20-bit and 18-bit D/A converters provide stability and ultra-low noise to increase accuracy of instrumentation equipment
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. The features combine to improve repeatability, reduce system downtime, and lower system maintenance costs.
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 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 –40º C to +125º C.
Availability and Pricing
The AD5790 20-bit D/A converter is available now and packaged in a 24-lead 4-mm × 5-mm LFCSP. The device is priced at $67.50 each per 1,000.
The AD5780 18-bit D/A converter is available now and packaged in a 24-lead 4-mm × 5-mm LFCSP. The device is priced at $19.50 each per 1,000.
The AD5760 16-bit D/A converter is available now and packaged in a 24-lead 4-mm × 5-mm LFCSP. The device is priced at $8.95 each per 1,000.
More information about the AD5790 20-bit D/A converter at
www.analog.com/AD5790
More information about the AD5780 18-bit D/A converter at
www.analog.com/AD5780
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