AD7248AAPZ

Overview

The AD7248AAPZ 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 an 8-bit parallel data interface with double-buffered logic, requiring two write cycles to load the full 12-bit word. It operates from supply voltages ranging from +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. Key performance metrics include a typical settling time of 7 µs, ±1/2 LSB relative accuracy in the AB grade, and low power consumption of approximately 65 mW in single-supply mode. The component is housed in a 20-lead Plastic Leaded Chip Carrier (PLCC) package.

Feature Summary

• Integrated 12-bit DAC with buffered voltage output and internal 5V reference
• Parallel interface structure: 8-bit data bus loaded via CSMSB and CSLSB signals
• Extended temperature range operation from -40°C to +85°C
• High speed interface with typical 30 ns data setup time

Applications

• Microprocessor-controlled analog signal generation
• Industrial process control systems requiring precise voltage outputs
• Test and measurement equipment needing stable DAC references
• Automated calibration systems utilizing the CLR pin for zero override

Procurement Notes

Verify the specific suffix 'P' corresponds to the PLCC-20 package when sourcing replacements. Confirm that the 'A' or 'B' designation matches the required linearity grade, as the datasheet specifies ±3/4 LSB for AA variants and ±1/2 LSB for AB variants. Ensure supply voltage rails are within the specified ±10% tolerance of 12 V to 15 V for optimal performance. Check for ESD sensitivity precautions during handling and installation.

Selection Notes

Select the AD7248AAPZ over the AD7245A variant if the system utilizes an 8-bit wide microprocessor data bus, as the AD7248A simplifies interfacing by accepting right-justified data in two writes. Choose the 'B' grade version if tighter linearity specifications (±1/2 LSB) are critical for the application. Consider the PLCC package only if surface mount assembly with gull-wing leads is preferred over DIP or SOIC options. Verify that the dual-supply configuration is necessary for bipolar output ranges or improved sink capability.

Part Context

The AD7248A is an enhanced successor to the industry-standard AD7248, featuring improved interface speeds and extended temperature ranges. It belongs to the LC2MOS DACPORT family, which combines precision bipolar circuits with low-power CMOS logic. This integration reduces board space and increases reliability compared to multichip designs. The AD7248A specifically targets applications requiring direct interfacing with modern microprocessors through its fast parallel loading structure.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.