AD7895ARZ-10REEL

Overview

The AD7895ARZ-10REEL is a 12-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices. It operates from a single +5 V supply and features an input voltage range of ±10 V. The device integrates a track/hold amplifier, an on-chip clock, and a high-speed serial interface within an 8-pin SOIC package. Key electrical specifications include a maximum conversion time of 3.8 μs in Mode 1 operation and a typical power dissipation of 16 mW. The part supports a throughput rate up to 192 kHz with a signal-to-noise ratio of 70 dB.

Feature Summary

• Integrates a fast 12-bit ADC with a track/hold amplifier and on-chip clock in an 8-pin package.
• Features a high-speed two-wire serial interface for easy connection to microcontrollers.
• Supports automatic power-down mode to minimize energy consumption during low sampling rates.
• Provides internal signal scaling to handle bipolar ±10 V inputs using a single +5 V supply.

Applications

• Battery-powered or portable instrumentation systems requiring low power consumption.
• Industrial process control applications involving bipolar signal acquisition.
• Data acquisition systems interfacing with microcontrollers via serial protocols.

Procurement Notes

Verify the specific suffix '10' confirms the ±10 V input range capability. Confirm the 'ARZ' designation indicates the RoHS-compliant SOIC-8 package variant. Ensure the REEL packaging format matches the required manufacturing automation standards for the assembly line.

Selection Notes

Select this component when a single-supply solution is required for bipolar signals without external negative rails. Compare against the AD7894 if 14-bit resolution is necessary, noting that it maintains pin compatibility. Consider the AD7895-3 or AD7895-2 variants if the application utilizes smaller input voltage ranges such as ±2.5 V or unipolar 0 V to +2.5 V.

Part Context

The AD7895 belongs to a family of fast, low-power serial ADCs designed for space-constrained environments. It offers a compact alternative to discrete solutions by combining signal conditioning and conversion logic. The device serves as a bridge between analog sensor outputs and digital processing units in embedded architectures.

Replacement Considerations

The AD7894 is a 14-bit pin-compatible upgrade option available in the same package. Verify that the increased resolution meets system requirements without exceeding available processing bandwidth or power budgets.

FAQ

How does the AD7895 handle bipolar inputs with a single positive supply?

The device incorporates internal signal scaling circuitry that allows it to accept ±10 V input ranges while operating solely from a +5 V supply, eliminating the need for external negative voltage rails.

What is the difference between Mode 1 and Mode 2 operation?

Mode 1 provides high sampling performance with a 3.8 μs conversion time. Mode 2 enables an automatic power-down state after conversion, increasing the total cycle time to 9.8 μs but significantly reducing average power consumption.

What reference voltage is required for correct operation?

The AD7895 requires an external +2.5 V reference connected to the REF IN pin. This reference is buffered on-chip and determines the full-scale range of the conversion.