AD7715ARZ-5

Overview

The AD7715ARZ-5 is a 16-bit, low-power sigma-delta analog-to-digital converter (ADC) designed for precision measurement applications. It operates from a single 5 V analog supply and a 3 V or 5 V digital supply, consuming a maximum of 450 µA at 3 V supplies. The device features a programmable gain front end with gains of 1, 2, 32, and 128, allowing direct interfacing with low-level transducers. It provides differential analog inputs and supports unipolar ranges up to 2.5 V and bipolar ranges up to ±2.5 V. The integrated digital filter offers programmable output update rates with notches at 50 Hz and 60 Hz. Communication is handled via a three-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards.

Feature Summary

• Charge-balancing ADC architecture ensures 16-bit resolution with no missing codes.
• Integrated programmable gain amplifier accepts signals directly from sensors without external conditioning.
• On-chip digital filter provides selectable notch frequencies for effective noise rejection.
• Self-calibration and system calibration options eliminate zero-scale and full-scale errors.

Applications

• Pressure measurement systems using strain gauges
• Temperature measurement with thermocouples or RTDs
• Smart industrial transmitters

Procurement Notes

Verify the specific ordering suffix matches the required voltage configuration and package type. Confirm that the component is sourced from authorized distributors to ensure authenticity. Check the revision level against the latest datasheet to confirm pinout and electrical specifications remain consistent. Ensure storage conditions comply with ESD precautions during handling.

Selection Notes

Select this component when high accuracy and low power consumption are critical. The 5 V analog supply variant is suitable for systems requiring higher input voltage ranges. Consider the available gain settings to match the expected signal amplitude from the transducer. Verify that the microcontroller interface supports the required serial communication protocol and timing constraints.

Part Context

This part belongs to the AD7715 family of complete analog front ends. It shares architectural similarities with other sigma-delta converters but is optimized for low-frequency, high-resolution measurements. The ARZ-5 designation indicates a specific voltage configuration and lead-free packaging compliant with RoHS standards.

Replacement Considerations

Direct replacements within the same family include the AD7715-3 for 3 V analog supply operation. Cross-family alternatives may require verification of pin compatibility and register mapping. Ensure any substitute maintains the 16-bit resolution and similar power consumption characteristics.

FAQ

What is the maximum master clock frequency supported by the AD7715?

The AD7715 supports a master clock frequency up to 2.4576 MHz for specified performance, with a minimum guaranteed frequency of 400 kHz.

How does the AD7715 handle input signal polarity?

The device supports both unipolar and bipolar input signal ranges. Unipolar ranges are 0 mV to 2.5 V, while bipolar ranges are ±2.5 V, referenced to the negative analog input.

Can the AD7715 operate in standby mode?

Yes, the AD7715 includes a power-down mode that reduces standby current to typically 10 µA at 5 V supplies, significantly lowering power consumption when not actively converting.