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 [email protected] Technical Data AK2125 Edition 09/00 Radio Controlled Clock Receiver Short Description Features 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. • very low battery drain • power-down mode Package The AK2125 is available in 6.2 ± 0.2 8.79 ± 0.1 0.42 ±0.07 1.27 14 13 12 11 10 9 8 1 2 3 4 5 6 7 0.25 M ≥ 0.3 0.05 ≤ 2.00 0.2 ± 0.1 0.15 ≤ 0.635 09/00 + 0.2 - 0.1 0...10° 4.0 0.20 ± 1.45 ± 0.1 • SOP 14 1 Pinning SOP 14 - package Pin Symbol Pin designation 01 02 03 04 05 06 07 08 09 10 11 12 13 14 A2 A1 M E1 CK VCC A CR PON CD AP2 REF E3 AP1 RF output 2 RF output 1 Ground Antenna input Compensation capacity Supply voltage Output Charging capacitor (for control amplifier) Stand by switch Demodulation capacity Operating point regulator 2 Reference voltage Booster amplifier input Operating point regulator 1 Block Diagram and Application Circiut 330 k 77.5 kHz 680 1p 47 n 14 4 100 µ 2 1 13 150 n 11 22 n 10 8 A1 A2 E3 AP2 CD CR AP1 E1 a A - V2 V3 CONTROL AMPLIFIER D I R1 I R2 100 k V R AK 2125 100 k A 47 n 7 A 12 REFERENCE CURRENT SOURCE REF COMPARATOR GND PON CK V CC 3 9 5 6 OFF ON 100 p V CC 10 µ V CC 2 09/00 AK2125 Absolute Maximum Ratings symbol min. max. unit Supply voltage VCC 0 5.25 V Output voltage VA 0 5.25 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 Operational temperature Ta 0 ... 55 °C RF input voltage ViE >3 µV Electrical Characteristics 1. Test circuits V CC 47 n AP1 E3 47 n 150 n 22 n REF AP2 CD 100 µ PON CR 77.5 kHz 14 E1 Ue1 51 13 12 9 10 8 AK 2125 1p 1k 11 V R 330 k 1 2 A2 3 A1 4 GND 5 E1 6 CK 7 V CC A 100 k A 100 p 4.7 n V CC 2 Ue1 : pot core AL1100 nH/w ; 2 x 25 windings with 0.2 CuL 09/00 AK2125 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. unit 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 operating) 600 1000 µA current consumption ( Stand - by ) <1 10 µA Switch current IPON ( VPON = ground ) -15 -50 µA Input voltage 3 µV 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 Amplification RF segment A1 53 dB Range of input voltage booster amplifier 30 Internal resistance of the demodulator 450 70 µV kΩ Output voltage of the demodulator 200 mVpp Control time for ∆Vi = 0.1 mV - 1 mV for ∆Vi = 1 mV - 0.5 mV 0.8 5.0 s s Output pulse width at transmitter pulse width =200 ms for VR = 1.4 V, ViE = 3 µV 4 100000 180 195 220 ms 09/00 AK2125 min. typ. Output current IOH ( VR = 6 V ) Output current IOL ( UR = 6 V ) Output voltage VOL ( IOL= 15 µA) max. 10 60 200 20 unit µA µA 200 mV 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 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 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 09/00 AK2125 5