AD7768-1BCPZ-RL7

Overview

The AD7768-1BCPZ-RL7 is a single-channel, 24-bit sigma-delta analog-to-digital converter (ADC) housed in a 28-lead, 4 mm × 5 mm LFCSP package. It supports output data rates up to 1.024 MSPS using the sinc5 filter and up to 256 kSPS with the low ripple FIR filter. The device provides a typical dynamic range of 108.5 dB and total harmonic distortion of −120 dB. Power consumption ranges from 6.75 mW in low power mode to 36.8 mW in fast mode with the FIR filter. It operates with AVDD1 at 5.0 V, AVDD2 between 2.0 V and 5.0 V, and IOVDD between 1.8 V and 3.3 V.

Feature Summary

• Configurable digital filtering options including low ripple FIR, low latency sinc5, and programmable sinc3 filters for various bandwidth and latency requirements.
• Integrated precharge buffers on analog inputs and reference pins to reduce external drive current requirements.
• Programmable power scaling across three modes (fast, median, low power) to optimize the trade-off between input bandwidth and power dissipation.
• Embedded diagnostic mechanisms including temperature monitoring, interface CRC, and memory map CRC checks.

Applications

• Platform ADC for general-purpose data acquisition systems
• Sound, vibration, and acoustic measurement research
• Clinical vital signs monitoring such as EEG, EMG, and ECG
• Condition monitoring for predictive maintenance
• Modular DAQ designs including USB, PXI, and Ethernet-based systems

Procurement Notes

Verify the specific ordering suffix RL7 corresponds to the tape and reel packaging configuration required for automated assembly processes. Confirm that the BC grade designation meets the specified accuracy and performance criteria for the intended application environment. Ensure compatibility with the 28-lead LFCSP footprint during PCB layout verification.

Selection Notes

Select this component when a single-channel, high-resolution ADC with flexible power-bandwidth trade-offs is required. The availability of multiple digital filter types allows optimization for either control loop latency or precision frequency domain analysis. Consider the integrated analog buffers if minimizing external driver complexity is a priority.

Part Context

The AD7768-1 serves as the single-channel variant within the AD7768 family, which includes multi-channel simultaneous sampling models. It shares the same core architecture and pinout compatibility, allowing designers to utilize a unified footprint for scalable data acquisition modules ranging from single-channel sensors to multi-channel isolated systems.

Replacement Considerations

Direct functional replacements include other single-channel 24-bit sigma-delta ADCs from Analog Devices such as the AD7766 or AD7767, provided they meet the specific bandwidth and power constraints. Verify pin compatibility and register mapping if substituting with devices from other manufacturers offering similar architectural features.