## Overview of the MM1663D The **MM1663D** is a high-performance, monolithic IC designed primarily as a **Video Amplifier** with a built-in low-pass filter. It is commonly used in consumer electronics to drive video signals (like Composite or S-Video) from a digital-to-analog converter (DAC) to an output terminal (like an RCA jack). --- ### Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Supply Voltage ($V_{CC}$)** | 2.8V to 5.5V | | **Operating Current** | 7.0 mA (Typ.) | | **Power Down Current** | 1.0 $\mu$A (Max) | | **Voltage Gain** | 6 dB (Fixed) | | **LPF Characteristics** | 6.75 MHz / -0.1 dB (Flatness) | | **Output Type** | Single Channel | --- ### Internal Functional Blocks The MM1663D integrates several critical electronic components into a single 6-pin package: 1. **Low Pass Filter (LPF):** * It features a 5th-order Butterworth filter characteristic. * **Purpose:** Removes high-frequency sampling noise (aliasing) generated by the video DAC, ensuring a clean analog picture. 2. **6dB Gain Amplifier:** * Since video signals are often halved when terminated with a 75Ω load, this internal amp doubles the voltage ($2 \times$ or 6dB) to compensate for the loss. 3. **SAG Correction:** * Allows for the use of smaller output coupling capacitors without causing "tilt" or distortion in the low-frequency synchronization signals. 4. **Power Save Circuit:** * Includes a logic-controlled shutdown pin to reduce power consumption when the video output is not in use. --- ### Pin Configuration | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **IN** | Video signal input | | 2 | **VCC** | Power supply (typically 3.3V or 5V) | | 3 | **SAG** | SAG correction terminal | | 4 | **OUT** | Video signal output | | 5 | **GND** | Ground | | 6 | **PS** | Power Save (High = Active, Low = Standby) | --- ### Typical Application Circuit Example When designing with the MM1663D, the following basic configuration is standard: ```text Input Signal -> [0.1uF Cap] -> PIN 1 (IN) PIN 2 (VCC) -> [0.1uF Bypass Cap] to GND PIN 4 (OUT) -> [220uF Cap] -> 75 Ohm Resistor -> Output Jack PIN 6 (PS) -> Microcontroller GPIO (High for ON) ``` --- ### Common Use Cases * **Set-Top Boxes:** Processing CVBS (Composite) signals. * **DVD/Blu-ray Players:** Output buffering. * **Digital Cameras:** Driving the analog video out to a TV. * **Portable Media Players:** Low-power video driving.