U4221B Datasheet, PDF (6/12 Pages) TEMIC Semiconductors – Radio Controlled Clock Receiver

U4221B
Electrical Characteristics
Parameters
Test Conditions / Pins Symbol Min.
Typ.
Max.
Unit
FIELD STRENGTH INDICATION; FSI Pin 12
Output voltage
HIGH
LOW
Output current
HIGH
LOW
R_LOAD = 13 MW to GND
R_LOAD = 2.6 MW to V_CCD
V_TCO = V_CCD/2
V_TCO = V_CCD/2
V_CC–0.4
0.2
1.0
V
0.4
0.4
mA
4.0
mA
FIELD STRENGTH SELECT; FSS
Pin 11
Input voltage
HIGH
LOW
vGenerator output resistance
200 kW
V_CC–0.4
V
0.4
V
Test Circuit for DCF
Measurement
point
1
16
50
77,5 kHz
2
15
Generator
100 n 50 k
50
3
14
(with variable
output level)
100 W
Modulation depth
adjustment by
potentiometer
(carrier reduced to 25%)
220 n
4
13
U 4221 B
5
12
47 n
6
11
Electronic switch
7
10
(Time Code)
77.5 kHz
8
9
T
T = 100 ms (binary “0”)
1s
or 200 ms (binary “1”)
+V_CC
It must be noted:
Input is shortened by 50 W, that
means, the antenna noise is not taken
into consideration.
PON
TCO
Measuring device:
w V_CCD–0.8
V
w ^{Oscilloscope with high impedance}
probe ^{( 20 MW)}
Receiver input signal calibration:
Example: 2 m V_eff input signal ⇒ 2
2
2
10³ = 5.65 mV_pp at measurement point
93 7719 e
6 (12)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 15-May-96