AD7862ARS-3REEL

Overview

The AD7862ARS-3REEL is a dual 12-bit successive approximation analog-to-digital converter (ADC) fabricated in the LC2MOS process. It features two simultaneous sampling channels with four analog inputs grouped into Channel A and Channel B, selected via the A0 pin. The device operates from a single +5 V supply, consuming 60 mW typically in normal mode and 50 mW in power-saving mode. It provides an input voltage range of ±2.5 V with overvoltage protection up to ±7 V. Key electrical parameters include a maximum conversion time of 3.6 μs, a throughput rate of 250 kSPS, and a signal-to-noise ratio of 70 dB minimum at 25°C. The part utilizes a high-speed parallel interface for data readout.

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 precision voltage sources in standard configurations.
• Automatic power-down mode reduces average power consumption by entering standby immediately after conversion completion.
• High-speed parallel interface allows direct connection to microprocessors and digital signal processors.

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 that the REEL suffix indicates tape-and-reel packaging rather than tube packaging when sourcing components. Confirm the -3 designation corresponds to the ±2.5 V input range variant. Ensure the ARS package type matches the required shrink small outline footprint for the target PCB layout. Check manufacturing date codes against project lifecycle requirements.

Selection Notes

Select this variant specifically for applications requiring a ±2.5 V bipolar input range. Choose the ARS package only if the board layout supports the shrink small outline dimensions. Consider the AD7863 if 14-bit resolution is necessary, as it is pin-compatible. Evaluate the 250 kSPS throughput against system bandwidth requirements to ensure adequate sampling rates.

Part Context

The AD7862 belongs to Analog Devices' family of high-speed, low-power dual ADCs. The AD7862ARS-3REEL is the extended temperature (-55°C to +125°C) version housed in a 28-lead SSOP package and supplied in reel format. It serves as a cost-effective solution for applications needing simultaneous sampling without the complexity of external track/hold amplifiers.

Replacement Considerations

The AD7862BR-3Z is a pin-compatible alternative with commercial temperature specifications. For higher resolution needs, the AD7863 offers 14-bit performance while maintaining the same package and interface compatibility.