AD7845KRZ

Overview

The AD7845KRZ is a complete 12-bit CMOS multiplying digital-to-analog converter (MDAC) with an integrated output amplifier, manufactured by Analog Devices Inc. It utilizes the LC2MOS process to combine precision linear components and digital circuitry on a single chip. The device features full 4-quadrant multiplication capability and includes three on-chip application resistors for gain ranging and offset adjustment. It operates with TTL and 5 V CMOS compatible digital inputs and supports parallel data interfacing via standard CS and WR signals. The component is housed in a 24-lead SOIC package.

Feature Summary

• Integrated 12-bit R-2R ladder DAC with on-chip unity-gain output amplifier
• Full 4-quadrant multiplying capability with low digital feedthrough error
• Three internal application resistors (RA, RB, RC) for flexible gain scaling
• TTL and 5 V CMOS compatible digital inputs with latched data architecture

Applications

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

Procurement Notes

Verify the specific suffix 'KRZ' against the manufacturer's ordering guide to confirm the package type and temperature range. The datasheet lists the 'KR' variant as a commercial grade part in a 24-lead SOIC package operating from 0°C to +70°C. Ensure that any additional characters in the suffix do not indicate military processing or hermetic packaging variants not covered in the standard commercial documentation.

Selection Notes

Select the AD7845KRZ when a compact solution requiring both D/A conversion and signal amplification is needed. The integrated amplifier eliminates external components, reducing board space. Verify that the required supply voltage range of ±14.25 V to ±15.75 V aligns with the system design. The 12-bit resolution and 5 µs settling time are suitable for moderate-speed applications such as programmable gain stages or waveform generation.

Part Context

The AD7845 series represents Analog Devices' first industry-standard 4-quadrant multiplying DAC with an on-chip amplifier. The KRZ designation identifies a specific commercial-grade instance within this family, distinguished by its surface-mount SOIC packaging. This model continues the legacy of high-precision analog integration using LC2MOS technology, offering monotonic performance across the specified temperature range without requiring external trimming for basic operation.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.