AD7880BNZ

Overview

The AD7880BNZ is a monolithic 12-bit successive-approximation analog-to-digital converter (ADC) fabricated in Analog Devices' LC2MOS process. It operates from a single +5 V supply and delivers a throughput rate of 66 kHz with a total conversion time of 12 μs and an acquisition time of 3 μs. The device features a power save mode consuming 2 mW typ and normal operation at 25 mW typ. Key electrical specifications include a signal-to-noise ratio (SNR) of 70 dB min, integral nonlinearity (INL) of ±1 LSB max, and differential nonlinearity (DNL) of ±1 LSB max. It supports three user-defined input ranges: 0 V to +5 V, 0 V to +10 V, and ±5 V.

Feature Summary

• Integrated track-and-hold amplifier enables fast data acquisition for high-speed signal processing applications.
• Versatile interface logic allows direct connection to modern microprocessors and digital signal processors.
• Internal resistor network facilitates unipolar and bipolar input configurations using only a single +5 V supply.

Applications

• Battery powered portable systems
• Digital signal processing
• Speech recognition and synthesis
• High speed modems

Procurement Notes

Verify the specific suffix 'N' indicates a plastic dual-in-line package (PDIP). Confirm that the B-version temperature range (-40°C to +85°C) matches the design requirements. Ensure the ordering guide aligns with the required accuracy class, as C-versions offer tighter error margins. Cross-reference pinout details with the target PCB footprint to avoid assembly errors.

Selection Notes

Select the AD7880BNZ when a 12-bit resolution and 66 kHz sampling rate are sufficient for the application bandwidth. Consider the B-version accuracy specifications if tighter full-scale and zero errors are not critical. Evaluate the need for external clock generation, as the device requires a 2.5 MHz CLKIN input. Assess whether the parallel interface fits the available microprocessor resources compared to serial alternatives.

Part Context

The AD7880 series includes variants with different packages and accuracy grades. The 'B' suffix denotes industrial temperature range with standard accuracy, while 'C' offers improved DC accuracy. Package options include plastic DIP ('N'), ceramic DIP ('Q'), and SOIC ('R'). The BNZ designation specifically identifies the industrial grade part in a 24-lead plastic DIP package.

Replacement Considerations

Direct replacements within the same family include AD7880CNZ for higher DC accuracy or AD7880BRZ for surface mount implementation. Verify pin compatibility and software register mapping if migrating between package types or accuracy grades.