AD7948ANZ-B

Overview

The AD7948ANZ-B is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, designed for single-supply operation. It features an 8-bit byte interface with separate Most Significant Byte (MSB) and Least Significant Byte (LSB) chip selects. The device operates within a supply voltage range of +3.3 V to +5.5 V and guarantees monotonicity over temperature. Key performance metrics include ±0.5 LSB maximum integral and differential nonlinearity, a typical power consumption of 5 mW, and a settling time of 600 ns to 0.01% when paired with the AD843 amplifier. It utilizes an external reference input and provides current output at IOUT1.

Feature Summary

• 12-bit resolution with R-2R segmented architecture ensuring monotonicity
• 8-bit parallel byte interface with independent MSB/LSB control via CSMSB and CSLSB
• ±0.5 LSB max INL and DNL; ±2 LSB max gain error over temperature
• Low power consumption: typically 5 μA quiescent current (5 mW at 5 V)
• Fast settling time of 600 ns to 0.01% full-scale range

Applications

• Battery-powered instrumentation requiring low power and single-supply operation
• Laptop computers and portable electronic devices
• Upgrades for legacy 754x series DAC designs in 5 V systems

Procurement Notes

Verify the specific ordering suffix 'ANZ-B' against the manufacturer's official documentation to confirm package type (DIP), temperature grade (Industrial -40°C to +85°C), and bias mode specifications. Ensure compatibility with single-supply biased mode requirements if applicable. Cross-reference pinout configurations for the 20-lead DIP package to ensure correct board layout integration.

Selection Notes

Select the AD7948ANZ-B when an 8-bit byte-oriented interface is preferred over serial or full 12-bit parallel connections. This model is suitable for applications requiring single-supply operation (+3.3 V to +5 V) with biased mode capabilities. Compare settling times and glitch impulse specifications against system bandwidth requirements. Ensure the external reference voltage range aligns with the device's multiplying DAC characteristics.

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 12-bit parallel interface, the AD7948 specifically offers an 8-bit byte interface. All three models share similar accuracy and speed specifications but differ in data loading mechanisms and pin configurations.

Replacement Considerations

The datasheet identifies the AD7948 as a direct replacement for the industry-standard AD7548 in many 5 V designs, offering superior speed and lower power consumption. Verify pin compatibility and interface timing parameters when substituting legacy components.