ADI announces the AD5791 high-accuracy 20-bit DAC, featuring true 1-ppm resolution and accuracy. The AD5791, with its low noise (sub 1 ppm), fast refresh rates (1 us), and extremely low output drift (sub 1 ppm), significantly simplifies the design task, lowers development cost and reduces risk.
In MRI systems, this technology improves image quality, enables precise control of the magnetic gradient in high-field-strength applications, and results in superior image resolution and contrast. The low noise, drift, and linearity performance of the AD5791 maximises operational up-time by eliminating the need to take the MRI system offline for system calibration cycles. The new converter also reduces the necessity for complex calibration algorithms, resulting in lower engineering and system maintenance costs.
The 20-bit AD5791 offers a relative accuracy specification of ±1 LSB max, and operation is guaranteed monotonic with a ±1 LSB DNL max specification. The product delivers 0.025ppm low frequency noise and features 0.05ppm/C output drift. The output can be configured for standard unipolar (+5 V, +10 V) or bipolar (±5 V, ±10 V) output ranges. The AD5791 uses a three-wire serial interface that operates at clock rates up to 50 MHz.
Wolfgang Patelay, Editor Print & Online 