AD7795BRUZ-REEL

Overview

The AD7795BRUZ-REEL is a low-power, low-noise analog front end featuring a 16-bit Sigma-Delta ADC with six differential inputs. It integrates a programmable gain instrumentation amplifier (gain 1 to 128), an internal bandgap reference, and excitation current sources. The device operates on a 2.7 V to 5.25 V supply, consuming 400 μA typical current. It supports output data rates from 4.17 Hz to 470 Hz and includes simultaneous 50 Hz/60 Hz rejection. The B-grade variant functions within a temperature range of -40°C to +105°C.

Feature Summary

• Integrates a 16-bit Sigma-Delta ADC with six differential analog input channels.
• Includes a low-noise programmable gain instrumentation amplifier for direct sensor interfacing.
• Features an internal precision bandgap reference with low drift characteristics.
• Provides programmable excitation current sources and a low-side power switch.

Applications

• Temperature measurement
• Pressure measurement
• Weigh scales
• Strain gage transducers
• Industrial process control

Procurement Notes

Verify the specific grade designation when ordering, as the AD7795B is rated for -40°C to +105°C operation. Confirm that the REEL suffix indicates tape-and-reel packaging suitable for automated assembly processes. Ensure compatibility with the system's serial interface requirements before finalizing procurement.

Selection Notes

Select this component for applications requiring multiple differential inputs without external amplifiers. The integrated reference simplifies design by reducing component count. Verify that the 16-bit resolution meets the system accuracy needs, as the AD7794 offers 24-bit resolution if higher precision is required.

Part Context

This part belongs to the AD7794/AD7795 family of complete analog front ends designed for high-precision measurement. While the AD7794 provides 24-bit resolution, the AD7795 offers 16-bit resolution. Both share identical pinouts and feature sets, differing primarily in ADC bit depth.

Replacement Considerations

The AD7794 serves as a higher-resolution alternative within the same package. Other Analog Devices ADCs may require significant circuit redesign due to differences in pinout or interface protocols.

FAQ

Can the AD7795 operate with both internal and external references?

Yes, the device contains an internal bandgap reference but can also accept up to two external differential references via the REFIN pins.

What is the function of the PSW pin?

The PSW pin acts as a low-side power switch to GND, allowing the user to power down bridge sensors between conversions to minimize system power consumption.

How does the device handle clocking?

The AD7795 can operate using its internal clock oscillator or accept an external clock signal via the CLK pin for synchronized multi-device systems.