AD7248JP-REEL

Overview

The AD7248JP-REEL is a 12-bit DACPORT digital-to-analog converter manufactured by Analog Devices Inc. It integrates a voltage output amplifier and an internal Zener reference on a monolithic CMOS chip, eliminating the need for external user trims. The device features an (8+4) parallel loading structure, accepting data via two write operations to populate its input latch. Key electrical specifications include a supply voltage range of +10.8 V to +16.5 V for both analog and digital sections, with a typical settling time of 7 µs to within ±1/2 LSB. Relative accuracy grades vary, with the 'B' version offering ±1/2 LSB maximum linearity at 25°C. The component operates within a temperature range of –40°C to +85°C.

Feature Summary

• 12-bit resolution with integrated buffered voltage output and internal 5V buried Zener reference.
• (8+4) parallel interface structure allowing byte-wise data loading into a 12-bit input latch.
• Improved linearity grade with ±1/2 LSB relative accuracy (AD7248AB variant) and ±3/4 LSB (AD7248AA variant).
• Fast interface timing with typical 30 ns data setup time and 7 µs settling time.

Applications

• Microprocessor-compatible systems requiring direct interfacing with 8-bit data buses.
• Industrial control applications utilizing single or dual supply configurations.
• Systems requiring low power consumption with typical 65 mW dissipation in single supply mode.

Procurement Notes

Verify the specific accuracy grade suffix (A or B) required for the application, as linearity specifications differ between ±3/4 LSB and ±1/2 LSB. Confirm that the REEL packaging format aligns with automated assembly requirements. Ensure power supply decoupling components match the datasheet recommendations for the REF OUT pin to maintain reference stability.

Selection Notes

Select the AD7248 series over the AD7245 if an 8-bit wide microprocessor interface is preferred, as the AD7248 utilizes an (8+4) loading structure compared to the AD7245's full 12-bit parallel load. Choose the AB variant for tighter linearity specifications (±1/2 LSB) compared to the AA variant (±3/4 LSB). Verify that the operating temperature range of –40°C to +85°C meets the environmental constraints of the target system.

Part Context

The AD7248A is an enhanced version of the industry-standard AD7248, featuring improved operation from 12 V to 15 V supplies and faster interface times. It belongs to the DACPORT family, which combines precision bipolar circuits with low-power CMOS logic using the LC2MOS process. This integration allows for space-saving designs and increased reliability compared to multichip solutions.

Replacement Considerations

The AD7245A serves as a functional alternative if a full 12-bit parallel interface is acceptable instead of the (8+4) structure. Other members of the AD7248 family, such as AD7248AN or AD7248AR, offer different package options (DIP, SOIC, PLCC) while maintaining identical electrical characteristics.