AD7943BRSZ

Overview

The AD7943BRSZ is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, featuring a serial interface. It operates on a single +5 V supply with guaranteed linearity of ±0.5 LSBs for both Integral Nonlinearity (INL) and Differential Nonlinearity (DNL). The device supports a nominal reference voltage of 10 V in normal mode, achieving a typical settling time of 600 ns to 0.01%. It consumes approximately 5 mW of power and includes a serial data output (SRO). The component is housed in a 20-lead Shrink Small Outline Package (SSOP) and functions within an industrial temperature range of –40 °C to +85 °C.

Feature Summary

• 12-bit resolution with ±0.5 LSB max INL and DNL accuracy
• Serial interface with 40 ns minimum strobe pulsewidth
• Low power consumption: typically 5 μA supply current (5 mW at 5 V)
• Fast settling time: 600 ns to 0.01% with AD843 amplifier

Applications

• Battery-powered instrumentation
• Laptop computers
• Upgrades for AD754x series DAC designs

Procurement Notes

Verify the package designation 'RS' corresponds to the 20-lead SSOP option when sourcing. Confirm the 'B' grade ensures the specified ±0.5 LSB linearity and –40 °C to +85 °C operating range. Check datasheet revisions for any updates to timing parameters or absolute maximum ratings before finalizing procurement specifications.

Selection Notes

Select the AD7943BRSZ for applications requiring a serial interface and high precision in a compact surface-mount package. Ensure the system design accommodates the 40 ns strobe pulsewidth requirement. For single-supply biased mode operation, verify that the IOUT2 and AGND pins can be biased to 1.23 V, as this variant is optimized for standard +5 V normal mode operation.

Part Context

The AD7943BRSZ 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 input structure. This family serves as a performance upgrade over the legacy AD754x series, offering superior speed and lower power consumption while maintaining pin compatibility in many designs.

Replacement Considerations

The AD7943BRSZ is designed to replace the industry-standard AD7543 in 5 V designs. When substituting, ensure the existing circuit supports the faster 40 ns write/strobe timing and the specific serial clocking requirements of the AD7943.