MAX98090BEWJ+T Maxim Integrated, MAX98090BEWJ+T Datasheet - Page 142

• Manufacturer Part Number: MAX98090BEWJ+T
• Description: Interface - CODECs 5V 130mW Stereo Headphone Amp
• Manufacturer: Maxim Integrated

MAX98090
Table 75. Zero-Crossing Detection and Volume Smoothing Configuration Register
Volume smoothing is available on all analog output PGAs.
When enabled, all volume changes are broken into the
smallest available step size. The volume is then ramped
through each step between the initial and final volume set-
ting at a rate of one step every 1ms. Volume smoothing
also occurs at device turn-on and turn-off. During turn-on,
the volume is first set to mute before the output is enabled.
Once enabled, mute is first disabled and then the volume
is ramped to the programmed level. At turn-off, the volume
is ramped down to the minimum gain, and then muted,
before the outputs are disabled. If zero-crossing detection
is enabled, each volume step occurs at a zero crossing.
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BIT
7
6
5
4
3
2
1
0
ADDRESS: 0x40
VS2EN
NAME
ZDEN
VSEN
—
—
—
—
—
TYPE POR
R/W
R/W
R/W
—
—
—
—
—
—
—
—
—
—
0
0
0
Zero-Crossing Detection
Enhanced Volume Smoothing
Volume Adjustment Smoothing
0: Volume changes made only at zero crossings or after approximately 100ms.
1: Volume changes made immediately upon request.
Only valid is volume adjustment smoothing is enabled (VSEN = 0).
0: Each volume change waits until the previous volume step has been applied to the
output. Allows volume smoothing to function with zero-crossing timeout.
1: Volume smoothing enhancement is disabled.
0: Volume changes are smoothed by stepping through intermediate levels.
1: Volume changes are made directly in a single step.
When no audio signal is present, zero-crossing detection
can timeout and prevent volume smoothing from occur-
ring. Enable enhanced volume smoothing to prevent the
volume controller from requesting another volume step
until the previous step has been set. Each step in the
volume ramp then occurs either after a zero crossing has
occurred in the audio signal or after the timeout window
has expired. During turn-off, enhance volume smoothing
is always disabled.
Ultra-Low Power Stereo Audio Codec
DESCRIPTION
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