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| GSG Gunter Semiconductor GmbH AK2127 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 TFA2127 is a bipolar integrated straight through receiver circuit in the frequency range of 50...80 kHz. The integrated circuit is designed for radio controlled clock application with high sensitivity. Features * Supply voltage range 1.2 ... 3.5 V * Very high sensitivity < 1 V * High selectivity by X-tal resonator * Start/stop-function available * Complementary output stages * Minimum external components Package 1. Die Pad-layout 11 10 12 13 14 15 16 17 18 19 12 TFA 2127 X 9 8 7 6 5 4 3 Die dimensions - die measures: 1.8 mm x 2.1 mm - bond-pad measures: 100 m x 100 m - die height: - width of scribe line: 320 m 15 m 80 m 2. SOP 16 only for test purposes 1.35 0.1 9.9 0.1 6.0 0.2 3.9 0.1 2.00 + 0.1 0.05 0...8 0.15 - 0.15 0.3 1.27 0.42 + 0.07 - 0.06 0.25 M 0.7 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 09/00 0.19 0.06 1 Pin Description Pad-No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Pin-No. (SOP 16) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 16 Symbol E3Q A2 A1 AP1 AP2 E1 VCC2 PON VCC1 OPD OPU GND1 KS SR CR CD AP3 GND3 GND2 Function Amplifier 3 input Amplifier 2, non inverting output Amplifier 2, inverting output Bias control Bias control RF input, antenna Supply voltage 2, internal band gap Stand-by and Start / Stop-switch Supply voltage 1 Output time code, pull-down Output time code, pull-up Ground (digital) Comparator threshold Clamping control input AGC time constant Low pass filter Capacitor for bias stability Ground (analog) Ground (analog) Block Diagram and Test Circuit 6.8nF GND1 47nF 22nF AP3 17 GND1 4.7F GND1 AP2 5 AP1 4 A1 3 A2 2 E3Q 1 CD 16 CR 15 14 E1 6 V1 V1 200k V2 1p UE1 V3 CONTROL AMPLIFIER SR VCC3 50 VCC1 TFA 2127 GND1 VCC2 7 POWER SUPPLY COMPARATOR 10 V3 9 VCC1 8 PON 18 GND 3 V1, V2 19 GND 2 12 GND 1 13 KS OPD 11 OPU 100k 4.7F 100k V2 V1 UE1: pot core AL1100 nH/w2 ; 2 x 25 windings with 0.2 CuL 2 09/00 TFA2127 Absolute Maximum Ratings Parameter Supply voltage 1 Supply voltage 2 Output voltage OPD Output voltage OPU Input voltage SR Input voltage PON Junction temperature Ambient temperature range Symbol VCC1 VCC2 VOPD VOPU VSR VPON Tj Tamb -25 min. 0 0 -0.3 -0.3 0 0 max. 5.25 5.25 VCC1 5.25 VCC1 VCC1 150 +70 Unit V V V V V V C C Recommended Operational Conditions Parameter Supply voltage 1 Supply voltage 2 RF input voltage Reception frequency Symbol VCC1 VCC2 ViE1 f min. 2.2 1.2 1 50 max. 3.5 1.8 50000 80 Unit V V V KHz 09/00 TFA2127 3 Electrical Characteristics Refering to the test circuit with generator signal f = 77500 5 Hz pulse modulation of RF-signal from 100 % to 25 % during modulation time t = 200 ms, VCC1 = VCC2 = 1.4 V; VPON = 0 V; Ta = 25 C, unless specified otherwise Parameter Supply voltage 1 Supply voltage 2 Supply current (VCC1 = 3.5 V) (VCC1 = 2.2 V) Supply current Supply current stand-by (VPON = VCC1) Input current stand-by switch Input current on SR Output pulse duration (OPU) 1) ViE1 = 3 V, 10 mV Output LOW-current (OPU) ViE1 = 30 V Output LOW-voltage (OPU) ViE1 = 30 V; IOL = 15 A Output HIGH-current (OPD) ViE1 = 30 V Output HIGH-voltage (OPD) ViE1 = 30 V; -IOH =15 A Sensitivity (min. RF input for tOL 180 ms)1) Symbol VCC1 VCC2 min. 2.2 1.2 typ. 3.5 1.4 max. 5.25 1.8 Unit V V ICC11 ICC12 ICC2 ICC10 400 400 300 540 530 500 0.03 690 690 640 1 A A A A -IPON -ISR tOL 180 14 0.3 190 20 2 220 A A ms IOL 100 200 A VOL 45 200 mV -IOH 100 330 A VOH 1.1 1.3 V ViE1 0.8 1 V 1) Test in a special application circuit without socket. 4 09/00 TFA2127 Application Circuit With TFA2127 in SOP 16 for DCF-Receiver OPU 47n 22n 4.7 OPD 100k 16 15 14 13 12 11 10 9 100k TFA 2127 1 2 3 4 5 6 7 8 VS = 1.5 V 77.5 kHz 6.8n 4.7 FERRITE ANTENNA 100n * Switch on ground: Start, Power on Switch open or on VCC: Stop, Stand-by STAND BY * Application Information The PCB has to be designed for RF conditions. To achieve a high selectivity the parasitic parallel capacitance of the X-tal resonator should be 1...1.5 pF. For a trouble-free reception the capacitors on VCC2 and AP3 have to be arranged nearby the chip food prints. The dimensioning of the antenna resonant resistance is a compromise between high signal voltage and low antenna noise voltage. Q factor of antenna should be high for attenuation of interference signals. In the application circuit is Rres < 100 k; Q = 80. |
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