AD7768-4BSTZ-RL

Overview

The AD7768-4BSTZ-RL is a 24-bit, 4-channel simultaneous sampling sigma-delta analog-to-digital converter (ADC) from Analog Devices Inc. It features a maximum output data rate of 256 kSPS per channel and supports input bandwidths up to 110.8 kHz. The device provides 108 dB dynamic range with typical integral nonlinearity of ±2 ppm, offset error of ±50 µV, and gain error of ±30 ppm. It operates with AVDD1 at 5.0 V, AVDD2 between 2.25 V and 5.0 V, and IOVDD at 1.8 V or 2.5 V to 3.3 V. Packaged in a 64-lead LQFP, it functions within a temperature range of -40°C to +105°C.

Feature Summary

• Simultaneous sampling across four channels ensures time-coherent acquisition for multi-sensor applications.
• Integrated digital filters include wideband linear phase and low-latency sinc5 options for flexible signal processing.
• Power scaling allows optimization of noise performance against power consumption through selectable speed modes.
• Built-in precharge buffers on analog inputs and reference terminals reduce input current and glitches.

Applications

• Data acquisition systems including USB, PXI, and Ethernet interfaces
• High precision medical electroencephalogram (EEG), electromyography (EMG), and electrocardiogram (ECG)
• Vibration and asset condition monitoring
• Audio testing and measurement equipment

Procurement Notes

Verify the specific ordering suffix BSTZ-RL against the manufacturer's official documentation to confirm package type and reel quantity specifications. Ensure that the component matches the required voltage levels and temperature ratings for the intended application environment before finalizing procurement orders.

Selection Notes

Select this component when simultaneous multi-channel sampling is required to maintain phase coherence. Evaluate the trade-off between input bandwidth and power dissipation using the three available operating modes. Confirm compatibility with external clock sources and reference voltages to ensure optimal dynamic performance.

Part Context

This part belongs to the AD7768 family, which includes an 8-channel variant. Both versions share identical core architecture, featuring independent sigma-delta modulators and digital filters per channel. The AD7768-4 specifically offers four channels in a 64-lead LQFP package, suitable for applications requiring fewer synchronized inputs than the full eight-channel model.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pinout and register compatibility if considering alternative high-resolution ADCs from other manufacturers.