AD7787BRMZ-RL

Overview

The AD7787BRMZ-RL is a low-power, complete analog front end for low-frequency measurement applications. It integrates a 24-bit Sigma-Delta ADC with one differential input (AIN1) and one single-ended input (AIN2). The device operates from an internal clock oscillator, eliminating the need for external clock sources. It supports software-programmable output data rates ranging from 9.5 Hz to 120 Hz. Power supply voltage ranges from 2.5 V to 5.25 V. Normal mode current consumption is 75 µA maximum, while power-down mode draws 1 µA maximum. The part features rail-to-rail input buffering, simultaneous 50 Hz and 60 Hz rejection, and a VDD monitor channel.

Feature Summary

• Integrates a low-noise 24-bit Sigma-Delta modulator with configurable update rates.
• Includes a rail-to-rail input buffer to minimize gain errors from source impedances.
• Features an internal clock oscillator that simplifies system design by removing external clock requirements.
• Provides simultaneous 50 Hz and 60 Hz line frequency rejection capabilities.

Applications

• Smart transmitters
• Battery-powered instrumentation
• Portable sensor measurement systems
• Temperature and pressure measurement
• Weigh scales

Procurement Notes

Verify the specific ordering suffix RL against the manufacturer's official documentation to confirm tape-and-reel packaging status. Ensure compatibility with the required operating temperature range of -40°C to +105°C. Confirm that the MSOP-10 package dimensions align with the target PCB layout constraints before finalizing procurement decisions.

Selection Notes

Select this component when high-resolution, low-frequency signal acquisition is required in battery-operated environments. The internal clock feature reduces bill-of-materials complexity compared to devices requiring external oscillators. Evaluate the trade-off between noise performance and power consumption by adjusting the filter register settings for the desired update rate.

Part Context

The AD7787 belongs to Analog Devices' family of precision analog-to-digital converters designed for industrial sensing. It serves as a dedicated signal chain solution for applications demanding high accuracy at low speeds. The BRMZ variant indicates the commercial temperature grade and MSOP-10 surface-mount package configuration.

Replacement Considerations

Consult the official datasheet ordering guide for direct pin-compatible alternatives within the same product family. Verify functional equivalence regarding interface protocols and power specifications when considering cross-model substitutions.

FAQ

Does the AD7787 require an external clock source?

No, the device contains an internal clock oscillator, which eliminates the need for an external clock source.

What is the function of the AIN2 pin?

AIN2 serves as a single-ended analog input channel, distinct from the differential pair provided by AIN1(+)/AIN1(-).

How is the output data rate configured?

The output data rate is software programmable via the filter register, allowing selection between 9.5 Hz and 120 Hz.