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MAX4062EUB Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4062EUB Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 15 page Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown 10 ______________________________________________________________________________________ AUX_IN 9 4 IN- IN+ 7 6 5 VCC 2.4V TO 5.5V MAX4062 2 GND 8 VBIAS G2 G1 BIAS RBIAS CBIAS 100k Ω OUT 3 INT/AUX 10 1 x10 Figure 1. MAX4062 with Auxiliary Input Configuration ential inputs and to set the lower 3dB point (fCUT) of the amplifier by sizing the output capacitor appropriately. The input impedance matching on the differential input is typically 1%, allowing input capacitor matching to be effective at improving low-frequency PSRR. Common-Mode Rejection Ratio The common-mode rejection ratio (CMRR) refers to the amount of rejection that the amplifier is capable of pro- viding to any signal applied equally to the IN+ and IN- inputs. In the case of amplifying low-level microphone signals in noisy digital environments, it is a key figure of merit. In audio circuits, this is generally measured for VIN as an AC signal: CMRR(dB) = ADM / ACM where ADM is the differential gain, ACM is the common- mode gain. Input voltages are sufficiently small such that the output is not clipped in either differential or common-mode application. The topology used in the MAX4061/ MAX4062 means that the CMRR actually improves at higher differential gains—another advantage of using differential sensing. Auxiliary Input The auxiliary input is a single-ended input intended to be used with a jack-socket-type microphone input (Figure 1). Internal DC-bias components (as on the main inputs) allow the input signal to be AC-coupled. Mechanically switched jack sockets can be used in conjunction with the INT/AUX select pin, allowing the auxiliary microphone input to be automatically selected when a jack socket is inserted. Microphone Bias Voltage MAX4060 The MAX4060 has a microphone bias voltage designed to comply with the Microsoft/Intel PC99/2001 audio standard. It features source impedance of greater than 2k Ω, and delivers more than 2V of bias when loaded with a current of 800μA. This limits operation of this part to supplies between 4.5V to 5.5V (see Figure 2). |
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