AD7828LNZ

Overview

The AD7828LNZ is an 8-bit, 8-channel analog-to-digital converter (ADC) from Analog Devices. It utilizes a half-flash conversion technique to achieve a fast conversion rate of 2.5 µs per channel. The device features a built-in track-and-hold function capable of handling signals up to 10 kHz with a slew rate of 157 mV/µs. Operating on a single 5 V supply, it consumes 50 mW of power typ. The total unadjusted error is ±1/2 LSB max. It interfaces via parallel data outputs and standard Chip Select (CS) and Read (RD) signals without requiring an external clock.

Feature Summary

• Half-flash architecture provides high-speed conversion without external clocking
• Integrated multiplexer supports eight single-ended analog input channels
• Built-in track-and-hold circuitry enables direct digitization of 10 kHz signals
• Standard microprocessor interface simplifies system integration

Applications

• Multichannel data acquisition systems
• Industrial process control monitoring
• Speech analysis using real-time filtering
• Fast infinite sample-and-hold applications

Procurement Notes

Verify the specific ordering suffix 'LNZ' against current manufacturer documentation to confirm package type and temperature range compliance. Confirm availability status as distribution listings may indicate limited stock or discontinuation for this specific variant. Ensure the external reference voltage matches the required 5 V specification for optimal performance.

Selection Notes

Select the AD7828LNZ when eight simultaneous analog inputs are required within a single component. This model is suitable for designs needing a 5 V single-supply operation and parallel digital interfacing. Consider the ±1/2 LSB total unadjusted error specification for accuracy requirements. Verify that the source impedance driving the analog inputs remains below 100 Ω to maintain specified performance levels.

Part Context

The AD7828LNZ belongs to the AD7824/AD7828 family of LC2MOS high-speed ADCs. While the AD7824 offers four channels in a 24-lead package, the AD7828 provides eight channels in a 28-lead configuration. Both share identical internal architectures and timing characteristics, differing primarily in channel count and pinout assignments for address selection.

Replacement Considerations

Public confirmed substitute part numbers: AD7828LP, AD7828BR.