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TFDT4000
Edition January 7, 1996
Integrated Transceiver
Description The TFDT4000 is an infrared transceiver for data communication systems. The
transceiver is compatible to the IRDA standard and allows data rates up to 115 kbit/sAn internal AGC (Automatic Gain Control) ensures proper operation under EMI conditions. The internal IRED driver can be connected by the external current control resistor to an independent unregulated power supply. This will add more freedom in circuit design and efficient serial drive capability for external IREDs for high power applications.
Features:
Compatible to IRDA standard SMD top view and through hole side view Wide supply voltage range (2.7V...5.5V) Low Profile (height = 5.6 mm max.) Microcomputer compatible Fewest external components Low power consumption AGC for EMI immunity Open collector IRED driver
Package: Pins, see pg. 7: 1: IRED Anode 2: IRED Cathode 3: Txd (Input) 4: Rxd (Output) 5: NC 6: VCC (Supply Voltage) 7: SC (Sensitivity Control) 8: Ground 2 stand off pins internally connected to ground.
Block Diagram
Vcc
6
Driver Amplifier Comparator Rxd 4 1
7 SC
AGC logic
3 Txd Open Collector Driver 8 GND
1
2
TFDT4000
Edition January 7, 1996
Absolute maximum ratings
Reference Point Pin 8, unless otherwise noted. Parameter Supply Voltage Range Voltage Range of IRED pin 1, Drive Output Txd "LOW" Input Currents all pins except 1, 8, see IRED current Test Conditions Symbol Vcc MIN - 0.5 - 0.5 TYP MAX 6 6 10 Unit V V mA Remark
Output Sinking Current Power Dissipation Junction Temperature Ambient Temperature Range (Operating) Storage temperature range Soldering temperature Average IRED current Rep. pulsed IRED current Peak IRED current IRED Anode Voltage Transmitter Data Input Voltage Receiver Data Output Voltage t= 20 s @215C IIRED(DC) IIRED(RP) IIRED(PK) VIREDA VTxd VRxd - 0.5 - 0.5 - 0.5 Ptot TJ Tamb Tstg 0 - 25 215
25 200 125 70 85 230 100 500 1 Vcc+0.5 Vcc+0.5 Vcc+0.5
mA mW C C C C mA mA A V V V <90s, t on<20% <2s, ton<10% s. TEMIC IrDA Design Guide s. derating curve, pg. 8
2
TFDT4000
Edition January 7, 1996
Optoelectronic characteristics
Tamb = 25C, V cc=5V unless otherwise noted. Parameter Transceiver Supported data rates Supply voltage range Supply current, pin 6 Supply current, pin 6 Leakage current of IR emitter , pin 1 Vcc=5V Vcc=3V Vcc, pin 6: Off, Txd: "LOW" Vcc2 = 6V T=-25C to 85C 50 s Time from switching on Vcc to established specified operation Base band Vcc IS IS IS 2.4 2.7 5 1.3 1.0 0.005 115.2 5.5 2.5 1.5 0.5 kBit/s V mA mA A s. appl. hint, page 6 IrDA SIR mode reduced function down to 2.5V Test condition Symbol MIN TYP MAX Unit Remark
Transceiver power on settling time Receiver Min. detection threshold irradiance, SC="LOW" Min. detection threshold irradiance, SC="HIGH" Max. detection threshold irradiance Max. detection threshold irradiance Logic Low Receiver Input Irradiance, SC="HIGH" or SC="LOW" Output voltage Rxd Output voltage Rxd Output current VOL<0.8V active non active =15 Eemin 0.020
0.035
Wm-2
SIR mode)
=15
Eemin
0.006
0.010
0.015
Wm-2
SIR mode **)
=90, Vcc=5V =90, Vcc=3V
Eemax Eemax
3300 8000
5000 15000
Wm-2 Wm-2
SIR mode **) SIR mode **)
Eemaxlow
0.004
Wm-2
VOL VOH Vcc-0.5
0.5
0.8
V V
C=15pF, R=2.2k C=15pF, R=2.2k
4
mA
)
