AD7939BSUZ

Overview

The AD7939BSUZ is a 10-bit, high-speed successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices Inc. It features eight multiplexed analog input channels and operates from a single 2.7 V to 5.25 V power supply. The device achieves a maximum throughput rate of 1.5 MSPS with a low power consumption of 6 mW at 3 V supplies. It includes an on-chip 2.5 V reference, a channel sequencer, and a high-speed parallel interface supporting word and byte modes. The component is available in a 32-lead TQFP package.

Feature Summary

• Eight software-configurable analog input channels supporting single-ended, fully differential, or pseudo-differential configurations.
• Integrated accurate 2.5 V internal voltage reference with minimal temperature drift.
• High-speed parallel interface with independent logic power supply (VDRIVE) for flexible microprocessor interfacing.
• On-chip channel sequencer allowing preprogrammed sequential conversion of multiple inputs.

Applications

• Industrial process control systems requiring multi-channel data acquisition.
• Portable instrumentation utilizing single-supply operation and low power consumption.
• Data acquisition modules for DSP-based signal processing applications.

Procurement Notes

Verify the specific suffix against official documentation to confirm package type and temperature range. Ensure compatibility with system voltage levels and clock frequencies before integration. Cross-reference pin assignments with the latest datasheet revision to avoid interface mismatches during PCB design.

Selection Notes

Select this model when a 10-bit resolution is sufficient for the application requirements. Consider the AD7938 variant if 12-bit accuracy is necessary, noting the difference in dynamic performance specifications. Evaluate the need for the internal sequencer versus external channel switching based on system complexity.

Part Context

This component belongs to the AD7938/AD7939 family of multichannel ADCs. It shares architectural similarities with the AD7933/AD7934 series but offers eight channels instead of four. The device complements other SAR ADCs in the portfolio by providing a balance between speed, resolution, and power efficiency.

Replacement Considerations

The AD7938BSUZ serves as the 12-bit counterpart within the same package and feature set. For lower channel counts, the AD7933/AD7934 series provides similar functionality with four inputs. Verify electrical parameters and pinout compatibility when substituting with other multichannel SAR ADCs.