AD7822BRU

Overview

The AD7822BRU is an 8-bit, single-channel analog-to-digital converter (ADC) from Analog Devices. It features a half-flash architecture with a maximum throughput of 2 MSPS and a conversion time of 420 ns. The device operates on a single supply voltage of either 3 V ± 10% or 5 V ± 10%. Key electrical parameters include a signal-to-noise ratio of 48 dB minimum, integral nonlinearity of ±0.75 LSB max, and differential nonlinearity of ±0.75 LSB max. It includes an on-chip 2.5 V reference and supports flexible parallel interfacing.

Feature Summary

• High-speed 8-bit half-flash ADC with 420 ns conversion time
• On-chip track-and-hold amplifier supporting input frequencies up to 10 MHz
• Automatic power-down at the end of conversion for low power consumption
• Flexible parallel interface with EOC pulse for standalone operation

Applications

• Data acquisition systems
• DSP front ends
• Disk drives
• Mobile communication systems
• Subsampling applications

Procurement Notes

Verify the specific package variant when ordering, as the BRU suffix denotes a TSSOP-20 package. Confirm that the required channel count matches the single-channel specification of the AD7822 series. Ensure compatibility with the intended microprocessor interface logic levels before finalizing procurement.

Selection Notes

Select this component for applications requiring high-speed sampling with moderate resolution. The AD7822 is suitable where a single-ended input is sufficient. Consider the AD7825 or AD7829 if multiple channels are needed. Verify that the system can accommodate the parallel interface requirements and the specific power supply constraints of 3 V or 5 V.

Part Context

The AD7822 is part of the AD7822/AD7825/AD7829 family of high-speed, microprocessor-compatible 8-bit ADCs. This family shares common architectural features such as the half-flash conversion technique and on-chip reference. The AD7822 specifically provides one analog input channel, distinguishing it from the four-channel AD7825 and eight-channel AD7829 variants within the same product line.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.