The MAX5138/MAX5139 offer better accuracy, higher integration, and a smaller package than competitive devices. The power-down feature reduces power consumption to just 200nA. An integrated voltage reference features a temperature coefficient of 10ppm/degree Celsius, while the internal buffer provides improved load regulation and transition-glitch suppression for the DAC output. A pin-programmable, zero/midscale DAC output ensures that the output powers up to the desired state, even during a loss-of-power event. This output provides additional safety for applications that drive valves or other transducers that need to be off during power-up.
These precision DACs accept a 3-wire SPI(TM)-/QSPI(TM)-/MICROWIRE(TM)-/DSP-compatible serial interface, which saves board space and reduces the complexity of optically isolated and transformer-isolated applications. To reduce the number of optocouplers in isolated applications, the serial interface features a READY output for easy daisy-chaining of multiple MAX5138/MAX5139 devices and/or other compatible devices.
The MAX5138/MAX5139 are also software compatible with the MAX5134-MAX5137 family of quad and dual, 16- and 12-bit DACs. Prices start at $3.39 for the MAX5138, and $1.60 for the MAX5139 (1000-up, FOB USA). Samples and evaluation kits are available.