TFDU4301-TT3 Vishay, TFDU4301-TT3 Datasheet - Page 5

• Manufacturer Part Number: TFDU4301-TT3
• Manufacturer: Vishay

Specifications of TFDU4301-TT3

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Note
(1)
(2)
(3)
(4)
(5)
(6)
RECOMMENDED CIRCUIT DIAGRAM
Operated with a clean low impedance power supply the
TFDU4301 needs no additional external components.
However, depending on the entire system design and board
layout, additional components may be required (see figure 1).
Note
*)
The capacitor C1 is buffering the supply voltage and
eliminates the inductance of the power supply line. This one
should be a tantalum or other fast capacitor to guarantee the
fast rise time of the IRED current. The resistor R1 is the
current limiting resistor, which may be used to reduce the
operating current to levels below the specified controlled
values for saving battery power.
Vishay’s 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 shutdown input
must be grounded for normal operation, also when the
shutdown function is not used.
Document Number: 81965
Rev. 1.0, 22-Apr-10
R1 is optional when reduced intensity is used
OPTOELECTRONIC CHARACTERISTICS
PARAMETER
TRANSMITTER
Optical rise time, fall time
Optical output pulse duration
Optical overshoot
Tested at T
Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
Equivalent to IrDA background light and electromagnetic field test: fluorescent lighting immunity.
IrDA sensitivity definition: minimum irradiance E
the source is operating at the minimum intensity in angular range into the minimum half-angular range at the maximum link length.
Maximum irradiance E
intensity in angular range at minimum link length must not cause receiver overdrive distortion and possible ralated link errors. If placed at the
active output interface reference plane of the transmitter, the receiver must meet its bit error ratio (BER). For more definitions see the
document “Symbols and Terminology” on the Vishay website.
Using an external current limiting resistor is allowed and recommended to reduce IRED intensity and operating current when current reduction
is intended to operate at the IrDA low power conditions. E.g. for V
minimized operation at IrDA low power conditions.
Due to this wavelength restriction compared to the IrDA spec of 850 nm to 900 nm the transmitter is able to operate as source for the standard
remote control applications with codes as e.g. Phillips RC5/RC6
19295-1
V
V
GND
SD
TXD
RXD
IRED
CC
Fig. 1 - Recommended Application Circuit
amb
= 25 °C, V
C1
R1*)
R2
e
in angular range, power per unit area. The optical delivered to the detector by a source operating at the maximum
Infrared Transceiver Module (SIR, 115.2 kbit/s)
[e-mail], [e-mail],
CC1
C2
For technical questions within your region, please contact one of the following:
= V
CC2
Input pulse width 1.6 < t
= 2.4 V to 5.5 V unless otherwise noted.
V
V
Ground
SD
TXD
RXD
IRED C
Input pulse width t
CC2
CC1
, IRED A
TEST CONDITIONS
for IrDA
e
in angular range, power per unit area. The receiver must meet the BER specification while
®
TXD
Applications
(1)
TXD
≥ 23 µs
®
< 23 µs
or RECS 80.
CC2
= 3.3 V a current limiting resistor of R
The inputs (TXD, SD) and the output RXD should be directly
connected (DC - coupled) to the I/O circuit. The capacitor C2
combined with the resistor R2 is the low pass filter for
smoothing the supply voltage. R2, C1 and C2 are optional
and dependent on the quality of the supply voltages V
and injected noise. An unstable power supply with dropping
voltage during transmision may reduce the sensitivity (and
transmission range) of the transceiver.
The placement of these parts is critical. It is strongly
recommended to position C2 as close as possible to the
transceiver pins.
When extended wiring is used as in bench tests the
inductance of the power supply can cause dynamically a
voltage drop at V
able to follow the fast current rise time. In that case another
4.7 µF (type, see table under C1) at V
Under
RF-transmitter antenna on top of the transceiver, we
recommend to protect all inputs by a low-pass filter, as a
minimum a 12 pF capacitor, especially at the RXD port. The
transceiver itself withstands EMI at GSM frequencies above
500 V/m. When interference is observed, the wiring to the
inputs picks it up. It is verified by DPI measurements that as
long as the interfering RF - voltage is below the logic
COMPONENT
TABLE 1 - RECOMMENDED APPLICATION
CIRCUIT COMPONENTS
SYMBOL
t
ropt
C1
C2
R1
R2
t
t
opt
opt
, t
extreme
[e-mail]
fopt
t
Depends on current
TXD
RECOMMENDED
0.1 µF, ceramic
CC2
MIN.
47 Ω, 0.125 W
to be adjusted
23
4.7 µF, 16 V
10
- 0.15
EMI
. Often some power supplies are not
VALUE
Vishay Semiconductors
conditions
TYP.
50
50
S
CRCW-1206-47R0-F-RT1
VISHAY PART NUMBER
= 56 Ω will allow a power
VJ 1206 Y 104 J XXMT
CC2
t
TXD
293D 475X9 016B
TFDU4301
MAX.
300
100
as
25
will be helpful.
+ 0.15
www.vishay.com
placing
UNIT
ns
µs
µs
%
CC
an
1
5