AD7828KN

Overview

The AD7828KN is an 8-bit, 8-channel analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It utilizes a half-flash conversion architecture to achieve a fast conversion rate of 2.5 µs per channel, supporting a sampling frequency of 50 kHz for the eight channels. The device operates from a single 5 V supply and features a built-in track-and-hold function capable of handling signals with frequencies up to 10 kHz. It employs a parallel digital interface controlled by Chip Select (CS) and Read (RD) signals, eliminating the need for an external clock. The component is housed in a 28-lead plastic dual-in-line package (PDIP) and is rated for commercial operating temperatures ranging from 0°C to 70°C.

Feature Summary

• Half-flash conversion technique provides high-speed digitization without requiring an external clock signal.
• Integrated multiplexer and track-and-hold circuitry enable efficient multi-channel data acquisition.
• Standard microprocessor interface allows direct connection using common control signals.
• Single 5 V power supply simplifies system design and reduces component count.

Applications

• Industrial process control systems requiring multi-channel sensor monitoring
• Data acquisition modules for environmental or structural health monitoring
• Embedded measurement instruments utilizing standard microprocessors

Procurement Notes

Verify the specific suffix KN corresponds to the 28-lead PDIP package and the 0°C to 70°C temperature range as defined in the official ordering guide. Confirm that the required total unadjusted error specification matches the ±1 LSB rating associated with this grade. Ensure compatibility with existing 5 V logic levels and single-supply architectures before finalizing procurement.

Selection Notes

Select the AD7828KN when an 8-bit resolution and 50 kHz per-channel sampling rate are sufficient for the application. This model is appropriate for designs requiring a parallel interface and simple microprocessor integration without complex timing constraints. Consider alternative packages or temperature grades if surface-mount technology or extended industrial operating ranges are required.

Part Context

The AD7828KN belongs to the AD7824/AD7828 family of high-speed, multichannel ADCs. While the AD7824 variant offers four channels in a 24-lead package, the AD7828 provides eight channels in a 28-lead configuration. Both share the same LC2MOS fabrication process and half-flash conversion methodology, differing primarily in channel count and physical footprint.

Replacement Considerations

Publicly confirmed substitutes within the same family include the AD7828LN for improved linearity accuracy or the AD7828KP for a PLCC surface-mount option. Verify pinout compatibility and electrical specifications when transitioning between these variants.