AD7862BRZ-3

Overview

The AD7862BRZ-3 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 analog inputs grouped into Channel A and Channel B, selectable via the A0 pin. The device provides a throughput rate of 250 kSPS with a conversion time of 3.6 μs and an acquisition time of 0.3 μs. It accepts an analog input range of ±2.5 V and includes overvoltage protection up to ±7 V. Key specifications include a signal-to-noise ratio of 70 dB minimum, differential nonlinearity of ±1 LSB, and typical power dissipation of 60 mW in normal mode.

Feature Summary

• Simultaneous sampling and conversion of two independent channels preserves relative phase information between input signals.
• Integrated internal +2.5 V reference eliminates the need for external voltage references in standard applications.
• High-speed parallel interface 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
• Uninterrupted power supplies (UPS)
• Data acquisition systems
• Communications equipment

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the analog input range specification corresponds to the '-3' variant for ±2.5 V operation. Ensure compatibility with the system's logic voltage levels and timing requirements before finalizing procurement.

Selection Notes

Select this component when simultaneous sampling of two channels is required within a single package. The AD7862BRZ-3 is suitable for applications needing a ±2.5 V input range. Consider the AD7863 if a 14-bit resolution upgrade is necessary while maintaining pin compatibility.

Part Context

The AD7862 belongs to Analog Devices' family of high-speed, low-power dual ADCs. It utilizes LC2MOS technology to combine precision bipolar circuits with low-power CMOS logic. The BRZ-3 designation indicates a commercial temperature range (-40°C to +85°C), RoHS compliance, and a 28-lead SOIC package.

Replacement Considerations

The AD7863 serves as a 14-bit pin-compatible upgrade option. Other variants within the AD7862 series offer different input ranges or packaging options but share the same core functionality.