AD7761BSTZ-RL

Overview

The AD7761BSTZ-RL is an 8-channel, simultaneous sampling sigma-delta analog-to-digital converter (ADC) housed in a 64-lead LQFP package. It provides a maximum output data rate of 256 kSPS per channel with a 110.8 kHz input bandwidth and 97.7 dB dynamic range. The device features three selectable power modes: fast mode dissipates 51.5 mW per channel, median mode dissipates 27.5 mW, and low power mode dissipates 9.375 mW. It supports IOVDD voltages of 1.8 V or 2.5 V to 3.3 V, operates within a temperature range of −40°C to +105°C, and includes embedded precharge buffers for analog inputs.

Feature Summary

• Simultaneous sampling across eight channels with integrated digital filtering engines
• Configurable power scaling allowing optimization between noise performance and power consumption
• Embedded analog input precharge buffers to reduce input current requirements
• Supports daisy-chaining and CRC error checking on the data interface

Applications

• Data acquisition systems including USB, PXI, and Ethernet architectures
• Instrumentation and industrial control loops
• Audio testing and measurement equipment
• Vibration and asset condition monitoring
• High precision medical electroencephalogram (EEG), electromyography (EMG), and electrocardiogram (ECG)

Procurement Notes

Verify the specific ordering suffix against official Analog Devices documentation to confirm package type and reel specifications. Ensure that the required supply voltage levels match the AVDD1, AVDD2, and IOVDD parameters defined in the datasheet. Confirm that the operating temperature range aligns with the intended environmental conditions of the final application design.

Selection Notes

Select the appropriate power mode based on the required trade-off between input bandwidth and power dissipation. Choose between the wideband linear phase filter for frequency domain measurements or the sinc5 filter for low latency applications. Verify that the external reference voltage falls within the specified absolute input range relative to the AVDD1 supply.

Part Context

This component belongs to the AD7761 family of high-performance sigma-delta ADCs designed for multi-channel data acquisition. It serves as a platform for both low-power DC and high-performance AC measurement modules. The device integrates multiple modulators and digital filters to enable synchronized sampling of ac and dc signals across all channels simultaneously.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.