Date: 07/07/2010
Multichannel DAC with dynamic power control from ADI
Analog Devices has unveiled the AD5755 DAC, a multichannel DAC (digital-to-analog converter) with dynamic power control circuitry, ADI's dc-to-dc switching converters and diagnostic features. According to ADI this DAC enables increased system productivity, while simultaneously lowering power use without affecting safety and reliability.
Some of the key features of AD5755 are:
1. AD5755 incorporates four precision 16-bit DACs with programmable voltage or 4-20-mA output drivers, along with dynamic power control.
2. The dynamic power control feature works by continually sensing the load impedance and delivering the required power to the load while minimizing power loss in the rest of the system thus reducing self-heating and temperature elevation.
3. According to ADI this converter supports four times more channels than any other integrated converter, enabling up to four times more terminals at twice the performance in a single analog I/O module and also lowers power consumption by 80 percent and net thermal rise (silicon temperature minus ambient temperature) by 75 percent compared to other control driver technologies.
4. This 16-bit converter offers a full channel spec with a maximum total unadjusted error of 0.05 %, a relative accuracy of ±0.003% max, and does not require system calibration.
5. AD5755 also implements the single chip architecture that includes multiple converters, power management, linear and other functions, increasing MTTF (mean time to failure) and improving reliability. It also includes various diagnostics for real-time fault analysis, including communication, connection, and interface alerts, which simplify the design task and boost operational up-time.
6. The device supports standard industrial voltage and current output ranges and can be used with standard HART (Highway Addressable Remote Transducer) protocol modems.
7. Also integrated on-chip is a 5-ppm/°C internal reference, user-accessible offset and gain registers and a 30-MHz SPI (serial peripheral interface) compatible interface.
"Increased terminal density puts pressure on module size and can result in extra heat generation in industrial systems," said Mike Britchfield, vice president for the Industrial and Instrumentation Group, Analog Devices. "By reducing power consumption and self-heating, the dynamic power control function of the AD5755 meets customer requirements for increased channel density. This allows manufacturers to achieve channel-rich designs without having to increase the form factor of their systems or back-off on other performance parameters."
Availability, Pricing, Complementary Products
The AD5755 is sampling now and works well in conjunction with other ADI's components for industrial applications such as the AD779x and AD7190 ADCs (analog-to-digital converters), AD5421 (loop-powered 4-20-mA DAC), ADuC706x precision analog microcontroller, ADR44x voltage reference and ADUM140x, ADuM540x iCoupler digital isolators.
Product Description Temperature
Range Price Each
Per 1,000 Package
AD5755 16-Bit, V/I Output,
Dynamic Power Control -40° C to +105° C $13.35 64-lead LFCSP
9 mm × 9 mm
AD5755-1 16-Bit, V/I Output, Dynamic Power Control,
HART Connectivity -40° C to +105° C $13.06 64-lead LFCSP
9 mm × 9 mm
AD5757 16-Bit, I Output,
Dynamic Power Control -40° C to +105° C $11.56 64-lead LFCSP
9 mm × 9 mm
For more information visit http://www.analog.com/pr/AD5755