AD7825BRZ

Overview

The AD7825BRZ is an 8-bit, 4-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 specifications include a signal-to-noise ratio of 48 dB, integral nonlinearity of ±0.75 LSB, and differential nonlinearity of ±0.75 LSB. It includes an on-chip 2.5 V reference, a track-and-hold amplifier, and a flexible parallel interface with an end-of-conversion pulse.

Feature Summary

• Half-flash ADC architecture providing fast conversion times suitable for real-time systems.
• On-chip track-and-hold amplifier capable of handling full-scale input signals up to 10 MHz.
• VMID pin allows adjustment of the analog input span to accommodate system offsets.
• Automatic power-down mode at the end of conversion to minimize power consumption.

Applications

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

Procurement Notes

Verify the specific package type and temperature grade when ordering. Confirm that the selected variant matches the required channel count and interface timing. Ensure proper ESD precautions are taken during handling due to the sensitivity of the CMOS inputs. Check for any recent revisions to the datasheet regarding pin configurations or absolute maximum ratings.

Selection Notes

Select this component for applications requiring high-speed sampling with moderate resolution. Consider the 4-channel configuration if multiple single-ended signals need simultaneous digitization. Evaluate the power supply requirements against the available system rails. Ensure the microprocessor interface can support the parallel data bus and control signals efficiently.

Part Context

The AD7825BRZ belongs to the AD7822/AD7825/AD7829 family of high-speed sampling ADCs. This series shares common architectural features such as the half-flash conversion technique and on-chip reference. The BRZ suffix typically indicates a lead-free, RoHS-compliant version in a SOIC-24 package, distinguishing it from older PDIP or TSSOP variants.

Replacement Considerations

Direct replacements within the same family include the AD7822 (1 channel) and AD7829 (8 channels), provided the channel count difference is acceptable. Other Analog Devices 8-bit ADCs with similar speed and interface characteristics may serve as alternatives if pin compatibility is not required.