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CS3301A-IS Scheda tecnica(PDF) 11 Page - Cirrus Logic |
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CS3301A-IS Scheda tecnica(HTML) 11 Page - Cirrus Logic |
11 / 16 page CS3301A DS757F1 11 made using the MUX0 and MUX1 pins as shown in Table 1 on page 7. Although a mux selection is provided to enable the INA and INB switches simultaneously, signal cur- rent should not be driven through them in this mode. The CS3301A mux switches will maintain good linearity only with minimal signal currents. 2.2.4 Power Down Selection A power-down mode is available to shut down the amplifier when not in use. When enabled, all inter- nal circuitry is disabled, the analog inputs and out- puts go high-impedance, and the device enters a micro-power state. Power down mode is selected using the PWDN pin, which is active high. 2.3 Power Supplies 2.3.1 Analog Power Supplies The analog power pins of the CS3301A are speci- fied to run from bipolar ±2.5 V power supplies. When using bipolar power supplies, the analog sig- nal common mode voltage should be biased to 0 V. The analog power supplies are recommended to be bypassed to system ground using 0.1 µF X7R type capacitors. The VA- supply is connected to the CMOS sub- strate and as such must remain the most negative applied voltage. It is recommended to clamp the VA- supply to system ground using a reversed bi- ased Schottky diode to prevent possible damage re- lated to mis-matched power supply initialization. 2.3.2 Digital Power Supplies The digital voltage across the VD and GND pins is specified for a +3.3 V power supply. The digital power supply should be bypassed to system ground using a 0.01 µF X7R type capacitor. |
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