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MAX4061ETA Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4061ETA Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 17 page Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown 8 _______________________________________________________________________________________ Pin Description PIN MAX4060 MAX4061 MAX4062 NAME FUNCTION 1— 2 INT/AUX Internal (Differential) or Auxiliary (Single-Ended) Input Select. Drive INT/AUX low to select internal or high to select auxiliary microphone input. 23 3 OUT Amplifier Output. OUT is high impedance when in shutdown mode. 3— — BIAS External Electret Microphone Capsule Bias Output. BIAS has a greater than 2k Ω output impedance. 44 5 VCC Power Supply. Bypass the VCC to GND with a 0.1µF capacitor. 55 6 IN+ Noninverting Differential Amplifier Input. AC-couple the audio signal into IN+. 66 7 IN- Inverting Differential Amplifier Input. AC-couple the audio signal into IN-. 77 8 GND Ground 8— 9 AUX_IN Single-Ended Input for Auxiliary Microphone. AC-couple the audio signal into AUX_IN. —1 1 G2 Gain-Selectable Input. Connect an external resistor between G1 and G2 to set the gain for the differential amplifier. (See Adjustable Differential-Gain Setting section.) —2 — SHDN Shutdown Input. Drive SHDN high for normal operation. Drive SHDN low for shutdown mode. —— 4 BIAS External Electret Microphone Capsule Bias Output Bypass BIAS with 1µF Capacitor to Ground —8 10 G1 Gain-Selectable Input. Connect an external resistor between G1 and G2 to set the gain for the differential amplifier. Detailed Description The MAX4060/MAX4061/MAX4062 are differential micro- phone preamplifiers providing high-quality audio, opti- mized for use in computer and mobile applications. These devices feature rail-to-rail outputs, very high power-supply rejection, and common-mode rejection, making them ideal for low-noise applications. The MAX4060/MAX4061/MAX4062 are particularly effective when layout constraints force the microphone amplifier to be physically remote from the ECM microphone and/or the rest of the audio circuitry. The MAX4060/MAX4062 are capable of switching their output between the differential input and an inverting single-ended input. INT/AUX selects either the differen- tial input or single-ended auxiliary input. In addition, the MAX4060/MAX4061 have an internal bias generator to bias the microphone in either differential or single- ended modes. The MAX4061 includes a complete 0.3µA shutdown mode for ultimate power savings. The differential gain of the MAX4061/MAX4062 is set with a single resistor connected between the G1 and G2 pins. The MAX4060 has a fixed gain of 10V/V. Differential Input The main microphone input is a low-noise, differential input structure. This is an almost essential element when faced with amplification of low-amplitude analog signals in digitally intense environments such as note- 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 can be placed physically further apart, easing PC board layout restrictions. |
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