AD7768-1BCPZ

Overview

The AD7768-1BCPZ 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 achieves a typical dynamic range of 108.5 dB at 256 kSPS with an input bandwidth of 110.8 kHz. Key accuracy specifications include ±1.1 ppm integral nonlinearity (INL), ±30 µV offset error, and ±30 ppm gain error. Power consumption varies by mode: 36.8 mW in fast mode with the FIR filter, 19.7 mW in median mode, and 6.75 mW in low power mode.

Feature Summary

• Configurable digital filtering options including low ripple FIR, low latency sinc5, and programmable sinc3 filters for specific frequency rejection requirements.
• Integrated precharge buffers on analog inputs and reference terminals to reduce external drive current requirements.
• Three selectable power modes allowing optimization between input bandwidth, output data rate, and power dissipation.
• Built-in diagnostic mechanisms including temperature monitoring, interface CRC checks, and memory map verification.

Applications

• Sound and vibration monitoring
• Electrical power quality analysis
• Condition-based monitoring for predictive maintenance
• Clinical vital signs monitoring (EEG, EMG, ECG)
• Modular data acquisition systems

Procurement Notes

Verify the component grade and revision against the ordering guide to ensure compatibility with system requirements. Confirm that the 28-lead LFCSP package dimensions match the PCB footprint design. Ensure the external reference voltage falls within the specified 1 V to AVDD1 range. Check operating temperature ratings if the application environment exceeds standard industrial limits.

Selection Notes

Select the AD7768-1BCPZ when a single-channel high-performance ADC is required for precision AC and DC signal conversion. Choose this part over multi-channel variants if only one measurement channel is needed. Consider the available power modes to balance noise performance against thermal constraints. Verify that the required decimation rates align with the desired output data rate and latency specifications.

Part Context

The AD7768-1BCPZ is the single-channel version of the AD7768 family, which includes 4-channel and 8-channel simultaneous sampling variants. It shares the same core architecture, digital filtering capabilities, and power scaling features as its multi-channel counterparts. This allows designers to use a consistent platform across different measurement configurations while adapting the channel count to specific application needs.

Replacement Considerations

Direct functional replacements within the same family include the AD7768 (8-channel) and AD7768-4 (4-channel). For applications requiring higher channel counts or simultaneous sampling, these variants offer pin-compatible architectural similarities but differ in channel configuration and package size.