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參數(shù)資料
| 型號： | T4225B-MC |
| 廠商： | ATMEL CORP |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, UUC17 |
| 封裝： | DIE-17 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 195K |
| 代理商： | T4225B-MC |
T4225B
Rev. A3, 03-Dec-98
3 (16)
IN
A ferrite antenna is connected between IN and VCC. For
high sensitivity, the Q factor of the antenna circuit should
be as high as possible. Please note that a high Q factor
requires temperature compensation of the resonant
frequency in most cases. We recommend a Q factor
between 50 and 100. Specifications are valid for Q > 30.
An optimal signal-to-noise ratio will be achieved by a
resonant resistance of 50 to 200 k
W.
IN
VCC
94 8379
Figure 3.
SB
A resistor RSB is connected between SB and GND. It con-
trols the bandwidth of the crystal filters. It is recom-
mended: RSB = 0
W for DCF 77.5 kHz, RSB = 10 kW for
60 kHz WWVB and RSB = open for JG2AS 40 kHz.
SB
GND
94 8381
Figure 4.
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 resonant frequency of the time-code transmitter
(e.g., 60 kHz WWVB, 77.5 kHz DCF or 40 kHz JG2AS).
The equivalent parallel capacitor of the filter crystal is
internally compensated. The compensated value is about
0.7 pF. If full sensitivity and selectivity are 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
Figure 5.
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
Figure 6.
DEC
Decoder input: Senses the current through the integration
capacitor C2. The dynamic input resistance has a value of
about 420 k
W and is low compared to the impedance of
C2.
DEC
GND
94 8376
Figure 7.
SL
AGC hold mode: SL high (VSL = VCC) sets normal
function, SL low (VSL = 0) disconnects the rectifier and
holds the voltage VINT at the integrator output and also
the AGC amplifier gain.
VCC
SL
94 8378
Figure 8.
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