AD7821KPZ-REEL

Overview

The AD7821KPZ-REEL is an 8-bit analog-to-digital converter utilizing a half-flash conversion technique. It features a maximum conversion time of 660 ns and supports a sampling rate up to 1 MHz. The device operates from a single +5 V supply for unipolar inputs or dual ±5 V supplies for bipolar ranges. Key electrical parameters include a signal-to-noise ratio of 45 dB, total unadjusted error of ±1 LSB, and power dissipation of 50 mW. It employs a Skinny 20-Lead Plastic Leaded Chip Carrier (PLCC) package.

Feature Summary

• Built-in track-and-hold function supporting input signals up to 100 kHz without external components
• Half-flash architecture eliminating the need for an external clock signal
• Flexible reference inputs enabling both unipolar and bipolar operation modes
• Three-state data outputs compatible with standard microprocessor control signals

Applications

• Digital signal processing systems requiring high-speed sampling
• Voice recognition and echo cancellation circuits
• Adaptive filtering applications
• High-speed data acquisition systems

Procurement Notes

Verify the specific suffix KPZ corresponds to the Plastic Leaded Chip Carrier package and reel packaging configuration. Confirm that the K version temperature range meets the operational requirements. Ensure the ordering documentation matches the exact part number to avoid discrepancies in pinout or performance specifications.

Selection Notes

Select this component when an 8-bit resolution with 1 MHz throughput is required. The built-in track-and-hold simplifies design by removing external hold amplifiers. Consider the PLCC package constraints for board layout. Verify interface compatibility with the target microprocessor's read/write cycles.

Part Context

This model belongs to the AD7821 series, which offers improved performance over the AD7820. It utilizes Linear Compatible CMOS technology to combine precision bipolar circuits with low power CMOS logic. The series is designed for applications demanding fast conversion times and low power consumption.

Replacement Considerations

The AD7820 is a comparable device within the same family but exhibits slower conversion times and lower bandwidth. Verify functional equivalence regarding interface timing and power supply requirements before substitution.