AD7945BRS-REEL

Overview

The AD7945BRS-REEL is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, housed in a 20-lead Shrink Small Outline Package (SSOP). It features a parallel interface with 12-bit data inputs and operates on a single +5 V supply. Key electrical specifications include ±0.5 LSB maximum integral and differential nonlinearity, a typical settling time of 600 ns to 0.01%, and low power consumption of 5 mW. The device supports normal mode operation at +5 V and biased mode for single-supply applications between +3.3 V and +5 V.

Feature Summary

• 12-bit resolution with ±0.5 LSB INL and DNL accuracy
• Parallel interface with 40 ns write pulsewidth
• Fast settling time of 600 ns to 0.01% full-scale range
• Low glitch impulse of 60 nV-s

Applications

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

Procurement Notes

Verify the RS suffix indicates the SSOP package option when sourcing this component. Confirm the REEL designation matches required tape-and-reel quantities for automated assembly processes. Ensure the B grade specification aligns with the -40°C to +85°C industrial temperature range requirements for the target application environment.

Selection Notes

Select the AD7945BRS variant specifically for its 20-lead SSOP footprint and parallel data bus compatibility. This model replaces industry-standard AD7545 devices while offering superior speed and lower power consumption. Consider the 600 ns settling time and 60 nV-s glitch impulse for high-speed signal processing needs.

Part Context

This component belongs to the AD7943/AD7945/AD7948 family of fast 12-bit multiplying DACs. While the AD7943 uses a serial interface and the AD7948 utilizes an 8-bit byte interface, the AD7945 is defined by its 12-bit parallel input structure. All variants share similar core performance characteristics and architectural benefits over legacy parts.

Replacement Considerations

Publicly confirmed direct replacements within the same family include the AD7945BN (DIP package) and AD7945BR (SOP package). These alternatives maintain identical electrical specifications but differ in physical packaging form factors.