AD7716-DF

Overview

The AD7716-DF is a 22-bit sigma-delta analog-to-digital converter (ADC) designed for high-precision data acquisition systems. It features four input channels with bandwidths up to 584 Hz and offers a dynamic range of 105 dB at a 146 Hz input frequency. The device integrates a low-pass digital filter with programmable cutoff frequencies ranging from 584 Hz to 36.5 Hz, providing linear phase response. It operates on a ±5 V supply with low power consumption of 50 mW and includes an on-chip gain stage. Communication is handled via a five-line serial interface compatible with DSPs and microcomputers.

Feature Summary

• 22-bit resolution with ±0.003% integral nonlinearity
• Four-channel multiplexed input with 584 Hz bandwidth
• Programmable digital low-pass filter (36.5 Hz to 584 Hz)
• Five-line serial interface for easy DSP/microcomputer integration

Applications

• Biomedical data acquisition systems
• ECG and EEG machines
• Process control instrumentation
• High accuracy measurement devices
• Seismic monitoring systems

Procurement Notes

Verify the specific suffix 'DF' against official Analog Devices documentation to confirm package type and temperature grade. Ensure compatibility with existing board layouts regarding the five-line serial interface requirements. Confirm supply voltage specifications match the ±5 V requirement for proper operation.

Selection Notes

Select this component when 22-bit resolution and high dynamic range are critical for low-frequency signal processing. The integrated digital filter reduces the need for external analog filtering. Consider the ±5 V supply requirement and serial interface complexity compared to parallel or SPI-based alternatives if system constraints allow.

Part Context

The AD7716 belongs to Analog Devices' LC2MOS family of precision data acquisition converters. It is part of a series that includes variants like the AD7716BP and AD7716BS, which share core functional specifications but may differ in package style or industrial temperature ratings. The device is designed to replace older discrete solutions in high-accuracy applications.

Replacement Considerations

Direct replacements within the same family include AD7716BP and AD7716BS. Verify pinout and electrical characteristics before substitution. Higher-resolution or faster-speed ADCs from other manufacturers may require significant circuit redesign due to interface and supply voltage differences.