 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| GSG 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 Edition 09/00 Radio Controlled Clock Receiver 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 Package The AK2125 is available in * SOP 14 1.45 0.1 8.79 0.1 6.2 0.2 4.0 + 0.2 - 0.1 0.2 0.1 2.00 0...10 0.15 0.635 1.27 0.42 0.07 0.25 M 0.3 14 13 12 11 10 9 8 1 2 3 4 5 6 7 09/00 0.20 0.05 1 Pinning SOP 14 - package Pin 01 02 03 04 05 06 07 08 09 10 11 12 13 14 Symbol A2 A1 M E1 CK VCC A CR PON CD AP2 REF E3 AP1 Pin designation 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 77.5 kHz 330 k 680 1p 150 n 11 AP2 22 n 10 CD 100 8 CR 47 n 2 A1 14 4 AP1 E1 1 A2 13 E3 A a V2 - V3 D CONTROL AMPLIFIER I R1 I R2 100 k V R 100 k 47 n 12 REF REFERENCE CURRENT SOURCE COMPARATOR A 7 A AK 2125 GND 3 OFF V CC PON 9 ON CK 5 100 p V CC 6 V CC 10 2 09/00 AK2125 Absolute Maximum Ratings symbol Supply voltage Output voltage Stand-by switch voltage PON Junction temperature Operating temperature VCC VA VPON Tj Ta -25 min. 0 0 0 max. 5.25 5.25 VCC 150 +85 unit V V V C C Recommended Operational Conditions Supply voltage Frequency Operational 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 47 n 47 n 150 n 22 n 100 AP1 77.5 kHz 14 E1 51 Ue1 1k 330 k 1 A2 1p E3 13 REF 12 AP2 11 CD 10 9 PON CR 8 AK 2125 2 A1 3 GND 4 E1 5 CK 100 p 4.7 n V CC 6 V CC 7 A V R 100 k A 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. Supply voltage range (+5 C < Ta < +55 C) supply voltage range (-25 C < Ta < +85 C) current consumption (normal operating) current consumption ( Stand - by ) Switch current IPON ( VPON = ground ) Input voltage 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 ) Amplification RF segment A1 Range of input voltage booster amplifier Internal resistance of the demodulator Output voltage of the demodulator Control time for Vi = 0.1 mV - 1 mV for Vi = 1 mV - 0.5 mV Output pulse width at transmitter pulse width =200 ms for VR = 1.4 V, ViE = 3 V 30 3 1.2 typ. 1.4 max. 2.2 unit V 1.4 2.2 V 600 1000 A <1 -15 10 -50 100000 A A V k 750 95 k 0.3 k 7.5 k 53 450 dB V 70 k 200 mVpp 0.8 5.0 s s 180 195 220 ms 4 09/00 AK2125 min. Output current IOH ( VR = 6 V ) Output current IOL ( UR = 6 V ) Output voltage VOL ( IOL= 15 A) 60 typ. max. 10 unit A A 200 20 200 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 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 cofigurations are applied. 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 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 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 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. |
Price & Availability of AK2125
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |