AD7245ABNZ

Overview

The AD7245ABNZ is a monolithic 12-bit voltage-output digital-to-analog converter (DAC) from the DACPORT family, manufactured by Analog Devices Inc. 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 via dedicated pins. Key electrical specifications include a settling time of 7 µs to within ±1/2 LSB, a relative accuracy grade of ±1/2 LSB, and operation with supply voltages ranging from +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. It is housed in a 24-lead Plastic DIP package.

Feature Summary

• Integrated 12-bit R-2R DAC with buffered voltage output and internal 5V reference
• Parallel interface with double-buffered input and DAC latches for high-speed microprocessor compatibility
• High linearity grade with ±1/2 LSB maximum relative accuracy over temperature range
• Flexible power supply operation supporting single (+12V to +15V) or dual (±12V to ±15V) configurations

Applications

• Industrial process control systems requiring precise analog signal generation
• Programmable power supplies and battery testers
• Waveform generation and function generators
• Calibration equipment and test instruments

Procurement Notes

Verify the specific suffix 'NZ' corresponds to the lead-free, RoHS-compliant version of the standard AD7245ABN package. Confirm that the required performance grade matches the ±1/2 LSB specification, as lower grades exist. Ensure the procurement channel provides genuine Analog Devices components to avoid counterfeit risks associated with legacy industrial ICs.

Selection Notes

Select the AD7245ABNZ when a 12-bit resolution with high accuracy (±1/2 LSB) and fast settling time (7 µs) is required. Choose this part over the AD7248A if a full 12-bit parallel data bus is preferred over an 8-bit bus with nibble loading. Ensure the application supports the required ±10.8 V to ±16.5 V supply rails or can be adapted to the single-supply configuration with appropriate pin strapping.

Part Context

The AD7245A is an enhanced version of the industry-standard AD7245, offering improved linearity, faster interface times, and extended temperature ranges. It belongs to the DACPORT family, which combines precision bipolar circuits with low-power CMOS logic. The ABNZ designation indicates the commercial temperature grade (-40°C to +85°C), ±1/2 LSB accuracy, and Plastic DIP packaging.

Replacement Considerations

The AD7245ABN is the non-RoHS equivalent. For pin-compatible alternatives with similar specifications, consider the AD7245AAZ (±3/4 LSB accuracy) or the AD7248ABNZ (8-bit parallel interface). Verify that any substitute maintains the same 24-pin DIP footprint and supply voltage requirements.