PGA205AP

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PGA205 is a versatile CMOS gain block amplifier that provides multiple direct signal path gains with a low-power envelope to those designing portable or low-voltage signal chain components. Ideal for a wide range of applications requiring the signal-conditioning advantage of a variable-gain amplifier, PGA205 provides a combination of dynamic characteristic, signal integrity, and power savings.

The wide dynamic range and controlled gain steps of the PGA205 make it a preferred choice for instrumentation applications where selecting and amplifying DC and low-frequency AC signals of various magnitudes are required. Specifically designed to be a GainBlocks Amplifier, the PGA205 integrates dual amplifiers with gain and selectable gain range steps, adjustable outputs and integrated level-pulling and current limiter circuits.

PGA205AP Application Field

PGA205 is suitable for instrumentation and portable product applications, especially for the condition of low voltage and low power. The wide dynamic range and precision step adjustment of the PGA205 make it the preferred choice for applications requiring advanced signal processing.

• Automotive, Mobile and Energy/Portable: Pressure, temperature, strain, flow and other sensor signal conditioning, fuel gauging and other battery management applications
• Industrial, Communications, Computers and Consumer: Medical instrumentation, barcode readers, communication interface and other optical receivers, ultrasonic and EMI/EMC requirements.

Working Principle

PGA205 implements a precision amplifier and an adjustable gain-block amplifier with independent gain setting and output level-pulling function. The device is powered by a single supply with a range of 2.4V to 5.5V and consumes only 450μA of current. The PGA205 offer gain selections that range from 0.2V/V to 5V/V, designed to amplify signals with a wide dynamic range.

The gain of the Amplifier-GainSection is determined by the setting of the digital potentiometer DGND pins. The digital potentiometer’s gain can be adjusted by a resistive divider or a digitally encoded resistor (DER) connected to the DGND pins. The output of the gain block’s amplifier is connected to the level-pulling ( Level-PullingSection) circuit and regulated via a trans-conductance (gM) device.

The trans-conductance device is connected between the amplifier’s output and the negative input of the amplifier-gain block. When the input signal of the amplifier-gain section is greater than the set voltage, the current in the device flows. This current flows into the output of the amplifier-gain section, which reduces the output voltage of the amplifier-gain section. This is known as “level-pulling” and is used to keep the maximum output from the amplifier section within the safe upper limit.

The level-pulling circuit also serves to extend the gain range of the amplifier-gain section. The ability to adjust the output limit of the amplifier-gain section allows the gain block to be used in applications that require high gain settings to produce large output signals. In addition to level-pulling, the integrated current limiter circuitry ensures that the amplifier-gain section won’t consume more than the designed power.

In summary, the PGA205 is a versatile gain block amplifier that integrates dual amplifiers with gain range steps, adjustable outputs and integrated level-pulling and current limiter circuits. Its low-power consumption and integrated circuits make it an ideal choice for a wide range of instrumentation, portable and low voltage signal chain components.

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