AD7245ABRZ

Overview

The AD7245ABRZ is a monolithic 12-bit voltage output digital-to-analog converter (DAC) from Analog Devices, featuring an integrated output amplifier and a buried Zener voltage reference. It operates on single or dual supplies ranging from +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. The device utilizes a parallel interface with double-buffered logic, accepting 12-bit data via CS, WR, and LDAC signals. Key performance metrics include a typical settling time of 7 µs to within ±1/2 LSB, a relative accuracy grade of ±1/2 LSB at 25°C, and low power consumption of 65 mW in single-supply mode. It is housed in a 24-lead SOIC package.

Feature Summary

• Integrated 12-bit DAC with buffered voltage output and internal 5 V reference
• ±1/2 LSB linearity grade with guaranteed monotonicity
• Fast parallel interface with 30 ns typical data setup time
• Extended commercial temperature range (-40°C to +85°C)

Applications

• Microprocessor-controlled instrumentation systems
• Programmable gain amplifiers and variable voltage sources
• Industrial process control loops requiring precise analog outputs

Procurement Notes

Verify the specific suffix 'BRZ' corresponds to the 24-lead SOIC plastic package with lead-free termination as per the manufacturer's ordering guide. Confirm that the required linearity grade matches the 'B' designation (±1/2 LSB). Ensure supply voltages remain within the specified ±10% tolerance of the nominal 12 V to 15 V range for optimal performance.

Selection Notes

Select the AD7245ABRZ when a single-channel 12-bit DAC with high speed and integrated buffering is required. Compare against the AD7248A if an 8-bit wide parallel interface is preferred over the 12-bit wide bus. Consider the AD7245AAQ for ceramic DIP packaging or the AD7245ATE for extended industrial temperature ranges (-55°C to +125°C) if environmental conditions exceed the commercial grade limits.

Part Context

The AD7245ABRZ belongs to the enhanced AD7245A/AD7248A DACPORT family, succeeding the original industry-standard AD7245/AD7248. This generation offers improved specifications including operation from lower supply voltages (12 V), faster interface times, and tighter linearity grades. It is fabricated using linear compatible CMOS (LC2MOS) technology, combining precision bipolar circuits with low-power CMOS logic for high reliability and space efficiency.

Replacement Considerations

The AD7245AAQ serves as a pin-compatible alternative in a 24-lead Cerdip package. For extended temperature applications, the AD7245ATE provides the same electrical characteristics in a 28-lead LCCC package. The AD7248ABRZ is functionally similar but uses an 8-bit parallel interface structure.