Gain-selectable amps compensate for bandwidth roll-off
By Paul Rako, Technical Editor -- EDN, September 26, 2006
Microchip's new MCP6G01 and MCP6G02 series of amplifiers uses one pin to select a gain of one, 10, or 50, resulting in bandwidths of 900 kHz, 350 kHz, and 250 kHz, respectively. The gain pin can be floated, yielding the third gain setting, and gain selection adjusts internal compensation. Quiescent current is 110 μA. The internal gain-setting resistors also give a gain accuracy of better than 1%. CMOS-process technology limits the maximum operating voltage to 5.5V, but the part operates on 1.8V for mobile-system and other low-voltage applications.
The MCP6G01 and MCP6G02 are available in eight-pin SOIC packages or MSOPs for 34 and 43 cents (10,000), respectively, The quad MCP6G04 comes in 14-pin SOIC packages and TSSOPs for 70 cents.
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