The **TSOP754 series** consists of miniaturized IR receiver modules for infrared remote control systems. These components integrate a PIN diode and a preamplifier on a single lead frame, while the epoxy package acts as an IR filter. --- ### 1. Key Technical Specifications The TSOP754 series is highly regarded for its low power consumption and high immunity against ambient light. | Parameter | Value / Description | | :--- | :--- | | **Supply Voltage ($V_S$)** | 2.5 V to 5.5 V | | **Supply Current ($I_S$)** | 0.35 mA (Typ.) | | **Transmission Distance** | Up to 45 meters | | **Carrier Frequency** | 30 kHz to 56 kHz (model dependent) | | **Directivity** | Angle of half transmission distance: $\pm$ 45° | | **Output Low Voltage** | 100 mV (at $I_{OSL} = 0.5$ mA) | --- ### 2. Internal Block Diagram components The "Electronic Parts" inside the TSOP754 package include several functional stages: 1. **PIN Photodiode:** Converts the incoming IR light pulses into an electrical signal. 2. **Preamplifier:** Boosts the weak signal from the photodiode. 3. **Automatic Gain Control (AGC):** Adjusts sensitivity to compensate for noise and varying distances. 4. **Band Pass Filter:** Specifically tuned to the carrier frequency (e.g., 38kHz) to suppress interference from CFLs or sunlight. 5. **Demodulator:** Strips the carrier frequency to output the original data signal (logic low/high). --- ### 3. Pin Configuration The TSOP754 typically uses a 3-pin layout: * **Pin 1 (OUT):** Data output (active low). * **Pin 2 (GND):** Ground connection. * **Pin 3 ($V_S$):** Power supply input. --- ### 4. Typical Application Circuit To ensure stability and protect the component from power supply ripples, a simple RC filter is recommended. ```c // Schematic Representation +5V Supply | [R1: 100 Ohm] | +-------[ Pin 3: Vs ] | [C1: 4.7uF] | GND <----[ Pin 2: GND ] Microcontroller Pin <----[ Pin 1: OUT ] ``` --- ### 5. Part Numbering (Frequency Variations) The last two digits of the TSOP754 series indicate the carrier frequency it is tuned for: * **TSOP75430:** 30 kHz * **TSOP75436:** 36 kHz * **TSOP75438:** 38 kHz (Most common for TV remotes) * **TSOP75440:** 40 kHz * **TSOP75456:** 56 kHz