TFDU8108
Document Number 82558
Rev. 1.6, 12-Aug-04
Vishay Semiconductors
www.vishay.com
1
18102
Very Fast Infrared Transceiver Module (VFIR, 16 Mbit/s), Serial
Interface Compatible, 2.7 V to 5.5 V Supply Voltage Range
Description
The TFDU8108 transceiver is part of a family of low-
power consumption infrared transceiver modules
compliant to the IrDA physical layer standard for VFIR
infrared data communication, supporting IrDA speeds
up to 16 Mbit/s (VFIR) and carrier based remote con-
trol modes up to 2 MHz. Integrated within the trans-
ceiver module are a PIN photodiode, an infrared
emitter (IRED), and a low-power BiCMOS control IC
to provide a total front-end solution in a single pack-
age.
Vishay Semiconductors VFIR transceivers are avail-
able in the BabyFace package. This provides flexibil-
ity for a variety of applications and space constraints.
The transceivers are capable of directly interfacing
with a wide variety of I/O devices, which perform the
modulation/ demodulation function. At a minimum, a
V
CC
bypass capacitor is the only external component
required implementing a complete solution. For limit-
ing the transceiver internal power dissipation one
additional resistor might be necessary. The trans-
ceiver can be operated with logic I/O voltages as low
as 1.5 V. The functionality of the device is equivalent
to the TFDU6108 with the VFIR functionality added.
The IRED current is programmable to different levels,
no external current limiting resistor is necessary.
Features
Compliant to the latest IrDA physical layer stan-
dard (Up to 16 Mbit/s) and TV Remote Control
Compliant to the IrDA "Serial Interface
Specification for Transceivers"
For 3.0 V and 5.0 V Applications, fully specified
2.7 V to 5.5 V
Compliant to all logic levels between 1.5 V and 5 V
Low Power Consumption
(typ. 2.0 mA Supply Current)
Power Shutdown Mode
(< 1
A Shutdown Current)
Surface Mount Package Options
- Universal (L 9.7 mm W 4.7 mm H 4.0 mm)
- Side and Top View
Tri-State-Receiver Output, Weak Pull-up when in
Shutdown Mode
High Efficiency Emitter
Baby Face (Universal) Package Capable of
Surface Mount Soldering to Side and Top
View Orientation
Eye safety class 1 (IEC60825-1, ed. 2001), limited
LED on-time, LED current is controlled, no single
fault to be considered
Built - In EMI Protection including GSM bands. -
EMI Immunity in GSM Bands > 300 V/m verified
No External Shielding Necessary
Few External Components Required
Pin to Pin Compatible to Legacy Vishay Semicon-
ductors SIR and FIR Infrared Transceivers
Split power supply, transmitter and receiver can be
operated from two power supplies with relaxed
requirements saving costs,
US Patent No. 6,157,476
Compliant with IrDA EMI and Background Light
Specification
TV Remote Control Support
Lead (Pb)-free device
Device in accordance to RoHS 2002/95/EC and
WEEE 2002/96/EC
www.vishay.com
2
Document Number 82558
Rev. 1.6, 12-Aug-04
TFDU8108
Vishay Semiconductors
Applications
Notebook Computers, Desktop PCs, Palmtop
Computers (Win CE, Palm PC), PDAs
Printers, Fax Machines, Photocopiers,
Screen Projectors
Telecommunication Products
(Cellular Phones, Pagers)
Internet TV Boxes, Video Conferencing Systems
External Infrared Adapters (Dongles)
Medical and Industrial Data Collection Devices
Digital Still and Video Cameras
MP3 Players
Parts Table
Functional Block Diagram
Pin Description
Part
Description
Qty / Reel
TFDU8108-TR3
Oriented in carrier tape for side view surface mounting
1000 pcs
TFDU8108-TT3
Oriented in carrier tape for top view surface mounting
1000 pcs
Comparator
Amplifier
AGC
Logic
Driver
Current controlled
driver
V
CC1
SCLK
Txd
GND
Rxd
IRED Anode
IRED Cathode
200
V
logic
V
CC2
17086
Pin Number
Function
Description
I/O
Active
1
IRED Anode
Connect IRED anode directly to V
CC2
. An unregulated separate
power supply separated can be used at this pin.
2
IRED Cathode
IRED cathode, internally connected to driver transistor
3
Txd
Transmit Data Input, dynamically loaded
I
HIGH
4
Rxd
Received Data Output, push-pull CMOS driver output capable of
driving a standard CMOS or TTL load. No external pull-up or pull-
down resistor is required. Pin is current limited for protection against
programming errors. The output is loaded with a weak 500 k
pull-
up when in SD mode
O
LOW
5
SCLK
Serial Clock, dynamically loaded
I
HIGH
TFDU8108
Document Number 82558
Rev. 1.6, 12-Aug-04
Vishay Semiconductors
www.vishay.com
3
Pinout
TFDU8108
weight 200 mg
Definitions:
In the Vishay transceiver data sheets the following nomenclature is
used for defining the IrDA operating modes:
SIR: 2.4 kbit/s to 115.2 kbit/s, equivalent to the basic serial infrared
standard with the physical layer version IrPhy 1.0
MIR 576 kbit/s to 1152 kbit/s
FIR 4 Mbit/s
VFIR 16 Mbit/s
MIR and FIR were implemented with IrPhy 1.1, followed by IrPhy
1.2, adding the SIR Low Power Standard. IrPhy 1.3 extended the
Low Power Option to MIR and FIR and VFIR was added with IrPhy
1.4. A new version of the standard in any case obsoletes the former
version.
