DARCHE R> TECHNICAL DATA AN EXCLUSIVE RADIO SHACK SERVICE TO THE EXPERIMENTER GP1U52X INFRARED RECEIVER/DEMODULATOR Features: @ Rejects all sources not modulated at 40kHz for reliable operation Compact size for miniature applications Operates from 5V, making direct connection to TTL or CMOS components easy Goil-free design provides total immunity from external noise induced by magnatic fields @ Built-in low-pass filter on the power supply helps isolate the Circuitry from power supply noise General Description The GP1US2X Infrarad Aeceiver/Demodulator is a hybrid IC/in- frared detector circuit designed for use as a highly reliable in frared detector for televisions, VCRs, audio components, and so on. it iS also ideal as a low-cost detector for hobbiest applica- tians The GP1U52X% uses a pin photo diode that has its peak sen- sitivity in the Near infrared range. The built-in fitter biocks visible ght to reduce or eliminate false Operation Caused by other light SOuUrces. The output of the photo diode feeds into a prearmplitiar/limiter to provide a clean signal to the rest of the circuit, The band pass fil- ter then rejects all signals outside the pass band (40 kHz +/- 4ktiz), The remaining signal is fed to the demodulator, integrator, and wave-shaper circuit (see the Block Diagram). The output is a clean waveform without the carer. Package Outline MARKING =. .\\ .286 ERD 130-4] r te | L, 1Vout } tao tt 2Vec too f ET . = thy 3GNDB 2097.02 | a LIMITER AMP FILTER @ 1 ay ra ea | BAND PASS +} US [Le > Vout @) INTEGRATOR COMPARATOR Vee GND DEMODULATOR | Bn ms om & JUL omar )stk Timing Diagram Block Diagram Specifications Maximum Supply Voitage... ee 6.3 Recommended Operating Voltage . Naso TAY Current Dissipation (IGC)...........-. . B.0MA Bandpass Genter Fraquency..,.....-..-.-5-.-+ 40 kHz 3dB Band Width of 40 KHZ... ee 4 KHZ Infrared Passband............... oe . 980 AM +/- 100 AmSAMPLE APPLICATION The following presents a sample transmitter and receiver circult incorporating the GP1US2X. The transmitter circuit uses two timers (both sides of a 556 Dual Timer) to drive an infrared LED and transmit a tone, The receiver uses a 567 Tone Decoder to provide an on/off indication when you activate the transmitter. Set the first timer in the 556 to oscillate at from 100 to 1000 Hz. The output of this timer then inhibits the running of the second timer, which is set to oscillate at 40kHz. The output of the second timer drivas an infrared LED. The output of the GP1US52X drives a simple one-transistor amplifier. This transistor is capacitively coupled to the input of the 567 tone decoder. Whenever the 567 detects a frequency within its bandpass, it drives its output high, lighting an LED. ath. 144613: 12 11 #10 566 2 3 4 1 10K FREQUENCY TRANSMITTER *Ground Pin 6 and adjust for 40 KHz + 2 kHz from Pin 8 with parallel/series resistance. You can expand this circuit by adding additional tone decoders, and using a switch to change the modulated tones frequency. This allows you to have multiple functions trom the remote con- trol unit, Because of the response characteristics of the GP1U52Xx, the modulated tone must be between 100 Hz and 1000 Hz, and tones must be at least 150Hz apart for good detection. _ 6 VOLTS MPS22224 O4tut GENERAL PURPOSE SWITCHING TRANZISTOR Va m BY (6.8V MA) RECEIVER