U4223B ATMEL Corporation, U4223B Datasheet
U4223B
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U4223B Summary of contents
Page 1
... Time-Code Receiver with A/D Converter Description The U4223B is a bipolar integrated straight-through receiver circuit in the frequency range of 40 kHz to 80 kHz. The device is designed for radio-controlled clock applications. Features D Very low power consumption D Very high sensitivity D High selectivity by using two crystal filters ...
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... U4223B Pin Description 1 20 VCC GND Q1A 16 5 U4223B Q1B REC 7 INT 13 8 DEC 12 9 FLA 11 10 Figure 2. Pinning IN A ferrite antenna is connected between IN and VCC. For high sensitivity, the Q factor of the antenna circuit should be as high as possible. Please note that a high Q factor requires temperature compensation of the resonant frequency in most cases ...
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... The current through the capacitor is the input signal of the decoder. 1 FLA, FLB Lowpass filter: A capacitor C and FLB suppresses higher frequencies at the trigger circuit of the decoder. FLB GND U4223B = V ) sets normal func Figure 8. is the control voltage INT ...
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... U4223B Q2A, Q2B According to Q1A/Q1B, a crystal is connected between the Pins Q2A and Q2B used with the serial resonant frequency of the time-code transmitter (e.g., 60 kHz WWVB, 77.5 kHz DCF or 40 kHz JG2AS). The equiva- lent parallel capacitor of the filter crystal is internally compensated. The value of the compensation is about ...
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... Rev. A7, 06-Mar-01 U4223B Thus, the first step in designing the antenna circuit is to measure the bandwidth. Figure 17 shows an example for the test circuit. The RF signal is coupled into the bar antenna by inductive means, e ...
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... U4223B Temperature compensation of the resonant frequency is a must if the clock is used at different temperatures. Please ask your supplier of bar antenna material and of capacitors for specified values of the temperature coefficient. Furthermore, some critical parasitics have to be consid- ered. These are shortened loops (e.g., in the ground line of the PCB board) close to the antenna and undesired loops in the antenna circuit ...
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... CC SINK I decs I dece I decst V min V max V step V swing f clk R dyn 0 0 625 Hz = 77.5 kHz U4223B Min Typ Max Unit -0 0 –24 –17 – 1.75 3 –10 dBmV 75 dBmV 5.5 dBmV 50 100 V mV ...
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... Ivcc 100k VCC STABILISATION Iin IN 1M GND Vcc 3V ~ Vin Vsb 8 (18) Ipon 300k Spon 1M 82p PON Q2B Q2A D3 U4223B Î Î TIME CONTROL DECODING AGC– AMPLIFIER RECTIFIER Q1B REC INT SB Q1A 82p 680p Vrec Srec Ssb 10M 1M Vrec Isb Irec Figure 17 ...
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... Figure 19. Example of a disturbed DCF signal Rev. A7, 06-Mar-01 Î Î Î Field strength Î Î Î Time-code signal Î Î Î Time (Gating100/s) Î Î Field strength Î Î Time (Gating100/s) U4223B (18) ...
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... Application Circuit for WWVB 60 kHz +V CC Ferrite 1 Antenna kHz res 3 RSB U4223B 60 kHz (18) Control lines ...
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... PON 16 40 kHz Microcomputer CLK Display not used connected to VCC 11 2) 40-kHz crystal can be replaced activated, PON is connected to GND 4) Voltage swing 100 mV Figure 22. U4223B Keyboard at Pin (18) ...
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... U4223B PAD Coordinates The T4223B is also available as die for “chip-on-board” mounting. DIE size: 2.26 x 2.09 mm PAD size: 100 x 100 mm (contact window mm) 300 mm " Thickness: SYMBOL X-Axis/mm IN1 128 IN 128 GND 354 SB 698 Q1A 1040 Q1B 1290 REC ...
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... R (transmission by reserve antenna), A1 (announcement of change-over to summer time), Z1 (dur- ing summer time 200 ms, otherwise 100 ms), Z2 (during standard time 200 ms, otherwise 100 ms) and A2 (announcement of leap second) transmitted between the 15th second and 19th second of the time frame. U4223B Time frame ...
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... U4223B Information on the British Transmitter Station: MSF Frequency 60 kHz Transmitting power 50 kW Location: Teddington, Middlesex year Switch over to the next time frame 0 1 500 ms 500 ms Example March 1993 seconds Modulation The carrier amplitude is switched off at the beginning of each second for a period of 100 ms (binary zero) or 200 ms (binary one) ...
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... The time-code format consists of 1-minute time frames. A time frame contains BCD-coded information of minutes, hours, days and year. In addition, there are 6 position-identifier markers (P0 thru P5) and 1 frame- reference marker with reduced carrier amplitude of 800 ms duration. U4223B Time frame daylight savings time bits ...
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... U4223B Information on the Japanese Transmitter Station: JG2AS Frequency 40 kHz Transmitting power minutes hours Example: 18. seconds minutes Frame-reference marker (FRM) Position-identifier marker P0 0.8 s 0.5 s “1” “0” Modulation The carrier amplitude is 100% at the beginning of each second and is switched off after 500 ms (binary one) or after 800 ms (binary zero) ...
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... Package Information Package SSO20 Dimensions in mm 6.75 6.50 0.25 0.65 5. Rev. A7, 06-Mar-01 5.7 5.3 4.5 4.3 1.30 0.15 0.05 6.6 6.3 11 technical drawings according to DIN specifications 10 U4223B 0.15 13007 17 (18) ...
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... U4223B Ozone Depleting Substances Policy Statement It is the policy of Atmel Germany GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment ...