Overview
The AD7771BCPZ, produced by Analog Devices Inc., is an 8-channel, simultaneous sampling analog-to-digital converter (ADC) designed for high-performance applications. It features eight on-chip Σ-Δ ADCs, each with a programmable gain stage to maximize the dynamic range of the signal chain. The device is optimized for direct sensor connection with ultralow input current and includes a sample rate converter (SRC) for fine resolution control over the output data rate. The AD7771BCPZ operates in two modes: high resolution mode and low power mode, catering to different application requirements.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 8 |
| ADC Type | Σ-Δ ADC |
| Programmable Gain | 1, 2, 4, 8 |
| Sample Rate Converter | Programmable via SPI |
| Interfaces | Data Output Interface, SPI Control Interface |
| Additional ADC | 12-bit SAR ADC for diagnostics |
| Reference Voltage | 2.5 V with ±10 ppm/°C temperature coefficient |
| Operating Modes | High Resolution Mode, Low Power Mode |
| Power Consumption (per channel) | High Resolution Mode: 16.6 mW, Low Power Mode: 5.25 mW |
| Operating Temperature Range | −40°C to +105°C (operational up to +125°C) |
| Package | 64-Lead LFCSP (9mm x 9mm w/ EP) |
Key Features
- Simultaneous sampling of all 8 channels
- Programmable gain stages for each channel to optimize dynamic range
- Sample rate converter for fine control over output data rate
- Dual operating modes: high resolution and low power
- 12-bit SAR ADC for diagnostics and functional safety validation
- Internal multiplexer for sensing internal nodes
- General-purpose input/output pins (GPIOs) for external multiplexer control
- SPI interface for configuration and data control
Applications
The AD7771BCPZ is suitable for various high-performance applications, including industrial process control, medical devices, and precision measurement systems. Its ability to handle multiple channels simultaneously makes it ideal for applications requiring synchronized data acquisition. The device is also useful in environments where functional safety is critical, leveraging the 12-bit SAR ADC for validation purposes.
Q & A
- What is the primary function of the AD7771BCPZ?
The AD7771BCPZ is an 8-channel, simultaneous sampling analog-to-digital converter (ADC). - What are the programmable gain options for each channel?
The programmable gain options are 1, 2, 4, and 8. - How is the sample rate controlled?
The sample rate is controlled using a programmable sample rate converter (SRC) via the SPI interface. - What additional ADC is included for diagnostics?
A 12-bit SAR ADC is included for diagnostics and functional safety validation. - What are the operating modes of the AD7771BCPZ?
The device operates in high resolution mode and low power mode. - What is the power consumption per channel in each mode?
In high resolution mode, it is 16.6 mW per channel, and in low power mode, it is 5.25 mW per channel. - What is the operating temperature range of the AD7771BCPZ?
The operating temperature range is −40°C to +105°C, although it is operational up to +125°C. - What package type is the AD7771BCPZ available in?
The AD7771BCPZ is available in a 64-Lead LFCSP (9mm x 9mm w/ EP) package. - How is the device configured and controlled?
The device is configured and controlled using the SPI interface. - What is the purpose of the general-purpose input/output pins (GPIOs)?
The GPIOs are used to control an external multiplexer for signal conditioning and validation.
