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DACs consume 2mA supply current during write operations

Posted: 15 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:digital-to-analog converter? dac? maxim integrated products? max5108? max5109?

These dual and quad buffered, rail-to-rail, 8bit digital-to-analog converters (DACs) from Maxim Integrated Products Inc. tout low power and the I?C interface.

The converters feature a single 2.7V to 5.5V supply range, and consume 200?A supply current during write operations, while the closest competing nonvolatile DAC consumes 3mA, according to Maxim.

These DACs are also the only nonvolatile memory devices with the I?C-interface that accepts data rates up to 400Ksamples/s, the company said. A software-selectable shutdown feature reduces the supply current to 20?A (max), compared to 1mA of shutdown current from similar devices.

The converters power-up with the last command stored in the nonvolatile memory (prior to power-down), and transfer to the DAC registers. This sets the DAC outputs to a predefined value. A mute function independently drives each DAC output to its respective low-side reference voltage. Addressing options allow multiple devices to be connected to the same I?C bus.

Applications for these low-cost, highly accurace converters include digital gain and offset adjustment, programmable attenuators, portable instruments, and power-amp bias control.

Pricing for the MAX5108/MAX5109 and the MAX5115/MAX5116 start at $3.37 and $5.97, respectively (1000-up, FOB USA).

- Bettyann Liotta


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