AD8418ARM-EVALZ

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Analog Devices\' 8418 ARM-EVALZ is an evaluation board that features an AD8418 Actively-Terminated Amplifier—an instrumentation amplifier used in a variety of applications. As an analog system-level tool for engineers and technicians, it can be used for an array of purposes, from impedance measurement to circuit testing to filter design and more. In this article, we put a focus on the AD8418 ARM-EVALZ application field and working principle.

Analog Signal Chain

The AD8418 ARM-EVALZ is an integrated analog switch-capacitor input/output evaluation board that supports two 4-channel differential inputs. As a tool for testing and measuring balanced/unbalanced signals and transducers, the AD8418 ARM-EVALZ supports the following type of input signals:

• Balanced, floating, AC/DC, bipolar or unbalanced signals
• High-voltage, current-driven, low-level signals

The AD8418 can be used in filtering applications and signal conditioning networks as well. When connected to other devices, such as buffer amplifiers, transducer bridges, and ADCs, the ARM-EVALZ can become a powerful signal-processing tool.

Evaluation board features

The AD8418 ARM-EVALZ comes equipped with a variety of features, designed to make it an easy-to-use tool in a variety of applications, including:

• Interchangeable precision metal and plastic photo wafers for flexibility
• On-board differential amplifier with 10MHz bandwidth
• Low-power CMOS analog switch with two selectable inputs and outputs
• Low-power CMOS analog switch with two selectable National Instruments compatible signals
• Built-in 0-3V power supply
• Perf board area for custom circuit designs

The AD8418 ARM-EVALZ can be used in various signal-transmission applications, including with sensors, transducers, and multiple-channel data acquisition systems. It is also useful for quickly prototyping signal-conditioning networks and testing active filter components.

Working Principle

The working principle of the AD8418 ARM-EVALZ is centered around its dual 4-channel differential input and output channels. As an instrumentation amplifier, the AD8418 ARM-EVALZ is intended to measure differential voltage signals that are applied to two matched input channels. The gain and bandwidth of the amplifier can be adjusted depending on application requirements.

The board works in the following manner: one input signal is applied to each input channel, while the other (output) is held at ground potential. As the signal passes through the amplifier, the output signal gains both gain and bandwidth, depending on the amplifier settings. The amplified signal is then sent to one of the dual output channels.

The AD8418 is also capable of adjusting the impedance of its outputs in order to match the input impedance of the device it is connected to. This makes the ARM-EVALZ highly effective in high-impedance signal condition applications, such as impedance measurements and transducer-based data acquisition systems.

Finally, the board makes use of a low-power CMOS analog switch, which allows it to switch between two input and output signals with ease. This switching capability is especially useful when testing or prototyping active filter components, or when using the AD8418 as a data acquisition system.

Conclusion

Analog Devices\' 8418 ARM-EVALZ is an evaluation board that has been designed to support a range of applications—from transducer measurements to signal conditioning and filter design. It features an integrated AD8418 actively-terminated amplifier with adjustable gain and bandwidth, as well as a low-power CMOS analog switch with two selectable inputs and outputs. With the ability to quickly switch between two different signals, the board is an ideal tool for signal transmission and data acquisition.

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