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參數(shù)資料
| 型號： | TDA5210 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ASK/FSK Single Conversion Receiver |
| 中文描述： | 詢價(jià)/ FSK信號單一轉(zhuǎn)換接收器 |
| 文件頁數(shù)： | 33/53頁 |
| 文件大小： | 1483K |
| 代理商： | TDA5210 |
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Applications
4 - 12
TDA 5210
Wireless Components
Specification, May 2001
This circuit charges the capacitor C with an inrush current I
load
of typically
220μA for a duration of T
2
until the voltage U
c
appearing on the capacitor is
equal to the voltage U
s
at the input of the data filter. This voltage is limited to
2.5V. As soon as these voltages are equal or the duration T
2
is exceeded the
precharge circuit is disabled.
τ
2
is the time constant of the charging process of C which can be calculated as
τ
2
≈
20k
·
C2
as the sum of R1 and R2 is sufficiently large and thus can be neglected. T2 can
then be calculated according to the following formula:
The voltage transient during the charging of C2 is shown in the following figure:
e-fkt1.WMF
Figure 4-11
Voltage appearing on C2 during precharging process
The voltage appearing on the capacitor C connected to pin 20 is shown in the
following figure. It can be seen that due to the fact that it is charged by a con-
stant current source it exhibits is a linear increase in voltage which is limited to
U
Smax
= 2.5V which is also the approximate operating point of the data filter
input. The time constant appearing in this case can be denoted as T3, which
can be calculated with
6
3
4
1
1
ln
2
2
2
≈
=
τ
τ
V
V
T
U2
2
3V
2.4V
T2
T3
U
C
220
μ
A
-----------------------
2.5V
220
μ
A
---------------- C
=
=
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