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20-bit D/A converters

The 20-bit AD5790 and 18-bit AD5780 D/A converters provide stability and ultra-low noise needed to increase accuracy of instrumentation equipment: they incorporate integrated precision reference conditioning circuitry, making them system-ready and providing a 60% reduction in board space compared to standalone data converters. The AD5790 D/A converter has ±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-μsec analogue update rate. They are fully specified over the extended temperature range of –40º C to +125º C and cost $19.50 (18-bit) or $67.50 (20-bit) (1000).

Analog Devices www.analog.com/AD5790 or www.analog.com/AD5780