IR Receiver Modules for Remote Control Systems
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To introduce TSOP75xxxW IR Receiver modules and their key features.
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IR Receiver Modules for Remote Control Systems
- 9. Suitable Data Format TSOP752xxW TSOP753xxW TSOP754xxW Minimum burst length 10 cycles/burst 6 cycles/burst 10 cycles/burst After each burst of length 10 to 70 cycles 6 to 35 cycles 10 to 35 cycles For bursts greater than 70 cycles 35 cycles 35 cycles Maximum number of continuous short bursts/second 1800 2000 1500 Recommended for NEC code Yes Yes Yes Recommended for RC5/RC6 code Yes Yes Yes Recommended for Sony code yes no Yes No No Recommended for Thomson 56 kHz code Yes Yes Yes Recommended for Sharp code Yes Yes Yes Suppression of interference from fluorescent lamps Most common disturbance signals are suppressed Most common disturbance signals are suppressed Even extreme disturbance signals are suppressed
Editor's Notes
- Welcome to the training module on IR Receiver Modules for Remote Control Systems.
- This training module will introduce TSOP75xxxW IR Receiver modules and their key features.
- Free ambient IR data transmission, IR remote control as well as most opto-electronic sensors and light barrier systems work with an optical wavelength between 870 nm and 950 nm. The emitter and detector components are highly efficient in this near IR wavelength band and can be manufactured at low cost. Data transmission in free space demands high interference immunity of the IR receiving modules. The receiver unit, waiting to receive signals, is bombarded with different optical and electromagnetic noise signals, which are omni-present in the ambient or generated by the electrical appliance itself. All optical sources with an emission spectrum in the reception bandwidth (830 nm to 1100 nm) of the detector can be considered as disturbance sources.
- Infrared remote control has become a standard part of home entertainment equipment and appliances. In all these products, signals are transmitted in the near infrared range with a wavelength between 840 nm and 960 nm. Remote control receiver modules must be extremely sensitive and yet should not react to interference from other sources of infrared light other than the intended one. Multiple systems must operate in close vicinity without disturbing each other and also should not be affected by environmental noise signals such as ambient light, electromagnetic interference or supply voltage ripple. Vishay offers a wide variety of different types of IR receiver modules in order to address the needs of the particular application being considered.
- The TSOP75xxxW series are miniaturized receiver modules for infrared remote control systems. The lens-less design of the TSOP75xxxW devices results in excellent sensitivity-to-size ratio, with irradiance from 0.3 mW/sqm to 0.7 mW/sqm over a wide angle of ± 75°. The devices released are offered in three automatic gain control (AGC) versions. The TSOP752xxW is compatible with all common IR remote control data formats. The TSOP753xxW and TSOP754xxW suppress almost all spurious pulses from energy-saving fluorescent lamps, including dimmed LCD backlighting, and are compatible with short-burst or long-burst codes, respectively. The TSOP75xxxW devices offer low power consumption with a supply current of 0.35 mA typical at 3.3 V.
- The TSOP75xxxW series was designed to fulfill the needs of current and future consumer and laptop designs, where small space and re-flow solder technology are required. The devices are optimized for remote control and data transmission applications in small handheld electronics, such as notebook computers, digicams, and portable music and video players, as well as set-top boxes, thin LCD TVs, game controllers, navigation systems, and USB-TV.
- Here shows the simplified block diagram of TSOP75xxxW IR receivers. Two PIN diodes and a preamplifier are assembled on a leadframe, the epoxy package is designed as an IR filter. IR receiver control circuits provide feedback of the received signal to the automatic gain control (AGC) circuitry. This reduces the gain of the amplifier in the presence of noise signals to ensure that no spurious pulses are received and keeps the gain high if data is being received.
- The AGC circuitry utilizes some inherent differences to distinguish data from noise. But because there are so many different possible noise sources and coding schemes, no single AGC algorithm can completely suppress all noise and pass encoded data signals. To solve this problem, Vishay has developed four different AGC response algorithms based on coding schemes and ambient noise conditions. AGC1 is compatible with any coding scheme, it is optimized for continuous data transmission. AGC2 is optimized for most common remote control standard applications with typical long burst data formats. AGC3 is optimized for short burst data formats in noisy environments. AGC4 is optimized for most common remote control standard applications in very noisy environments (including dimmed LCD backlighting). AGC5 is optimized for short burst data formats in very noisy environments.
- The TSOP75xxxW series are designed to suppress spurious output pulses due to noise or disturbance signals. Data and disturbance signals can be distinguished by the devices according to carrier frequency, burst length and envelope duty cycle. The data signal should be close to the band-pass center frequency (e.g. 38 kHz) and fulfill the conditions in the table shown in the page. When a data signal is applied to the TSOP75xxxW in the presence of a disturbance signal, the sensitivity of the receiver is reduced to insure that no spurious pulses are present at the output.
- Here shows the typical application circuit for TSOP75xxxW IR receivers. The demodulated output signal can be directly decoded by a microprocessor. The resistor R1 and capacitor C1 are recommended for protection against EOS (electrical overstress).
- Thank you for taking the time to view this presentation on “ IR Receiver Modules for Remote Control Systems” . If you would like to learn more or go on to purchase some of these devices, you may either click on the part list link right beside the play button on the TechCast portal, or simply call our sales hotline. For more technical information you may either visit the Vishay site, or if you would prefer to speak to someone live, please call our hotline number, or even use our ‘live chat’ online facility. You may visit element14 e-community to post your questions.