AD7845JNZ

Overview

The AD7845JNZ is a 12-bit CMOS multiplying digital-to-analog converter (MDAC) with an integrated output amplifier, fabricated on the LC2MOS process. It supports full 4-quadrant multiplication and features three on-chip application resistors for gain ranging and offset adjustment. The device accepts TTL and 5 V CMOS compatible digital inputs via parallel interface. Electrical specifications include a maximum settling time of 5 µs to 0.01% of full-scale range, a typical unity gain small-signal bandwidth of 600 kHz, and a slew rate of 11 V/µs. It operates within a supply voltage range of ±14.25 V to ±15.75 V.

Feature Summary

• Integrated 12-bit MDAC with on-chip output amplifier supporting 4-quadrant multiplication
• Three internal application resistors (RA, RB, RC) for simplified gain ranging and offsetting
• TTL and 5 V CMOS compatible digital inputs with standard CS and WR control signals
• Low power consumption with IDD max 6 mA and ISS max 4 mA

Applications

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

Procurement Notes

Verify the package designation associated with the 'NZ' suffix against official Analog Devices documentation to confirm physical dimensions and pinout compatibility. Ensure that the specific temperature grade and accuracy class required for the application match the ordering guide specifications provided in the datasheet.

Selection Notes

Select this component when a complete 12-bit solution with an integrated buffer is required to minimize external component count. The presence of on-chip application resistors facilitates easy gain scaling without additional external parts. Verify that the system power supplies fall within the ±14.25 V to ±15.75 V range and that the digital logic levels are compatible with TTL or 5 V CMOS standards.

Part Context

The AD7845 is part of the AD7845 series of multiplying DACs from Analog Devices. It is distinguished by being the industry's first 4-quadrant multiplying DAC with an on-chip amplifier. The series includes variants with different temperature ranges and accuracy grades, housed in DIP, SOIC, PLCC, and LCC packages.

Replacement Considerations

Direct replacements within the same family include AD7845JRZ (SOIC-24), AD7845JPZ (PLCC-28), and AD7845KN (DIP-24). When substituting, verify that the package type matches the PCB footprint and that the accuracy grade meets the design requirements.