**ADV7127KR50: A Comprehensive Technical Overview of the Triple 8-Bit High-Speed Video DAC**
The **ADV7127KR50 (ADV7127)** from Analog Devices is a monolithic, triple-channel, high-speed digital-to-analog converter (DAC) specifically engineered for a wide range of video and graphics applications. It stands as a pivotal component in systems where the precise and rapid conversion of digital pixel data into high-fidelity analog signals is paramount. This integrated circuit is designed to meet the demanding requirements of modern display technologies, from high-resolution computer monitors to professional video equipment.
**Architecture and Core Functionality**
At its heart, the ADV7127 comprises three separate, high-performance, 8-bit video DACs. Each DAC is paired with a corresponding **high-impedance, analog output current source**. The device operates on a single supply voltage, typically **+5 V or +3.3 V**, enhancing its versatility in different system designs. A key architectural feature is its **separate color palette (CLUT) bypass path**. This allows for direct input of pixel data, which is crucial for true-color applications where a palette is not required, thereby simplifying the data path and reducing latency.
The digital inputs for each channel are TTL-compatible, facilitating easy interfacing with standard digital ASICs, FPGAs, and graphics controllers. The device incorporates advanced, proprietary **CMOS process technology**, which is instrumental in achieving its high-speed performance while maintaining relatively low power consumption.
**Performance Characteristics**
The ADV7127KR50 is distinguished by its exceptional speed. It boasts a **maximum DAC sampling rate of 50 MSPS (Mega Samples Per Second)**, making it capable of supporting high-resolution video modes. This includes resolutions such as **UXGA (1600 x 1200)** at 60 Hz refresh rates and beyond, ensuring sharp and flicker-free images.
The analog outputs provide a nominal current of 2.0 mA to 26.5 mA, which can be easily configured using an external resistor (**RSET**). This current output architecture allows for simple interfacing with various loads, typically a 75Ω doubly-terminated video cable, through a standard video operational amplifier. The device exhibits excellent differential non-linearity (DNL) and integral non-linearity (INL), which are critical for maintaining color accuracy and minimizing visual artifacts like banding in gradients.
**Key Applications**
The triple DAC architecture makes the ADV7127 an ideal solution for driving RGB (Red, Green, Blue) analog components in numerous systems. Its primary applications include:
* **High-Resolution Color Graphics Systems:** Driving analog CRT (Cathode Ray Tube) monitors from digital graphics cards.
* **Digital Video Systems:** Used in video editing suites, broadcast equipment, and digital set-top boxes for composite video or component video output.
* **Medical Imaging Displays:** Where precise grayscale and color representation is critical.
* **Industrial Imaging and Acquisition Systems.**
**Package and Reliability**
The ADV7127KR50 is offered in a compact, surface-mount **44-Lead LQFP (Low-Profile Quad Flat Pack)** package. This package is designed for robust mechanical and thermal performance, suitable for automated assembly processes common in high-volume manufacturing. The device is specified over the industrial temperature range (-40°C to +85°C), ensuring reliable operation in challenging environments.
**ICGOODFIND**
The **ADV7127KR50** remains a benchmark **Triple 8-Bit Video DAC**, delivering a critical blend of **high-speed performance (50 MSPS)**, integration, and reliability. Its design, featuring a **CLUT bypass** and flexible supply operation, has cemented its role as a fundamental component in legacy and specialized modern video signal chains, translating digital precision into analog excellence.
**Keywords:**
1. **Video DAC**
2. **High-Speed**
3. **Triple 8-Bit**
4. **50 MSPS**
5. **Analog Output**
