AD8555ARZ-REEL7

Overview

The AD8555ARZ-REEL7 is a zero-drift, digitally programmable sensor signal amplifier manufactured by Analog Devices Inc. It features an input offset voltage of 10 µV maximum and an input offset voltage drift of 60 nV/°C maximum over the operating temperature range. The device operates on a single supply voltage between 2.7 V and 5.5 V. It provides a digitally programmable gain ranging from 70 to 1,280 via a single-wire serial interface. Key electrical specifications include a common-mode rejection ratio (CMRR) of 96 dB minimum, a supply current of 2.5 mA typical, and a gain bandwidth product of 2 MHz.

Feature Summary

• Digitally programmable gain and output offset voltage using a single-wire serial interface
• Integrated open and short wire fault detection capabilities
• Externally programmable output clamp voltage for safe driving of low voltage ADCs
• Stable operation with any capacitive load

Applications

• Pressure and position sensors
• Thermocouple amplifiers
• Industrial weigh scales
• Precision current sensing
• Strain gages

Procurement Notes

Verify the specific package configuration against the datasheet, as the AD8555 series includes both SOIC-8 and LFCSP-16 options. Confirm that the REEL7 suffix corresponds to the required tape and reel packaging format for automated assembly. Ensure compatibility with the intended digital interface timing requirements before finalizing procurement.

Selection Notes

Select this component when high DC accuracy and low drift are critical for sensor signal conditioning. The integrated auto-zero technology minimizes offset errors without external components. Consider the available gain range and the need for fault detection features when evaluating alternative precision amplifiers for bridge sensor applications.

Part Context

This part belongs to the AD8555 family of zero-drift amplifiers designed for precision sensor interfaces. It utilizes patented low noise auto-zero and DigiTrim technologies to achieve high accuracy in a compact footprint. The device is suitable for applications requiring stable performance across wide industrial temperature ranges.

Replacement Considerations

Direct substitutes within the same family include the AD8555ACPZ-REEL7, which shares identical electrical characteristics but utilizes the LFCSP-16 package instead of the SOIC-8 package found in the ARZ variant.

FAQ

How is the gain programmed on the AD8555?

Gain is adjusted via a single-wire serial interface using the DIGIN pin. Short pulses load a logic 0, while long pulses load a logic 1 into the internal shift register.

What is the function of the VCLAMP pin?

The VCLAMP pin allows for externally programmable output clamping. This feature limits the maximum output voltage, enabling safe driving of analog-to-digital converters that operate at lower supply voltages than the amplifier.