AD7845KPZ

Overview

The AD7845KPZ is a 12-bit CMOS multiplying digital-to-analog converter (MDAC) featuring an integrated output amplifier. Fabricated on the LC2MOS process, it supports full 4-quadrant multiplication with guaranteed monotonicity across its operating temperature range of 0°C to +70°C. The device utilizes a parallel interface and operates with dual supplies ranging from ±14.25 V to ±15.75 V. It includes three on-chip application resistors for gain ranging and offset adjustment. Key electrical parameters include a settling time of 5 µs to 0.01% and a maximum relative accuracy error of -1/2 LSB at +25°C.

Feature Summary

• Integrated output amplifier enabling full 4-quadrant multiplication
• Three on-chip application resistors (RA, RB, RC) for gain ranging and offsetting
• Guaranteed monotonic operation over the specified temperature range
• TTL and 5 V CMOS compatible digital inputs

Applications

• Automatic Test Equipment
• Programmable Power Supplies
• Digital Attenuators
• Programmable Gain Amplifiers
• Digital-to-4–20 mA Converters

Procurement Notes

Verify the specific suffix KPZ against the manufacturer's ordering guide to confirm the package type and temperature grade. Ensure supply chain documentation matches the required reliability standards for commercial applications. Cross-reference pinout configurations for the specific package variant to ensure correct PCB footprint alignment.

Selection Notes

Select the AD7845KPZ when a 12-bit resolution with an integrated buffer is required for space-constrained designs. The K version offers tighter accuracy specifications (-1/2 LSB) compared to the J version (-1 LSB). Ensure the system power supplies fall within the ±14.25 V to ±15.75 V range to maintain specified performance metrics.

Part Context

The AD7845 series represents Analog Devices' first 4-quadrant multiplying DAC with an on-chip amplifier. It is designed to reduce component count by integrating precision linear components and digital circuitry on a single LC2MOS chip. The KPZ designation identifies a specific commercial-grade variant within this family, distinguished by its accuracy class and package configuration.

Replacement Considerations

Direct replacements within the same accuracy class include the AD7845JPZ or AD7845KRZ. Verify that substitute parts match the required package outline and thermal characteristics. Alternative packages such as DIP or SOIC may require schematic adjustments for pin compatibility.