AD7948BRSZ-REEL

Overview

The AD7948BRSZ-REEL is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, part of the AD7943/AD7945/AD7948 family. It features an 8-bit byte interface with separate Most Significant Byte (MSB) and Least Significant Byte (LSB) chip selects. The device operates on a single +3.3 V to +5 V supply, delivering a typical power consumption of 5 mW. Key performance metrics include ±0.5 LSB maximum Integral Nonlinearity (INL) and Differential Nonlinearity (DNL), ensuring monotonicity. It achieves a settling time of 600 ns to 0.01% and exhibits a low glitch impulse of 60 nV-s.

Feature Summary

• 12-bit resolution with ±0.5 LSB INL and DNL guarantees
• 8-bit parallel byte interface with independent MSB/LSB control
• Single-supply operation (+3.3 V to +5 V) with 5 mW typical power dissipation
• Fast settling time of 600 ns to 0.01% and 60 nV-s glitch impulse

Applications

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

Procurement Notes

Verify the specific ordering suffix 'REEL' confirms tape-and-reel packaging rather than tube packaging when sourcing components. Confirm that the 'B' grade designation aligns with the required industrial temperature range of -40°C to +85°C for the target application environment.

Selection Notes

Select this model over the AD7945 if an 8-bit byte-oriented data bus is preferred over a full 12-bit parallel interface. Ensure the system design accommodates the separate CSMSB and CSLSB control signals required for the dual-byte write operations defined in the truth table.

Part Context

This component belongs to the AD794x family of fast 12-bit multiplying DACs. It serves as the byte-interface variant within the group, complementing the serial AD7943 and the full-parallel AD7945. All three share identical core analog performance specifications while differing only in their digital input architecture.

Replacement Considerations

The AD7948BRSZ-REEL is designed as a direct drop-in replacement for the industry-standard AD7548 in 5 V designs. When substituting, verify that the existing board layout supports the SSOP-20 package dimensions and that the control logic correctly handles the distinct MSB/LSB strobing sequence.