Microchip Technology has announced its first programmable gain amplifier, which enables users to have digital control of the analog 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.
"This is a truly innovative way to interface several analog signals to a microcontroller," said Art Eck, marketing manager for Microchip's analog and interface product division. "Our devices provide the flexibility to configure the system gain and signal path during operation. This helps with self calibration and other system operation adjustments while the end application is in actual use, making our product something that can be programmed 'in the field and on the fly'."
The SPI bus is used to select the gain level and the input channel providing analog 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 enables system self-calibration of the analog signal path, enhancing accuracy over time and temperature. Target applications 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 2 to 12 MHz. 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 2,5 V and operates over the -40 to +125°C range. Additionally, it offers low noise of 10 nV/rtHz and low offset voltage 150 µV, TDH+N 0,0012%, 200 ns settling time and gain steps of 1, 2, 4, 5, 8, 10, 16 and 32 V/V.
For more information contact Avnet Kopp, 011 809 6100, Memec SA, 021 674 4103, or Tempe Technologies, 011 452 0530.
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