GSG AK2125 Radio controlled clock receiver Datasheet

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
Fax: 0086-755-3355520
Hong Kong
Tel : 00852-26190748
Fax: 00852-24948080
e-mail
[email protected]
Technical Data
AK2125
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.
It is designed for low-current battery operation and can
be switched in power-down mode.
• very low battery drain
• power-down mode
Package
The AK2125 is available in
6.2 ± 0.2
8.79 ± 0.1
0.42 ±0.07
1.27
14
13
12
11
10
9
8
1
2
3
4
5
6
7
0.25
M
≥ 0.3
0.05
≤ 2.00
0.2 ± 0.1
0.15
≤ 0.635
09/00
+ 0.2
- 0.1
0...10°
4.0
0.20 ±
1.45 ± 0.1
• SOP 14
1
Pinning
SOP 14 - package
Pin
Symbol
Pin designation
01
02
03
04
05
06
07
08
09
10
11
12
13
14
A2
A1
M
E1
CK
VCC
A
CR
PON
CD
AP2
REF
E3
AP1
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
330 k
77.5 kHz
680
1p
47 n
14
4
100 µ
2
1
13
150 n
11
22 n
10
8
A1
A2
E3
AP2
CD
CR
AP1
E1
a
A
-
V2
V3
CONTROL AMPLIFIER
D
I
R1
I
R2
100 k
V
R
AK 2125
100 k
A
47 n
7
A
12
REFERENCE
CURRENT SOURCE
REF
COMPARATOR
GND
PON
CK
V
CC
3
9
5
6
OFF
ON
100 p
V
CC
10 µ
V
CC
2
09/00
AK2125
Absolute Maximum Ratings
symbol
min.
max.
unit
Supply voltage
VCC
0
5.25
V
Output voltage
VA
0
5.25
V
Stand-by switch voltage PON
VPON
0
VCC
V
Junction temperature
Tj
150
°C
Operating temperature
Ta
+85
°C
-25
Recommended Operational Conditions
Supply voltage
VCC
1.4
V
Frequency
f
50 ... 80
kHz
Operational temperature
Ta
0 ... 55
°C
RF input voltage
ViE
>3
µV
Electrical Characteristics
1. Test circuits
V
CC
47 n
AP1
E3
47 n
150 n
22 n
REF
AP2
CD
100 µ
PON
CR
77.5 kHz
14
E1
Ue1
51
13
12
9
10
8
AK 2125
1p
1k
11
V
R
330 k
1
2
A2
3
A1
4
GND
5
E1
6
CK
7
V
CC
A
100 k
A
100 p
4.7 n
V
CC
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,
VCC = 1.4 V ; VPON = 0 V ; Ta = 25 °C
unless specified otherwise
min.
typ.
max.
unit
Supply voltage range
(+5 °C < Ta < +55 °C)
1.2
1.4
2.2
V
supply voltage range
(-25 °C < Ta < +85 °C)
1.4
2.2
V
current consumption
(normal operating)
600
1000
µA
current consumption ( Stand - by )
<1
10
µA
Switch current IPON ( VPON = ground )
-15
-50
µA
Input voltage
3
µV
Input impedance of the
RF amplifier
750
kΩ
Input impedance of the
booster amplifier
95
kΩ
Output impedance of the
RF segment ( A1 )
0.3
kΩ
Output impedance of the
RF segment ( A2 )
7.5
kΩ
Amplification RF segment A1
53
dB
Range of input voltage
booster amplifier
30
Internal resistance of the
demodulator
450
70
µV
kΩ
Output voltage of the demodulator
200
mVpp
Control time
for ∆Vi = 0.1 mV - 1 mV
for ∆Vi = 1 mV - 0.5 mV
0.8
5.0
s
s
Output pulse width
at transmitter pulse width =200 ms
for VR = 1.4 V, ViE = 3 µV
4
100000
180
195
220
ms
09/00
AK2125
min.
typ.
Output current IOH ( VR = 6 V )
Output current IOL ( UR = 6 V )
Output voltage VOL
( IOL= 15 µA)
max.
10
60
200
20
unit
µA
µA
200
mV
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 VCC
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 VCC.
It is therefore advantageous to block the VCC - pin with a capacitor > 4.7 µF.
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.
Copying is generally permitted, indicating the source. However, our consent must be obtained in all cases. MEGAXESS reserves the
right to make changes in specifications at any time and without notice. The information and suggestions are given without obligation
and cannot give rise to any liability, they do not indicate the availability of the components mentioned. The information included
herein is believed to be accurate and reliable. However, MEGAXESS assumes no responsibility for its use; nor for any infringements
of patents or of other rights of third parties which may result from its use.
Megaxess GmbH Deutschland • POB 1370 • 15236 Frankfurt(Oder) • Germany
Phone +49 335 2005 • FAX +49 335 3251 • Internet http://www. megaxess.de
09/00
AK2125
5
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