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Programmable gain amplifier

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article image Programmed over the SPI bus, giving users control of the gain and input channel selection.

MICROCHIP Technology has released the MCP6S9X range of programmable gain amplifiers. They provide digital control over the amplifier function and design.

The ability to configure the system gain and signal path during operation allows maximum flexibility for system self-calibration and other system operation adjustments while the end application is in use.

They programmed over the SPI bus, giving users control of the gain and input channel selection. The SPI bus is used to select the gain level and the input channel providing analogue input expansion for a microcontroller or digital signal processor. This reduces the cost of the microcontroller by lowering the number of input/output pins needed. Multiple channels for the same signal path enable system self-calibration of the analogue signal path, enhancing accuracy over time and temperature.

Target applications include industrial and instrumentation markets as well as signal and sensor processing. The amplifiers are available with one and two-channel inputs. They have eight gain steps with an amplifier bandwidth of 1MHz-18MHz.

They have a supply voltage operation of 2.5V-5.5V and operates over the –40ºC to 125ºC range. It has noise levels of 10nV/rtHz and an offset voltage 150μV, THD+N 0.0011 percent, 200ns settling time and gain steps of 1V/V, 2V/V, 4V/V, 5V/V, 8V/V, 10V/V, 16V/V and 32V/V.

The MCP6S91 and MCP6S92 are available in 8-PDIP, SOIC and MSOP packages, while the MCP6S93 is available in a 10-MSOP package.

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