GSG AK2124

GSG 勁力
半導体
Gunter Semiconductor GmbH
AK2124
EDITION 09/00
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
[email protected]
Technical Data
AK2124
Edition 09/00
Radio Controlled Clock Receiver
Short Description
Features
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.
• very low battery drain
• power-down mode
• two antennas connectable
• several transmitters receivable
Package
The AK2124 is offered in
12.85 ± 0.1
0.1
2.30 +- 0.05
10.4 ± 0.2
7.4 + 0.2
≤ 0.82
• Die
Pad-layout
0.27
0.15
0.42 ±0.07
1.27
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
10
9
0.25
M
≥ 0.3
8
7
AK 2124 X
15
16 17 18 1
09/00
+0.05
-0.04
0.2 ± 0.1
0...10°
≤ 2.65
• SOP 20
6
5
4
2
3
1
Pinning
Pins 8 and 13 of the SOP 20 package are not connected.
Pad
Pin
Symbol
Pin designation
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
01
02
03
04
05
06
07
09
10
11
12
14
15
16
17
18
19
20
A2
A1
GND
E2
E1
CK
SR
VCC
A
KS
CR
PON
CD
AP2
REF
E3
SA
AP1
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
330 k
77.5 kHz
680
1p
47 n
20
100 µ
2
1
18
150 n
16
22 n
15
12
A1
A2
E3
AP2
CD
CR
V
CC
AP1
SR
5
E1
a
A
-
V2
CONTROL AMPLIFIER
D
V3
7
I
R1
I
R2
100 k
4
V
R
E2
B
AK 2124
100 k
A
47 n
17
V
CC
E2
E1
19
REFERENCE
CURRENT SOURCE
REF
SA
GND
PON
CK
V
CC
3
14
6
9
OFF
ON
100 p
10
A
COMPARATOR
KS
V
CC
11
10 µ
V
CC
2
09/00
AK2124
Absolute Maximum Ratings
symbol
min.
max.
unit
Supply voltage
VCC
0
5.25
V
Output voltage
VO
0
5.25
V
Antenna switch voltage
VSA
0
VCC
V
Switch controller voltage SR
VSR
0
VCC
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
Operating temperature
Ta
0 ... 55
°C
RF input voltage
ViE
>3
µV
Electrical Characteristics
1. Test circuits
V
CC
V
CC
47 n
E2
47 n
150 n
22 n
REF
AP2
CD
Ue2
51
1k
AP1
SA
E3
77.5 kHz
20
E1
Ue1
330 k
51
100 µ
19
18
17
16
PON
n.c.
CR
KS
15
14
13
12
11
6
7
8
9
10
AK 2124
1p
1k
1
2
A2
3
A1
4
GND
5
E2
E1
CK
SR
n.c.
V
CC
V
R
A
100 k
A
100 p
4.7 n
V
CC
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,
VCC = 1.4 V ; VPON = 0 V ; Ta = 25 °C
unless specified otherwise
min.
typ.
max.
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 operation )
600
1000
µA
Current consumption ( Stand - by )
<1
10
µA
Switch current IPON ( VPON = ground )
-15
-50
µA
Switch current ISA ( VSA = VCC )
5
10
µA
Switch current ISR ( VSR = VCC )
10
30
µA
100000
µV
Input voltage
3
Antenna switch attenuation
52
dB
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
RF segment amplification
(on A1 at VSA = O V)
53
dB
Range of input voltage
booster amplifier
Internal resistance of the
demodulator
Output voltage of the demodulator
4
unit
30
450
µV
70
kΩ
200
mVpp
09/00
AK2124
min.
typ.
max.
unit
Control time ( VSR = VCC )
for ∆Vi = 0.1 mV - 1 mV
for ∆Vi = 1 mV - 0.5 mV
0.8
2.0
s
s
Control time ( VSR = 0V )
for ∆Vi = 0.1 mV - 1 mV
for ∆Vi = 1 mV - 0.5 mV
0.8
5.0
s
s
Output pulse width ( VSR = 0 V )
at transmitter pulse width 200 ms
for VR = 1.4 V, ViE = 3 µV
180
195
Output current IOH ( VR = 6 V )
Output current IOL ( VR = 6 V )
Output voltage VOL
( IOL = 15 µA )
60
220
ms
10
µA
200
20
µA
200
mV
Application Hints
1. RF Component
An inductive coupling of signals between E1, E2 and AP1 is essential to establishing the given switch-over
attenuation.
The SA switch-over point is ca. 0.8 V.
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 configurations are
applied. When the AK2124 is used as a dual standard receiver, antenna switch-over with SA is necessary, as is
filtering with two different crystals from outputs A1 to E3, or A2 to E3.
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 pin CR, whereby the control-time constant is determined by a switchable
decharging circuit and CR.
The control rate is regulated at SR. A larger control-time constant functions at VSR = O V than at VSR = VCC.
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 PCB 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
AK2124
5