AD7245JNZ

Overview

The AD7245JNZ is a monolithic 12-bit CMOS digital-to-analog converter (DAC) from the DACPORT family, manufactured by Analog Devices. It integrates a voltage output amplifier and an internal buried Zener reference on a single chip. The device features parallel data loading with double-buffered interface logic, accepting 12-bit data via DB0–DB11. Key electrical specifications include a settling time of 7 µs to within ±1/2 LSB, a relative accuracy of ±1/2 LSB for the AB grade, and operation from dual supplies ranging from ±10.8 V to ±16.5 V. It is housed in a 24-lead Plastic DIP package.

Feature Summary

• Integrated 12-bit R-2R voltage mode DAC with buffered output amplifier and internal 5 V reference.
• Double-buffered parallel interface with asynchronous LDAC control for data updates.
• High linearity performance with ±1/2 LSB relative accuracy and guaranteed monotonicity.
• Flexible power supply operation supporting both single (+15 V) and dual (±15 V) configurations.

Applications

• Industrial process control systems requiring precise analog signal generation.
• Portable instrumentation and battery-powered devices utilizing single-supply operation.
• Microprocessor-based systems needing direct interfacing with high-speed data latches.
• Calibration equipment requiring stable, low-drift voltage references.

Procurement Notes

Verify the specific suffix 'JNZ' against the manufacturer's current ordering guide to confirm package type and temperature range availability. Ensure that the required linearity grade (AB vs AA) matches the application needs, as the JNZ designation typically corresponds to the standard plastic DIP package. Confirm RoHS compliance status if environmental regulations apply to the end product.

Selection Notes

Select the AD7245JNZ when a complete 12-bit voltage-output DAC with integrated reference is required without external trimming. Choose this component over the AD7248A if the system utilizes a 12-bit wide data bus rather than an 8-bit bus. Consider the 7 µs settling time and ±1/2 LSB accuracy for applications demanding moderate speed and high precision. Ensure the power supply rails align with the specified ±10.8 V to ±16.5 V range for optimal performance.

Part Context

The AD7245JNZ belongs to the enhanced AD7245A/AD7248A series, which improves upon earlier industry-standard models by offering extended temperature ranges and faster interface times. It is part of Analog Devices' DACPORT family, designed to replace multi-chip solutions with a single-chip implementation. The 'JNZ' suffix specifically denotes the 24-lead Plastic DIP package variant available in commercial temperature grades.

Replacement Considerations

The AD7245ANZ serves as a direct pin-compatible replacement with slightly different accuracy grades (±3/4 LSB). For systems using an 8-bit microprocessor bus, the AD7248JNZ offers identical functionality but with an 8+4 bit input structure. Verify that any substitute maintains the same 24-lead DIP footprint and supply voltage requirements.