AD7824KN

Overview

The AD7824KN is a high-speed, multichannel, 8-bit analog-to-digital converter (ADC) featuring four multiplexed analog inputs. It utilizes a half-flash conversion technique to achieve a fast conversion rate of 2.5 µs per channel, supporting a sampling frequency of 100 kHz. The device includes 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 dissipates 50 mW typically and offers a tight total unadjusted error specification of ±1 LSB. The component interfaces via standard Chip Select and Read signals without requiring an external clock.

Feature Summary

• Half-flash conversion architecture eliminates the need for an external ADC clock signal.
• Integrated track-and-hold circuitry handles input signals up to 10 kHz bandwidth.
• Microprocessor interface compatible with standard memory-mapped read operations.
• Single 5 V power supply operation simplifies system design requirements.

Applications

• Speech analysis systems utilizing real-time filtering
• Fast infinite sample-and-hold circuits
• Multichannel data acquisition systems

Procurement Notes

Verify the specific ordering suffix 'KN' corresponds to the commercial temperature range (0°C to 70°C) and the N-24 package option when sourcing replacements. Confirm that the required accuracy matches the ±1 LSB total unadjusted error specification defined for this grade. Ensure the application environment remains within the specified voltage and thermal limits to maintain performance integrity.

Selection Notes

Select the AD7824KN when a cost-effective, space-saving solution for four-channel acquisition is required. This model is suitable for applications needing 100 kHz per-channel sampling rates without external sample-and-hold amplifiers. Consider the AD7828 if eight channels are necessary, or other grades if industrial or extended temperature ranges are required.

Part Context

The AD7824 belongs to the LC2MOS family of high-speed ADCs manufactured by Analog Devices. It is part of a series that includes the 8-channel AD7828 variant. The device is fabricated using an advanced, all ion-implanted, linear compatible CMOS process designed for low power dissipation and high linearity in mixed-signal applications.

Replacement Considerations

The AD7824LN serves as a higher accuracy alternative within the same package and temperature range, offering ±1/2 LSB error. For eight-channel requirements, the AD7828KN provides identical speed and interface characteristics with double the input count.