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Microchip intros 'first' amps with gain-select pin

Posted: 16 Oct 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Microchip? MCP6G01? MCP6G02? MCP6G03? MCP6G04?

Microchip's MCP6G0x programmable amplifier

Microchip Technology has added a family of 900kHz selectable-gain amplifiers to its portfolio of programmable amplifiers. The MCP6G01, MCP6G02, MCP6G03 and MCP6G04 (MCP6G0x) are said to be the first amplifiers with a gain-select pin in place of a negative-input-pin, enabling digital gain control for better system accuracy and dynamic range. These amplifiers can be used as drop-in replacements for op amps, MCU-controlled amplifiers or as stand-alone gain blocks. They also eliminate the need for external resistors, thereby reducing component count, design size and cost.

The MCP6G0x amplifiers feature an operation range of 1.8-5.5V, quiescent current of 110?A and a gain bandwidth product (GBWP) of 350kHz for 10V/V, 250kHz for 50V/V and 900kHz at 1V/V. With less than one percent gain error, they have lower gain error than traditional op amp solutions that use expensive one percent resistors. The devices enable designers to select gains of 1-, 10- or 50V/V simply by driving the gain-input pin to the high, low or high "Z" state with the MCU, or connecting it directly to Vcc, Vss or No-Connect for op amp drop-in replacement or stand-alone operation. Additionally, the amplifiers adjust internal compensation when higher gain is selected, providing greater bandwidth at a lower current.

"With the introduction of the MCP6G0x selectable-gain amplifier family, Microchip continues to fulfil its mission of making low-power analog for the digital age," said Bryan Liddiard, VP of marketing with Microchip's analog and interface products division. "This family offers low-power performance as stand-alone devices or as MCU-controlled amplifiers, while still fitting the standard operational amplifier footprint. Additionally, they give designers the ability to digitally control gain for improved system accuracy and dynamic range."

The internal feedback resistors of the MCP6G0x amplifiers are laid out in consideration of thermal gradient issues to reduce gain error over temperature. The devices are capable of extended-temperature operation and are suitable for battery-powered handheld devices such as those used for industrial, consumer and medical applications.

The MCP6G01, MCP6G02 and MCP6G03 are available in 8-pin MSOP or SOIC packages, and the MCP6G04 is available in 14-pin TSSOP and SOIC packages.




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