AD7890BNZ-4

ADCs/DACs - Special Purpose Overview

The AD7890BNZ-4 is an 8-channel, 12-bit serial data acquisition system from Analog Devices. It integrates a multiplexer, track/hold amplifier, ADC, and 2.5 V reference on a single chip. Operating from a single 5 V supply, it supports an analog input range of 0 V to 4.096 V. The device features a maximum conversion time of 5.9 μs and a typical power dissipation of 30 mW in normal mode. It utilizes a high-speed serial interface for communication with microcontrollers and DSPs.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 8-channel multiplexer with separate access to MUX OUT for external antialiasing filtering
• On-chip 2.5 V voltage reference and track/hold amplifier
• High-speed bidirectional serial interface compatible with CMOS/TTL logic
• Low-power operation: 30 mW typical in normal mode, 75 μW typical in standby

ADCs/DACs - Special Purpose Applications

• Industrial process control systems requiring multi-channel signal acquisition
• Data acquisition modules for microcontroller-based embedded systems
• Signal conditioning interfaces for DSP processors
• Battery-powered instrumentation due to low power consumption

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'BNZ' against the manufacturer's current ordering guide to confirm package type (PDIP or SOIC) and compliance status. Ensure the '-4' designation matches the required 0 V to 4.096 V input range for the target application. Cross-reference pinout compatibility if replacing legacy components.

ADCs/DACs - Special Purpose Selection Notes

Select this component when an 8-channel, 12-bit resolution is required with a unipolar 0–4.096 V input range. The B version indicates a commercial temperature range of -40°C to +85°C. Consider the S version for extended industrial temperatures (-55°C to +125°C). Ensure the system clock frequency does not exceed 2.5 MHz for specified performance.

ADCs/DACs - Special Purpose Part Context

The AD7890 series belongs to Analog Devices' LC2MOS data acquisition family. The AD7890BNZ-4 specifically denotes the B-grade temperature variant with the -4 input range scaling. It is part of a broader lineup including bipolar (-10) and lower voltage (-2) ranges, sharing the same monolithic architecture and pinout.

ADCs/DACs - Special Purpose Replacement Considerations

Direct replacements include other AD7890 variants with different input ranges (AD7890ANZ-10, AD7890ARZ-2) or temperature grades (AD7890SNZ-4). Verify that the substitute maintains the 0–4.096 V input range and serial interface timing requirements.