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CS43L43-KZ Datasheet(PDF) 10 Page - Cirrus Logic

Part # CS43L43-KZ
Description  Low Voltage,Stereo DAC With Headphone Amp
Download  36 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS43L43-KZ Datasheet(HTML) 10 Page - Cirrus Logic

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CS43L43
10
DS479PP3
3.6.1 Power-up
When the device is initially powered-up, the audio outputs, HP_A and HP_B, are clamped to GND.
Following a delay of approximately 1000 sample periods, each output begins to ramp toward the qui-
escent voltage. Approximately 10,000 LRCK cycles later, the outputs reach VQ and audio output be-
gins. This gradual voltage ramping allows time for the external DC-blocking capacitors to charge to
the quiescent voltage, minimizing the power-up transient.
3.6.2 Power-down
To prevent transients at power-down, the device must first enter its power-down state by setting the
RST pin low. When this occurs, audio output ceases and the internal output buffers are disconnected
from HP_A and HP_B. In their place, a soft-start current sink is substituted which allows the
DC-blocking capacitors to slowly discharge. Once this charge is dissipated, the power to the device
may be turned off and the system is ready for the next power-on.
3.6.3 Discharge Time
To prevent an audio transient at the next power-on, the DC-blocking capacitors must fully discharge
before turning on the power or exiting the power-down state. If full discharge does not occur, a tran-
sient will occur when the audio outputs are initially clamped to GND. The time that the device must
remain in the power-down state is related to the value of the DC-blocking capacitance and the output
load. For example, with a 220 µF capacitor and a 16
Ω load, the minimum power-down time will be
approximately 0.4 seconds.


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