Remark:
Throughout the documentation the not correct term LED (Light
Emitting Diode) is used for Infrared Emitting Diode (IRED). We are
following the trend to use the term light for infrared radiation, which
is wrong but common usage.
6
V
CC
Supply Voltage
7
V
logic
Supply voltage for digital part, 1.5 V to 5.5 V, defines logic swing for
Txd, SCLK, and Rxd
8
GND
Ground
Pin Number
Function
Description
I/O
Active
"U" Option BabyFace
(Universal)
IRED
Detector
1
2 3 4 5 6
7 8
17087
www.vishay.com
4
Document Number 82558
Rev. 1.6, 12-Aug-04
TFDU8108
Vishay Semiconductors
Absolute Maximum Ratings
Reference point Ground (pin 8) unless otherwise noted.
Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
Due to the internal measures the device is a "class1" device. It will not exceed the IrDA intensity limit of 500 mW/sr.
*)
With the amendment 2 of IEC 60825 - 1 this value
Parameter
Test Conditions
Symbol
Min
Typ.
Max
Unit
Supply voltage range,
transceiver
0 V < V
CC2
< 6 V
V
CC1
- 0.5
+ 6
V
Supply voltage range,
transmitter
0 V < V
CC1
< 6 V
V
CC2
- 0.5
+ 6
V
Supply voltage range,
transceiver logic
0 V < V
CC1
< 6 V
V
logic
- 0.5
+ 6
V
Input currents
for all pins, except IRED anode
pin
10
mA
Output sinking current
25
mA
Junction temperature
T
J
125
C
Power dissipation
see derating curve, figure 4
P
D
350
mW
Ambient temperature range
(operating)
T
amb
- 25
+ 85
C
Storage temperature range
T
stg
- 40
+ 100
C
Soldering temperature
see recommended solder profile
(see figure 3)
240
C
Average output current
I
IRED
(DC)
130
mA
Repetitive pulse output current
< 90
s, t
on
< 20 %
I
IRED
(RP)
600
mA
IRED anode voltage
V
IREDA
- 0.5
+ 6
V
Transmitter data input voltage
V
Txd
- 0.5
V
logic
+ 0.5
V
Receiver data output voltage
V
Rxd
- 0.5
V
logic
+ 0.5
V
Virtual source size
Method: (1 - 1/e) encircled
energy
d
2.5
2.8
mm
Maximum Intensity for Class 1
Operation of IEC825-1 or
EN60825-1, edition Jan. 2001*)
unidirectional operation, worst
case IrDA FIR pulse pattern
Internally
limited to
class 1
IrDA specified maximum limit
500
mW/sr
TFDU8108
Document Number 82558
Rev. 1.6, 12-Aug-04
Vishay Semiconductors
www.vishay.com
5
Electrical Characteristics
Transceiver
T
amb
= 25 C, V
CC
= 2.7 V to 5.5 V unless otherwise noted.
Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
1)
Receive mode only. In transmit mode, add the averaged programmed current of IRED current as I
CC2
2)
Standard Illuminant A
3)
The typical threshold level is between 0.5 x V
logic
/2 (V
logic
= 3 V) and 0.4 x V
logic
(V
logic
= 5.5 V).With that the device will work with less
tight levels than the specified min/ max values. However, it is recommended to use the specified min/max values to avoid increased oper-
ating/standby supply currents.
Parameter
Test Conditions
Symbol
Min
Typ.
Max
Unit
Supply voltage
V
CC1
2.7
5.5
V
V
logic
1.5
5.5
V
Dynamic supply current
1)
T = - 25 C to 85 C
active, no signal E
e
= 0 klx
I
CC1
3.0
10
mA
T = - 25 C to 85 C
active, no signal E
e
= 0 klx, SIR
only
I
CC1
1.6
2.5
mA
T = - 25 C to 85 C idle
active, no load E
e
= 0 klx
I
logic
5
A
T = - 25 C to 85 C
E
e
= 1 klx
2)
receive mode,
E
Eo
= 100 mW/m
2
(9.6 kbit/s to 4.0 Mbit/s),
R
L
= 10 k
to V
logic
= 5 V,
C
L
= 15 pF
I
logic
1
mA
Shutdown supply current
inactive, set to shutdown mode
T = 25 C, E
e
= 0 klx
I
SD
1
A
inactive, set to shutdown mode
T = 25 C, E
e
= 1 klx
2)
I
SD
1.5
A
shutdown mode, T = 85 C,
not ambient light sensitive
I
SD
5
A
Operating temperature range
T
A
- 25
+ 85
C
Output voltage low
C
load
= 15 pF, V
logic
= 5 V
V
OL
0.5
0.8
V
Output voltage high
C
load
= 15 pF, V
logic
= 5 V
V
OH
V
logic
- 0.5
V
Input voltage low (Txd, SCLK)
CMOS level
3)
V
IL
0.15 x V
logic
V
Input voltage high (Txd, SCLK)
CMOS level
3)
V
IH
0.9 x V
logic
V
Input leakage current (Txd,
SCLK)
I
L
- 10
+ 10
A
Input capacitance
C
IN
5
pF
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