AD7715AR-3

Overview

The AD7715AR-3 is a 16-bit, single-channel sigma-delta analog-to-digital converter (ADC) designed for low-frequency measurement applications. It operates from a single 3 V analog supply and a 3 V to 5.25 V digital supply. The device features a charge-balancing architecture with differential inputs and an external reference input. Key electrical specifications include a maximum integral nonlinearity of ±0.0015% of full-scale range, a typical standby current of 10 µA at 3.3 V, and a master clock frequency range of 400 kHz to 2.5 MHz. It supports programmable gain settings of 1, 2, 32, and 128, and offers a three-wire serial interface compatible with SPI, QSPI, Microwire, and DSP standards.

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 resolution without missing codes and low integral nonlinearity.
• Features on-chip digital filtering with programmable notch frequencies to reject power line interference.
• Includes self-calibration and system calibration modes to eliminate offset and gain errors.

Applications

• Low-level transducer signal conditioning
• Strain gauge measurements
• Thermocouple and RTD temperature sensing

Procurement Notes

Verify the specific suffix 'AR' indicates the SOIC package and '-3' denotes the 3 V analog supply variant. Confirm that the component meets the required operating temperature range of -40°C to +85°C. Ensure the ordering information matches the exact pinout and voltage specifications provided in the official Analog Devices datasheet.

Selection Notes

Select this component for single-channel, low-speed applications requiring high precision. The 3 V supply version is suitable for battery-powered systems. Consider the available gain settings and filter update rates when designing the signal chain. Verify compatibility with the host microcontroller's serial interface timing requirements.

Part Context

The AD7715 belongs to the AD7715 family of low-frequency, low-noise ADCs manufactured by Analog Devices. This series is engineered for precision measurement tasks where high resolution and low power consumption are critical. The AR-3 designation specifically identifies the industrial grade part in a small outline package optimized for 3 V operation.

Replacement Considerations

Direct replacements within the same family include the AD7715ARZ-3 for lead-free compliance or the AD7715ARUZ-3 for TSSOP packaging. Cross-family alternatives like the AD7714 offer higher resolution but differ in channel count and pin configuration.