AD7248AAP-REEL

Overview

The AD7248AAP-REEL 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-wide parallel data bus with a double-buffered interface structure designed for microprocessor compatibility. Key specifications include a typical settling time of 7 µs to within ±1/2 LSB, relative accuracy grades of ±3/4 LSB or ±1/2 LSB, and operation from dual supplies ranging from +10.8 V to +16.5 V. The component supports unipolar (0 V to 5 V, 0 V to 10 V) and bipolar (±5 V) output ranges.

Feature Summary

• Integrated 12-bit DAC with on-chip output amplifier and low-noise buried Zener reference.
• Double-buffered parallel interface with 8-bit data bus and separate MSB/LSB chip selects.
• Extended temperature range operation from –40°C to +85°C.
• High-speed interface with typical 30 ns data setup time.

Applications

• Industrial process control systems requiring precise analog signal generation.
• Programmable power supplies and instrumentation amplifiers.
• Waveform generation in test and measurement equipment.

Procurement Notes

Verify the specific linearity grade (A for ±3/4 LSB or B for ±1/2 LSB) required for the application, as this affects performance specifications. Confirm that the REEL suffix indicates tape-and-reel packaging suitable for automated assembly processes. Ensure supply voltages remain within the specified +10.8 V to +16.5 V range to maintain guaranteed monotonicity and accuracy.

Selection Notes

Select the AD7248AAP-REEL when an 8-bit parallel interface is preferred over the 12-bit direct load of the AD7245A variant. Choose the 'A' or 'B' suffix based on the required relative accuracy tolerance at room temperature and across the operating temperature range. Ensure the design accommodates the 20-lead plastic leaded chip carrier package dimensions and thermal dissipation requirements.

Part Context

This component is an enhanced version of the industry-standard AD7248, offering improved linearity, faster interface times, and extended temperature capabilities. It belongs to the DACPORT series, which combines precision bipolar circuits with low-power CMOS logic. The AD7248A variant specifically utilizes an 8-bit data bus architecture, distinguishing it from the 12-bit parallel input of the AD7245A.

Replacement Considerations

The AD7248ABNZ serves as a pin-compatible alternative in a 20-lead PDIP package. For surface-mount applications requiring different packaging, the AD7248AARZ is available in a 20-lead SOIC format. Verify that any substitute maintains the same relative accuracy grade and interface timing requirements.