AD7943ARS-B

Overview

The AD7943ARS-B is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, featuring a serial interface and housed in a 20-lead SSOP package. Designed for single-supply operation, it supports a VDD range of +3.3 V to +5.5 V. The component guarantees ±1 LSB relative accuracy and ±0.5 LSB maximum differential nonlinearity (DNL). It operates within an industrial temperature range of –40 °C to +85 °C. Key electrical parameters include a typical power dissipation of 5 mW, a settling time of 600 ns to 0.01%, and a glitch impulse of 60 nV-s.

Feature Summary

• 12-bit resolution with serial data input (SRI) and strobe control inputs (STB1–STB4)
• Guaranteed monotonicity with ±0.5 LSB maximum DNL
• Low power consumption: typically 5 μA supply current at idle
• Fast settling time of 600 ns to 0.01% full-scale range

Applications

• Battery-powered instrumentation systems
• Laptop computer peripheral interfaces
• Upgrades for legacy 754x series DAC designs in 5 V environments

Procurement Notes

Verify the ordering suffix 'ARS-B' confirms the SSOP-20 package and Biased Mode specification (+3.3 V to +5 V supply). Confirm the B grade indicates ±1 LSB relative accuracy and the –40 °C to +85 °C operating temperature range. Ensure compatibility with single-supply biased mode configurations where IOUT1 and AGND are biased to 1.23 V.

Selection Notes

Select this model when a serial interface is required for space-constrained PCB layouts using the SSOP package. The Biased Mode variant is suitable for single-supply applications requiring output swing around a mid-rail bias point (1.23 V). Compare against the AD7943BNZ if a DIP package or Normal Mode (+5 V only) operation is preferred instead.

Part Context

This component belongs to the AD7943/AD7945/AD7948 family of fast 12-bit multiplying DACs. While the AD7945 uses a parallel interface and the AD7948 uses an 8-bit byte interface, the AD7943 specifically utilizes a serial shift register architecture. The 'ARS-B' designation distinguishes it by package type (SSOP) and operational mode (Biased), differentiating it from the standard AD7943AN-B which uses a SOP package.

Replacement Considerations

The AD7943AR (without the -B suffix) serves as a direct replacement for Normal Mode applications but lacks guaranteed Biased Mode specifications. For package-only changes, the AD7943AN-B offers identical electrical performance in a 16-lead SOP package.