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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

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