Analog Devices has introduced D/A converters that provide high accuracy and ultra-low noise, simplifying the design of precision instrumentation and analytical equipment. The new high-accuracy D/A converters incorporate integrated precision reference conditioning circuitry, making them system ready and providing a 60 percent reduction in board space compared to competing standalone data converters. The high linearity and low noise of the AD5790 and AD5780 D/A converters reduce the need to calibrate systems for nonlinearity or to time-average multiple measurements. The high stability and low drift of the converters over time and temperature reduce the need to compensate systems for aging and temperature effects.
Precision analog system design often entails the complex engineering challenges of combining a precision D/A converter with a significant amount of signal conditioning and support circuitry to eliminate nonlinearity, minimize thermoelectric and noise sources, and reduce offset errors. The integrated precision reference buffers incorporated into the AD5790 and AD5780 D/A converters significantly simplify this development effort for high-end systems, simultaneously reducing performance risk and design cycles.
The AD5790 D/A converter offers ±2-LSB accuracy at 20-bit, while the AD5780 features ±1 LSB accuracy at 18-bit over temperature. Guaranteed monotonic, the devices specify –1-LSB max DNL. The AD5790 and AD5780 D/A converters feature 1.1-µV peak-to-peak, low-frequency output noise, 9-nV/rt-Hz noise spectral density and less than 0.05-ppm/°C temperature drift. The output can be configured for standard unipolar (+5 V, +10 V) or bipolar (±5 V, ±10 V) output ranges. The devices, which use a versatile three-wire serial interface that operates at clock rates up to 50 MHz, feature a 2.5-µs analog update rate. The AD5790 and AD5780 D/A converters are fully specified over the extended temperature range of –40 to +125°C.
