AD7824UQ

Overview

The AD7824UQ is an 8-bit, 4-channel analog-to-digital converter from Analog Devices. It utilizes a half-flash conversion technique with a built-in track-and-hold function, achieving a fast conversion rate of 2.5 µs per channel and supporting signal handling up to 10 kHz. The device operates on a single 5 V supply with low power dissipation of 50 mW typ. It features a tight total unadjusted error specification of ±1/2 LSB max for the U version. The part is housed in a Q-24 package and supports an extended operating temperature range from -55°C to +125°C.

Feature Summary

• Half-flash conversion architecture eliminates the need for an external clock signal.
• Built-in track-and-hold function enables direct digitization of high-speed signals without external sampling hardware.
• Simple microprocessor interface using standard Chip Select and Read signals for easy integration.

Applications

• High-speed multichannel data acquisition systems
• Industrial process control monitoring
• Speech analysis and real-time filtering applications

Procurement Notes

Verify the specific ordering suffix 'UQ' against current manufacturer documentation to confirm the extended temperature grade (-55°C to +125°C) and ±1/2 LSB accuracy. Confirm the Q-24 package availability and lead times directly with Analog Devices or authorized distributors, as supply status may vary.

Selection Notes

Select the AD7824UQ when an 8-bit resolution and 4-channel multiplexing are required for high-speed applications. Ensure the system can accommodate the single 5 V supply requirement and provides an external reference voltage between 0 V and VDD. Verify that the source impedance driving the analog inputs remains below 100 Ω to maintain specified accuracy.

Part Context

The AD7824UQ belongs to the AD7824/AD7828 family of LC2MOS high-speed ADCs. While the AD7824 offers four channels, the AD7828 variant provides eight channels. Both share the same half-flash conversion technology and interface characteristics, differing primarily in channel count and pin configuration.

Replacement Considerations

The AD7824CQ serves as a compatible alternative for industrial temperature ranges (-40°C to +85°C) with identical electrical specifications but a narrower thermal window. The AD7824TQ offers the same extended temperature range but with a ±1 LSB error specification instead of ±1/2 LSB.