U4221B TEMIC Semiconductors, U4221B Datasheet - Page 2

• Manufacturer Part Number: U4221B
• Description: Radio Controlled Clock Receiver
• Manufacturer: TEMIC Semiconductors

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Pin Description
IN1, IN2
IN2 is connected to Pin 16 (V
connected between IN1 and IN2. Q of antenna circuit
should be as high as possible, but the temperature
influence must be compensated. The resonant resistance
should be 200 k
OUTA1, INA2
To achieve a high selectivity, a quartz resonator is
connected between the pins OUTA1 and INA2. It is used
with the serial resonance frequency of the time code
transmitter (e.g. 60 kHz WWVB, 77.5 kHz DCF). The
parasitic parallel capacitance C
should be 0.5 pF to 1 pF.
CAGC
A control voltage derived from the field strength is
generated to control the amplifiers. The time constant of
this automatic gain control (AGC) is influenced by the
capacitor CAGC.
U4221B
2 (12)
Pin
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
OUTA1
Symbol
CDEM
CAGC
V
V
INA2
GND
GND
GND
TCO
PON
IN2
IN1
FSS
FSI
NC
CCD
CCA
W
to 300 k
Amplifier 1 - Input 2
Amplifier 1 - Input 1
Analog ground
Time constant of AGC
Low pass filter
Amplifier 2 input
Digital ground
Amplifier 1 output
Supply voltage (digital)
Not connected
Field strength select
Field strength indication
Time code output
Power ON/OFF control
Ground (substrate)
Supply voltage (analog)
W
for optimal sensitivity.
CCA
0
of the quartz resonator
Function
). A ferrite antenna is
Preliminary Information
CDEM
After demodulation the signal is low pass filtered by the
capacitor CDEM.
PON
If PON is connected to V
will be activated. The set-up time is typical 2.5 s after ap-
plying V
receiver will go into stop mode.
FSS
This pin is connected to GND, otherwise the field strength
indication FSI is disabled.
FSI
If the voltage at the input of amplifier 1 is higher than
about 5
OUTA1
CDEM
CAGC
GND
INA2
GND
m
IN2
IN1
CCD
V, FSI will be high.
at this pin. If PON is connected to GND, the
2
3
7
1
5
6
8
4
U 4221 B
TELEFUNKEN Semiconductors
CCD,
the U4221B receiver IC
93 7507 e
Rev. A1, 15-May-96
15
12
10
16
14
13
11
9
GND
TCO
V
PON
FSI
FSS
NC
V
CCA
CCD
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