AD7945ANZ-B

Overview

The AD7945ANZ-B is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, featuring a parallel interface and housed in a 20-lead Plastic DIP package. Designed for single-supply operation, it functions in Normal Mode with a +5 V supply or Biased Mode with +3.3 V to +5 V supplies. The device guarantees ±1 LSB relative accuracy and ±0.9 LSB differential nonlinearity in Biased Mode. It operates within an industrial temperature range of –40 °C to +85 °C, consuming typically 5 mW of power.

Feature Summary

• 12-bit resolution with R-2R segmented architecture
• Parallel data interface with CS and WR control signals
• Biased mode support for single-supply applications (+3.3 V to +5 V)
• Guaranteed monotonicity over the full temperature range

Applications

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

Procurement Notes

Verify the specific ordering suffix 'ANZ-B' against the manufacturer's current documentation to confirm package type and electrical grade. Ensure compatibility with system voltage requirements, as this variant supports both standard and biased operating modes.

Selection Notes

Select this component when a 12-bit parallel input DAC is required for single-supply environments. The Biased Mode specification allows operation with lower supply voltages while maintaining output swing capabilities suitable for unipolar signal generation.

Part Context

This part belongs to the AD7943/AD7945/AD7948 family of fast multiplying DACs. While the AD7943 uses a serial interface and the AD7948 uses an 8-bit byte interface, the AD7945 specifically utilizes a 12-bit parallel bus for data loading.

Replacement Considerations

The datasheet identifies the AD7545 as a compatible industry-standard replacement target for many applications, offering superior speed and power performance compared to the legacy component.