AD7893BNZ-5

Overview

The AD7893BNZ-5 is a 12-bit successive approximation analog-to-digital converter (ADC) housed in an 8-pin mini-DIP package. It operates from a single +5 V supply and features an on-chip track/hold amplifier, internal clock, and high-speed serial interface. The device accepts a unipolar analog input range of 0 V to +5 V with a typical power dissipation of 25 mW. Key electrical specifications include a maximum conversion time of 6 μs, a signal-to-noise ratio of 72 dB, and relative accuracy of ±1/2 LSB. It supports throughput rates up to 117 kHz.

Feature Summary

• Integrated signal scaling for direct interfacing with 0 V to +5 V analog signals without external attenuation circuitry.
• On-chip track/hold amplifier ensures accurate digitization of full-scale sine waves at maximum sampling rates.
• Two-wire serial interface simplifies connection to microcontrollers and DSP processors by minimizing pin count.
• Single-supply operation reduces system complexity and makes the component suitable for battery-powered applications.

Applications

• Battery-powered portable instrumentation systems requiring low power consumption.
• Industrial process control loops utilizing standard 0 V to +5 V sensor outputs.
• Data acquisition modules in embedded systems with limited I/O pin availability.
• Medical diagnostic equipment requiring precise single-channel voltage monitoring.

Procurement Notes

Verify that the ordering suffix 'N' corresponds to the plastic mini-DIP package variant rather than the SOIC or Cerdip options. Confirm the '-5' suffix indicates the specific 0 V to +5 V input range version. Ensure the manufacturer is Analog Devices Inc. as specified in the official documentation. Check RoHS compliance status if required by local regulations. Validate the revision level of the datasheet to ensure compatibility with current design requirements.

Selection Notes

Select this part when a single-ended 0 V to +5 V input range is required without external signal conditioning. Choose the BNZ-5 variant over the ANZ-5 if higher linearity accuracy (±1/2 LSB vs ±1 LSB) is necessary for the application. Consider the 8-pin mini-DIP package constraints regarding board space and thermal management. Evaluate the 117 kHz throughput rate against the system's data acquisition speed requirements. Ensure the external reference voltage matches the internal buffered requirement of +2.5 V.

Part Context

The AD7893 series represents a family of fast, 12-bit ADCs fabricated using Linear Compatible CMOS technology. This specific model belongs to the unipolar input subset, distinct from bipolar variants like the AD7893-10 or AD7893-3. The 'B' designation indicates improved linearity performance compared to the 'A' grade. The 'N' suffix identifies the plastic dual-in-line package option within the broader AD7893 product line.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult Analog Devices for current equivalent components if discontinuation occurs.