TFDT4000

TFDT4000 TEMIC | Alldatasheet

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Technical content

Edition January 7, 1996 TFDT4000 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 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 Open Collector Driver Driver ComparatorAmplifier AGC logic

8 GND

3 Txd

Edition January 7, 1996 TFDT4000 Absolute maximum ratings Reference Point Pin 8, unless otherwise noted. Parameter Test Conditions Symbol MIN TYP MAX Unit Remark Supply Voltage Range Vcc - 0.5 6 V Voltage Range of IRED Drive Output pin 1, Txd "LOW" - 0.5 6 V Input Currents all pins except 1, 8, see IRED current 10 mA Output Sinking Current 25 mA Power Dissipation Ptot 200 mW s. derating curve, pg. 8 Junction Temperature TJ 125 °C Ambient Temperature Range (Operating) Tamb 0 70 °C Storage temperature range Tstg - 25 85 °C Soldering temperature t= 20 s @215°C 215 230 °C s. TEMIC IrDA Design Guide Average IRED current IIRED(DC) 100 mA Rep. pulsed IRED current IIRED(RP) 500 mA <90µs, ton<20% Peak IRED current IIRED(PK) 1 A <2µs, ton<10% IRED Anode Voltage VIREDA - 0.5 Vcc+0.5 V Transmitter Data Input Voltage VTxd - 0.5 Vcc+0.5 V Receiver Data Output Voltage VRxd - 0.5 Vcc+0.5 V

Edition January 7, 1996 TFDT4000 Optoelectronic characteristics Tamb = 25°C, Vcc=5V unless otherwise noted. Parameter Test condition Symbol MIN TYP MAX Unit Remark Transceiver Supported data rates Base band 2.4 115.2 kBit/s IrDA SIR mode Supply voltage range Vcc 2.7 5 5.5 V reduced function down to 2.5V Supply current, pin 6 Vcc=5V IS 1.3 2.5 mA Supply current, pin 6 Vcc=3V IS 1.0 1.5 mA Leakage current of IR emitter , pin 1 Vcc, pin 6: Off, Txd: "LOW" Vcc2 = 6V T=-25°C to 85°C IS 0.005 0.5 µA s. appl. hint, page 6 Transceiver power on settling time 50 µs Time from switching on Vcc to established specified operation Receiver Min. detection threshold irradiance, SC="LOW" α=±15° Eemin 0.020 0.035 Wm-2 SIR mode∗∗) Min. detection threshold irradiance, SC="HIGH" α=±15° Eemin 0.006 0.010 0.015 Wm-2 SIR mode ) Max. detection threshold irradiance α=±90°, Vcc=5V Eemax 3300 5000 Wm-2 SIR mode ) Max. detection threshold irradiance α=±90°, Vcc=3V Eemax 8000 15000 Wm-2 SIR mode **) Logic Low Receiver Input Irradiance, SC="HIGH" or SC="LOW" Eemaxlow 0.004 Wm-2 Output voltage Rxd active VOL 0.5 0.8 V C=15pF, R=2.2k Output voltage Rxd non active VOH Vcc-0.5 V C=15pF, R=2.2k Output current VOL<0.8V 4 mA ∗∗) BER=10-8 (IrDA specification)

Edition January 7, 1996 TFDT4000 Optoelectronic characteristics Tamb = 25°C, Vcc=5V unless otherwise noted. Parameter Test condition Symbol MIN TYP MAX Unit Remark Receiver, cont. Rise time @load= C=15pF, R=2.2k tr 20 200 ns Fall time @load= C=15pF, R=2.2k tf 20 200 ns Rxd signal electrical output pulse width 2.4 kBit/s, input pulse length 1.41µs to 3/16 of bit length tp 1.41 20 µs Rxd signal electrical output pulse width 115.2 kBit/s, input pulse length 1.41µs to 3/16 of bit length tp 1.41 8 µs Rxd signal electrical output pulse width 500 kHz, duty cycle 50% tp 0.8 1 1.2 µs Vcc = 5 V only Output delay time (Rxd) Output level = 0.5*Vcc @ Ee=0.040 W/m2 tdl 1 2 µs Delay of leading edge of output signal related to leading edge of optical input signal Jitter, leading edge of output signal Over a period of 10bit, 115.2 kBd tj 2 µs Output delay time (Rxd) Output level = 0.5*Vcc tdt 6.5 µs Delay of trailing edge of output signal related to trailing edge of optical input signal Latency Recovery from last transmitted pulse to 1.1*threshold sensitivity tL 100 800 µs Transmitter Driver current IRED Current limiting resistor in series to IRED: RS= 8.2 Ω @ 5 Vcc2=5V Id 0.3 0.5 A Id can be adjusted by variation of RS, see appl. hint page 6 Logic Low Transmitter Input Voltage VIL(Txd) 0 0.8 V Logic High Transmitter Input Voltage VIH(Txd) 2.4 Vcc V

Edition January 7, 1996 TFDT4000 Optoelectronic characteristics Tamb = 25°C, Vcc=5V unless otherwise noted. Parameter Test condition Symbol MIN TYP MAX Unit Remark Transmitter, cont. Output Radiant Intensity, α=±15° Current limiting resistor in series to IRED: RS = 8.2 Ω , Vcc2=5V 45 150 200 mW/sr in agreement with prospective future eye safety limits of IEC825 Angle of half intensity α ±24 ° Peak wavelength of emission λp 850 900 nm Halfwidth of Emission Spectrum 60 nm Optical Rise/Falltime 115.2 kHz square wave signal (duty cycle: 1:1) 200 600 ns Output Radiant Intensity logic low level 0.04 µW/sr Overshoot, optical 25 % Rising edge peak to peak jitter Over a period of 10 bits, independent of information content tj 0.2 µs

Edition January 7, 1996 TFDT4000 Mechanical Dimensions Package Outlline Drawing. Dimensions in mm Pin Assignment Pin# PIN NAME DESCRIPTION I/O ACTIVE

1 IRED Anode IRED Anode O LOW

2 IRED Cathode IRED Cathode, internally connected to

3 Txd Transmit data I HIGH

4 Rxd Received data O LOW

6 Vcc Supply voltage

7 SC Sensitivity control I HIGH

8 GND Ground

• 2 stand off pins Internally connected to ground

Edition January 7, 1996 TFDT4000 Recommended SMD pads for the TFDT4000 transceiver 100 200 300 400 500 600 0 20 40 60 80 100 120 140 Temperature [°C] Peak operating current [mA] Current derating as a function of the maximum forward current of IRED and max. duty cycle max. duty cycle 20% max. duty cycle 50% Current derating as a function of ambient temperature and max. duty cycle

Edition January 7, 1996 TFDT4000 0° 10° 20° 30° 100% 50% 100 120 -60 -40 -20 0 20 40 60 Angle [°] Rel. output intensity [%] Angular emission characteristic

Edition January 7, 1996 TFDT4000 0° 10° 20° 30° 100% 50% 100 -60 -40 -20 0 20 40 60 Angle [°] Rel. sensitivity [%] Angular receiving characteristic