47 n
2
A1
14
4
AP1
E1
1
A2
13
E3
A
a
V2
-
V3
D
CONTROL AMPLIFIER
I
R1
I
R2
100 k
V
R
100 k
47 n
12
REF
REFERENCE
CURRENT SOURCE
COMPARATOR
A
7
A
AK 2125
GND
3
OFF
V
CC
PON
9
ON
CK
5
100 p
V
CC
6
V
CC
10
µ
2
09/00
AK2125
Absolute Maximum Ratings
symbol
Supply voltage
Output voltage
Stand-by switch voltage PON
Junction temperature
Operating temperature
V
CC
V
A
V
PON
T
j
T
a
-25
min.
0
0
0
max.
5.25
5.25
V
CC
150
+85
unit
V
V
V
°C
°C
Recommended Operational Conditions
Supply voltage
Frequency
Operational 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
47 n
47 n
150 n
22 n
100
µ
AP1
77.5 kHz
14
E1
51
Ue1
1k
330 k
1
A2
1p
E3
13
REF
12
AP2
11
CD
10
9
PON
CR
8
AK 2125
2
A1
3
GND
4
E1
5
CK
100 p
4.7 n
V
CC
6
V
CC
7
A
V
R
100 k
A
2
Ue1 : pot core AL1100 nH/w ; 2 x 25 windings with 0.2 CuL
09/00
AK2125
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 operating)
current consumption ( Stand - by )
Switch current I
PON
( V
PON
= ground )
Input voltage
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 )
Amplification RF segment A1
Range of input voltage
booster amplifier
Internal resistance of the
demodulator
Output voltage of the demodulator
Control time
for
∆V
i
= 0.1 mV - 1 mV
for
∆V
i
= 1 mV - 0.5 mV
Output pulse width
at transmitter pulse width =200 ms
for V
R
= 1.4 V, V
iE
= 3 µV
30
3
1.2
typ.
1.4
max.
2.2
unit
V
1.4
2.2
V
600
1000
µA
<1
-15
10
-50
100000
µA
µA
µV
kΩ
750
95
kΩ
0.3
kΩ
7.5
kΩ
53
450
dB
µV
70
kΩ
200
mV
pp
0.8
5.0
s
s
180
195
220
ms
4
09/00
AK2125
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