AD7943ANZ-B

Overview

The AD7943ANZ-B is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, featuring a serial interface. It operates in Normal Mode with a +5 V supply or Biased Mode with a +3.3 V to +5 V supply. The device guarantees ±0.5 LSB relative accuracy and linearity in Normal Mode, while the -B suffix indicates ±1 LSB accuracy for single-supply Biased Mode applications. Key electrical parameters include a maximum gain error of ±2 LSB (Normal) or ±4 LSB (Biased), an output leakage current of 10 nA max at +25°C, and a typical power dissipation of 5 mW. It settles to 0.01% within 600 ns using an AD843 amplifier and exhibits a glitch impulse of 60 nV-s.

Feature Summary

• 12-bit resolution with serial data input via SRI pin
• Dual-mode operation: Normal (+5 V) and Biased (+3.3 V to +5 V)
• Guaranteed monotonicity over temperature range
• Low power consumption with typical IDD of 5 μA

Applications

• Battery-powered instrumentation
• Laptop computers
• Upgrades for legacy 754x series DAC designs

Procurement Notes

Verify the specific grade and package configuration against the ordering guide. The 'N' suffix denotes a 16-lead Plastic DIP package. Confirm that the application requires the Biased Mode specifications associated with the '-B' suffix, which differs in accuracy and operating voltage ranges from the standard B-grade devices.

Selection Notes

Select this component when a serial interface is required for space-constrained designs. Ensure the system can accommodate the 1.23 V bias voltage on AGND and IOUT2 pins if operating in single-supply mode. Verify that the output amplifier selection matches the bandwidth requirements, as settling time specifications depend on the external op-amp used.

Part Context

This part 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 is distinguished by its serial architecture. All three share similar internal R-2R ladder structures and performance characteristics, allowing for pin-compatible upgrades to older industry-standard parts.

Replacement Considerations

Public confirmed substitute part numbers: AD7543.