The **TSOP963..** series is a miniaturized surface-mount (SMD) infrared (IR) receiver module designed for infrared remote control systems. It integrates a PIN diode and a preamplifier into a single package, acting as the "ear" for electronic devices. --- ## 1. Internal Functional Block Diagram The internal circuitry of the TSOP963.. consists of several critical stages that process the incoming light signal: | Component | Function | | :--- | :--- | | **PIN Photodiode** | Converts infrared light (typically 940nm) into a small electrical current. | | **Preamplifier** | Amplifies the weak signal from the photodiode. | | **Automatic Gain Control (AGC)** | Adjusts sensitivity to filter out ambient noise (sunlight, CFL bulbs). | | **Band Pass Filter** | Only allows the specific carrier frequency (e.g., 38kHz) to pass. | | **Demodulator** | Removes the carrier frequency and outputs the original data envelope. | --- ## 2. Technical Specifications The ".." in the part number represents the carrier frequency. For example, **TSOP96338** is tuned to 38kHz. ### Electrical Characteristics * **Supply Voltage ($V_S$):** 2.0 V to 3.6 V (optimized for low-power mobile devices). * **Supply Current ($I_S$):** Very low, typically 0.35 mA to 0.45 mA. * **Transmission Distance:** Up to 40 meters (with a standard IR LED). * **Output Type:** Active Low (the output drops to 0V when a signal is detected). --- ## 3. Pin Configuration The TSOP963.. usually comes in a 4-pin or 3-pin SMD side-view package. | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **GND** | Ground (0V) | | 2 | **$V_S$** | Positive Supply Voltage | | 3 | **OUT** | Demodulated Data Output (Connect to MCU) | | 4 | **NC / GND** | No Connection or Ground (depending on specific sub-package) | --- ## 4. Key Design Features * **Small Form Factor:** Designed for side-view mounting on PCBs, saving vertical space. * **Robust Noise Suppression:** High immunity against optical noise (fluorescent lamps, plasma TV emissions). * **Protocol Support:** Versions of the TSOP963 (AGC3) are specifically optimized for long-burst codes and suppressed noise environments (e.g., Sony or NEC protocols). --- ## 5. Typical Application Circuit To use the TSOP963.. in a project, a simple RC filter is recommended to stabilize the power supply: ```text +3.3V | [R1: 100 Ohm] | +-------+------- (Vs Pin) | | [C1: 4.7uF] [TSOP963..] | | GND (GND Pin) | (OUT Pin) ----> To Arduino/Microcontroller GPIO ```