The **TSOP935..P16TR** series refers to a high-performance, miniaturized receiver module for infrared (IR) remote control systems. These components are designed by Vishay Intertechnology and are widely used for wireless data transmission in consumer electronics. --- ### 1. Key Technical Specifications The TSOP935 series is known for its high sensitivity and ability to suppress noise from environmental light sources (like fluorescent lamps). | Feature | Specification | | :--- | :--- | | **Package Type** | Belobog (Surface Mount - SMD) | | **Carrier Frequency** | 30 kHz to 56 kHz (Specific to the model number) | | **Supply Voltage ($V_S$)** | 2.0 V to 3.6 V | | **Supply Current ($I_S$)** | 0.35 mA to 0.45 mA | | **Transmission Distance** | Up to 40 meters (typical) | | **Directivity** | $\pm$ 45 degrees | --- ### 2. Functional Block Diagram Components Internally, the TSOP935 contains several critical electronic stages to ensure signal integrity: 1. **Photodetector:** A high-speed PIN diode that converts incoming IR light into an electrical current. 2. **Preamplifier:** Boosts the weak signal from the photodiode. 3. **Automatic Gain Control (AGC):** Dynamically adjusts sensitivity to manage ambient light noise and different signal strengths. 4. **Band Pass Filter:** Specifically tuned to the carrier frequency (e.g., 38 kHz) to filter out DC light and other frequencies. 5. **Demodulator:** Removes the carrier frequency and outputs the clean data signal. --- ### 3. Pin Configuration The "P16TR" designation refers to the specific taping and orientation for surface mount assembly. The physical layout usually follows this pinout: | Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | **OUT** | Demodulated data output (Active Low) | | 2 | **GND** | Ground connection | | 3 | **$V_S$** | Supply voltage (VCC) | | 4 | **GND** | Additional Ground/Shielding | --- ### 4. Application Guidelines To ensure stable operation, it is recommended to implement a simple RC filter on the supply line to prevent noise from entering the sensitive preamplifier. ```c // Example RC Filter Setup Vs Line ---- [ 100 Ohm Resistor ] ----+---- Pin 3 (Vs) | [ 4.7uF Cap ] | GND ``` ### 5. Part Number Breakdown * **TSOP935:** The base series name (Surface mount, high AGC performance). * **.. (Frequency):** e.g., "38" stands for 38 kHz. * **P16:** Refers to the physical mold/package shape. * **TR:** Tape and Reel (Packaging for automated assembly). ---