AD7895ARZ-3

Overview

The AD7895ARZ-3 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 a ±2.5 V input voltage range with bipolar zero error specifications. The device integrates a track/hold amplifier, on-chip clock, and high-speed serial interface. Key electrical parameters include a maximum conversion time of 3.8 μs, a throughput rate up to 192 kHz, and a signal-to-noise ratio of 70 dB. Power consumption is limited to 20 mW maximum, with an automatic power-down mode reducing current to 5 μA.

Feature Summary

• Integrates a 12-bit SAR ADC, track/hold amplifier, and serial interface logic within an 8-pin package for space efficiency.
• Features a proprietary automatic power-down mode that activates after conversion completion to minimize energy usage.
• Provides a two-wire serial interface with dedicated clock and data lines for straightforward microcontroller connectivity.
• Includes internal signal scaling circuitry to accommodate specific analog input ranges while maintaining single-supply operation.

Applications

• Battery-powered portable instrumentation systems requiring low power consumption.
• Industrial data acquisition systems utilizing single-supply architectures.
• Portable medical devices needing compact form factor and moderate sampling rates.
• Process control applications involving bipolar voltage signal monitoring.

Procurement Notes

Verify the specific suffix '3' indicates the ±2.5 V input range variant when sourcing. Confirm the 'ARZ' designation corresponds to the SOIC-8 package and lead-free compliance status required by your assembly process. Ensure the operating temperature range aligns with your environmental specifications, as this variant supports -40°C to +85°C. Cross-reference the manufacturer's ordering guide to confirm availability and pinout compatibility with existing designs.

Selection Notes

Select the AD7895ARZ-3 when a ±2.5 V bipolar input range is required alongside single-supply operation. This model is appropriate for designs prioritizing low power dissipation through its automatic sleep mode. Consider this part if system constraints demand a compact 8-pin footprint without sacrificing 12-bit resolution. Evaluate the 192 kHz throughput capability against your signal bandwidth requirements to ensure adequate sampling performance.

Part Context

The AD7895 series comprises fast 12-bit ADCs available in multiple input range variants. The AD7895-3 specifically handles ±2.5 V inputs, distinguishing it from the ±10 V (AD7895-10) and unipolar 0 V to +2.5 V (AD7895-2) versions. All variants share the same core architecture, including the successive approximation converter and serial interface, but differ in internal signal scaling resistors to match their respective input specifications.

Replacement Considerations

The AD7894 is a 14-bit pin-compatible upgrade option. Verify that the increased resolution and potential differences in timing characteristics or power consumption are acceptable for your application before substituting.