AK2124 GSG | Alldatasheet
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Technical content
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 sales@gsg-asia.com
Radio Controlled Clock Receiver Package The AK2124 is offered in
- SOP 20 Technical Data 0...10 0.27 +0.05-0.04 ‡ 0.3 14 13 12 1120 19 18 17 16 15 567891 03412 12.85 – 0.1 0.42 –0.07 7.4 + 0.2 10.4 – 0.2 1.27£ 0.82 0.25 M 0.15 2.30+ 0.1 - 0.050.2 – 0.1 £ 2.65 AK2124 16 17 18 1 2 3 AK 2124 X 11 10 9 8 Short Description 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.
Features
- very low battery drain
- power-down mode
- two antennas connectable
- several transmitters receivable Edition 09/00
- Die Pad-layout
Pins 8 and 13 of the SOP 20 package are not connected. Pad Pin Symbol Pin designation 01 01 A2 RF - output 2 02 02 A1 RF - output 1 03 03 GND Ground 04 04 E2 Antenna input 2 05 05 E1 Antenna input 1 06 06 CK Compensation capacity 07 07 SR Switch controller 08 09 V CC Supply voltage 09 10 A Output 10 11 KS Comparator threshold 11 12 CR Charging capacitor (for control amplifier) 12 14 PON Stand - by switch 13 15 CD Demodulation capacity 14 16 AP2 Operating point regulator 2 15 17 REF Reference voltage 16 18 E3 Booster amplifier input 17 19 SA Antenna change-over switch 18 20 AP1 Operating point regulator 1 Block Diagram and Application Circuit A B 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 SR IR2 A KSCKPONGNDSA AP1 REF AK 2124 680 VCC 10 m VCC 2 1 1618 15 12 1196143 VCC ONOFF D 100 k VCC VR A 2 09/00 AK2124
symbol min. max. unit Supply voltage V CC 0 5.25 V Output voltage V O 0 5.25 V Antenna switch voltage V SA 0V CC V Switch controller voltage SR V SR 0V CC 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 Operating temperature T a 0 ... 55 °C RF input voltage V iE > 3 µV
Electrical Characteristics
- Test circuits AK2124 Ue1 , Ue2 : pot core AL1100 nH/w2 ; 2 x 25 windings with 0.2 CuL VCC 20 19 18 17 16 15 14 13 12 11 123456 7 8 9 10 AK 2124 AP1 47 n SA E3 REF AP2 150 n CD PON n.c. CR 100 m KS A 4.7 n VCCn.c.SRCKE1E2GNDA1A2 VCC 100 p VCC 22 n VCC 47 n 330 k 1 p 1 k Ue1 Ue2E2 1 k51 A 77.5 kHz VR 100 k
- 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 operation ) Current consumption ( Stand - by ) <1 10 µA Switch current I PON ( VPON = ground ) -15 -50 µA Switch current ISA ( VSA = VCC ) 5 10 µA Switch current ISR ( VSR = VCC )1 0 3 0 µ A Input voltage 3 100000 µV Antenna switch attenuation 52 dB 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 ) RF segment amplification 53 dB (on A1 at V SA = O V) Range of input voltage 30 450 µV booster amplifier Internal resistance of the 70 k Ω demodulator Output voltage of the demodulator 200 mVpp 4 09/00 AK2124
min. typ. max. unit Control time ( VSR = VCC ) for ∆Vi = 0.1 mV - 1 mV 0.8 s for ∆Vi = 1 mV - 0.5 mV 2.0 s Control time ( VSR = 0V ) for ∆Vi = 0.1 mV - 1 mV 0.8 s for ∆Vi = 1 mV - 0.5 mV 5.0 s Output pulse width ( VSR = 0 V ) at transmitter pulse width 200 ms 180 195 220 ms for VR = 1.4 V, ViE = 3 µV Output current IOH ( VR = 6 V ) 10 µA Output current IOL ( VR = 6 V ) 60 200 µA Output voltage VOL 20 200 mV ( IOL = 15 µA ) 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 SR = 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 V CC. 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 AK2124