AD7828LPZ

Overview

The AD7828LPZ is an 8-channel, 8-bit analog-to-digital converter (ADC) utilizing a half-flash conversion architecture. It features a built-in track-and-hold function capable of handling signals up to 10 kHz with a slew rate of 157 mV/µs. The device operates from a single 5 V supply and achieves a fast conversion rate of 2.5 µs per channel. It interfaces directly with microprocessors using standard Chip Select (CS) and Read (RD) signals without requiring an external clock. The part is housed in a 28-lead PLCC package and supports a commercial operating temperature range of 0°C to +70°C.

Feature Summary

• Half-flash conversion technique enables high-speed digitization without external clocking requirements.
• Integrated multiplexer and track-and-hold circuitry support eight single-ended analog inputs.
• Standard microprocessor interface allows direct connection via CS and RD control signals.
• Single 5 V power supply operation simplifies system design and reduces component count.

Applications

• Multichannel data acquisition systems
• Industrial process control monitoring
• Portable instrumentation

Procurement Notes

Verify the specific suffix LPZ corresponds to the 28-lead PLCC package variant with ±1/2 LSB total unadjusted error tolerance. Confirm that the commercial temperature grade (0°C to +70°C) aligns with the intended operational environment. Ensure the ordering documentation explicitly references the Analog Devices AD7828 series specifications for accuracy validation.

Selection Notes

Select this component when an 8-channel input multiplexed ADC is required with moderate resolution and high speed. The half-flash architecture provides faster conversion than successive approximation types while maintaining low power consumption. Ensure the driving source impedance remains below 100 Ω to maintain specified accuracy levels during the sampling phase.

Part Context

This model belongs to the AD7824/AD7828 family of high-speed multichannel ADCs. The AD7828 variant specifically provides eight analog input channels compared to the four channels found in the AD7824. Both share identical conversion architectures and timing characteristics, differing primarily in channel count and pin configuration.

Replacement Considerations

The AD7828KP+ serves as a verified alternative within the same product family, offering identical electrical performance but packaged in a 28-lead PLCC format with ±1 LSB error tolerance.