CS3301A datasheet(11/16 Pages) CIRRUS

11 / 16 page

CS3301A

DS757F1

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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