AD7849AR

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The AD7849AR is a monolithic CMOS, 8-bit voltage digital-to-analog converter (DAC). It is designed to achieve excellent linearity and AC performance with an ease of use that is unattainable with conventional approach of potential divider, ladder building techniques. The output accuracy of the device is superior to that of conventional devices with similar resolution. The AD7849AR is a single 8-bit DAC with a mirror-byte control input. The device is capable of providing a full scale output range, while dissipating only nominal supply currents.

Application Field

The AD7849AR is ideal for precision data acquisition and laboratory equipment such as oscilloscopes, current source and general purpose signal generator. The successful implementation of the device requires a minimum number of external components, such as a reference voltage source, a sample/hold circuit, and several bypass capacitors. It has applications in processes such as thermography and liquid level sensing, communications systems, and threshhold level detection and pulse width modulation amplifier circuits.

Working Principle

The AD7849AR utilizes the R/2R resistor densities to achieve the full-scale phase differential matching of its 8-bit digital-to-analog converter. The output will accurately set the desired reference voltage with a resolution of 0.5 mV/LSB. Although this resolution is lower than that of some other CMOS Digital-to-Analog converters, the non-linearity is significantly improved. No external reference is needed and the device is self-calibrating, making it particularly suitable for applications that would benefit from one. An onboard sample-and-hold amplifier retains the reference voltage and allows the internal DAC to be multiplexed without distortion.

The AD7849AR provides an input logic voltage range of ± 0.3 V with a power-on reset feature, which converts all analog outputs to a fixed value. The device is powered from a single ±5 V supply and the power consumption is less than 400 μA, making it ideal for remote control applications. In order to maximize the accuracy and minimize the effects of transients on the analog output voltage, the AD7849AR also features an internal reference voltage stabilization loop. This reduces reference voltage-induced errors and allows the device to be operated in an industrial temperature range of -40 to +85 degrees Celsius.

The AD7849AR is designed to provide excellent linearity, monotonicity and power supply noise rejection. The input and output of the device are buffered with TTL-compatible differential amplifiers. All digital inputs feature Schmitt triggers to ensure reliable switching of inputs at slow transitioning digitaldata levels.The ESD protectors used in the device are compliant with both IEC61000-4- 2 and Human Body Model (HBM).

Conclusion

The AD7849AR is an 8-bit monolithic CMOS low voltage voltage digital-to-analog converter. Its features, such as its superior linearity and AC performance, power supply noise rejection and low power consumption, make it ideal for precision data acquisition and laboratory equipment, communications systems, and threshhold level detection and pulse width modulation amplifier circuits. Additionally, the device is also self-calibrating, requires a minimum number of external components, and is protected from ESD failures.

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