AD7938BCPZ-6REEL7

Overview

The AD7938BCPZ-6REEL7 is a 12-bit, high-speed successive approximation register (SAR) analog-to-digital converter featuring eight multiplexed analog input channels and an integrated sequencer. It operates from a single 2.7 V to 5.25 V supply with throughput rates up to 625 kSPS. The device includes a low-noise track-and-hold amplifier capable of handling input frequencies up to 50 MHz. Key specifications include a maximum power consumption of 7.5 mW at 5 V, a signal-to-noise ratio of 71 dB in differential mode, and an on-chip 2.5 V reference. It utilizes a parallel interface with word/byte modes and supports software-configurable single-ended, fully differential, or pseudo-differential inputs.

Feature Summary

• Eight-channel analog input multiplexer with programmable channel sequencer for automated sequential conversions.
• Integrated accurate 2.5 V voltage reference with low temperature coefficient and noise performance.
• Flexible power management including full shutdown and autostandby modes for reduced energy consumption.
• VDRIVE function enabling direct interfacing with 3 V or 5 V processor systems independent of the main supply.

Applications

• Industrial process control systems requiring multi-channel data acquisition.
• Portable instrumentation utilizing battery-powered operation with low power requirements.
• Data acquisition modules in test and measurement equipment.
• Automotive sensor interfaces needing isolated or differential signal conditioning.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet revision to ensure package type and reel configuration match system requirements. Confirm that the component meets RoHS compliance standards relevant to the target market. Check for any recent product change notices regarding manufacturing sites or materials. Ensure the supplier provides valid traceability documentation for quality assurance purposes.

Selection Notes

Select this component when a balance of moderate speed and low power consumption is required for multi-channel applications. Consider the internal sequencer capability if microprocessor overhead needs to be minimized during channel switching. Evaluate the VDRIVE pin compatibility with the host logic levels to simplify interface design. Compare the 625 kSPS throughput against higher-speed alternatives like the AD7938 if faster sampling is necessary.

Part Context

This part belongs to the AD7938-6 family of 12-bit SAR ADCs designed for low-power, multi-channel applications. It shares architectural similarities with the AD7939 but offers higher resolution. The device is distinct from the standard AD7938 which supports higher speeds up to 1.5 MSPS. It is commonly paired with evaluation boards such as the EVAL-AD7938CBZ for performance characterization.

Replacement Considerations

The AD7938BSUZ-6 is a parameter-equivalent alternative within the same family offering similar functionality. Users should verify pinout compatibility and electrical specifications before substitution. Other family members like the AD7938 or AD7939 provide different speed or resolution options but may require interface adjustments.