AK2125 GSG | Alldatasheet
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Technical content
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 sales@gsg-asia.com
Radio Controlled Clock Receiver Package The AK2125 is available in
- SOP 14 8.79 – 0.1 1.27 £ 0.635 0...10 0.20 –0.05 ‡ 0.3 4.0 6.2 – 0.2 0.42 –0.07 56 73 412 891011121314 0.25 M 0.15 + 0.2 - 0.1 £ 2.00 AK2125 Technical Data 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 Edition 09/00
Pin Symbol Pin designation
01 A2 RF output 2
02 A1 RF output 1
03 M Ground
04 E1 Antenna input
05 CK Compensation capacity
07 A Output
08 CR Charging capacitor (for control amplifier)
09 PON Stand by switch
10 CD Demodulation capacity
11 AP2 Operating point regulator 2
12 REF Reference voltage
13 E3 Booster amplifier input
14 AP1 Operating point regulator 1
Block Diagram and Application Circiut A a -V2 V3 CONTROL AMPLIFIER COMPARATORREFERENCE CURRENT SOURCE IR1 22 n 47 n 47 n 100 p VCC 100 k 100 m150 n 1 p 330 k77.5 kHz A1 A2 E3 AP2 CD CR IR2 A CKPONGND AP1 REF AK 2125 680 10 m 2 1 11 10 13 8 6593 VCC D 100 k ONOFF A VR VCC 2 09/00 AK2125
symbol min. max. unit Supply voltage V CC 0 5.25 V Output voltage V A 0 5.25 V Stand-by switch voltage PON V PON 0V CC V Junction temperature T j 150 °C Operating temperature T a -25 +85 °C Recommended Operational Conditions Supply voltage V CC 1.4 V Frequency f 50 ... 80 kHz Operational temperature T a 0 ... 55 °C RF input voltage V iE > 3 µV
Electrical Characteristics
- Test circuits Ue1 : pot core AL1100 nH/w2 ; 2 x 25 windings with 0.2 CuL 14 13 12 11 10 98 123456 7 AK 2125 AP1 47 n E3 REF AP2 150 n CD PON CR 100 m A 4.7 n VCCCKE1GNDA1A2 100 p VCC 22 n 100 k VCC 47 n 330 k 1 p Ue1E1 A 77.5 kHz VR AK2125
- 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 ; VPON = 0 V ; Ta = 25 °C unless specified otherwise min. typ. max. unit Supply voltage range 1.2 1.4 2.2 V supply voltage range 1.4 2.2 V current consumption 600 1000 µA (normal operating) current consumption ( Stand - by ) <1 10 µA Switch current I PON ( VPON = ground ) -15 -50 µA Input voltage 3 100000 µV Input impedance of the 750 k Ω RF amplifier Input impedance of the 95 k Ω booster amplifier Output impedance of the 0.3 k Ω RF segment ( A1 ) Output impedance of the 7.5 k Ω RF segment ( A2 ) Amplification RF segment A1 53 dB Range of input voltage 30 450 µV booster amplifier Internal resistance of the 70 k Ω demodulator Output voltage of the demodulator 200 mV pp Control time for ∆Vi = 0.1 mV - 1 mV 0.8 s for ∆Vi = 1 mV - 0.5 mV 5.0 s Output pulse width at transmitter pulse width =200 ms 180 195 220 ms for V R = 1.4 V, ViE = 3 µV 4 09/00 AK2125
min. typ. max. unit Output current IOH ( VR = 6 V ) 10 µA Output current IOL ( UR = 6 V ) 60 200 µA Output voltage VOL 20 200 mV ( IOL= 15 µA) 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 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 AK2125