The MAX9812/MAX9813 are single/dual input, 20dB fixed-gain microphone amplifiers. They offer a small package of old-fashioned and low-noise, integrated microphone biases that make them ideal for portable audio applications such as laptops, cell phones and PDAs. These amplifiers feature a 500kHz bandwidth, rail-to-rail output, industry-leading 100dB power supply rejection ratio, and an extremely low 0.015% THD+N. Energy-saving features include an extremely low 230μA supply current and a total shutdown mode that reduces the combined supply and bias current to only 100n a. The MAX9812 is a single-pin 6-pin S amplifier. The C70 package (2mm x 2.1m2) and the MAX9813 are dual input amplifiers available in an 8-pin SOT23 (3mm x 3mm) package. The MAX.9813 has two inputs that allow two microphones to be multiplexed into one output. The MAX9812/MAX9813 have two levels.

       The MAX9812L/MAX9813L are optimized for 3.3V supply operation (2.7V to 3.6V). The MAX9812H/?MAX9813H are PC2001 compliant and optimized for 5 volt operation (4.5 volts to 5.5 volts). Both devices are specified over the extended operating temperature range of  -40°C to +85°