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CS3310 Scheda tecnica(PDF) 9 Page - Cirrus Logic

Il numero della parte CS3310
Spiegazioni elettronici  Stereo Digital Volume Control
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Produttore elettronici  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS3310 Scheda tecnica(HTML) 9 Page - Cirrus Logic

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CS3310
DS82F1
9
a source of distortion if the source impedance becomes appreciable relative to the reversed bi-
ased diode capacitance. Source impedances equal to or less than 600 ohms will avoid this dis-
tortion mechanism for the CS3310.
Mute
Muting can be achieved by either hardware or software control. Hardware muting is accom-
plished via the MUTE input and software muting by loading all zeroes into the volume control reg-
ister.
MUTE disconnects the internal buffer amplifiers from the output pins and terminates AOUTL and
AOUTR with 10 k
Ω resistors to ground. The mute is activated with a zero crossing detection (in-
dependent of the zero cross enable status) or an 18 ms timeout to eliminate any audible “clicks”
or “pops”. MUTE also initiates an internal offset calibration.
A software mute is implemented by loading all zeroes into the volume control register. The inter-
nal amplifier is set to unity gain with the amplifier input connected to the maximum attenuation
point of the resistive divider, AGND.
A “soft mute” can be accomplished by sequentially ramping down from the current volume control
setting to the maximum attenuation code of all zeroes.
Power-Up Considerations
Upon initial application of power, the MUTE pin of the CS3310 should be set low to initiate a pow-
er-up sequence. This sequence sets the serial shift register and the volume control register to
zero and performs an offset calibration. The device should remain muted until the supply voltag-
es have settled to ensure an accurate calibration. The device also includes an internal power-on
reset circuit that requires approximately 100 µs to settle and will ignore any attempts to address
the internal registers during this period.
The offset calibration minimizes internally generated offsets and ignores offsets applied to the
AIN pins. External clocks are not required for calibration.
Although the device is tolerant to power supply variation, the device will enter a hardware mute
state if the power supply voltage drops below approximately
±3.5 volts. A power-up sequence
will be initiated if the power supply voltage returns to greater than
±3.5 volts.
Applying power to VD+ prior to VA+ creates a SCR latch-up condition. Refer to Figure 2 for the
recommended power connections.


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