AD7943BRS

Overview

The AD7943BRS is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, housed in a 20-lead SSOP package. It features a serial interface with four strobe inputs for data loading and an asynchronous clear function. The device operates on a single +5 V supply in Normal Mode or between +3.3 V and +5 V in Biased Mode. Key electrical specifications include ±0.5 LSB maximum integral and differential nonlinearity, a typical power dissipation of 5 mW, and a fast output voltage settling time of 600 ns to 0.01%. It serves as a high-speed, low-power replacement for legacy industry-standard DACs.

Feature Summary

• 12-bit resolution with guaranteed ±0.5 LSB INL and DNL linearity
• Serial interface utilizing SRI input and STB1–STB4 strobe signals
• Low power consumption with typical IDD of 5 μA at standby
• Fast settling time of 600 ns to 0.01% full-scale range

Applications

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

Procurement Notes

Verify the specific ordering suffix 'R' corresponds to the SSOP-20 package option when sourcing components. Confirm that the B grade temperature range (-40 °C to +85 °C) meets the operational requirements of the target environment. Ensure compatibility with the required +5 V nominal supply voltage for Normal Mode operation.

Selection Notes

Select the AD7943BRS over parallel variants like the AD7945 when board space is limited by the smaller SSOP footprint compared to DIP options. Choose this serial model if the host system has limited GPIO pins available for data transmission. Consider the AD7948 if an 8-bit byte-wide interface is preferred over the 12-bit serial shift register architecture.

Part Context

This component 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 data path. All three share identical core DAC performance metrics, including linearity and settling speed, allowing for pin-compatible design flexibility across different interface needs.

Replacement Considerations

The datasheet identifies the AD7943BRS as a direct upgrade for the industry-standard AD7543 in 5 V designs. When replacing legacy parts, verify that the new serial control logic aligns with the microprocessor's communication protocol. The improved speed and lower power consumption are primary benefits over the older generation.