Microchip Technology’s family of 900 kHz, selectable-gain amplifiers, the MCP6G01, MCP6G02, MCP6G03 and MCP6G04, feature a gain-select pin in place of a negative-input pin, enabling digital gain control. The amplifiers can be used as drop-in replacements for op amps, as microcontroller-controlled amplifiers or as stand-alone gain blocks and eliminate the need for external resistors.

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The amplifiers feature a supply range of 1.8 V to 5.5 V, quiescent current of 110 ìA and a bandwidth of 350 kHz for a gain of 10, 250 kHz for a gain of 50 and 900 kHz at unity gain. Gain error is less than 1%.

The devices enable designers to select gains of 1, 10 or 50 simply by driving the gain-input pin to the high, low- or high-Z state with the microcontroller, or connecting it directly to Vcc, Vss or allowing it to float for op amp drop-in replacement or stand-alone operation. Additionally, the amplifiers adjust internal compensation when higher gain is selected.

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. The MCP6G01 (single) and MCP6G03 (single with chip select) are priced at $0.34 each, the MCP6G02 (dual) at $0.43 each, and the MCP6G04 (quad) at $0.70 each, all in 10,000-unit quantities. Samples are available.