CS4811-KM datasheet(18/24 Pages) CIRRUS

18 / 24 page

CS4811

DS486PP2

Power Supply

VA - Analog Power

Power: analog supply, +5 V.

AGND - Analog Ground

Ground: analog ground.

VD - Digital Power

Power: digital supply, +5 V.

DGND - Digital Ground

Ground: digital ground.

Analog Input

AIN+/- - Differential Audio Input

Inputs: These pins accept differential analog input signals and are biased to the internal reference

voltage of approximately 2.3 V. The + and - input signals should be 180° out of phase resulting in a

nominal differential input voltage of twice the input pin voltage. A single-ended signal may also be

directly applied to either the + or - input with the other input AC coupled to ground through a capacitor.

In general, differential input signals provide better performance.

However, singled-ended inputs may

result in reduced cost. Inputs may be AC or DC coupled. DC coupled input signals must be biased at

2.3 V. Any remaining DC offset is removed by an internal digital HPF. For best performance, a passive

anti-aliasing filter is required. The typical connection diagram in Figure 3. shows the recommended

single-ended input circuit. Figure 6 shows the recommended differential input circuit.

OVL - ADC Overload Indicator

Output: This pin is asserted when the ADC is clipping. The pin does not latch and de-asserts when

clipping stops.

Analog Output

AOUT+/- - Differential Audio Output

Outputs: These pins output differential analog signals which are biased to the internal reference voltage

of approximately 2.3 V. The + and - output signals are 180° out of phase resulting in a nominal

differential output voltage of twice the output pin voltage. For best performance, an anti-imaging filter is

required. Figure 7 shows the recommended second and third order Butterworth differential-to-single-

ended output buffer circuits.

CS4811-KM Datasheet(PDF) 18 Page - Cirrus Logic