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MAX4468 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4468 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page common mode. The ratio of these voltages is called the common-mode gain. The common-mode rejection ratio is the ratio of differential-mode gain to common-mode gain. The high CMRR properties of the MAX4465–MAX4469 provide outstanding performances when configured as a noninverting microphone pream- plifier. Power-Up The MAX4465–MAX4469 outputs typically settle within 1µs after power-up. Figure 6 shows the output voltage on power-up. Power Supplies and Layout The MAX4465–MAX4469 operate from a single +2.4V to +5.5V power supply. Bypass the power supply with a 0.1µF capacitor to ground. Good layout techniques are necessary for the MAX4465–MAX4469 family. To decrease stray capacitance, minimize trace lengths by placing external components close to the op amp’s pins. Surface-mount components are recommended. In systems where analog and digital grounds are avail- able, the MAX4465–MAX4469 should be connected to the analog ground. Test Circuits/Timing Diagrams Figure 2. MAX4466 Typical Application Circuit ELECTRET CAPSULE VCC = +5V MAX4466 2k Ω 10k Ω GND 100k Ω 100pF 1M Ω +5V +5V 1M Ω 2k Ω 0.1 µF 0.01 µF 1 µF 1 5 2 4 3 IN+ IN- OUT Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown 8 1V/div 100 µs/div Figure 1. Rail-to-Rail Output Operation |
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