AD7938BSUZ-6

Overview

The AD7938BSUZ-6 is a 12-bit successive approximation register (SAR) analog-to-digital converter featuring eight analog input channels and an integrated channel sequencer. It operates on a single 2.7 V to 5.25 V supply with throughput rates up to 625 kSPS. The device includes a low-noise, wide-bandwidth differential track-and-hold amplifier capable of handling input frequencies up to 50 MHz. Power consumption reaches a maximum of 7.5 mW at 625 kSPS with a 5 V supply. It supports software-configurable single-ended, fully differential, or pseudo-differential inputs and utilizes a high-speed parallel interface.

Feature Summary

• Eight analog input channels with a programmable channel sequencer for automated sequential conversion.
• Integrated accurate 2.5 V reference source with low temperature coefficient.
• Software-selectable analog input configurations including single-ended, fully differential, and pseudo-differential modes.
• VDRIVE function enabling the parallel interface to operate independently from the main power supply voltage.

Applications

• Industrial process control systems requiring multi-channel data acquisition.
• Battery-powered instrumentation utilizing low-power SAR architecture.
• Medical equipment needing precise signal digitization with flexible input ranges.
• Automotive sensor interfaces supporting differential signal processing.

Procurement Notes

Verify the specific suffix designation against the manufacturer's current ordering guide to ensure compatibility with required package types and temperature grades. Confirm that the procurement documentation explicitly references the AD7938-6 datasheet specifications rather than standard family variants. Ensure all technical parameters align with the verified local source material provided.

Selection Notes

Select this component when an application requires multiple analog inputs managed by an internal sequencer without external multiplexing overhead. The VDRIVE feature is critical for interfacing directly with processors operating at different logic levels than the analog supply. Consider the 625 kSPS throughput limit and the specific noise performance requirements relative to the available 69 dB SINAD specification.

Part Context

This part belongs to the AD7938-6 series, which distinguishes itself from the standard AD7938 by offering reduced throughput optimized for lower power consumption. While the standard AD7938 achieves 1.5 MSPS, the -6 variant focuses on efficiency at 625 kSPS. It shares the same 12-bit resolution and eight-channel architecture but targets applications where power management is prioritized over maximum sampling speed.

Replacement Considerations

The AD7938BSUZ serves as the primary equivalent within the same product family, differing primarily in maximum throughput capabilities. Verify pinout compatibility between TQFP and LFCSP packages if substituting physical form factors. Ensure that any replacement maintains support for the required channel sequencer functionality and parallel interface timing constraints.