Analog Devices has introduced a family of octal 8-, 10- and 12-bit buffered voltage-output digital-to-analog converters (DACs) that operate from a single 2.5-V to 5.5-V power supply and consume only 1.4 milliamps (max.) at 3 V. Rail-to-rail outputs provide maximum headroom and dynamic range in low voltage, single supply applications. The 8-bit AD5308, 10-bit AD5318 and 12- bit AD5328 utilize a versatile three-wire serial interface that operates at clock rates up to 30 MHz and is compatible with standard SPI, QSPI, MICROWIRE and DSP interfaces. Integrating eight DACs on one chip, these converters are designed for space-constrained applications in optical networking, automatic test equipment, mobile communications, industrial process control, and portable, battery-powered instruments.
A power-down feature reduces the current consumption to 400 nanoamps at 5 V (120 nanoamps at 3 V). Each of the eight channels of the DAC can be individually powered-down for flexible and incremental power management. The DACs are pin-compatible, allowing engineers to select the correct resolution without having to redesign the circuit board. Data is entered as a 16-bit word consisting of 1 control bit, 3 address bits, and 12 data bits. The unused LSBs are ignored in the lower resolution parts, so the DACs can also be made software-compatible.