AD7795BRUZ

Overview

The AD7795BRUZ is a low power, low noise, complete analog front end for high precision measurement applications. It contains a low noise, 16-bit ∑-Δ ADC with six differential inputs. The on-chip low noise instrumentation amplifier allows signals of small amplitude to be interfaced directly to the ADC. Each device contains a precision, low noise, low drift internal band gap reference and can also accept up to two external differential references. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator that sets the common-mode voltage of a channel to AVDD/2. The low-side power switch powers down bridge sensors between conversions, minimizing system power consumption. The AD7795 operates with either an internal clock or an external clock. The output data rate varies from 4.17 Hz to 470 Hz. Both parts operate with a power supply from 2.7 V to 5.25 V. The B-grade part (AD7795) is specified for a temperature range of −40°C to +105°C. It consumes a current of 400 μA typical and is housed in a 24-lead TSSOP.

Feature Summary

• Six differential analog inputs
• Low noise, programmable gain, instrumentation amp
• Band gap reference with 4 ppm/°C drift typical
• Update rate: 4.17 Hz to 470 Hz

Applications

• Temperature measurement
• Pressure measurement
• Weigh scales
• Strain gage transducers
• Gas analysis

Procurement Notes

Verify the exact ordering suffix against the manufacturer's official documentation to ensure correct package type and grade specifications. Confirm RoHS compliance status and any specific environmental certifications required for your application before finalizing procurement orders.

Selection Notes

Select the AD7795BRUZ when a 16-bit resolution is sufficient for the application, offering lower power consumption compared to the 24-bit AD7794 variant. Ensure the design accommodates the 24-lead TSSOP package dimensions and provides adequate thermal management within the specified operating temperature range.

Part Context

The AD7795 belongs to the AD7794/AD7795 family of complete analog front ends designed for high precision measurement applications. It shares many features with the AD7794 but offers 16-bit resolution instead of 24-bit, making it suitable for applications where slightly lower resolution is acceptable but power efficiency is prioritized.

Replacement Considerations

The AD7794BRUZ is a direct pin-compatible alternative within the same family, offering 24-bit resolution instead of 16-bit. Designers should verify if the additional resolution is necessary and account for potential differences in power consumption and noise performance.