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U4221B の電気的特性と機能

U4221BのメーカーはTEMIC Semiconductorsです、この部品の機能は「Radio Controlled Clock Receiver」です。


製品の詳細 ( Datasheet PDF )

部品番号 U4221B
部品説明 Radio Controlled Clock Receiver
メーカ TEMIC Semiconductors
ロゴ TEMIC Semiconductors ロゴ 




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U4221B Datasheet, U4221B PDF,ピン配置, 機能
www.DataSheet.co.kr
Radio Controlled Clock Receiver
U4221B
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
VCCA
16
GND
15
Power supply
IN2
1
Amplifier 1
IN1
2
FSI
12
Driver
NC VCCD
10 9
Comparator
FSS
11
AGC
Amplifier 2
Demodulator
CAGC
4
3
GND (analog)
86
OUTA1 INA2
Figure 1.
75
GND (digital) CDEM
93 7506 e
TELEFUNKEN Semiconductors
Rev. A1, 15-May-96
Preliminary Information
1 (12)
Datasheet pdf - http://www.DataSheet4U.net/

1 Page





U4221B pdf, ピン配列
www.DataSheet.co.kr
U4221B
TCO
The digitized serial signal of the time code transmitter can
be directly decoded by a microcomputer. Details about
the time code format of several transmitters are described
separately.
The output consists of a PNP current source and a NPN
switching transistor TS. The guaranteed source output
current is 0.2 µA (TCO = high) and the sink current is
1 µA (TCO = low). Considering these output currents, the
supply voltage and the switching levels of the following
µC, the lowest load resistance is defined. The maximum
load capacitance is 100 pF.
In order to improve the driving capability an external
pull-up resistor can be used. The value of the resistor
should be 4.7 MW. To prevent an undefined output vol-
tage in the power-down state of the U4221B, the use of
this pull-up resistor is recommended.
An additional improvement of the driving capability may
be achieved by using a CMOS driver circuit or a NPN
transistor with pull-up resistor connected to the collector
(see figure 2). Using a CMOS driver this circuit must be
connected to VCCD.
pin 9
VCCD
ISOURCE
0.2 m A
4.7 MW 100 kW
TCO
TS
ISINK
1 mA
pin13
TCO
93 7689 e
Figure 2.
Functional Description
The following description gives you some additional
information and hints in order to facilitate your design, in
particular the problems of the antenna.
Figure 3 shows the principal function of the receiver
(simplified consideration).
Rres
CF
A1
A 2 and
Demodulator
93 7521 e
Comparator
Figure 3.
Rres: resonant resistance, A1: preamplifier,
A2: amplifier 2, CF: crystal filter
Condition for signal reception:
S/N 4 at comparator input.
Important parameters are:
VNA = (4 k T Rres)1/2
BWA = fres/QA
input noise voltage density of preamplifier:
VNA1: 40 nV/Hz1/2 (typ)
bandwidth of preamplifier:
BWA1: 60 kHz (typ)
bandwidth of crystal filter:
BWCF: 16 Hz (typ)
ultimate attenuation of crystal filter:
DCF: –35 dB (typ)
whereas:
@VNA antenna noise voltage density
k 1.38 10–23 Ws/K (Boltzmann constant)
T absolute temperature
BWA bandwidth of antenna
fres resonant frequency
QA Q antenna
The equivalent input noise voltage at the preamplifier in-
Ǹ ǒ Ǔ ǒ Ǔput is:
+VN
@ Ǹ ) @ Ǹ ) @@VNA
2
BW CF
2
VNA BWA
DCF
ǒ Ǔ ǒ Ǔ@@@ ) @ Ǹ ) @ ǸVNA1
2
BWCF
VNA1 BWA1
DCF
2
whereas:
Rres = 300 kW, BWA = 1 kHz then VN 0.4 m V
The condition for signal reception is:
S/N 4 sensitivity 1.6 m V
That means that the noise voltage of antenna within the
bandwidth of the crystal filter dominates and the
bandwidth of antenna is uncritical for the sensitivity
aspect.
TELEFUNKEN Semiconductors
Rev. A1, 15-May-96
Preliminary Information
3 (12)
Datasheet pdf - http://www.DataSheet4U.net/


3Pages


U4221B 電子部品, 半導体
www.DataSheet.co.kr
U4221B
Electrical Characteristics
Parameters
Test Conditions / Pins
FIELD STRENGTH INDICATION; FSI Pin 12
Output voltage
HIGH
LOW
Output current
HIGH
LOW
RLOAD = 13 MW to GND
RLOAD = 2.6 MW to VCCD
VTCO = VCCD/2
VTCO = VCCD/2
FIELD STRENGTH SELECT; FSS
Pin 11
Input voltage
HIGH
LOW
Generator output resistance
v 200 kW
Symbol Min.
VCC–0.4
0.2
1.0
VCC–0.4
Typ.
Max.
0.4
0.4
4.0
0.4
Unit
V
mA
mA
V
V
Test Circuit for DCF
Measurement
point
77,5 kHz
Generator
50
(with variable
output level)
50
100 n 50 k
100 W
220 n
Modulation depth
adjustment by
potentiometer
(carrier reduced to 25%)
47 n
Electronic switch
(Time Code)
77.5 kHz
1
2
3
4
U 4221 B
5
6
7
8
16
15
14
13
12
11
10
9
T T = 100 ms (binary “0”)
1 s or 200 ms (binary “1”)
+VCC
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 VCCD–0.8
V
wOscilloscope with high impedance
probe ( 20 MW )
Receiver input signal calibration:
Example: 2 m Veff input signal 2  2  2  103 = 5.65 mVpp at measurement point
93 7719 e
6 (12)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 15-May-96
Datasheet pdf - http://www.DataSheet4U.net/

6 Page



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部品番号部品説明メーカ
U4221B

Radio Controlled Clock Receiver

TEMIC Semiconductors
TEMIC Semiconductors


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