AD7824LN

Overview

The AD7824LN is a high-speed, multichannel, 8-bit analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features four multiplexed analog input channels and utilizes a half-flash conversion technique to achieve a fast conversion rate of 2.5 µs per channel. The device incorporates a built-in track-and-hold function capable of digitizing full-scale signals up to 10 kHz with a slew rate of 157 mV/µs. Operating from a single 5 V supply, it consumes typical power of 50 mW. The total unadjusted error is specified at ±1/2 LSB for the L version, ensuring tight accuracy without requiring user trims. It interfaces directly with microprocessors using standard Chip Select and Read signals.

Feature Summary

• Half-flash conversion architecture provides rapid data acquisition without external clock generation.
• Integrated track-and-hold circuitry enables direct handling of high-frequency analog inputs.
• Single 5 V supply operation simplifies system power requirements and design complexity.
• Tight error specifications eliminate the need for manual calibration or user trims.

Applications

• High-speed data acquisition systems requiring multi-channel signal processing
• Industrial process control applications involving sensor signal digitization
• Microprocessor-based instrumentation systems needing fast analog input scanning

Procurement Notes

Verify the specific ordering suffix 'LN' corresponds to the commercial temperature range (0°C to 70°C) and ±1/2 LSB total unadjusted error specification as defined in the official Analog Devices ordering guide. Confirm package compatibility with the N-24 plastic dual-in-line format before integration into existing board layouts.

Selection Notes

Select the AD7824LN when four analog channels are sufficient for the application design. Choose this variant over the AD7828 if eight channels are not required, as it offers a smaller footprint. Ensure the system operates within the commercial temperature limits and requires the tighter ±1/2 LSB error specification provided by the L grade.

Part Context

The AD7824LN belongs to the AD7824/AD7828 family of LC2MOS high-speed ADCs. This series is designed for applications demanding fast sampling rates and low power consumption. The LN designation specifically identifies the component with commercial temperature ratings and enhanced accuracy compared to the standard K version.

Replacement Considerations

The AD7824KN serves as a direct functional substitute with identical pinout and electrical characteristics, differing only in the total unadjusted error specification of ±1 LSB instead of ±1/2 LSB.