CS4811 Cirrus Logic, CS4811 Datasheet - Page 18

• Manufacturer Part Number: CS4811
• Description: Fixed Function Multi-Effects Audio Processor
• Manufacturer: Cirrus Logic

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Power Supply
Analog Input
Analog Output
18
VA - Analog Power
AGND - Analog Ground
VD - Digital Power
DGND - Digital Ground
AIN+/- - Differential Audio Input
OVL - ADC Overload Indicator
AOUT+/- - Differential Audio Output
Power: analog supply, +5 V.
Ground: analog ground.
Power: digital supply, +5 V.
Ground: digital ground.
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.
Output: This pin is asserted when the ADC is clipping. The pin does not latch and de-asserts when
clipping stops.
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
DS486PP2