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First programmable gain amplifier

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MICROCHIP Technology has introduced its first programmable gain amplifier (PGA), enabling users to have digital control of the analogue domain, with the integration of an amplifier, MUX, and gain control selected via an SPI bus.

Known as the MCP6S2x, this product family gives digital control over the amplifier function and design. The devices are programmed over the SPI bus enabling the user to have control of the gain and input channel selection.

This gives designers system flexibility that otherwise could not be achieved easily. In addition, the PGA removes the need for feedback and input resistors, which decreases cost and reduces board space.

The SPI bus is used to select the gain level and the input channel providing analogue input expansion for the microcontroller. This reduces the cost of the microcontroller by lowering the number of input/output pins needed.

Moreover, the multiple channels for the same signal path enable system self-calibration of the analogue signal path, enhancing accuracy over time and temperature.

Target applications for this product include industrial and instrumentation markets as well as signal and sensor processing.

Available in 1, 2, 6 and 8-channel inputs this product has eight-gain steps with an amplifier bandwidth of 2MHz to 12MHz. The broad bandwidth is achieved in these amplifiers for a lower supply current, which reduces power supply demands.

This device has a supply voltage operation of 5.5 to 2.5V and operates over the -40°C to +125°C range. In addition, it offers low noise of 10nV/rtHz and low offset voltage 275uV, TDH+N 0.0012 per cent, 200ns settling time and gain steps of 1, 2, 4, 5, 8, 10, 16 and 32V/V.

The MCP6S21 and the MCP6S22 are available in 8-PDIP, SOIC and MSOP packages. The MCP6S26 is available in 14-PDIP, SOIC and TSSOP packages and the MCP6S28 is available in 16-PDIP, SOIC and TSSOP packages.

Samples and volume quantities are available now. For additional information or pricing on these devices, visit www.microchip.com.

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