AD7247ABNZ

Overview

The AD7247ABNZ is a dual 12-bit voltage-output digital-to-analog converter (DAC) from the DACPORT family, manufactured by Analog Devices. It integrates two independent 12-bit CMOS DACs with on-chip output amplifiers and a Zener voltage reference on a single monolithic LC2MOS chip. The device features a parallel loading structure accepting 12-bit data via separate Chip Select inputs for each channel and a common Write input. It supports operation from single (+12 V to +15 V) or dual supplies (±12 V to ±15 V). Key electrical specifications include a relative accuracy of ±1/2 LSB max, a settling time of 8 µs max, and a typical power dissipation of 165 mW in single-supply mode. The component is housed in a 24-pin plastic DIP package.

Feature Summary

• Dual 12-bit resolution with integrated output amplifiers and internal 5 V reference
• Parallel interface with individual Chip Select inputs for independent DAC control
• Supports unipolar (0-5 V, 0-10 V) and bipolar (±5 V) output ranges via ROFS configuration
• LC2MOS fabrication process ensuring low power consumption and high reliability

Applications

• Industrial process control systems requiring precise analog signal generation
• Microprocessor-based instrumentation and data acquisition systems
• Programmable power supply designs
• Waveform generation circuits

Procurement Notes

Verify the specific suffix 'B' indicates tighter power supply tolerance (±5%) compared to the 'A' version (±10%). Confirm the 'N' suffix corresponds to the 24-pin Plastic DIP package. Ensure compatibility with existing PCB footprints for through-hole mounting. Check for RoHS compliance status as manufacturing processes may evolve. Validate that the operating temperature range meets system requirements for industrial environments.

Selection Notes

Select the AD7247ABNZ when a dual-channel solution is required to save board space compared to discrete multi-chip designs. Choose this part over the AD7237A if a direct 12-bit parallel interface is preferred over an 8-bit double-buffered structure. Consider the improved interface speed (30 ns setup time) for compatibility with modern microprocessors. Ensure the application can accommodate the required ±12 V to ±15 V or +12 V to +15 V supply rails.

Part Context

The AD7247ABNZ is an enhanced version of the industry-standard AD7247. Improvements include operation from 12 V supplies, faster interface times, and better reference variations with VDD. It belongs to the DACPORT family, which combines precision bipolar circuits with low-power CMOS logic. The 'B' grade offers improved power supply tolerance compared to the 'A' grade, while maintaining the same pinout and functional architecture.

Replacement Considerations

The AD7247AN serves as a lower-tolerance alternative. The AD7237ABNZ is functionally similar but uses an 8-bit double-buffered interface rather than a direct 12-bit parallel load. The AD7247ARZ provides the same functionality in a surface-mount SOIC package.