U4221B datasheet(6/12 Pages) TEMIC

6 / 12 page

U4221B

TELEFUNKEN Semiconductors

Rev. A1, 15-May-96

Preliminary Information

6 (12)

Electrical Characteristics

Parameters

Test Conditions / Pins

Symbol

Min.

Typ.

Max.

Unit

FIELD STRENGTH INDICATION; FSI

Pin 12

Output voltage

HIGH

LOW

RLOAD = 13 M

W to GND

RLOAD = 2.6 M

W to VCCD

VCC–0.4

0.4

Output current

HIGH

LOW

VTCO = VCCD/2

0.2

1.0

0.4

4.0

FIELD STRENGTH SELECT; FSS

Pin 11

Input voltage

HIGH

LOW

Generator output resistance

v 200 kW

VCC–0.4

0.4

Test Circuit for DCF

U 4221 B

Measurement

point

100 n 50 k

77,5 kHz

Generator

220 n

47 n

77.5 kHz

(with variable

output level)

Electronic switch

(Time Code)

1 s

Measuring device:

Oscilloscope with high impedance

w VCCD–0.8

Receiver input signal calibration:

Example: 2

m Veff input signal ⇒ 2 2 2 103 = 5.65 mVpp at measurement point

+VCC

PON

TCO

It must be noted:

Input is shortened by 50

W, that

means, the antenna noise is not taken

into consideration.

Modulation depth

adjustment by

potentiometer

(carrier reduced to 25%)

100

93 7719 e

T = 100 ms (binary “0”)

or 200 ms (binary “1”)

probe (w 20 MW)

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