AD7896BRZ-REEL7

Overview

The AD7896BRZ-REEL7 is a 12-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single 2.7 V to 5.5 V supply and features an on-chip track-and-hold amplifier, internal clock, and high-speed serial interface. The device provides a throughput rate of 100 kS/s with an 8 µs conversion time in high sampling mode. It accepts a unipolar analog input range of 0 V to VDD, utilizing the supply voltage as the reference. The component is housed in an 8-lead SOIC package and supports industrial temperature ranges.

Feature Summary

• Integrates a 12-bit SAR ADC, track-and-hold amplifier, and serial interface logic within an 8-lead package.
• Operates from a single power supply ranging from 2.7 V to 5.5 V without requiring an external voltage reference.
• Features a proprietary automatic power-down mode that activates after conversion completion to minimize energy consumption.
• Provides a high-speed two-wire serial interface compatible with standard microcontrollers and DSP processors.

Applications

• Battery-powered portable instrumentation systems
• Industrial data acquisition modules
• Process control signal conditioning circuits

Procurement Notes

Verify the specific suffix REEL7 indicates tape and reel packaging when sourcing components. Confirm the B version designation corresponds to the required industrial temperature specifications for the intended application environment. Ensure compatibility with the 8-lead SOIC footprint during PCB layout planning.

Selection Notes

Select this component for applications requiring a compact solution with integrated tracking and holding capabilities. Consider the 100 kHz throughput limit and 12-bit resolution constraints. Evaluate the single-supply operation against system power budgets and verify interface timing requirements against the host processor's clock speeds.

Part Context

This part belongs to the AD7896 family of fast, low-power sampling ADCs. The BRZ-REEL7 variant specifically denotes the industrial temperature grade packaged in a tape and reel format for automated assembly. It shares architectural similarities with other members of the series but differs in temperature rating and packaging configuration.

Replacement Considerations

Direct substitutes include the AD7896ARZ-REEL7 for commercial temperature grades or the AD7896JRZ for legacy PDIP options. Verify pinout compatibility and electrical parameter alignment before substitution.

FAQ

How does the AD7896 handle the analog reference voltage?

The device utilizes the VDD supply pin as its internal reference voltage, eliminating the need for an external reference component.

What is the function of the BUSY pin?

The BUSY pin indicates the conversion status; it goes high on the falling edge of CONVST and returns low when the conversion is complete.

How many bits are output via the serial interface?

The serial interface outputs 16 bits per cycle, consisting of four leading zeros followed by the 12-bit conversion result.