BER=10 -8 (IrDA specification) 3
TFDT4000
Edition January 7, 1996
Optoelectronic characteristics
Tamb = 25C, V cc=5V unless otherwise noted. Parameter Receiver, cont. Rise time @load= C=15pF, R=2.2k Fall time @load= C=15pF, R=2.2k Rxd signal electrical output pulse width 2.4 kBit/s, input pulse length 1.41s to 3/16 of bit length 115.2 kBit/s, input pulse length 1.41s to 3/16 of bit length 500 kHz, duty cycle 50% Output level = 0.5*Vcc @ Ee=0.040 W/m 2 Jitter, leading edge of output signal Output delay time (Rxd) Over a period of 10bit, 115.2 kBd Output level = 0.5*Vcc tj tdt 2 6.5 s s Delay of trailing edge of output signal related to trailing edge of optical input signal tr tf tp 20 20 1.41 200 200 20 ns ns s Test condition Symbol MIN TYP MAX Unit Remark
Rxd signal electrical output pulse width
tp
1.41
8
s
Rxd signal electrical output pulse width Output delay time (Rxd)
tp tdl
0.8
1 1
1.2 2
s s
Vcc = 5 V only Delay of leading edge of output signal related to leading edge of optical input signal
Latency
Recovery from last transmitted pulse to 1.1*threshold sensitivity
tL
100
800
s
Transmitter Driver current IRED Current limiting resistor in series to IRED: RS= 8.2 @ 5 Vcc2=5V Id 0.3 0.5 A Id can be adjusted by variation of R S, see appl. hint page 6
Logic Low Transmitter Input Voltage Logic High Transmitter Input Voltage
VIL(Txd) VIH(Txd)
0 2.4
0.8 Vcc
V V
4
TFDT4000
Edition January 7, 1996
Optoelectronic characteristics
Tamb = 25C, V cc=5V unless otherwise noted. Parameter Transmitter, cont. Output Radiant Intensity, =15 Current limiting resistor in series to IRED: RS = 8.2 , Vcc2=5V p 850 60 115.2 kHz square wave signal (duty cycle: 1:1) logic low level 200 600 45 150 200 mW/sr in agreement with prospective future eye safety limits of IEC825 900 nm nm ns Test condition Symbol MIN TYP MAX Unit Remark
Angle of half intensity Peak wavelength of emission Halfwidth of Emission Spectrum Optical Rise/Falltime
24
Output Radiant Intensity Overshoot, optical Rising edge peak to peak jitter
0.04 25
W/sr % s
Over a period of 10 bits, independent of information content
tj
0.2
5
TFDT4000
Edition January 7, 1996
Mechanical Dimensions
Package Outlline Drawing. Dimensions in mm Pin Assignment
Pin# 1 2 3 4 5 6 7 8 PIN NAME IRED Anode IRED Cathode Txd Rxd NC Vcc SC GND Supply voltage Sensitivity control Ground I HIGH IRED Anode IRED Cathode, internally connected to driver transistor Transmit data Received data DESCRIPTION I/O O O I O ACTIVE LOW LOW HIGH LOW
2 stand off pins Internally connected to ground 6
TFDT4000
Edition January 7, 1996
Recommended SMD pads for the TFDT4000 transceiver
600
max. duty cycle 20%
500
Current derating as a
function of the maximum forward current of IRED and max. duty cycle
Peak operating current [mA]
400
300
max. duty cycle 50%
200
100
0 0 20 40 60 80 100 120 140
Temperature [C]
Current derating as a function of ambient temperature and max. duty cycle
7
TFDT4000
Edition January 7, 1996 0 100% 10 20 30
Angular emission characteristic
50%
120
Rel. output intensity [%]
100
80
60
40
20
0 -60 -40 -20 0 20 40 60
Angle []
8
TFDT4000
Edition January 7, 1996
0 100%
10
20 30
Angular receiving characteristic
50%
100
Rel. sensitivity [%]
80
60
40
20
0
-60 -40 -20 0 20 40 60
Angle []
9

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