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CDB44L11 Folha de dados(PDF) 5 Page - Cirrus Logic

Nome de Peças CDB44L11
Descrição Electrónicos  Evaluation Board for the CS44L11
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Fabricante Electrônico  CIRRUS [Cirrus Logic]
Página de início  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CDB44L11 Folha de dados(HTML) 5 Page - Cirrus Logic

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CDB44L11
DS640DB1
5
switching current. In most designs this may be omitted due to other system components loading
the supply line and dissipating the current. The resistive load is only used to simulate a circuit
load.
In the CS44L11, the output MOSFETs directly switch between ground and VA_HP, therefore the
performance of the audio output from the amplifier is adversely affected any disturbance on the
power rails. To get the best performance power supply characteristics and power supply de-cou-
pling are critical.
Dynamic Range will be affected by switching noise. To reduce switching noise large value power
supply bypass capacitors must be used. This circuit uses a 0.1 µF and 1.0 µF ceramic capacitor
as well as a 100 µF low ESR tantalum capacitor between the VA_HP supply rail and ground. Op-
timally these should be placed as close to the CS44L11 pins 12 and 13 as possible. If a DC-DC
converter is used in the system its switching frequency should be locked to the CS44L11 PWM
switching frequency to reduce switching noise.
Power supply source impedance has a direct affect on the output distortion. A DC-DC converter
is a very low impedance source and will offer the best THD+N performance. Using a linear power
supply offers the next lowest impedance, while running directly from batteries to the VA_HP pins
offers the highest impedance and therefore the highest distortion.
A 47 µH inductor (L1) is used on the digital power supply of the CS44L11 to suppress noise. This
may be omitted if system noise is not an issue in your design.


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