The **LS404C** is a high-performance quad operational amplifier (Op-Amp) designed specifically for high-quality audio applications and precision signal processing. It belongs to the family of wide-bandwidth, low-noise amplifiers. --- ### ## 1. Technical Specifications The following table summarizes the key electrical characteristics of the LS404C: | Parameter | Specification | | :--- | :--- | | **Number of Channels** | 4 (Quad) | | **Supply Voltage Range** | ±3V to ±18V | | **Gain Bandwidth Product** | 3.0 MHz | | **Slew Rate** | 1.5 V/µs | | **Input Noise Voltage** | 15 nV/√Hz | | **Input Offset Voltage** | 2.0 mV (Typical) | | **Operating Temperature** | 0°C to 70°C | | **Package Types** | DIP-14, SO-14 | --- ### ## 2. Internal Architecture & Pinout The LS404C consists of four independent, internally compensated operational amplifiers. They are designed to operate from a single power supply or split supplies. #### **Standard Pin Configuration (DIP-14/SO-14):** 1. **Output 1** 2. **Inverting Input 1** 3. **Non-inverting Input 1** 4. **V+ (Positive Supply)** 5. **Non-inverting Input 2** 6. **Inverting Input 2** 7. **Output 2** 8. **Output 3** 9. **Inverting Input 3** 10. **Non-inverting Input 3** 11. **V- (Ground/Negative Supply)** 12. **Non-inverting Input 4** 13. **Inverting Input 4** 14. **Output 4** --- ### ## 3. Key Features * **Low Distortion:** Optimized for high-fidelity audio reproduction. * **Short-Circuit Protection:** The outputs are protected against accidental shorts to ground or rails. * **No Latch-up:** The design prevents the "latch-up" effect common in older CMOS or bipolar op-amps. * **High Gain:** Provides high open-loop gain for precise feedback control. --- ### ## 4. Applications The LS404C is versatile but most commonly found in: * **Audio Preamplifiers:** Due to its low noise and high bandwidth. * **Active Filters:** Used in crossovers or equalizers. * **Signal Conditioning:** Converting sensor data into measurable voltages. * **Industrial Controls:** Used in instrumentation where four amplifiers are needed in a compact space.