AD7865BS-3

Overview

The AD7865BS-3 is a four-channel, simultaneous sampling, fast, 14-bit analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single +5 V supply and features a 2.4 µs successive approximation ADC architecture with four track/hold amplifiers. The device accepts bipolar analog input ranges of ±2.5 V and includes an internal 2.5 V reference and on-chip clock oscillator. It provides a high-speed parallel interface compatible with 3 V processors. Maximum throughput is 350 kSPS for a single channel and 100 kSPS across all four channels. The component is housed in a 44-lead Plastic Lead Quad Flatpack (PQFP) package.

Feature Summary

• Four simultaneously sampled inputs preserve relative phase information across channels
• Hardware or software selectable channel conversion sequences optimize throughput rates
• Integrated overvoltage protection allows analog inputs to withstand voltages up to ±18 V without damage
• Low power consumption with a dedicated standby mode reducing current draw significantly

Applications

• AC Motor Control
• Uninterruptible Power Supplies
• Industrial Power Meters/Monitors
• Data Acquisition Systems
• Communications

Procurement Notes

Verify the specific suffix 'B' indicates the improved accuracy version with ±1.5 LSB maximum integral nonlinearity compared to the standard 'A' version. Confirm the '-3' suffix corresponds to the ±2.5 V bipolar input range requirement for your signal conditioning circuitry. Ensure the 44-lead PQFP package footprint matches your PCB layout constraints before finalizing orders.

Selection Notes

Select this model when simultaneous sampling of four channels is required to maintain phase coherence. Choose the BS-3 variant specifically for applications requiring ±2.5 V input ranges with tighter accuracy specifications than the AS-3 version. Consider the external clock option if precise timing synchronization with other system components is necessary instead of relying on the internal oscillator.

Part Context

This component belongs to the AD7865 family of four-channel simultaneous sampling ADCs. The AD7865 series distinguishes itself through integrated track/old amplifiers that eliminate aperture delay mismatch between channels. The BS-3 designation represents a specific grade within the product line offering enhanced DC accuracy metrics while maintaining the core high-speed parallel interface architecture.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.