AD7248JNZ

Overview

The AD7248JNZ is a 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 an 8-bit-wide bus structure, requiring two write operations to load the full 12-bit word. It operates from supply voltages ranging from +12 V to +15 V for VDD and 0 V to -15 V for VSS. Key electrical parameters include a maximum settling time of 10 µs, ±1 LSB relative accuracy, and ±1 LSB differential nonlinearity. The component is housed in a 20-lead Plastic Dual In-Line Package (PDIP).

Feature Summary

• Integrated 12-bit DAC with buffered voltage output and internal 5 V reference.
• 8-bit parallel data interface with double-buffered logic for microprocessor compatibility.
• ±1 LSB linearity grade with guaranteed monotonicity over temperature.
• Single or dual supply operation with low power consumption (65 mW typical).

Applications

• Industrial process control systems requiring precise analog signal generation.
• Portable instrumentation utilizing single-supply configurations.
• Microprocessor-based data acquisition systems needing direct interfacing.

Procurement Notes

Verify the package type matches the required footprint, as the JNZ suffix denotes a 20-lead PDIP variant. Confirm that the operating environment falls within the specified commercial temperature range of –40°C to +85°C. Ensure power supply rails adhere to the +12 V to +15 V specification for optimal performance. Check for RoHS3 compliance status if environmental regulations apply to the assembly process.

Selection Notes

Select the AD7248JNZ when an 8-bit wide data bus interface is preferred over a 12-bit parallel input. This model is suitable for applications requiring a single-chip solution with integrated reference and amplifier, eliminating external component count. Consider the AD7245A variant if a full 12-bit parallel interface is available and desired. Evaluate the 10 µs settling time against system speed requirements for dynamic signal updates.

Part Context

The AD7248JNZ belongs to the enhanced AD7245A/AD7248A series, which improves upon the industry-standard AD7245/AD7248 models. These enhancements include extended supply voltage ranges, faster interface times, and improved linearity grades. The device utilizes LC2MOS technology, combining precision bipolar circuits with low-power CMOS logic for high reliability and space efficiency compared to multi-chip designs.

Replacement Considerations

The AD7245A is a functional alternative within the same datasheet but requires a 12-bit parallel interface rather than an 8-bit bus. Other members of the DACPORT family may offer different pin counts or interface structures; verify pin compatibility and latch timing specifications before substitution.