AD7715AR-5

Overview

The AD7715AR-5 is a 16-bit, single-channel sigma-delta analog-to-digital converter (ADC) designed for low-frequency measurement applications. It operates from a single 5 V analog supply and accepts differential input signals directly from transducers. The device features an on-chip programmable gain amplifier with selectable gains of 1, 2, 32, and 128, eliminating the need for external signal conditioning. It utilizes a charge-balancing ADC architecture to achieve 16-bit resolution without missing codes. The component includes a digital filter with programmable notch frequencies and output update rates. It interfaces via a three-wire serial port compatible with SPI, QSPI, Microwire, and DSP standards. The part is housed in a 16-lead SOIC package.

Feature Summary

• Integrates a complete analog front end with a programmable gain amplifier and sigma-delta modulator for direct sensor interfacing.
• Provides high static accuracy with guaranteed 16-bit no-missing-code performance and low integral nonlinearity.
• Features a flexible digital filter allowing software control over output data rates and power line rejection notches.
• Supports multiple serial interface protocols including three-wire, SPI, QSPI, and Microwire modes.

Applications

• Low-frequency pressure measurement systems using strain gauges or load cells.
• Temperature measurement applications involving thermocouples or RTDs.
• Smart industrial transmitters requiring isolated signal acquisition.
• Weighing scales and force measurement instrumentation.

Procurement Notes

Verify the specific suffix 'AR' corresponds to the SOIC-16 package and '-5' indicates the 5 V operating voltage variant. Confirm RoHS compliance status as manufacturing revisions may alter material declarations. Check for obsolescence notices since some distributors list this model as discontinued. Ensure the source document matches the Rev E datasheet specifications for electrical parameters.

Selection Notes

Select the AD7715AR-5 when a single-channel, low-speed conversion is required with integrated signal conditioning. This model is suitable for designs needing a 5 V analog supply and a surface-mount SOIC footprint. Consider the AD7715ANZ-3 if through-hole packaging or 3 V operation is preferred. Evaluate the AD7715ARUZ-5REEL7 for tape-and-reel assembly requirements instead of tube packaging.

Part Context

The AD7715 belongs to Analog Devices' family of low-frequency sigma-delta ADCs. It serves as a complete analog front end, combining amplification, filtering, and conversion in a single chip. The 'A' grade denotes an extended temperature range of -40°C to +85°C. The 'R' suffix identifies the SOIC_W package option, while the '-5' specifies the nominal 5 V analog supply requirement.

Replacement Considerations

Public confirmed substitute part numbers include AD7715ARZ-5 and AD7715ARUZ-5REEL7. These variants share identical electrical specifications but differ in packaging type or reel configuration. Verify pin compatibility and thermal characteristics before substitution.