AD7890BRZ-2

ADCs/DACs - Special Purpose Overview

The AD7890BRZ-2 is an 8-channel, 12-bit data acquisition system fabricated in LC2MOS technology. It integrates an input multiplexer, track/hold amplifier, SAR ADC, and a 2.5 V reference. Operating from a single 5 V supply, it supports a unipolar analog input range of 0 V to 2.5 V. The device features a high-speed serial interface with a maximum conversion time of 5.9 μs. DC accuracy specifications include ±1 LSB differential nonlinearity, ±2.5 LSB gain error, and ±2 LSB unipolar offset error. Dynamic performance includes a signal-to-noise ratio of 70 dB.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 8-channel multiplexer with separate access to MUX OUT for external antialiasing filtering
• High-speed serial interface compatible with microcontrollers and DSP processors
• On-chip 2.5 V voltage reference with external reference input capability
• Low power consumption: 50 mW maximum in normal mode, 75 μW typical in standby

ADCs/DACs - Special Purpose Applications

• Industrial process control systems requiring multi-channel signal acquisition
• Data logging equipment with moderate sampling rate requirements
• Battery-powered instrumentation utilizing low-power standby modes
• Automotive test and measurement applications

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix '2' indicates the 0 V to 2.5 V input range variant. Confirm package availability in SOIC-24 format. Check RoHS compliance status as manufacturing processes may vary by production lot. Ensure ordering documentation matches the BRZ designation for commercial temperature range operation.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a single-supply 5 V operation is required with a limited input range of 0 V to 2.5 V. The separate MUX OUT pin allows for shared antialiasing filters across all channels, reducing bill of materials cost compared to internal connections. Ensure the serial interface timing aligns with the host microcontroller's clock capabilities.

ADCs/DACs - Special Purpose Part Context

The AD7890 belongs to Analog Devices' specialized data acquisition family. It is part of a series differentiated by input voltage ranges, specifically the AD7890-2 (0–2.5 V), AD7890-4 (0–4.096 V), and AD7890-10 (±10 V). The BRZ suffix denotes the commercial temperature grade (-40°C to +85°C) and lead-free SOIC-24 packaging.

ADCs/DACs - Special Purpose Replacement Considerations

Direct functional substitutes within the same family include AD7890BRZ-4 and AD7890BRZ-10, provided the input voltage range differences are accommodated in the circuit design. Cross-family replacements require verification of pin compatibility and interface protocols.