AD7824LNZ

Overview

The AD7824LNZ is an 8-bit, 4-channel analog-to-digital converter utilizing a half-flash architecture. It operates from a single 5 V supply with a typical power dissipation of 50 mW. The device features a built-in track-and-hold function capable of handling signals up to 10 kHz. Conversion time is 2.5 µs per channel, supporting a sampling rate of 100 kS/s. Total unadjusted error is ±1/2 LSB. It uses a parallel interface and is housed in a 24-lead PDIP package.

Feature Summary

• Half-flash conversion technique eliminates the need for an external clock signal.
• Built-in track-and-hold function allows direct digitization of full-scale signals up to 10 kHz.
• Simple microprocessor interfacing using standard Chip Select and Read signals.
• Tight error specification and channel-to-channel matching eliminate the need for user trims.

Applications

• High-speed closed-loop systems
• Battery-powered instruments
• High-speed data acquisition systems

Procurement Notes

Verify the specific suffix 'LN' indicates the commercial temperature range (0°C to +70°C) and ±1/2 LSB total unadjusted error tolerance as defined in the Analog Devices ordering guide. Confirm the N-24 package option corresponds to the 24-lead skinny DIP format. Ensure the component source matches the manufacturer's specifications for LC2MOS process technology.

Selection Notes

Select this model when four multiplexed channels are required with high-speed conversion capabilities. The half-flash architecture provides fast throughput without external clocking. Verify that the single 5 V supply requirement aligns with system power constraints. Consider the ±1/2 LSB accuracy if tight error specifications are necessary without user calibration.

Part Context

The AD7824 is part of the AD7824/AD7828 family of high-speed, multichannel ADCs. While the AD7824 offers four channels, the AD7828 variant provides eight channels. Both share the same LC2MOS fabrication process and half-flash conversion technique. The LN suffix denotes the commercial temperature grade with improved accuracy compared to the KN version.

Replacement Considerations

Public confirmed substitutes include the AD7824KN for standard accuracy or the AD7824CQ for industrial temperature range operation. The MX7824KCWG+ is a related high-speed ADC but utilizes SPI interface and SOIC packaging, requiring significant circuit redesign.