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U4221B

TEMIC Semiconductors
Part Number U4221B
Manufacturer TEMIC Semiconductors
Description Radio Controlled Clock Receiver
Published Nov 21, 2011
Detailed Description www.DataSheet.co.kr U4221B Radio Controlled Clock Receiver Description The U4221B is a bipolar integrated straight thro...
Datasheet PDF File U4221B PDF File

U4221B
U4221B

Overview
www.
DataSheet.
co.
kr U4221B Radio Controlled Clock Receiver Description The U4221B is a bipolar integrated straight through receiver circuit in the frequency range of 60 to 80 kHz.
The device is designed for radio controlled clock application.
Features D Low power consumption D Very high sensitivity D High selectivity by quartz resonator D Stop-function available D Only a few external components necessary D Digitized serial output signal Block Diagram PON 14 TCO 13 FSI 12 NC 10 VCCD 9 VCCA 16 Power supply Driver Comparator FSS 11 GND 15 AGC CAGC 4 IN2 1 IN1 2 Amplifier 1 Amplifier 2 Demodulator 3 GND (analog) 8 OUTA1 6 INA2 Figure 1.
7 GND (digital) 5 CDEM 93 7506 e TELEFUNKEN Semiconductors Rev.
A1, 15-May-96 1 (12) Preliminary Information Datasheet pdf - http://www.
DataSheet4U.
net/ www.
DataSheet.
co.
kr U4221B Pin Description Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol IN2 IN1 GND CAGC CDEM INA2 GND OUTA1 VCCD NC FSS FSI TCO PON GND VCCA Function Amplifier 1 - Input 2 Amplifier 1 - Input 1 Analog ground Time constant of AGC Low pass filter Amplifier 2 input Digital ground Amplifier 1 output Supply voltage (digital) Not connected Field strength select Field strength indication Time code output Power ON/OFF control Ground (substrate) Supply voltage (analog) IN2 1 16 VCCA IN1 2 15 GND GND 3 14 PON CAGC 4 13 TCO U 4221 B CDEM 5 12 FSI INA2 6 11 FSS GND 7 10 NC OUTA1 8 93 7507 e 9 VCCD IN1, IN2 IN2 is connected to Pin 16 (VCCA).
A ferrite antenna is connected between IN1 and IN2.
Q of antenna circuit should be as high as possible, but the temperature influence must be compensated.
The resonant resistance should be 200 kW to 300 kW for optimal sensitivity.
CDEM After demodulation the signal is low pass filtered by the capacitor CDEM.
PON If PON is connected to VCCD, the U4221B receiver IC will be activated.
The set-up time is typical 2.
5 s after applying VCCD at this pin.
If PON is connected to GND, the receiver will go...


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