Analog Devices Inc. AD7771-4BCPZ-RL

The AD7771-4BCPZ-RL is an advanced 8-channel, simultaneous sampling analog-to-digital converter (ADC) produced by Analog Devices Inc. This device features eight full Σ-Δ (sigma-delta) ADCs on-chip, each equipped with a programmable gain stage and low latency digital filters. The AD7771 is designed to provide ultralow input current, allowing for direct sensor connection, and supports both unipolar and true bipolar analog input signals. The device is highly versatile, supporting various sensor output configurations and offering fine control over the output data rate through a sample rate converter (SRC).

• Simultaneous Sampling: All eight channels sample simultaneously, ensuring accurate and synchronized data acquisition.
• Programmable Gain Stage: Each channel has a programmable gain stage with gains of 1, 2, 4, and 8, allowing for the optimization of signal chain dynamic range.
• Low Latency Digital Filters: Each channel includes a sinc3/sinc5 digital filter for high accuracy and low latency.
• Sample Rate Converter (SRC): Allows for fine control over the output data rate, ensuring coherence with line frequency changes.
• Flexible Input Configuration: Supports both differential and single-ended input signals, as well as unipolar and true bipolar analog input signals.
• Internal Reference and Buffer: Features a 2.5 V internal reference with a low temperature coefficient and reference buffer for stable operation.
• Dual Operating Modes: High resolution mode for maximum dynamic range and low power mode for reduced power consumption.
• SPI Interface: Supports SPI for configuration, control, and data transfer.
• Integrated SAR ADC for Diagnostics: A 12-bit SAR ADC for system diagnostics without compromising the Σ-Δ ADC channels.

• Industrial Automation: Suitable for precise data acquisition in industrial control systems.
• Medical Devices: Ideal for medical equipment requiring high accuracy and simultaneous sampling.
• Aerospace and Defense: Used in applications requiring high reliability and precision data conversion.
• Test and Measurement Equipment: Employed in various test and measurement instruments for accurate data acquisition.
• Automotive Systems: Applied in automotive systems that demand high precision and reliability.

1. What is the AD7771-4BCPZ-RL?

   The AD7771-4BCPZ-RL is an 8-channel, simultaneous sampling analog-to-digital converter (ADC) with eight full Σ-Δ ADCs on-chip.

2. What are the programmable gain settings of the AD7771?

   The AD7771 has programmable gain stages with gains of 1, 2, 4, and 8.

3. What types of analog input signals does the AD7771 support?

   The AD7771 supports both unipolar (0 V to VREF) and true bipolar (±VREF/2 V) analog input signals.

4. What is the operating temperature range of the AD7771?

   The specified operating temperature range is -40°C to +105°C, although the device is operational up to +125°C.

5. What is the power consumption of the AD7771 in high resolution mode?

   In high resolution mode, the AD7771 consumes 16.6 mW per channel.

6. What is the power consumption of the AD7771 in low power mode?

   In low power mode, the AD7771 consumes 5.25 mW per channel.

7. Does the AD7771 have an internal reference?

   Yes, the AD7771 features a 2.5 V internal reference with a low temperature coefficient.

8. What interface does the AD7771 use for configuration and data transfer?

   The AD7771 uses an SPI interface for configuration, control, and data transfer.

9. Does the AD7771 include any diagnostic features?

   Yes, the AD7771 includes a 12-bit SAR ADC for system diagnostics.

10. What package type is the AD7771 available in?

    The AD7771 is available in a 64-Lead LFCSP (9mm x 9mm) package.