The **TSOP754..W** series is a miniaturized receiver for infrared (IR) remote control systems. These components are highly integrated and designed to handle modulated IR signals while suppressing ambient light interference. ### 1. Key Technical Specifications The ".." in the part number represents the carrier frequency (e.g., TSOP754**38** operates at 38 kHz). | Parameter | Specification | | :--- | :--- | | **Supply Voltage ($V_S$)** | 2.5 V to 5.5 V | | **Supply Current ($I_S$)** | 0.35 mA (typ) | | **Carrier Frequency ($f_0$)** | 30 kHz to 56 kHz (variant dependent) | | **Transmission Distance** | Up to 45 meters | | **Directivity** | Half angle $\phi = \pm 45^\circ$ | | **Output Type** | Active Low (NPN open collector with internal pull-up) | --- ### 2. Internal Components and Architecture The device integrates several functional blocks into a single epoxy package: 1. **Photo Diode:** Converts IR light pulses into electrical signals. 2. **Preamplifier:** Boosts the weak signal from the photo diode. 3. **Automatic Gain Control (AGC):** Adjusts sensitivity to compensate for different light conditions and distances. 4. **Band Pass Filter:** Specifically tuned to the carrier frequency ($f_0$) to filter out noise from other IR sources (like sunlight or fluorescent lamps). 5. **Demodulator:** Removes the carrier wave and outputs the original data signal. --- ### 3. Pin Configuration The TSOP754..W series typically features a standard 3-pin layout: | Pin Number | Name | Function | | :--- | :--- | :--- | | **1** | **OUT** | Data output; connects to a microcontroller interrupt or I/O pin. | | **2** | **GND** | Ground connection. | | **3** | **$V_S$** | Positive supply voltage. | --- ### 4. Application Circuit To ensure stable operation, a simple RC filter is recommended at the supply pin to eliminate power supply ripples. ```cpp // Typical Hardware Connection // [V_S] ---- [Resistor 100 Ohm] ----+---- Pin 3 (VS) // | // [Capacitor 4.7 uF] // | // [GND] ----------------------------+---- Pin 2 (GND) // // [MCU Pin] <---------------------------- Pin 1 (OUT) ``` --- ### 5. Distinguishing Features of the "W" Version The **"W" suffix** indicates specific characteristics in the Vishay catalog: * **Wide Side-view:** Often refers to the package orientation or enhanced viewing angles. * **High Immunity:** These modules are specifically designed to be immune to "noise" from modern energy-saving lamps (CFLs) and plasma TV panels.