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參數(shù)資料
| 型號： | TFDU4204 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | Integrated Low Profile Transceiver Module for Telecom Applications - IrDA Standard |
| 中文描述： | 集成的收發(fā)器模塊超薄電信應(yīng)用-紅外標(biāo)準(zhǔn) |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 147K |
| 代理商： | TFDU4204 |
TFDU4203
Vishay Semiconductors
Rev. A1.1, 13-Feb-03
10 (12)
www.vishay.com
Document Number 82542
Appendix
Application Hints
The TFDU4203 does not need any external
components when operated at a “clean“ power supply.
In a more noisy ambient it is recommended to add a
capacitor C1 (4.7 F Tantalum) and a resistor
R1 (
≤
3
)
for noise suppression. In addition the
capacitor is needed to prevent a pulse distortion when
the power supply is not able to generate the peak
currents or inductive wiring is used. A combination of
a tantalum with a ceramics capacitor will be efficient to
attenuate both, RF and LF if RF noise is present. The
value is dependent on the power supply quality. A good
choice is between 4.7 F and 10 F.
Recommended Circuit Diagram
TFDU4203
R1
Vcc
Rxd
C1
GND
SD
Txd
5, 6
8
3
7
4
GND
SD
Rxd
Txd
V
CC
R2
1, 2 IRED Cathode
Shut down
To shut down the TFDU4103 into a standby mode the
SD pin has to be set active.
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.
For more application circuits, see IrDC Design Guide
and TOIM3...–series data.
Table 1. Recommended Application Circuit Components *)
Component
C1
4.7 F, 16 V
R1
5
max
*)
This is a recommendation for a combination to start with to exclude power supply effects.
Optimum, from a costs point of view, to work without both.
Recommended Value
Vishay Part Number
293D 475X9 016B 2T
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