Analogue, Mixed Signal, LSI


16-bit DAC

28 September 2011 Analogue, Mixed Signal, LSI

National Semiconductor has introduced a 16-bit digital-to-analog converter (DAC) featuring a single-wire interface and 4–20 mA current loop drive that simplifies the design of smart transmitters used in industrial two-wire sensor systems.

The highly integrated DAC161P997 reduces component count and cost in factory and building automation control systems by enabling the use of a single isolation component to cross the isolation boundary. For sensing and detecting applications where galvanic isolation is not required, the device interfaces directly to a microcontroller.

The low-power DAC161P997’s delta-sigma DAC offers 16-bit accuracy with a minimal temperature coefficient of 29 ppm and long-term output current drift of 90 ppm, while consuming less than 190 μA of supply current. The chip’s loop drive interfaces to a highway addressable remote transducer (HART) modulator, allowing injection of FSK-modulated digital data into the 4–20 mA current loop. The DAC operates over the -40°C to 105°C extended industrial temperature range.

User programmable startup conditions and data rate auto detect allow system configuration for trade-off between update rate and power consumption. High system reliability is provided by the automatic detection and reporting of multiple error conditions.

For more information contact Stuart Hanford, Arrow Altech Distribution, +27 (0)11 923 9600, shanford@arrow.altech.co.za, www.arrow.altech.co.za



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