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參數(shù)資料
| 型號： | T4224B-CF |
| 英文描述： | Time Code Receiver |
| 中文描述： | 時間碼接收機 |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 225K |
| 代理商： | T4224B-CF |
U4224B
TELEFUNKEN Semiconductors
Rev. A3, 02-Apr-96
3 (17)
Q1A, Q1B
In order to achieve a high selectivity, a crystal is con-
nected between the pins Q1A
and Q1B. It is used with the
serial resonance frequency of the time code transmitter
(e.g. 60 kHz WWVB, 77.5 kHz DCF or 40kHz JG2AS).
The equivalent parallel capacitor of the filter crystal is
internally compensated. The compensated value is about
0.7 pF. If the full sensitivity and selectivity is not needed,
the crystal filter can be substituted by a capacitor of 10 pF
for DCF and WWVB and 22 pF for JG2AS.
Q1A
Q1B
94 8382
GND
REC
Rectifier output and integrator input: The capacitor C1
between REC and INT is the lowpass filter of the rectifier
and at the same time a damping element of the gain
control.
REC
GND
94 8374
DEC
Decoder input: Senses the current through the integration
capacitor C2. The dynamic input resistance has a value of
about 420k and is low compared to the impedance of
C2.
DEC
GND
94 8376
SL
AGC hold mode: SL high (V
SL
= V
CC
) sets normal func-
tion, SL low (V
SL
= 0) disconnects the rectifier and holds
the voltage V
INT
at the integrator output and also the AGC
amplifier gain.
V
CC
SL
94 8378
INT
Integrator output: The voltage V
INT
is the control voltage
for the AGC. The capacitor C2 between INT and DEC
defines the time constant of the integrator. The current
through the capacitor is the input signal of the decoder.
INT
GND
94 8375
FLA, FLB
Lowpass filter: A capacitor C3 connected between FLA
and FLB supresses higher frequencies at the trigger
circuit of the decoder.
FLB
FLB
94 8377
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