AD7761BSTZ

Overview

The AD7761BSTZ is an 8-channel, simultaneous sampling sigma-delta analog-to-digital converter with a 16-bit resolution and 256 kSPS maximum output data rate per channel. It achieves 97.7 dB dynamic range at a 110.8 kHz input bandwidth. The device features three selectable power modes: fast (51.5 mW/channel), median (27.5 mW/channel), and low power (9.375 mW/channel). It includes embedded analog precharge buffers, offset/gain correction registers, and supports CRC error checking on the data interface. Operating temperatures range from -40°C to +105°C in a 64-lead LQFP package.

Feature Summary

• Simultaneous sampling across eight independent channels for synchronized signal acquisition.
• Configurable digital filtering options including wideband linear phase and low latency sinc5 filters.
• Integrated analog input precharge buffers to reduce input current requirements.
• Supports daisy-chaining and includes cyclic redundancy check (CRC) error verification.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm pin compatibility and packaging details. Ensure that the required supply voltages align with the AVDD1, AVDD2, and IOVDD specifications before integration. Confirm availability status through authorized distributors as stock levels may fluctuate.

Selection Notes

Select the appropriate power mode based on the required balance between noise performance and power dissipation. Choose between the wideband filter for frequency domain analysis or the sinc5 filter for low-latency applications. Verify that the external reference voltage falls within the specified 1 V to AVDD1 range and that the master clock frequency supports the desired decimation rates.

Part Context

This component belongs to the Analog Devices AD7761 family of high-performance sigma-delta ADCs. It is designed for applications requiring precise simultaneous sampling of multiple signals. The device integrates digital filtering and calibration capabilities to simplify system design while maintaining high accuracy across varying operating conditions.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Evaluate alternative devices based on channel count, resolution, and sampling rate requirements if direct replacement is necessary.

FAQ

What are the three operational power modes?

The AD7761 offers Fast mode (256 kSPS, 110.8 kHz BW), Median mode (128 kSPS, 55.4 kHz BW), and Low Power mode (32 kSPS, 13.8 kHz BW).

How does the device handle data integrity?

The AD7761 supports cyclic redundancy check (CRC) error checking on the data interface to ensure accurate data transmission.

What is the function of the analog input precharge buffers?

The precharge buffers reduce the analog input current drawn by the ADC and minimize glitches on the reference input terminals.