AD7245AANZ

Overview

The AD7245AANZ is a 12-bit CMOS digital-to-analog converter (DAC) from the DACPORT family, manufactured by Analog Devices Inc. It integrates a voltage output amplifier and an internal Zener voltage reference on a single monolithic chip. The device operates with supply voltages ranging from +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. Key electrical specifications include a typical settling time of 7 µs, ±1 LSB maximum integral nonlinearity (INL), and ±1 LSB maximum differential nonlinearity (DNL). It features a parallel data interface with double-buffered logic and is housed in a 24-lead Plastic Dual In-Line Package (PDIP).

Feature Summary

• Integrated 12-bit R-2R ladder DAC with buffered voltage output amplifier and internal 5 V buried Zener reference.
• Parallel loading structure accepting 12-bit data via CS, WR, LDAC, and CLR control signals.
• Extended linearity grade of ±1/2 LSB relative accuracy at 25°C and ±1 LSB over the full temperature range.
• Supports unipolar (0 V to 5 V, 0 V to 10 V) and bipolar (-5 V to +5 V) output ranges via pin-strappable resistor connections.

Applications

• Industrial process control systems requiring precise analog signal generation.
• Portable instrumentation and test equipment needing low power consumption.
• Microprocessor-based systems requiring direct interfacing with high-speed data latches.
• Medical ultrasound equipment and radar systems utilizing DACPORT technology.

Procurement Notes

Verify the package option 'N' corresponds to the 24-lead Plastic DIP (PDIP) form factor as specified in the ordering guide. Confirm the suffix 'ANZ' indicates lead-free compliance and RoHS3 status. Ensure the operating temperature range matches the commercial grade specification of -40°C to +85°C. Check that the specific lot revision aligns with current manufacturing standards provided by Analog Devices.

Selection Notes

Select the AD7245AANZ when a 12-bit resolution with integrated reference and amplifier is required in a through-hole package. Choose this model over the AD7248A if an 8+4 bit parallel interface is preferred over an 8-bit bus with two write cycles. Consider the extended linearity grade (+1/2 LSB) if tighter accuracy is needed compared to the standard ±3/4 LSB version. Ensure supply voltages remain within the +10.8 V to +16.5 V range for optimal performance.

Part Context

The AD7245AANZ belongs to the enhanced DACPORT series, improving upon the original AD7245 by offering operation from 12 V to 15 V supplies, faster interface times, and improved linearity grades. It is fabricated using LC2MOS technology, combining precision bipolar circuits with low-power CMOS logic. This component serves as a complete solution for applications previously requiring multiple discrete chips, reducing board space and increasing reliability.

Replacement Considerations

The AD7245ABN is a compatible alternative offering higher linearity accuracy of ±1/2 LSB at 25°C. For surface mount requirements, the AD7245AAR (SOIC) or AD7245AAP (PLCC) provide equivalent functionality in different packages. The legacy AD7245 may be used if lower speed and standard linearity are acceptable, though it lacks the enhanced supply range and interface improvements.