The **TSOP986** series belongs to the Vishay family of miniaturized IR receiver modules designed for infrared remote control systems. These components are highly integrated, combining a photodiode and a preamplifier into a single package. --- ## 1. Key Technical Specifications The TSOP986 is engineered to operate in environments with high optical noise. Below are the primary technical parameters: | Parameter | Value / Range | | :--- | :--- | | **Supply Voltage ($V_S$)** | 2.0 V to 3.6 V | | **Supply Current ($I_S$)** | 0.35 mA (typical) | | **Carrier Frequency ($f_0$)** | 30 kHz to 56 kHz (Specific to sub-model) | | **Transmission Distance** | Up to 40 meters | | **Directivity** | $\pm$ 45 degrees | | **Output Type** | Active Low (CMOS/TTL compatible) | --- ## 2. Internal Architecture The device acts as more than just a light sensor; it is a signal processor. It contains: 1. **PIN Photodiode:** Converts infrared light into electrical current. 2. **Preamplifier:** Amplifies the weak signal from the photodiode. 3. **Automatic Gain Control (AGC):** Adjusts sensitivity to suppress noise (from sunlight or fluorescent bulbs). 4. **Band Pass Filter:** Only allows the carrier frequency (e.g., 38kHz) to pass through. 5. **Demodulator:** Removes the carrier wave and outputs the data pulses. --- ## 3. Circuit Connection (Pinout) The TSOP986 typically features a 3-pin configuration. For stable operation, a simple RC filter is recommended to prevent power supply ripples from affecting the internal AGC. ### Schematic Representation ```text VCC >-------[ 100 Ohm Resistor ]---+---( Pin 3: VS ) | [ 4.7uF Cap ] | GND >------------------------------+---( Pin 2: GND ) DATA >---------------------------------( Pin 1: OUT ) ``` --- ## 4. Why Use TSOP986? * **Low Power Consumption:** Ideal for battery-operated devices. * **Immunity to Noise:** Excellent rejection of DC light (sunlight) and optical noise from CFL/LED lamps. * **Small Footprint:** The "9" series indicates a side-view surface mount or small-lead package, saving PCB space compared to older TSOP48 series. * **Protocol Support:** Compatible with most common IR protocols like RC5, RC6, Panasonic, and NEC. --- ## 5. Usage Considerations To ensure reliable data transmission, follow these timing rules: * **Burst Length:** The IR signal must be sent in bursts of at least 10 cycles. * **Gap Time:** There must be a minimum gap time between bursts to allow the AGC to reset. * **Wavelength:** The peak sensitivity is at **940 nm**, so ensure the IR transmitter (LED) matches this wavelength.