TFBS5607 Datasheet, PDF (12/15 Pages) Vishay Siliconix – Integrated Low Profile Transceiver Module for Telekom Applications 9.6 kbit/s to 1.152 Mbit/s Data Transmission Rate

TFBS5607
Vishay Semiconductors
Appendix
Application Hints
Recommended Circuit Diagram
TFBS5607
The TFBS5607 doesn’t need any external
components when operated at a ”clean” power supply.
In a more 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. However, a low
impedance layout is the better and more cost efficient
solution.
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 TFBS5607 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. For adjusting the intensity
depending on the application, a serial resistor in the
Vcc2 supply to the IRED Anode pin can be used.
Shut Down
To shut down the TFBS5600 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.
Latency
The receiver is in specified conditions after the defined
latency. In a UART related application after that time
(typically 50 µs) 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.
C1, (C3): 4.7 µF, see text
C2: 470 nF
V_CC1
R1 _{C1 C2}
TFBS5607
6 Vdd1
GND
Rxd
V_CC2
Txd
SD
V_log
8 GND
C3
4 Rxd
1 Vdd2, IRED Anode
3 Txd
5 SD
7 V_logic
Figure 8. Recommended Application Circuit
Table 2. Recommended Application Circuit Components
Component
Recommended Value
C1, C3
4.7 mF, 16 V
C2
0.47 µF, Ceramic
R1
47 Ω, 0.125 W
Vishay Part Number
293D 475X9 016B 2T
VJ 1206 Y 104 J XXMT
CRCW–1206–47R0–F–RT1
www.vishay.com
12 (14)
Document Number 82553
Rev. A1.3, 17-Jul-02