AK2124 [GSG]
Radio Controlled Clock Receiver; 电波钟接收器
| 型号： | AK2124 |
| 厂家： | 
GUNTER SENICONDUCTOR GMBH. |
| 描述： | Radio Controlled Clock Receiver |
| 文件： | 总6页 (文件大小：76K) |
| 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
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
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 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
10.4 ± 0.2
• SOP 20
7.4 + 0.2
0.15
1.27
≤ 0.82
0.42 ±0.07
≥ 0.3
M
0.25
20 19 18 17 16 15 14 13 12 11
1
2
3
4
5
6
7
8
9
10
• Die
Pad-layout
11
10
9
8
7
12
6
5
4
13
14
15
AK 2124 X
16 17 18
1
2
3
09/00
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
01
02
03
04
05
06
07
09
A2
A1
GND
E2
E1
RF - output 2
RF - output 1
Ground
Antenna input 2
Antenna input 1
Compensation capacity
Switch controller
Supply voltage
CK
SR
V
CC
09
10
11
12
13
14
15
16
17
18
10
11
12
14
15
16
17
18
19
20
A
KS
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
CR
PON
CD
AP2
REF
E3
SA
AP1
Block Diagram and Application Circuit
77.5 kHz
330 k
680
1 p
100 µ
22 n
15
150 n
16
47 n
1
18
E3
2
12
A1
AP2
CR
A2
CD
V
CC
20
5
AP1
E1
SR
7
CONTROL AMPLIFIER
a
V3
D
A
V2
-
I
I
R1
R2
100 k
V
4
E2
R
B
AK 2124
100 k
A
10
A
47 n
V
REFERENCE
17 REF
E2
19
COMPARATOR
CURRENT SOURCE
CC
SA
E1
V
PON
14
CK
6
KS
11
GND
3
CC
9
V
CC
OFF
V
ON
100 p
10 µ
CC
2
09/00
AK2124
Absolute Maximum Ratings
symbol
min.
0
max.
5.25
unit
V
Supply voltage
V
CC
Output voltage
V
0
0
0
0
5.25
V
V
O
Antenna switch voltage
Switch controller voltage SR
Stand-by switch voltage PON
Junction temperature
Operating temperature
V
V
CC
SA
V
V
V
SR
CC
V
V
V
PON
CC
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
Operating temperature
T
a
RF input voltage
V
> 3
µV
iE
Electrical Characteristics
1. Test circuits
V
V
CC
CC
100 µ
47 n
150 n
AP2
22 n
47 n
AP1
E2
Ue2
1 k
51
SA
E3
REF
17
CD
15
PON
n.c.
CR
12
KS
77.5 kHz
330 k
14
16
13
11
10
20
19
18
E1
Ue1
1 p
AK 2124
1 k
51
V
R
1
2
3
4
5
6
8
7
9
A
A2
A1
GND
E2
E1
CK
SR
n.c.
V
100 k
CC
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
3
AK2124
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 operation )
600
1000
µA
Current consumption ( Stand - by )
<1
10
µA
µA
Switch current I
( V
= ground )
-15
-50
PON
PON
Switch current I ( V = V
CC
)
)
5
10
30
µA
µA
SA
SA
Switch current I ( V = V
CC
10
SR
SR
Input voltage
3
100000
µV
dB
kΩ
Antenna switch attenuation
52
Input impedance of the
RF amplifier
750
Input impedance of the
booster amplifier
95
0.3
7.5
53
kΩ
kΩ
kΩ
dB
Output impedance of the
RF segment ( A1 )
Output impedance of the
RF segment ( A2 )
RF segment amplification
(on A1 at V = O V)
SA
Range of input voltage
booster amplifier
30
450
µV
kΩ
Internal resistance of the
demodulator
70
Output voltage of the demodulator
200
mVpp
4
09/00
AK2124
min.
typ.
max.
unit
Control time ( V = V
)
SR
CC
for ∆V = 0.1 mV - 1 mV
0.8
2.0
s
s
i
for ∆V = 1 mV - 0.5 mV
i
Control time ( V = 0V )
SR
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 ( V = 0 V )
SR
at transmitter pulse width 200 ms
180
60
195
220
10
ms
for V = 1.4 V, V = 3 µV
R
iE
Output current I ( V = 6 V )
µA
µA
mV
OH
R
Output current I ( V = 6 V )
200
20
OL
R
Output voltage V
200
OL
( I = 15 µA )
OL
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 V = O V than at V = V .
SR
SR
CC
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 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.
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