AD7715ANZ-3

Overview

The AD7715ANZ-3 is a complete analog front end for low frequency measurement applications, featuring a 16-bit Sigma-Delta ADC with no missing codes. It operates from a single 3 V supply and includes a programmable gain front end with gains of 1, 2, 32, and 128. The device supports differential inputs and offers a three-wire serial interface compatible with SPI, QSPI, Microwire, and DSP systems. Key specifications include ±0.0015% integral nonlinearity, a maximum supply current of 450 µA at 3 V, and an operating temperature range of -40°C to +85°C. It utilizes a 16-lead PDIP package.

Feature Summary

• Integrates a charge-balancing ADC with a proprietary programmable gain front end based on an analog modulator.
• Features an on-chip digital filter with a programmable first notch for adjusting cutoff frequencies and output update rates.
• Includes self-calibration and system calibration options to eliminate gain and offset errors.
• Supports unipolar and bipolar input signal ranges directly from transducers without external signal conditioning.

Applications

• Smart transmitters
• Pressure measurement systems
• Temperature measurement applications

Procurement Notes

Verify the specific voltage variant suffix when ordering. The AD7715ANZ-3 designation indicates a 3 V operation capability, distinct from the 5 V version. Confirm package type and temperature grade match project requirements before procurement.

Selection Notes

Select this component for single-channel, low-speed applications requiring high precision and low power consumption. Ensure the master clock frequency aligns with the desired output data rate and filter characteristics. Verify that the available reference voltage meets the required input span for the selected gain setting.

Part Context

This part belongs to the AD7715 family of low-frequency analog front ends manufactured by Analog Devices. It is designed to replace discrete signal conditioning circuits in measurement systems, offering integrated amplification, filtering, and conversion capabilities in a single CMOS package.

Replacement Considerations

The AD7715ARZ-3 serves as a surface-mount replacement option within the same functional family. Both variants share identical electrical specifications and pinouts, differing only in the physical package style (PDIP versus SOIC).

FAQ

What are the available gain settings for the programmable front end?

The AD7715 provides four selectable gain settings: 1, 2, 32, and 128.

How does the device handle calibration?

The part contains on-chip registers allowing software control over self-calibration and system calibration modes to remove zero-scale and full-scale errors.

What is the maximum supply current at 3 V operation?

The total supply current is less than 450 µA when operating with a 3 V supply and a 1 MHz master clock.