Linear Technology has introduced demonstration circuit 2459A, featuring the LTC1668, 50Msps, 16-bit digital-to-analog converter (DAC), a popular option for applications with analog frequency content between the audio range and several megahertz.

DC2459A is a complete redesign of the original demonstration circuit. Several signal conditioning options are available for the analog output, and digital signals may be provided by one of several low cost, easy to use FPGA development boards. Example FPGA code is provided, which produces digital sine wave data for the DAC.

A 50Msps DAC requires a carefully laid out board, and a digital signal source to go with it. A benchtop digital pattern generator is the tool of choice, but is an expensive proposition for those who don’t own want or just need to evaluate a DAC. However, there are a number of boards such as DC2459A that provide makers with access to high performance devices, example code and laid out PC board for projects and prototyping.

One of the digital connectors on DC2459A is directly compatible with the popular “Mojo” Spartan 6 FPGA board from Embedded Micro. The Mojo also features an onboard ATmega32U4 processor with Arduino bootloader, providing options for controlling the LTC1668, or leveraging Linduino code to add additional analogue and mixed-signal functionality.

Linear LTC1668 block Figure 1: LTC1668 block diagram (Source: Linear)