Diglient Pmod VGA Video Graphics Array

Features and Specifications

• Standard VGA port for connecting commonly found displays
• 12-bit RGB444 color depth
• Simple, high-speed R-2R resistor ladder DAC
• High-speed buffers support pixel clocks up to 150 MHZ
• 1.7 in × 1.7 in (4.3 cm × 4.3 cm) PCB size
• Dual 12-pin Pmod connector with GPIO interface
• 3.3V Logic Levels
• Follows Digilent Pmod Interface Specification

The Pmod VGA (Rev. C) by Digilent provides a VGA port to any board with Pmod connectivity. The VGA port can be used to drive standard displays such as televisions and monitors. The host board must be capable of driving a fast parallel data bus in order to properly drive a display with the Pmod VGA. The Pmod VGA uses 14 input pins to create an analog VGA output port. This translates to 12-bit color depth and two standard sync signals: Horizontal Sync (HS) and Vertical Sync (VS). The digital-to-analog conversion is done using a simple R-2R resistor ladder. The ladder works in conjunction with the 75-ohm termination resistance of the VGA display to create 16 analog signal levels for the red, blue, and green VGA signals. This circuit produces video color signals that proceed in equal increments between 0V (fully off) and 0.7V (fully on). With 4 bits each for red, blue, and green, 4096 (16x16x16) different colors can be displayed, one for each unique 12-bit pattern.

Pmod Series Overview

The Digilent Pmod (peripheral module) Series is a small, low-cost peripheral module that can be used with a wide range of embedded systems and development boards. It is designed to extend the capabilities of embedded systems and development boards by adding new features and functionality. The Pmod communicates with host boards using 6, 8 or 12-pin connectors that can carry multiple digital control signals, taking advantage of standard serial protocols such as SPI and I²C. This allows for more effective designs by routing analog signals and power supplies only where they are needed and away from digital controller boards.

What's in the Box

• Pmod VGA
• Custom antistatic Pmod packaging