AD7948ARS-BREEL

Overview

The AD7948ARS-BREEL is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices Inc., featuring an 8-bit byte interface. It operates on a single +3.3 V to +5 V supply, supporting both Normal Mode (+5 V) and Biased Mode (+3.3 V to +5 V). The device guarantees ±0.5 LSBs Integral Nonlinearity (INL) and Differential Nonlinearity (DNL) in Normal Mode, with a typical power consumption of 5 mW. Key performance metrics include a fast settling time of 600 ns to 0.01% and a low glitch impulse of 60 nV-s when connected with an amplifier.

Feature Summary

• 12-bit resolution with segmented architecture for high accuracy
• 8-bit byte interface with CSMSB, CSLSB, WR, and LDAC control signals
• Guaranteed monotonicity over temperature with ±0.5 LSB max INL/DNL
• Low power operation: 5 μA typical quiescent current

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 'BREEL' against official Analog Devices documentation to confirm reel packaging specifications and tape-and-reel dimensions. Ensure the component grade matches the required temperature range (-40 °C to +85 °C for B Grade). Confirm pin compatibility with existing PCB footprints for the 20-lead SSOP package before procurement.

Selection Notes

Select the AD7948 variant specifically when an 8-bit parallel byte interface is required for system integration. Choose the '-B' suffix version if single-supply biased mode operation between 3.3 V and 5 V is necessary. Compare settling time requirements; the AD7948 achieves 600 ns to 0.01% with an AD843 amplifier. Ensure reference voltage inputs align with the specified input resistance ranges for Normal or Biased modes.

Part Context

The AD7948 is part of the AD7943/AD7945/AD7948 family of fast 12-bit multiplying DACs. While the AD7943 uses a serial interface and the AD7945 uses a full 12-bit parallel interface, the AD7948 utilizes an 8-bit byte interface. This family serves as a direct replacement for industry-standard AD7543, AD7545, and AD7548 devices, offering improved speed and lower power consumption while maintaining pin-out compatibility where applicable.

Replacement Considerations

The AD7948 is designed to replace the AD7548. Verify that the host system supports the active-low write and chip select logic levels. Check that the output amplifier bandwidth is sufficient to handle the 600 ns settling time specification.