## Overview of the MM1663H The **MM1663H** is a specialized integrated circuit (IC) primarily designed as a **Video Amplifier** with a built-in low-pass filter. It is manufactured by MinebeaMitsumi (formerly Mitsumi Electric). This component is commonly used in consumer electronics to drive video signals (Composite, Y, or C) to external outputs. --- ### Key Specifications and Features | Feature | Description | | :--- | :--- | | **Function** | 1-Channel Video Amplifier with LPF | | **Operating Voltage** | 2.8V to 5.5V (Single Supply) | | **Current Consumption** | ~7.0 mA (Typ) | | **Standby Current** | 1.0 $\mu$A (Max) | | **LPF Characteristics** | 5th Order Butterworth (6.75 MHz) | | **Voltage Gain** | 6dB (Fixed) | | **Output Configuration** | AC-Coupled or DC-Coupled | --- ### Internal Functional Blocks 1. **Low Pass Filter (LPF):** It features a 5th-order filter designed to remove high-frequency noise and sampling artifacts (aliasing) from the video signal, ensuring a clean image output. 2. **6dB Amplifier:** Video signals often lose amplitude during processing. The 6dB gain doubles the voltage to compensate for the termination loss in standard 75$\Omega$ video lines. 3. **SAG Correction:** The "H" variant often supports SAG correction, which allows for smaller output coupling capacitors while maintaining low-frequency response (preventing "tilt" in the video signal). 4. **Power Save Circuit:** Includes a power-down pin to reduce power consumption when the video output is not in use. --- ### Pin Configuration (Common SOP-8/SOT-26) While packaging can vary, the typical pinout logic includes: * **Vcc:** Positive power supply. * **GND:** System ground. * **Vin:** Video signal input (usually from a DAC or SoC). * **Vout:** Amplified video signal output. * **SW (Power Save):** High for active mode, Low for standby. * **SAG:** Connection point for the SAG correction capacitor. --- ### Typical Applications * **Digital Still Cameras (DSC):** Driving the TV-out signal. * **Portable Media Players:** Handheld video playback devices. * **Set-Top Boxes:** Standard definition (SD) video output. * **Security Cameras:** Analog signal transmission over coaxial cables. --- ### Circuit Example (Conceptual) ```mermaid graph LR A[Video DAC] --> B(MM1663H Input) B --> C{6dB Amp + LPF} C --> D[SAG Correction Cap] D --> E(75 Ohm Video Out) ```