AD7864ASZ-1

Overview

The AD7864ASZ-1 is a high-speed, low-power, four-channel simultaneous sampling 12-bit analog-to-digital converter (ADC) operating from a single 5 V supply. It features four track-and-hold amplifiers and a successive approximation ADC with a conversion time of 1.65 μs per channel. The device supports ±10 V and ±5 V bipolar input voltage ranges. It includes an internal 2.5 V reference, on-chip clock oscillator, and signal conditioning circuitry. The part utilizes a high-speed parallel interface compatible with 3 V processors and offers hardware or software selectable channel sequences to maximize throughput.

Feature Summary

• Four simultaneously sampled inputs preserve relative phase information across channels
• Hardware or software selectable channel sequence for optimized throughput
• Integrated 2.5 V reference and on-chip clock oscillator
• Overvoltage protection on analog inputs

Applications

• AC motor control
• Uninterrupted power supplies
• Data acquisition systems
• Communications

Procurement Notes

Verify the specific suffix 'A' indicates the commercial temperature range (-40°C to +85°C). Confirm the '-1' variant designation corresponds to the ±10 V and ±5 V input range specifications. Ensure the package type matches the required MQFP-44 footprint for your PCB layout. Cross-reference the datasheet revision to confirm timing characteristics align with your system requirements.

Selection Notes

Select this component when simultaneous multi-channel sampling is critical for maintaining signal phase relationships. The AD7864-1 variant is appropriate for standard industrial applications requiring ±10 V or ±5 V input ranges. Consider the 90 mW typical power consumption for portable designs. Evaluate the parallel interface speed against your processor's data bus capabilities to ensure adequate throughput rates.

Part Context

The AD7864 belongs to Analog Devices' family of high-speed, simultaneous sampling ADCs. The ASZ-1 designation specifies the commercial temperature grade and the specific bipolar input range version. This series is designed for applications demanding precise synchronization between multiple analog channels without external multiplexing delays.

Replacement Considerations

The AD7864ASZ-2 and AD7864ASZ-3 are functionally similar but feature different input voltage ranges (unipolar and ±2.5 V respectively). Verify that the input signal levels match the selected variant's range before substitution.