AD7796BRUZ

Overview

The AD7796BRUZ is a low-power, 16-bit Sigma-Delta analog-to-digital converter (ADC) designed for high-precision bridge sensor applications. It integrates a fixed-gain instrumentation amplifier and an on-chip temperature sensor within a single 16-lead TSSOP package. The device operates on a power supply ranging from 2.7 V to 5.25 V with a typical current consumption of 250 µA. It features one differential analog input channel and supports software-programmable output data rates between 4.17 Hz and 123 Hz. The component utilizes a 3-wire serial interface compatible with SPI, QSPI, Microwire, and DSP protocols.

Feature Summary

• Integrated instrumentation amplifier with a fixed gain of 128 for direct connection to small amplitude signals
• On-chip temperature sensor internally connected to the ADC for bridge temperature compensation
• Simultaneous rejection of 50 Hz and 60 Hz line frequencies
• Independent digital interface power supply allowing flexible logic level interfacing

Applications

• Weigh scales
• Strain gages
• Industrial process control
• Portable instrumentation

Procurement Notes

Verify the specific revision status of the AD7796BRUZ before procurement, as Analog Devices periodically updates datasheets. Confirm that the B-version suffix meets the required operating temperature range of -40°C to +85°C. Ensure the ordering quantity matches the standard tube packaging format typically associated with this part number rather than reel quantities.

Selection Notes

Select the AD7796BRUZ when a 16-bit resolution is sufficient for the application, distinguishing it from the 24-bit AD7797 variant. Consider the fixed internal gain of 128; if external gain adjustment is required, other family members may be more suitable. Verify that the single differential input channel aligns with the system's sensor count requirements.

Part Context

The AD7796 belongs to the AD779x series of complete analog front ends developed by Analog Devices. It shares architectural similarities with the AD7797 but offers lower bit resolution. This series is specifically engineered for bridge sensor interfaces, combining signal conditioning and conversion in a compact surface-mount package to minimize board space and external component count.

Replacement Considerations

The AD7797BRUZ serves as a higher-resolution alternative within the same package. For systems requiring multiple channels, the AD7794 or AD7795 provide additional inputs. If a different pinout or interface protocol is necessary, cross-referencing with the AD7792 or AD7793 families is recommended.