Mixed Signal/Analog

12-bit DAC reduces need for external components

17th July 2018
Mick Elliott

The AD5767 12-bit voltage output denseDAC digital-to-analogue converter (DAC) from Analog Devices is now being shipped by Mouser Electronics. Designed to reduce the system footprint for wired telecommunications systems without compromising performance, the 16-channel DAC provides the required discrete components and necessary bias ranges for coherent, fibre-based optical systems from medium- to long-haul implementations.

The DAC delivers a broad range of unipolar or bipolar output voltages from the user-supplied 2.5V reference. Engineers can monitor each of the DAC’s 16 channels using the integrated output voltage multiplexer, and adjust each output from a minimum output voltage of -20V to a maximum output voltage of +14V.

The output buffers on the DAC can also sink or source up to 20mA, and, if needed, the DAC can execute low-frequency dithering functionality, which eliminates the need for external circuitry.

This reduction of external components makes the DAC highly desirable for indium phosphide Mach-Zehnder modulator (InP MZM) biasing applications.

For communications, the AD5767 features a versatile four-wire serial interface that operates at a clock rate of up to 50MHz for write mode and is compatible with a serial peripheral interface (SPI), QSPI, MICROWIRE, and DSP interface standards.

The device comes in a space-saving 4mm × 4mm WLCSP package and 6mm × 6mm LFCSP package. The DAC features a wide operating temperature range of minus 40 degrees to 105 degrees Celsius, and is suited for industrial automation, optical networking, analogue output modules, test and measurement equipment, and data acquisition applications.

It is supported by the full-EVAL-AD5767 evaluation board, which integrates an Analog Devices ADP5071 switching regulator to offer a complete power solution. The evaluation board enables designers to control the AD5767 DAC using the USB port of a Windows-based PC running Analog Device’s Analysis, Control, Evaluation (ACE) evaluation software.

The ACE software provides an intuitive graphical user interface (GUI) to configure modes of operation through the synchronous serial port interface.

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