AD7716BP

Overview

The AD7716BP is a 22-bit sigma-delta analog-to-digital converter featuring four independent input channels. It operates with a ±5 V supply and supports an 8 MHz clock input, achieving a sampling rate of 570 kHz. The device provides a usable dynamic range from 99 dB at 584 Hz to 111 dB at 36.5 Hz bandwidth. It includes an on-chip low-pass digital filter with programmable cutoff frequencies and interfaces via a five-line serial port. The component is housed in a 44-pin PLCC package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Four-channel simultaneous data acquisition using sigma-delta technology
• Integrated low-pass digital filter with software-programmable cutoff frequencies
• Five-line serial interface for easy connection to microcomputers and DSPs
• Cascading capability through dedicated CASCIN and CASCOUT pins

Applications

• Biomedical data acquisition systems
• ECG machines
• EEG machines
• Process control instrumentation
• Seismic systems

Procurement Notes

Verify the specific ordering suffix 'P' corresponds to the 44-lead Plastic Leaded Chip Carrier (PLCC) package variant. Confirm that the B version designation aligns with the required industrial operating temperature range of -40°C to +85°C. Ensure the external reference voltage meets the specified minimum and maximum limits for proper operation.

Selection Notes

Select this component when high-resolution measurement of low-frequency signals is required. The internal digital filtering reduces system complexity by eliminating the need for extensive external analog filters. Consider the settling time associated with lower bandwidth settings if rapid channel switching is necessary. Verify that the power supply architecture supports the dual ±5 V requirement.

Part Context

The AD7716 belongs to Analog Devices' LC2MOS data acquisition family, designed for precision signal processing. The BP suffix specifically denotes the PLCC package option within the broader AD7716 series, which also includes PQFP variants. This part integrates modulators and digital filters to simplify the design of multi-channel acquisition systems.

Replacement Considerations

The AD7716BS serves as a direct functional alternative utilizing a 44-pin PQFP package instead of PLCC. Other members of the AD771x family may offer different channel counts or resolutions but require verification of pin compatibility and register mapping.