AD7945BR

Overview

The AD7945BR is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, featuring a parallel interface. It operates on a single +5 V supply with guaranteed linearity of ±0.5 LSBs INL and DNL over the industrial temperature range of –40°C to +85°C. The device delivers fast performance with a settling time of 600 ns to 0.01% and low glitch impulse of 60 nV-s. It consumes typically 5 mW of power and includes a 12-bit parallel data bus controlled by Chip Select (CS) and Write (WR) signals.

Feature Summary

• 12-bit resolution with ±0.5 LSB maximum Integral and Differential Nonlinearity
• Parallel interface with 40 ns minimum write pulsewidth at +5 V
• Low power consumption: typically 5 μA quiescent current (5 mW)
• Fast settling time of 600 ns to 0.01% full-scale range

Applications

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

Procurement Notes

Verify the package option matches the required footprint; the 'R' suffix indicates a Small Outline Package (SOP). Confirm the temperature grade corresponds to the application environment, as the B-grade covers –40°C to +85°C. Ensure supply voltage constraints align with the specified Normal Mode (+5 V) or Biased Mode (+3.3 V to +5 V) requirements.

Selection Notes

Select the AD7945BR when a parallel interface is preferred over serial options like the AD7943. Choose this component for applications requiring high speed and low power within a standard 5 V system. For extended temperature ranges up to +125°C, consider the T-grade variant instead.

Part Context

The AD7945BR belongs to the AD7943/AD7945/AD7948 family of 12-bit multiplying DACs. It serves as a direct replacement for industry-standard parts like the AD7545, offering superior speed and lower power consumption while maintaining compatibility with existing 5 V designs.

Replacement Considerations

Public confirmed substitute part numbers include AD7945BN (DIP package) and AD7945BRS (SSOP package).