AD7943AN-B

Overview

The AD7943AN-B is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, designed for single-supply operation. It features a serial interface with four strobe inputs (STB1–STB4) and a serial data output (SRO). The device operates within a VDD range of +3.0 V to +5.5 V, supporting both Normal Mode (+5 V) and Biased Mode (+3.3 V to +5 V). Key electrical specifications include ±1 LSB relative accuracy, ±0.9 LSB maximum differential nonlinearity (DNL), and a typical power dissipation of 5 mW. The component is housed in a 16-lead Plastic DIP package.

Feature Summary

• 12-bit resolution with serial input interface and SRO status output
• ±1 LSB relative accuracy and ±0.9 LSB max DNL in Biased Mode
• Low power consumption: typically 5 μA supply current (5 mW at 5 V)
• Fast settling time of 5 μs (typical) to 0.01% in Biased Mode

Applications

• Battery-powered instrumentation requiring low power
• Laptop computer systems
• Upgrades for legacy 754x series DAC designs in 3.3 V/5 V environments

Procurement Notes

Verify the ordering suffix 'AN-B' corresponds to the 16-lead Plastic DIP package and the A Grade temperature range (-40°C to +85°C). Confirm that the application utilizes Biased Mode specifications, as this suffix denotes devices tested for single-supply operation with outputs biased at 1.23 V. Ensure compatibility with the required serial timing parameters for STB pulses and SRO data validity.

Selection Notes

Select the AD7943AN-B when a serial interface is preferred over parallel or byte-wide options provided by the AD7945 and AD7948 variants. This model is suitable for applications requiring single-supply operation between 3.3 V and 5.5 V. Designers must account for the specific Biased Mode performance characteristics, including the 1.23 V bias on AGND/IOUT2, rather than standard ground-referenced normal mode operation.

Part Context

The AD7943AN-B belongs to the AD7943/AD7945/AD7948 family of fast 12-bit multiplying DACs. While the AD7945 offers a 12-bit parallel interface and the AD7948 provides an 8-bit byte interface, the AD7943 is distinguished by its serial architecture. The '-B' suffix specifically identifies versions optimized for Biased Mode single-supply applications, differentiating them from the standard B Grade parts intended for Normal Mode +5 V operation.

Replacement Considerations

The AD7943AN-B serves as a direct functional replacement for the industry-standard AD7543 in many applications, offering superior speed and lower power consumption. When replacing older components, verify that the system can accommodate the serial control logic required for the AD7943, as the AD7543 may have different interface requirements.