AD7824CQ

Overview

The AD7824CQ is an 8-bit, 4-channel analog-to-digital converter utilizing a half-flash architecture. It operates on 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 input signals up to 10 kHz. Conversion time is 2.5 µs per channel, supporting a sampling rate of 100 kHz. Total unadjusted error is ±1/2 LSB maximum. It uses parallel data outputs and requires an external reference voltage.

Feature Summary

• Half-flash conversion technique eliminates the need for an internal clock signal.
• Built-in track-and-hold function supports high slew rate inputs without external components.
• Parallel interface allows direct connection to standard microprocessors using Chip Select and Read signals.

Applications

• Industrial process control systems requiring multi-channel monitoring
• Data acquisition modules for sensor interfacing
• Microprocessor-based measurement instruments

Procurement Notes

Verify the specific suffix CQ indicates industrial temperature range operation from -40°C to +85°C. Confirm package type Q-24 matches design requirements. Check current availability status as distribution may vary. Ensure external reference voltage specifications align with system accuracy needs.

Selection Notes

Select this component when four multiplexed channels are required at 8-bit resolution. The half-flash architecture offers faster throughput than successive approximation types. Verify that the 100 kHz per-channel sampling rate meets application bandwidth requirements. Consider the parallel interface complexity versus serial alternatives if pin count is constrained.

Part Context

The AD7824 belongs to the Analog Devices LC2MOS high-speed ADC family. It is the 4-channel variant of the AD7828, which provides eight channels. Both devices share identical electrical characteristics and conversion techniques, differing only in the number of analog input channels available via the internal multiplexer.

Replacement Considerations

The AD7824BQ serves as a commercial grade alternative with identical electrical specifications but a narrower operating temperature range of 0°C to 70°C. Other variants include AD7824KN and AD7824LN for different temperature grades.