AD7938BCPZ-REEL7

Overview

The AD7938BCPZ-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 maximum power consumption of 6 mW at 3 V supplies. 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 conversion sequences.
• Integrated precise 2.5 V internal voltage reference with low temperature coefficient.
• Software-selectable analog input configurations including single-ended, fully differential, and pseudo-differential modes.
• VDRIVE function enabling the parallel digital interface to operate independently of the analog supply voltage.

Applications

• Industrial process control systems requiring multi-channel data acquisition.
• Portable instrumentation utilizing battery-powered single-supply operation.
• Medical equipment demanding low noise and high accuracy signal processing.
• Automotive sensor interfaces compatible with standard microprocessor logic levels.

Procurement Notes

Verify the specific ordering suffix REEL7 confirms the reel packaging format upon purchase. Ensure the B version designation matches the required -40°C to +85°C operating temperature range. Confirm that the LFCSP-32 package dimensions align with the target PCB footprint. Validate RoHS compliance status through official manufacturer documentation prior to integration.

Selection Notes

Select this component when eight simultaneous or sequential analog inputs are required within a compact surface-mount form factor. The AD7938 is suitable for applications needing 12-bit resolution at speeds up to 1.5 MSPS. Consider the VDRIVE feature if interfacing with processors operating at different logic voltages than the analog supply. Evaluate the internal reference specifications against external precision requirements.

Part Context

This part belongs to the AD7938/AD7939 family of 12-bit and 10-bit parallel ADCs. The AD7938 variant specifically provides 12-bit resolution, whereas the AD7939 offers 10-bit resolution. Both share identical pinouts and functional architectures but differ in linearity specifications. The BC suffix indicates the commercial temperature grade variant.

Replacement Considerations

The AD7938BSUZ serves as a tray-packaged alternative with identical electrical characteristics. The AD7939 series offers a lower-resolution option within the same package and functionality scope. Verify pin compatibility and register configuration before substituting with other SAR ADC families.