Low Power, 16-bit Accurate Delta-Sigma DAC Allows Single Isolator Data Transmission
The low-power DAC161P997 provides system designers an exceptional balance of accuracy, ease of use, performance and system cost. Its 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 uA of supply current. The DAC161P997’s loop drive interfaces to a highway addressable remote transducer (HART) modulator, allowing injection of FSK-modulated digital data into the 4-to-20 mA current loop. The DAC operates over the -40 degrees C to 125 degrees C extended industrial temperature range.
Key Features and Benefits of the DAC161P997
Single-wire interface: enables higher system accuracy compared to discrete PWM implementations, and lower system cost compared to 4-wire SPI solution
Low power operation: 190 uA enables total system power consumption below 30 mW or 3.5 mA
User programmable start up conditions and data rate auto detect: allows system configuration for trade-off between update-rate vs. power consumption
Error detection and reporting: multiple error conditions detected automatically, providing higher system reliability
The DAC161P997 complements National’s innovative Sensor AFE Family in smart transmitter designs, including a wide variety of gas, temperature and pressure sensor applications.