AD7938BCPZ

Overview

The AD7938BCPZ-REEL7 is a 12-bit, high-speed, low-power 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 and is housed in a 32-lead LFCSP package.

Feature Summary

• Eight analog input channels with a programmable channel sequencer for sequential conversion.
• Software-selectable analog input configurations including single-ended, fully differential, and pseudo-differential modes.
• Integrated precise 2.5 V internal voltage reference with external overdrive capability.
• VDRIVE function enabling direct connection to 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 single-supply operation.
• Data acquisition modules interfacing with microprocessors via parallel interfaces.

Procurement Notes

Verify the specific ordering suffix REEL7 indicates reel packaging when sourcing components. Confirm that the B version meets the required operating temperature range of -40°C to +85°C. Ensure compatibility with the 32-lead LFCSP footprint during PCB layout planning. Cross-reference the datasheet revision F specifications against current procurement requirements.

Selection Notes

Select this model for applications requiring 12-bit resolution with an 8-channel multiplexer. Consider the AD7939 if 10-bit resolution is sufficient for lower cost. Evaluate the parallel interface requirements against available microprocessor GPIO resources. Verify that the 1.5 MSPS throughput rate aligns with system bandwidth constraints.

Part Context

This component belongs to the AD7938/AD7939 family of high-speed, low-power SAR ADCs. It shares functional similarities with the AD7933 and AD7934 but offers eight channels instead of four. The device is designed to replace older multiplexed ADC solutions in compact industrial designs.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified source material.