AD7787BRMZ

Overview

The AD7787BRMZ is a low power, complete analog front end for low frequency measurement applications. It contains a low noise 24-bit Sigma-Delta ADC with one differential input and one single-ended input that can be buffered or unbuffered. The device operates from an internal clock, eliminating the need for an external clock source. The output data rate is software programmable from 9.5 Hz to 120 Hz. It features simultaneous 50 Hz and 60 Hz rejection, rail-to-rail input buffer, and VDD monitor channel. Operating voltage ranges from 2.5 V to 5.25 V. Normal mode current is 75 µA max, while power-down mode draws 1 µA max. RMS noise is 1.1 µV at 9.5 Hz update rate. Resolution is 19.5 bits peak-to-peak (22 bits effective). Integral nonlinearity is ±15 ppm of FSR max. Offset error is ±3 µV typ. Full-scale error is ±10 µV typ. Temperature range is −40°C to +105°C. Package is 10-lead MSOP.

Feature Summary

• Low power operation with normal mode current up to 75 µA and power-down mode current up to 1 µA
• Internal clock oscillator eliminates requirement for external clock source
• Software programmable output data rates ranging from 9.5 Hz to 120 Hz
• Simultaneous 50 Hz and 60 Hz line frequency rejection capabilities

Applications

• Smart transmitters
• Battery powered applications
• Portable instrumentation
• Sensor measurement systems
• Temperature and pressure measurement
• Weigh scales
• 4 to 20 mA loops

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or direct manufacturer channels. Confirm package marking matches the 10-lead MSOP specification. Check datasheet revision A for updated specifications. Ensure environmental compliance documentation aligns with project requirements. Validate lot traceability if required for critical applications.

Selection Notes

Select this component when low power consumption and high resolution are required for low frequency measurements. Consider the internal clock feature if external clock generation is undesirable. Evaluate the dual input configuration for mixed differential and single-ended signal acquisition. Verify supply voltage compatibility within the 2.5 V to 5.25 V range. Assess thermal performance within the specified operating temperature limits.

Part Context

The AD7787 belongs to Analog Devices' family of low power sigma-delta analog-to-digital converters. It is designed specifically for precision measurement applications requiring minimal power consumption. The device integrates a complete analog front end including the modulator, filter, and serial interface logic. It targets industrial and portable instrumentation markets where battery life and accuracy are critical design constraints.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.