AD7245AARZ

Overview

The AD7245AARZ is a monolithic 12-bit voltage output digital-to-analog converter (DAC) from Analog Devices, part of the DACPORT family. It integrates an output amplifier and a buried Zener voltage reference on a single CMOS chip. The device features a parallel data interface with double-buffered logic, accepting 12-bit data loaded via Chip Select (CS) and Write (WR) signals. Key specifications include a typical settling time of 7 µs to within ±1/2 LSB, a relative accuracy grade of ±1/2 LSB for the 'A' variant, and operation from dual supplies ranging from ±10.8 V to ±16.5 V. It is housed in a 24-lead SOIC package.

Feature Summary

• Integrated 12-bit R-2R DAC with buffered voltage output amplifier and internal 5 V reference.
• Parallel interface with double-buffered input and DAC latches; includes asynchronous CLR pin for power-on reset.
• High linearity grade: ±1/2 LSB maximum relative accuracy at 25°C.
• Fast interface timing with typical 30 ns data setup time and 7 µs settling time.

Applications

• Industrial process control systems requiring precise analog signal generation.
• Programmable gain amplifiers and variable voltage references.
• Waveform generation and test equipment interfaces.
• Microprocessor-based systems needing direct parallel DAC interfacing.

Procurement Notes

Verify the specific suffix 'ARZ' corresponds to the 24-lead SOIC plastic package and RoHS compliance status as defined in the manufacturer's ordering guide. Confirm that the 'A' designation indicates the ±1/2 LSB linearity grade rather than the standard ±3/4 LSB grade. Ensure supply voltages are maintained within the specified ±10.8 V to ±16.5 V range for optimal performance.

Selection Notes

Select the AD7245AARZ when a single-chip solution with integrated reference and amplifier is required for 12-bit resolution. Choose this model over the AD7248A if an 8+4 bit parallel loading structure is preferred over an 8-bit wide bus interface. Consider the extended temperature range (-40°C to +85°C) and the specific ±1/2 LSB accuracy grade for high-precision applications.

Part Context

The AD7245A is an enhanced version of the industry-standard AD7245, offering improved specifications such as operation from 12 V to 15 V supplies, faster interface times, and better full-scale variation with supply voltage changes. It belongs to the DACPORT family, which combines precision bipolar circuits with low-power CMOS logic in an LC2MOS process.

Replacement Considerations

The AD7245ABRZ is available with a tighter ±1/2 LSB accuracy grade. For military specifications, the AD7245ATE3 or parts processed to MIL-STD-883 Class B may be considered. The AD7248A series offers similar functionality but uses an 8-bit wide data bus interface instead of the 12-bit parallel structure.