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LM48822 Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM48822
Description  Ground-Referenced, Ultra High PSRR, Ultra Low Noise, 35mW/Channel Stereo Headphone Amplifier with CommonMode Sense, and I2C Volume Control
PDF  22 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM48822 Datasheet(HTML) 11 Page - National Semiconductor (TI)

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30061015
FIGURE 5. Back-Driving the LM48822 Outputs
COMMON MODE SENSE
The LM48822 features a ground (common mode) sensing
feature. In noisy applications, or where the headphone jack is
used as a line out to other devices, noise pick up and ground
imbalance can degrade audio quality. The LM48822 COM in-
put senses and corrects any noise at the headphone return,
or any ground imbalance between the headphone return and
device ground, improving audio reproduction. Connect COM
directly to the headphone return terminal of the headphone
jack (Figure 6). No additional external components are re-
quired. Connect COM to GND if the common-mode sense
feature is not in use.
30061016
FIGURE 6. COM Connection Example
11
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