AD7938BSUZ-REEL7

Overview

The AD7938BSUZ-REEL7 is a high-speed, low-power 12-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices Inc. It features eight analog input channels with an integrated channel sequencer and operates from a single 2.7 V to 5.25 V power supply. The device achieves throughput rates up to 1.5 MSPS with a differential track-and-hold amplifier capable of handling input frequencies up to 50 MHz. It includes an accurate on-chip 2.5 V reference and supports software-configurable single-ended, fully differential, or pseudo-differential inputs. The component utilizes a high-speed parallel interface with word/byte modes and is housed in a 32-lead LFCSP package.

Feature Summary

• Eight analog input channels with a programmable channel sequencer for automated sequential conversion.
• Software-selectable analog input configurations supporting single-ended, fully differential, and pseudo-differential modes.
• Integrated precise 2.5 V internal voltage reference with options for external overdrive.
• VDRIVE function enabling the parallel digital interface to operate independently at 3 V or 5 V logic levels.

Applications

• Industrial process control systems requiring multi-channel data acquisition.
• Portable instrumentation utilizing single-supply operation and low power consumption.
• Data acquisition modules interfacing directly with microprocessors or DSPs via parallel bus.

Procurement Notes

Verify that the specific ordering suffix matches the required reel packaging configuration. Confirm the temperature grade corresponds to the commercial range specifications. Ensure the pinout aligns with the 32-lead LFCSP footprint requirements for your PCB layout.

Selection Notes

Select this model when 12-bit resolution and 1.5 MSPS throughput are required across multiple channels. Consider the AD7939 variant if 10-bit resolution suffices for lower cost applications. Evaluate the VDRIVE voltage requirement to ensure compatibility with the host processor's logic levels.

Part Context

This component belongs to the AD7938/AD7939 family of multichannel SAR ADCs. It shares architectural similarities with the AD7933/AD7934 series but offers eight channels instead of four. The part is designed for applications demanding simultaneous high speed and low power dissipation in compact form factors.

Replacement Considerations

The AD7938BSUZ-6 is documented as a parameter-equivalent alternative within the same product family.