AD7895ARZ-3REEL

Overview

The AD7895ARZ-3REEL is a 12-bit successive approximation analog-to-digital converter (ADC) housed in an 8-pin SOIC package. It operates from a single +5 V supply and features an internal track/hold amplifier, clock generator, and serial interface. The -3 suffix designates a bipolar input voltage range of ±2.5 V with two's complement output coding. Key electrical parameters include a maximum conversion time of 3.8 μs, a signal-to-noise ratio of 70 dB, and a maximum power dissipation of 20 mW. The device supports throughput rates up to 192 kHz and includes an automatic power-down mode for low-power applications.

Feature Summary

• Integrated on-chip track/hold amplifier and clock oscillator eliminate external timing components.
• High-speed serial interface utilizes only three control lines: SCLK, SDATA, and BUSY.
• Proprietary automatic power-down mode activates after conversion to minimize energy consumption.
• Bipolar input scaling allows direct connection of ±2.5 V signals without external attenuation.

Applications

• Battery-powered portable instrumentation requiring low quiescent current.
• Industrial data acquisition systems utilizing serial microcontroller interfaces.
• Process control loops monitoring bipolar sensor signals within ±2.5 V ranges.

Procurement Notes

Verify the REEL suffix indicates tape-and-reel packaging rather than tube packaging when sourcing this specific variant. Confirm the -3 suffix matches the required ±2.5 V input range specification for the application circuit. Ensure the operating temperature range aligns with the commercial grade (-40°C to +85°C) defined for the ARZ version.

Selection Notes

Select the AD7895ARZ-3REEL specifically for applications requiring a ±2.5 V bipolar input range. Choose this part over the -10 or -2 variants based on the signal amplitude requirements. Consider the 192 kHz throughput capability if high-speed sampling is necessary, noting that lower speeds may utilize the auto-sleep mode for further power reduction.

Part Context

The AD7895 series represents Analog Devices' solution for compact, single-supply ADC implementations. The ARZ designation identifies the surface-mount SOIC-8 package variant compliant with RoHS standards. This component serves as a bridge between analog sensor outputs and digital processing units in space-constrained designs.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pin compatibility and input range specifications before considering alternative manufacturers.