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MAX4063EUD Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4063EUD Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 14 page Differential Microphone Preamplifier with Internal Bias and Complete Shutdown 8 _______________________________________________________________________________________ book PCs or PDAs. Used correctly, the advantages over a single-ended solution are: • Better power-supply noise rejection. • Less degradation from noise in PC board ground planes. • The microphone and preamplifier may be placed physically further apart, easing PC board layout restrictions. Differential-Gain Adjustment The MAX4063 allows the user to alter the differential gain to optimize the signal-to-noise ratio (SNR) of their system. The gain is set by a single external resistor (RG) connected between the G1 and G2 pins: where AV is the required voltage gain. Hence, an 11.11k Ω resistor yields a gain of 20V/V, or 26dB. Leaving the pins unconnected results in a gain of 2V/V. Gain is defined as: For differential out: The resistor can be either fixed or variable, allowing the use of a digitally controlled potentiometer to alter the gain under software control. Auxiliary Input-Gain Adjustment The MAX4063 provides an option to increase the AUX_IN (see Figure 3). To increase the gain, connect resistor RADJ between the ADJ and AUX_IN pins. RADJ is calculated from the following formula: R 2M AV ADJ AUX = − Ω 20 () to increase the gain A V V VD OUT OUT IN+ IN- = − − V V R 200k A G VD = − Ω 2 BIAS BIAS AUX_IN 12 IN- IN+ 10 9 6 VCC 2.4V TO 5.5V MAX4063 2 INT/AUX 8 OUT OUT ADJ 4 7 GND 11 SHDN SHDN VCC 3 BIAS 5 VBIAS G2 G1 1 14 RG Functional Diagram |
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