AK2125 [GSG]
Radio Controlled Clock Receiver; 电波钟接收器
| 型号： | AK2125 |
| 厂家： | 
GUNTER SENICONDUCTOR GMBH. |
| 描述： | Radio Controlled Clock Receiver |
| 文件： | 总6页 (文件大小：69K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
GSG勁力半導体
Gunter Semiconductor GmbH
AK2125
EDITION 09/00
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
Tel : 00852-26190748
sales@gsg-asia.com
Fax: 0086-755-3355520
Fax: 00852-24948080
Hong Kong
e-mail
Edition 09/00
Radio Controlled Clock Receiver
Short Description
Features
The AK2125 bipolar manolithic integrated circuit
receives and demodulates digital time signals emitted
by time signal transmitters in the long-wave range.
• very low battery drain
• power-down mode
It is designed for low-current battery operation and can
be switched in power-down mode.
Package
The AK2125 is available in
• SOP 14
6.2 ± 0.2
8.79 ± 0.1
4.0 + 0.2
- 0.1
°
0...10
0.15
1.27
0.42 ±0.07
≤ 0.635
≥ 0.3
M
0.25
14
1
13
12
3
11
4
10
5
9
6
8
2
7
09/00
1
Pinning
SOP 14 - package
Pin
Symbol
Pin designation
01
02
03
04
05
06
A2
A1
M
E1
CK
RF output 2
RF output 1
Ground
Antenna input
Compensation capacity
Supply voltage
V
CC
07
08
09
10
11
12
13
14
A
Output
CR
PON
CD
AP2
REF
E3
Charging capacitor (for control amplifier)
Stand by switch
Demodulation capacity
Operating point regulator 2
Reference voltage
Booster amplifier input
Operating point regulator 1
AP1
Block Diagram and Application Circiut
77.5 kHz
330 k
1 p
680
100 µ
22 n
10
150 n
11
47 n
2
1
13
E3
8
A1
AP2
CR
A2
CD
14
4
AP1
E1
CONTROL AMPLIFIER
a
V3
D
A
V2
-
I
I
R1
R2
100 k
V
R
AK 2125
100 k
A
7
47 n
A
REFERENCE
CURRENT SOURCE
12 REF
COMPARATOR
V
PON
9
CK
5
GND
3
CC
6
V
CC
100 p
OFF
V
ON
10 µ
CC
2
09/00
AK2125
Absolute Maximum Ratings
symbol
min.
0
max.
5.25
unit
V
Supply voltage
V
CC
Output voltage
V
0
0
5.25
V
V
A
Stand-by switch voltage PON
Junction temperature
Operating temperature
V
V
CC
PON
T
150
+85
°C
°C
j
T
-25
a
Recommended Operational Conditions
Supply voltage
V
1.4
V
CC
Frequency
f
50 ... 80
0 ... 55
kHz
°C
Operational temperature
T
a
RF input voltage
V
> 3
µV
iE
Electrical Characteristics
1. Test circuits
V
CC
100 µ
47 n
150 n
AP2
22 n
47 n
AP1
CR
E3
13
REF
12
CD
10
PON
77.5 kHz
9
8
7
14
11
E1
Ue1
AK 2125
1 p
V
R
1 k
330 k
51
1
2
3
4
5
6
100 k
A2
A1
GND
E1
CK
V
A
CC
A
100 p
4.7 n
V
CC
2
Ue1 : pot core A 1100 nH/w ; 2 x 25 windings with 0.2 CuL
L
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
= 1.4 V ; V
= 0 V ; T = 25 °C
CC
PON a
unless specified otherwise
min.
1.2
typ.
1.4
max.
2.2
unit
V
Supply voltage range
(+5 °C < T < +55 °C)
a
supply voltage range
1.4
2.2
V
(-25 °C < T < +85 °C)
a
current consumption
(normal operating)
600
1000
µA
current consumption ( Stand - by )
<1
10
µA
µA
Switch current I
Input voltage
( V
= ground )
-15
-50
PON
PON
3
100000
µV
Input impedance of the
RF amplifier
750
95
kΩ
Input impedance of the
booster amplifier
kΩ
kΩ
kΩ
Output impedance of the
RF segment ( A1 )
0.3
7.5
53
Output impedance of the
RF segment ( A2 )
Amplification RF segment A1
dB
µV
Range of input voltage
booster amplifier
30
450
Internal resistance of the
demodulator
70
kΩ
Output voltage of the demodulator
200
mV
pp
Control time
for ∆V = 0.1 mV - 1 mV
0.8
5.0
s
s
i
for ∆V = 1 mV - 0.5 mV
i
Output pulse width
at transmitter pulse width =200 ms
180
195
220
ms
for V = 1.4 V, V = 3 µV
R
iE
4
09/00
AK2125
min.
60
typ.
max.
10
unit
µA
Output current I ( V = 6 V )
OH
R
Output current I ( U = 6 V )
200
20
µA
OL
R
Output voltage V
200
mV
OL
( I = 15 µA)
OL
Application Hints
1. RF Component
An inductive coupling of signals occurs between E1 and AP.
The output A2, with an impedance of 7.5 kΩ, has an inverted output signal ca. 5 dB lower than A1. The filter band
width of the quartz filter between A1 and E3 should be set to 20...25 Hz with a series resistance of 330 kΩ.The
associated signal attenuation of ca. 12 dB is also desirable when other filter cofigurations are applied.
2. Demodulator, Control time constants
The demodulated time signal impulses are available at CD. The time constant is CD 70 kΩ. Regulated voltage is
*
attained at the CR pin, whereby the control-time constant is determined by an internal decharging circuit and CR.
The control rate can be increased by means of an external resistor parallel to CR.
To reduce oscillating overdrive the additional connection with a series resistor of 680 Ω on the CR is
recommended.
3. Receiver circuit
The optimal supply voltage is 1.4 V. At applications with a voltage supply above 1.4 V it is better to connect V
CC
with a bias resistor so that there is about 1.4 V, whereby there is a simultaneous dynamic decoupling to other
components. The output is able to bear load resistance with working voltages of up to 5.25 V independent of V
.
CC
It is therefore advantageous to block the V - pin with a capacitor > 4.7 µF.
CC
The usual RF-technical aspects are valid for the board layout, whereby special attention should be given to the
fact that between A and E3 the greatest possible area is intended for purposes of shielding.
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