Microchip Technology has expanded its portfolio of programmable amplifiers with a family of 900 MHz, selectable-gain amplifiers. The MCP6G0x are 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, which eliminate the need for external resistors, can be used as drop-in replacements for op-amps, as microcontroller-controlled amplifiers or as standalone gain blocks. The MCP6G0x amplifiers feature a low-voltage operation range of 1,8 to 5,5 V, low quiescent current of 110 μA and a high bandwidth of 350 kHz for 10 V/V, 250 kHz for 50 V/V and 900 kHz at 1 V/V. With less than 1% gain error, they have lower gain error than traditional op-amp solutions that use expensive 1% resistors, according to Microchip. The devices enable designers to select gains of 1, 10 or 50 V/V 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 No-Connect for op-amp drop-in replacement or standalone operation. Additionally, the amplifiers adjust internal compensation when higher gain is selected, providing greater bandwidth at a lower current.
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