AD7945ARS-B

Overview

The AD7945ARS-B 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 guaranteed linearity of ±1 LSB relative accuracy and ±0.9 LSB differential nonlinearity. The device utilizes an R-2R segmented architecture for fast settling times up to 5 µs and low power consumption of 5 mW typical. Designed for biased mode applications, it supports unipolar and bipolar output configurations with external amplifiers.

Feature Summary

• 12-bit resolution with ±1 LSB relative accuracy and ±0.9 LSB DNL
• Parallel data interface with active-low Chip Select (CS) and Write (WR) inputs
• Single-supply operation ranging from +3.3 V to +5.5 V
• Low glitch impulse of 60 nV-s and typical power dissipation of 5 mW

Applications

• Battery-powered instrumentation systems
• Laptop computer peripheral interfaces
• Upgrades for legacy 754x series DAC designs

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature range specifications. Ensure compatibility with system voltage levels and interface timing requirements before integration.

Selection Notes

Select this component for applications requiring a parallel interface and single-supply operation between 3.3 V and 5 V. Consider the AD7943 or AD7948 if serial or byte-wide interfaces are preferred instead of the 12-bit parallel bus required by the AD7945.

Part Context

Part of the AD7943/AD7945/AD7948 family of fast 12-bit multiplying DACs. The AD7945 specifically provides a 12-bit parallel interface, distinguishing it from the serial AD7943 and byte-wide AD7948 variants within the same architectural family.

Replacement Considerations

Direct replacements include other AD7945 variants such as AD7945BN (DIP) or AD7945BR (SOP). For pin-compatible upgrades, consider the AD7545, though performance characteristics will differ.