AD7195BCPZ-RL7

Overview

The AD7195BCPZ-RL is a low-noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC). The on-chip low noise gain stage means that signals of small amplitude can be interfaced directly to the ADC. The AD7195 contains ac excitation, which is used to remove dc-induced offsets from bridge sensors.

Feature Summary

• AC or DC sensor excitation
• RMS noise: 8.5 nV at 4.7 Hz (gain = 128)
• Up to 22.5 noise-free bits (gain = 1)
• Offset drift: 5 nV/°C
• Gain drift: 1 ppm/°C

Applications

• Weigh scales
• Strain gage transducers
• Pressure measurement
• Temperature measurement
• Chromatography

Procurement Notes

Verify the specific ordering suffix RL against the manufacturer's current documentation to confirm reel packaging and quantity specifications. Ensure compatibility with system requirements for AVDD (4.75 V to 5.25 V) and DVDD (2.7 V to 5.25 V) power supplies before procurement.

Selection Notes

Select this component for applications requiring ultralow noise and high resolution in precision measurement systems. Consider the programmable gain amplifier range of 1 to 128 and the output data rate flexibility from 4.7 Hz to 4.8 kHz when designing signal conditioning circuits.

Part Context

The AD7195 is part of Analog Devices' family of 24-bit sigma-delta ADCs designed for high precision measurement applications. It integrates a low-noise PGA and AC excitation capabilities, simplifying the design of systems using bridge sensors such as load cells and pressure transducers.

Replacement Considerations

Consult the official datasheet for alternative part numbers within the AD719x family, such as the AD7190 or AD7192, which may offer similar performance characteristics but with different input configurations or feature sets.

FAQ

What is the purpose of the AC excitation feature?

The AC excitation feature is used to remove dc-induced offsets from bridge sensors by reversing the bridge excitation polarity.

How many differential inputs does the AD7195 support?

The device can be configured to have two differential inputs or four pseudo differential inputs.

What is the maximum output data rate?

The output data rate can vary up to 4.8 kHz.