AD7948ARS-B

Overview

The AD7948ARS-B is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, housed in a 20-lead SSOP package. It features an 8-bit byte interface with separate MSB and LSB chip selects. The device operates on a single +3.3 V to +5.5 V supply and guarantees ±0.5 LSB integral and differential nonlinearity. Key electrical parameters include a maximum gain error of ±2 LSBs, a typical power dissipation of 5 mW, and a write pulse width of 40 ns. It supports both normal mode (+5 V) and biased mode (+3.3 V to +5 V) configurations.

Feature Summary

• 12-bit resolution with R-2R segmented architecture
• 8-bit parallel byte interface with CSMSB/CSLSB control
• ±0.5 LSB INL and DNL guaranteed over temperature
• Low glitch impulse of 60 nV-s

Applications

• Battery-powered instrumentation
• Laptop computer systems
• Upgrades for legacy 754x series DAC designs

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm pinout compatibility and performance grade. Confirm that the required supply voltage range aligns with the device's specified operational limits for either normal or biased modes.

Selection Notes

Select this component when an 8-bit byte-oriented parallel interface is required instead of full 12-bit parallel or serial options. Ensure the system design accommodates the external reference input and output amplifier configuration necessary for the desired voltage swing and settling time specifications.

Part Context

This part belongs to the AD7943/AD7945/AD7948 family of fast multiplying DACs. While the AD7943 uses a serial interface and the AD7945 uses a 12-bit parallel interface, the AD7948 specifically provides an 8-bit byte interface to facilitate data handling in microprocessor systems.

Replacement Considerations

The datasheet identifies the AD7548 as a legacy industry-standard replacement target. Verify pin compatibility and interface logic levels when migrating from older DAC architectures.