AD7862ARZ-2

Overview

The AD7862ARZ-2 is a dual 12-bit successive approximation analog-to-digital converter (ADC) operating from a single +5 V supply. It features two simultaneous sampling channels with four total analog inputs, supporting an input range of 0 V to +2.5 V. The device achieves a throughput rate of 250 kSPS with a conversion time of 3.6 μs and consumes typically 60 mW. Key specifications include a signal-to-noise ratio of 70 dB minimum, ±1 LSB differential nonlinearity, and ±4 LSB gain error. It utilizes a high-speed parallel interface and includes overvoltage protection up to +7 V.

Feature Summary

• Simultaneous sampling and conversion of two independent channels preserves relative phase information between signals.
• Integrated internal +2.5 V reference eliminates the need for external voltage references in standard applications.
• High-speed parallel data bus allows direct connection to microprocessors and digital signal processors.
• Automatic power-down mode reduces power consumption significantly after each conversion cycle.

Applications

• AC motor control systems requiring precise phase tracking
• Uninterrupted power supplies (UPS) monitoring
• Data acquisition systems with multi-channel requirements
• Communications equipment signal processing

Procurement Notes

Verify the specific suffix '-2' confirms the 0 V to +2.5 V unipolar input range, as other suffixes like '-10' or '-3' support different voltage ranges. Confirm package type matches design requirements, as the 'R' suffix indicates SOIC-28. Check for moisture sensitivity level (MSL 3) handling requirements during assembly. Ensure ESD precautions are followed due to device sensitivity.

Selection Notes

Select the AD7862ARZ-2 when simultaneous sampling of two channels is required within a 0 V to +2.5 V input window. Compare against the AD7863 for higher resolution needs or the AD7862-10/AD7862-3 if bipolar input ranges are necessary. Consider the parallel interface complexity versus serial alternatives if pin count is constrained. Evaluate power dissipation limits in thermal-sensitive environments.

Part Context

The AD7862 belongs to Analog Devices' family of high-speed, low-power dual ADCs. It is fabricated using Linear Compatible CMOS (LC2MOS) process technology. The device is available in multiple packages including SOIC, SSOP, and DIP. It serves as a cost-effective solution for applications needing dual-channel performance without the complexity of discrete components.

Replacement Considerations

The AD7863 is a 14-bit pin-compatible upgrade option offering higher resolution. For bipolar input ranges, consider the AD7862-10 (±10 V) or AD7862-3 (±2.5 V). Serial interface alternatives may be considered if parallel bus resources are limited, though they differ in interface architecture.