AD7768-1BCPZ-RL

Overview

The AD7768-1BCPZ-RL is a single-channel, 24-bit Sigma-Delta analog-to-digital converter (ADC) from Analog Devices Inc., housed in a 28-lead LFCSP package. It supports output data rates up to 1024 kSPS using the sinc5 filter and 256 kSPS with the low ripple FIR filter. The device delivers a typical dynamic range of 108.5 dB and achieves −120 dB total harmonic distortion. Key accuracy specifications include ±1.1 ppm integral nonlinearity, ±30 µV offset error, and ±30 ppm gain error. Power consumption ranges from 6.75 mW in low power mode to 36.8 mW in fast mode with the FIR filter. It operates on AVDD1 (5.0 V), AVDD2 (2.0 V to 5.0 V), and IOVDD (1.8 V to 3.3 V) supplies.

Feature Summary

• Configurable digital filtering options including low ripple FIR, low latency sinc5, and programmable sinc3 filters for precise AC and DC signal conversion.
• Programmable power scaling across three modes (Fast, Median, Low Power) to optimize the trade-off between input bandwidth and power dissipation.
• Integrated diagnostic mechanisms featuring temperature monitoring, interface CRC checks, and memory map verification for system reliability.
• Flexible control interface supporting both pin control mode and SPI configuration for adaptable integration into various data acquisition architectures.

Applications

• Platform ADC for modular data acquisition systems including USB, PXI, and Ethernet-based designs.
• Clinical vital signs monitoring such as electroencephalogram (EEG), electromyogram (EMG), and electrocardiogram (ECG).
• Sound, vibration, acoustic analysis, and material science research and development.
• Condition monitoring for predictive maintenance and electrical test and measurement equipment.

Procurement Notes

Verify the specific ordering suffix BCPZ-RL against the manufacturer's current datasheet to confirm package type and reel quantity. Ensure supply voltage requirements match the application design, particularly the AVDD1 and AVDD2 rails. Confirm that the external reference voltage falls within the specified 1 V to AVDD1 range. Check for any recent revision changes in the documentation that might affect timing or register configurations.

Selection Notes

Select this component when a single-channel, high-precision ADC with flexible power-bandwidth trade-offs is required. The choice depends on whether the application prioritizes the wide bandwidth of the sinc5 filter or the precision of the FIR filter. Consider the available power budget to determine the appropriate operating mode. Ensure the host system can support the required SPI interface speeds and that an external reference voltage source is available within the specified limits.

Part Context

The AD7768-1 is the single-channel variant of the AD7768, which features eight simultaneously sampling channels. Both devices share the same core architecture, digital filtering capabilities, and power scaling features. The AD7768-1 provides a reusable footprint for instrumentation designers, allowing them to utilize the same platform for various measurement variants in isolated and non-isolated applications without redesigning the data acquisition foundation.

Replacement Considerations

The AD7768 is the multi-channel counterpart offering simultaneous sampling capabilities. For direct functional substitution in single-channel designs, verify pin compatibility and register mapping. No other specific substitute part numbers are confirmed in the provided documentation.