TSOP 1838 IR receiver

TSOP 1838 IR receiver


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The TSOP18.. ­ series are miniaturized receivers for infrared remote control systems. PIN diode and preamplifier are assembled on lead frame, the epoxy package is designed as IR filter. The demodulated output signal can directly be decoded by a microprocessor. The main benefit is the reliable function even in disturbed ambient and the protection against uncontrolled output pulses.


Photo detector and preamplifier in one package Internal filter for PCM frequency TTL and CMOS compatibility Output active low Improved shielding against electrical field disturbance

D Small size package D Enhanced immunity against all kinds of
D No occurrence of disturbance pulses at the D Short settling time after power on (<200ms)
3 Input Control Circuit kW 1 PIN AGC Band Pass Demodulator 2

Tamb = 25_C Parameter Supply Voltage Supply Current Output Voltage Output Current Junction Temperature Storage Temperature Range Operating Temperature Range Power Consumption Soldering Temperature Test Conditions (Pin 3) (Pin 3) (Pin 1) (Pin 1) Symbol IO Tj Tstg Tamb Ptot Tsd Value Unit mW °C

Tamb = 25_C Parameter Supply y Current ( (Pin 3) ) Test Conditions = 40 klx, sunlight Transmission Distance = 0, test signal see fig.6, IR diode 300 mA Output Voltage Low (Pin 1) IOSL = 0.5 mA,Ee = fo Irradiance ­ 40 kHz) Pulse width tolerance: tpi 5/fo < tpo < tpi + 5/fo, Irradiance (56 kHz) test signal (see fig.6) Irradiance Directivity Angle of half transmission distance Symbol ISD ISH d VOSL Ee min Ee min Ee max Min 0.7 Typ 1.2 35 Max 1.25 Unit mW/m2 W/m2 deg

only necessary to suppress power supply disturbances tolerated supply voltage range < 5.5V

The circuit of the TSOP18… is designed in that way that unexpected output pulses due to noise or disturbance signals are avoided. A bandpassfilter, an integrator stage and an automatic gain control are used to suppress such disturbances. The distinguishing mark between data signal ( not suppressed) and disturbance signal (supressed) are carrier frequency, burst length and Signal Gap Time (see diagram below). The data signal should fullfill the following condition:· Carrier frequency should be close to center frequency of the bandpass (e.g. 38kHz).· Burst length should be 6 cycles/burst or longer.· After each burst a gap time of at least 9 cycles is neccessary.· The data format should not make a continuous signal transmission. There must be a Signal Gap Time (longer than 14ms) at least each 90ms Some examples for suitable data format are: NEC Code (repetitive pulse), NEC Code (repetitive data), Toshiba Micom Format, Sharp Code, RC5 Code, RECS­80 Code, R­2000 Code. When a disturbance signal is applied to the TSOP18… it can still receive the data signal. However the sensitivity is reduced to that level that no unexpected pulses will occure. Some examples for such disturbance signals which are suppressed by the TSOP18… are:· DC light (e.g. from tungsten bulb or sunlight),· Continuous signal or at any other frequency,· Signals from fluorescent lamps.· Continuous IR signal (e.g. 1ms burst, 2ms pause)

Additional Information

Weight 0.000636 kg