AD7894BRZ-10

Overview

The AD7894BRZ-10 is a fast, 14-bit successive approximation analog-to-digital converter housed in an 8-lead SOIC 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 bipolar analog input signals ranging from -10 V to +10 V. Key electrical specifications include a maximum conversion time of 5 µs, a typical power dissipation of 20 mW, and a signal-to-noise ratio of 77 dB min. The part supports a throughput rate up to 160 kHz and includes differential nonlinearity of ±1.5 LSB and integral nonlinearity of ±1 LSB.

Feature Summary

• Integrated signal scaling circuitry allows direct interfacing with bipolar voltage inputs without external level shifting components.
• On-chip track/hold amplifier ensures accurate digitization of high-frequency signals by maintaining signal integrity during the conversion cycle.
• Two-wire serial interface simplifies digital connectivity by utilizing standard serial clock and data output lines for microprocessor communication.
• Automatic power-down mode reduces energy consumption by entering standby immediately after conversion completes.

Applications

• Battery-powered instrumentation requiring low power consumption and single-supply operation.
• Portable data acquisition systems needing compact packaging and high sampling rates.
• Industrial control loops utilizing bipolar sensor signals within the specified voltage range.

Procurement Notes

Verify that the specific ordering suffix corresponds to the B version temperature range (-40°C to +85°C) and the -10 input range variant. Confirm package type matches the 8-lead narrow body SOIC specification. Ensure external reference voltage requirements align with the datasheet recommendations for optimal performance.

Selection Notes

Select this component when a 14-bit resolution is required alongside a wide bipolar input range. Consider the high-speed serial interface compatibility with existing system controllers. Evaluate the power budget against the typical 20 mW consumption and the automatic sleep mode capabilities for efficiency.

Part Context

This device belongs to the AD7894 family of 14-bit ADCs manufactured by Analog Devices. It serves as a pin-compatible upgrade to the 12-bit AD7895 model. The BRZ suffix indicates the commercial temperature grade and lead-free RoHS compliant packaging configuration.

Replacement Considerations

The AD7894ARZ-10 is a verified substitute offering identical electrical characteristics but with potentially different manufacturing lot variations or minor parameter tolerances within the same family specifications.