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參數(shù)資料
| 型號(hào)： | TFDU5107-TT3 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | Integrated Low Profile Transceiver Module for Telecom Applications |
| 中文描述： | 超薄集成收發(fā)模塊的電信應(yīng)用 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 233K |
| 代理商： | TFDU5107-TT3 |
TFDU5107
Vishay Semiconductors
Rev. A1.4, 01-Nov-02
10 (13)
www.vishay.com
Document Number 82534
Appendix
Application Hints
The TFDU5107 do not need any external components
when operated at a ”clean” power supply. In a more
power supply noisy ambient it is recommended to add
a combination of a resistor and capacitor (R1, C1, C2)
for noise suppression as shown in the figure below. A
combination of a electrolytic for the low frequency
range and a ceramic capacitor for suppressing the
high frequency disturbance will be most effective. The
capacitor C3 is only necessary when inductive wiring
is used or the power supply cannot deliver the
operating peak pulse current.
The inputs TXD and SD are high impedance CMOS
inputs. Therefore, the lines from the I/O to those inputs
should be carefully designed not to pick up ambient
noise. If long lines are used, loads at the Txd input of
the TFDx5x07 and at the Rxd input of the controller (!)
are recommended. At the IRED Anode voltage supply
line an additional capacitor might be necessary when
inductive wiring is used. However, a low impedance
layout is the better and more cost efficient solution. For
adjusting the intensity depending on the application,
see the diagrams.
Recommended Circuit Diagram
TFDU5107
C3
R1
SD
V
log
Rxd
C1, (C3): 4.7
μ
F, see text
C2: 470 nF
C1
GND
V
CC1
V
CC2
Txd
8
6
4
1
3
5
7
GND
Vdd1
Rxd
Vdd2, IRED Anode
Txd
SD
V
logic
C2
R2
Figure 7. Recommended Application Circuit
Shut Down
To shut down the TFDx5x07 into a standby mode the
SD pin has to be set active. After a delay of < 1 ms it
will switch to the standby mode.
0
100
200
300
400
500
0
2
4
6
8
10
12
14
16
Current Control Resistor ( )
15186
I
min. intensity in emission cone
15
°
max.R
dson
, max.V
F
V
cc
=4.75V
min. R
dson
, min. V
F
5.0V
emission cone
15
°
max. intensity in
5.25V
5.0V
Figure 8. Intensity I
e
vs. Current Control Resistor R2
5 V Applications
3.6V
0
100
200
300
400
500
600
700
0
2
4
6
8
10
12
Current Control Resistor ( )
15187
I
emission cone
15
°
V
cc
=3.0V
min. R
dson
, min. V
F
3.3V
max. intensity in
emission cone
15
°
max. R
dson
, max. V
F
min. intensity in
Figure 9. Intensity I
e
vs. Current Control Resistor R1,
3 V Applications
Latency
The receiver is in specified conditions after the defined
latency. In a UART related application after that time
(typically 50
μ
s) the receiver buffer of the UART must
be cleared. Therefore, the transceiver has to wait at
least the specified latency after receiving the last bit
before starting the transmission to be sure that the
corresponding receiver is in a defined state.
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