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PDF U4224B-CFL Data sheet ( Hoja de datos )
| Número de pieza | U4224B-CFL | |
| Descripción | Time Code Receiver | |
| Fabricantes | TEMIC Semiconductors | |
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Time Code Receiver
U4224B
Description
The U4224B is a bipolar integrated straight through receiver circuit in the frequency range of 40 to 80 kHz.
The device is designed for radio controlled clock applications.
Features
D Very low power consumption
D Very high sensitivity
D High selectivity by using two crystal filters
D Power down mode available
D Only a few external components necessary
D Digitalized serial output signal
D AGC hold mode
Block Diagram
GND 3
VCC 1
PON
15
Power Supply
TCO
16
93 7727 e
Decoder
11 FLB
10 FLA
9 DEC
IN 2
AGC
Amplifier
4 5 6 13
SB Q1A Q1B Q2A
14
Q2B
Rectifier & 12 SL
Integrator
7
REC
8
INT
TELEFUNKEN Semiconductors
Rev. A3, 02-Apr-96
1 (17)
1 page  
U4224B
Afterwards, the two frequencies where the voltage of the
rf signal at the probe drops 3 dB down can be measured.
The difference between these two frequencies is called
the bandwidth BWA of the antenna circuit. As the value
of the capacitor Cres in the antenna circuit is well known,
it is easy to compute the resonance resistance according
to the following formula:
+ @ @ @pRres 2
1
BWA Cres
whereas
Rres is the resonance resistance,
BWA is the measured bandwidth (in Hz)
Cres is the value of the capacitor in the antenna circuit
(in Farad)
If high inductance values and low capacitor values are
used, the additional parasitic capacitances of the coil
must be considered. It may reach up to about 20 pF. The
Q-value of the capacitor should be no problem if a high
Q-type is used. The Q-value of the coil is more or less
distinguished by the simple DC-resistance of the wire.
Skin effects can be observed but do not dominate.
Therefore it shouldn’t be a problem to achieve the recom-
mended values of resonance resistance. The use of thicker
wire increases Q and accordingly reduces bandwidth.
This is advantageous in order to improve reception in
noisy areas. On the other hand, temperature compen-
sation of the resonance frequency might become a
problem if the bandwidth of the antenna circuit is low
compared to the temperature variation of the resonance
frequency. Of course, Q can also be reduced by a parallel
resistor.
Temperature compensation of the resonance frequency is
a must if the clock is used at different temperatures.
Please ask your dealer of bar antenna material and of ca-
pacitors for specified values of temperature coefficient.
Furthermore some critical parasitics have to be consid-
ered. These are shortened loops (e.g. in the ground line of
the PCB board) close to the antenna and undesired loops
in the antenna circuit. Shortened loops decrease Q of the
circuit. They have the same effect like conducting plates
close to the antenna. To avoid undesired loops in the
antenna circuit it is recommended to mount the capacitor
Cres as close as possible to the antenna coil or to use a
twisted wire for the antenna coil connection. This twisted
line is also necessary to reduce feedback of noise from the
microprocessor to the IC input. Long connection lines
must be shielded.
A final adjustment of the time code receiver can be done
by pushing the coil along the bar antenna. The maximum
of the integrator output voltage VINT at pin INT indicates
w Wthe resonant point. But attention: The load current should
not exceed 1 nA, that means an input resistance 1 G
of the measuring device is required. Therefore a special
DVM or an isolation amplifier is necessary.
Absolute Maximum Ratings
Parameters
Supply voltage
Ambient temperature range
Storage temperature range
Junction temperature
Electrostatic handling
( MIL Standard 883 D ), excepted pins 5, 6, 13 and 14
Thermal Resistance
Thermal resistance
Parameters
Symbol
VCC
Tamb
Rstg
Tj
± VESD
Symbol
RthJA
Value
5.25
–25 to +75
–40 to +85
125
2000
Value
70
Unit
V
_C
_C
_C
V
Unit
K/W
TELEFUNKEN Semiconductors
Rev. A3, 02-Apr-96
5 (17)
5 Page 
PAD Coordinates
The T4224B is the die version of the U4224B.
DIE size: 2.26 x 2.09 mm
"PAD size: 100 x 100 mm (contact window 88 x 88 mm)
Thickness: 300 mm 20 mm
Symbol
x-axis/mm
y-axis/mm
IN1 128 758
IN 128 310
GND
354
124
SB 698 128
Q1A 1040
128
Q1B 1290 128
REC 1528
128
INT 1766 128
DEC
2044
268
The PAD coordinates are referred to the left bottom point
of the contact window.
Symbol
FLA
FLB
SL
Q2A
Q2B
PON
TCO
VCC
PAD Layout
U4224B
x-axis/mm
2044
2044
2044
1980
1634
1322
1008
128
y-axis/mm
676
1012
1624
1876
1876
1876
1876
1098
TCO
PON
Q2B Q2A
SL
VCC
T4224B
FLB
IN1
FLA
y-axis
IN
GND
SB
Q1A Q1B REC INT DEC
x-axis
Reference point (0/0)
94 8892
TELEFUNKEN Semiconductors
Rev. A3, 02-Apr-96
11 (17)
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet U4224B-CFL.PDF ] | |
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