AD7945ARSZ-BREEL

Overview

The AD7945ARSZ-BREEL is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, featuring a parallel interface and housed in a 20-lead SSOP package. It operates on a single +3.3 V to +5.5 V supply with typical power consumption of 5 mW. The device guarantees ±0.5 LSB integral nonlinearity (INL) and differential nonlinearity (DNL), ensuring monotonicity across the temperature range of -40°C to +85°C. Key electrical parameters include a maximum gain error of ±2 LSBs, an output leakage current of 10 nA at +25°C, and a write pulsewidth of 40 ns minimum. The architecture utilizes a segmented R-2R ladder for high-speed performance.

Feature Summary

• 12-bit resolution with guaranteed ±0.5 LSB INL and DNL linearity
• Parallel data interface with 40 ns minimum write pulsewidth
• Low power consumption: typically 5 μA supply current (5 mW typ)
• Fast settling time of 600 ns to 0.01% with external amplifier

Applications

• Battery-powered instrumentation
• Laptop computers
• Upgrades for all 754x series DACs in 5 V designs

Procurement Notes

Verify the specific ordering suffix '-BREEL' against official Analog Devices documentation to confirm reel packaging specifications. Ensure compatibility with the 20-SSOP footprint and validate that the industrial temperature grade (-40°C to +85°C) meets system requirements. Cross-reference pin assignments for the parallel interface (DB11–DB0, CS, WR) during integration.

Selection Notes

Select this component when a 12-bit parallel DAC with low glitch impulse (60 nV-s) and fast settling is required. It serves as a direct replacement for the AD7545 in existing 5 V designs while offering superior speed and lower power. Consider the biased mode operation for single-supply applications where outputs are referenced to 1.23 V.

Part Context

This part belongs to the AD7943/AD7945/AD7948 family of multiplying DACs. While the AD7943 uses a serial interface and the AD7948 uses an 8-bit byte interface, the AD7945 specifically provides a full 12-bit parallel interface. All three share similar architectural features, including the segmented R-2R ladder and compatible pinouts for DIP, SOP, and SSOP packages.

Replacement Considerations

The datasheet explicitly states these devices will replace the industry-standard AD7545 in many applications.