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| GSG 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 Edition 09/00 Radio Controlled Clock Receiver 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 Package The AK2124 is offered in * SOP 20 0.1 2.30 + 0.05 - 12.85 0.1 10.4 0.2 7.4 + 0.2 2.65 0...10 0.2 0.1 0.15 0.42 0.07 0.82 1.27 0.25 M 0.3 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 * Die Pad-layout 11 12 13 14 10 9 8 7 6 5 4 2 3 AK 2124 X 15 16 17 18 1 09/00 0.27 +0.05 -0.04 1 Pinning Pins 8 and 13 of the SOP 20 package are not connected. Pad 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 Pin 01 02 03 04 05 06 07 09 10 11 12 14 15 16 17 18 19 20 Symbol A2 A1 GND E2 E1 CK SR VCC A KS CR PON CD AP2 REF E3 SA AP1 Pin designation 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 77.5 kHz 330 k 680 1p 47 n 2 A1 20 5 AP1 SR E1 A a V2 7 1 A2 18 E3 150 n 16 AP2 22 n 15 CD 100 12 CR V CC - V3 D CONTROL AMPLIFIER I R1 I R2 100 k 4 E2 B V R AK 2124 47 n 17 V CC E1 E2 19 SA GND 3 OFF V CC PON 14 ON CK 6 100 p V CC 9 V CC KS 11 REF REFERENCE CURRENT SOURCE COMPARATOR A 10 100 k A 10 2 09/00 AK2124 Absolute Maximum Ratings symbol Supply voltage Output voltage Antenna switch voltage Switch controller voltage SR Stand-by switch voltage PON Junction temperature Operating temperature VCC VO VSA VSR VPON Tj Ta -25 min. 0 0 0 0 0 max. 5.25 5.25 VCC VCC VCC 150 +85 unit V V V V V C C Recommended operational conditions Supply voltage Frequency Operating temperature RF input voltage VCC f Ta ViE 1.4 50 ... 80 0 ... 55 >3 V kHz C V Electrical Characteristics 1. Test circuits V CC V CC 47 n E2 51 Ue2 1k 77.5 kHz 20 E1 51 Ue1 330 k 1k 1 A2 2 A1 3 GND 4 1p 19 18 AP1 SA E3 47 n 150 n 22 n 100 REF 17 AP2 16 CD 15 PON 14 n.c. 13 CR 12 11 KS AK 2124 5 E2 E1 6 CK 100 p 4.7 n V CC 7 SR 8 n.c. 9 V CC 10 A V R 100 k A 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. Supply voltage range (+5C < Ta < +55C) Supply voltage range (-25C < Ta < +85C) Current consumption ( normal operation ) Current consumption ( Stand - by ) Switch current IPON ( VPON = ground ) Switch current ISA ( VSA = VCC ) Switch current ISR ( VSR = VCC ) Input voltage Antenna switch attenuation Input impedance of the RF amplifier Input impedance of the booster amplifier Output impedance of the RF segment ( A1 ) Output impedance of the RF segment ( A2 ) RF segment amplification (on A1 at VSA = O V) Range of input voltage booster amplifier Internal resistance of the demodulator Output voltage of the demodulator 30 3 1.2 typ. 1.4 max. 2.2 unit V 1.4 2.2 V 600 1000 A <1 -15 5 10 10 -50 10 30 100000 A A A A V dB k 52 750 95 k 0.3 k 7.5 k 53 dB 450 V 70 k 200 mVpp 4 09/00 AK2124 min. Control time ( VSR = VCC ) for Vi = 0.1 mV - 1 mV for Vi = 1 mV - 0.5 mV Control time ( VSR = 0V ) for Vi = 0.1 mV - 1 mV for Vi = 1 mV - 0.5 mV Output pulse width ( VSR = 0 V ) at transmitter pulse width 200 ms for VR = 1.4 V, ViE = 3 V Output current IOH ( VR = 6 V ) Output current IOL ( VR = 6 V ) Output voltage VOL ( IOL = 15 A ) 60 typ. max. unit 0.8 2.0 s s 0.8 5.0 s s 180 195 220 ms 10 200 20 200 A A 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 k, 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 k. 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 k. 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 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 F. 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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