TFDH6541 Vishay, TFDH6541 Datasheet - Page 7

• Manufacturer Part Number: TFDH6541
• Manufacturer: Vishay
• Type: TX/RXr

Specifications of TFDH6541

• Data Rate: 0.004kbps
• Peak Wavelength: 900nm
• Angle Of Half Sensitivity: 48°
• Pulse Width: 10us
• Led Supply Voltage: -0.5 to 6V
• Package Type: SIP
• Fall Time: 40ns
• Rise Time: 40ns
• Dimensions: 13x5.95x4.3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (min): 2.6V
• Operating Supply Voltage (max): 5.5V
• Mounting: Through Hole
• Pin Count: 10
• Operating Temp Range: -25C to 85C
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Supplier Unconfirmed

Recommended Circuit Diagram
The only required component for designing an
IrDA 1.3
transceivers is a current limiting resistor, R1, to the
IRED. However, depending on the entire system
design and board layout, additional components may
be required (see figure KEIN MERKER).
Table 1. Recommended Application Circuit Components
Document Number 82527
Rev. A1.1, 29-Jan-01
SD/Mode
Component
V
V
GND
Rxd
Txd
CC2
CC1
C1
C2
R1
R2
Figure 3. Recommended Application Circuit
solution
Note: outlined components are optional depending
C1
4.7 F, Tantalum
0.1 F, Ceramic
5 V supply voltage: 7.2
(recommend using
two 3.6 , 0.125 W resistors in series)
3.3 V supply voltage: 3.6
(recommend using
two 1.8 , 0.125 W resistors in series)
47
R2
R1
on the quality of the power supply
C2
, 0.125 W
using
IRED
Cathode
Rxd
Vcc
GND
Recommended Value
Vishay
SD/Mode
, 0.25 W
Anode
, 0.25 W
Mode
Telefunken
IRED
Txd
Vishay Telefunken transceivers integrate a sensitive
receiver and a built-in power driver. The combination
of both needs a careful circuit board layout. The use of
thin, long, resistive and inductive wiring should be
avoided. The inputs (Txd, SD/ Mode) and the output
Rxd should be directly (DC) coupled to the I/O circuit.
R1 is used for controlling the current through the
IR emitter. For increasing the output power of the
IRED, the value of the resistor should be reduced.
Similarly, to reduce the output power of the IRED, the
value of the resistor should be increased. For typical
values of R1 see figure KEIN MERKER. For IrDA
compliant operation, a current control resistor of 7.2
is recommended. For compensating losses of the
cosmetic window, reducing that value to 5.6
acceptable. The upper drive current limitation is
dependent on the duty cycle and is given by the
absolute maximum ratings on the data sheet.
R2, C1 and C2 are optional and dependent on the
quality of the supply voltage V
An unstable power supply with dropping voltage during
transmission may reduce sensitivity (and transmission
range) of the transceiver.
The placement of these parts is critical. It is strongly
recommended to position C2 as near as possible to the
transceiver power supply pins. An electrolytic
capacitor should be used for C1 while a ceramic
capacitor is used for C2.
293D 475X9 016B 2T
VJ 1206 Y 104 J XXMT
CRCW–1206–3R60–F–RT1
CRCW–1206–1R80–F–RT1
CRCW–1206–47R0–F–RT1
TFDH6131/TFDH6541
Vishay Part Number
Vishay Semiconductors
CC
and injected noise.
www.vishay.com
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