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Analog Devices Introduces High-Voltage Digital-To-Analog Converter For Industrial Applications

Analog Devices » AD5764

Quad 16-bit digital-to-analog data converter leverages ADI's iCMOSTM manufacturing process to deliver three times more accuracy in 50 percent less board space.

November 9, 2004 - Analog Devices, Inc. introduced a new product that features four high-accuracy 16-bit digital-to-analog converters (DAC) with +/- 10 volt (V) tolerances and extensive on-chip signal chain integration. Using technological advancements enabled by ADI's iCMOSTM industrial process technology, the AD5764 achieves a three-fold improvement in accuracy over previously available high-voltage DACs while using 50 percent less board space. This quad, serial input, bipolar voltage output DAC features 16-bit resolution, 1 LSB INL, 1 LSB DNL, and with gain and offset calibration to less than 1 mV. In addition, the device integrates features essential to reducing design time and overall system cost, including an on-chip 3 ppm per degree C reference (typical), reference buffers, low headroom/wide swing amplifier, temperature sensor, power-on reset, power on/off output control and I/O lines. This integrated functionality is housed in 7mm x 7mm packaging.


About the AD5764 - Improving System Accuracy
Featuring an extended programmable output range of up to +/- 10 V, the AD5764 allows designers to minimize output headroom requirements and enhance system calibration. Local ground offset adjustment overcomes system error due to ground impedance errors between the DAC and the load. The output voltage can be controlled during power-up and brownout conditions by clamping the VOUT pin to 0 V via a low impedance path. The device also provides an on-chip detector output which can be used as an interrupt or to control other parts of the system during a brownout condition. The amplifier output control can be invoked externally, allowing the output to be controlled by system monitors or supervisors.

Other features include a digital I/O port that can be used to control output signals to multiplexers or to control calibration circuitry elsewhere in the system. For example, the logic signals from limit switches can be read back via the digital interface. The device includes an analog temperature sensor which allows relative temperature measurement- for example, a temperature indicator that can be used to invoke a system calibration. The device also provides short-circuit protection, eliminating the requirement for external short-circuit current.

Pricing and Availability
The quad 16-bit AD5764 DAC is now sampling. The device is available in small and thin 32-lead TQFP (Thin Quad Flat Package) packaging, measuring 7mm x 7mm. Pricing is $27.00 per unit in 1,000-piece quantities.

About Analog Devices' iCMOS Industrial Process Technology
iCMOS (industrial-CMOS) is a modular manufacturing process combining high-voltage with submicron CMOS (complementary metal-oxide semiconductor) and complementary bipolar technologies. It enables the development of a wide range of high-performance analog ICs capable of 30-V operation in a small footprint, which no other generation of high-voltage parts has been able to achieve. Unlike analog ICs using conventional CMOS processes, iCMOS components can tolerate high supply voltages, while providing increased performance, dramatically lower power consumption, and reduced package size.

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