參數(shù)資料
型號(hào)： LM4550VH/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： 7 X 7 X 1.40 MM, LQFP-48
文件頁(yè)數(shù)： 2/30頁(yè)
文件大?。?/td> 611K
代理商： LM4550VH/NOPB
Pin Descriptions (Continued)
ANALOG I/O (Continued)
Name
Pin
I / O
Functional Description
AUX_L
14
I
Left Stereo Channel Input
This line level input (1 Vrms nominal) is selectable at the left channel of the stereo Record
Select Mux for conversion by the left channel ADC. It can also be mixed into the left channel
of the Stereo Mix 3D signal at MIX1 under the control of the Aux Volume register, 16h. The
AUX_L level can be muted (along with AUX_R) or adjusted from +12 dB to -34.5 dB in 1.5 dB
steps. Stereo Mix 3D is combined into the Stereo Mix signal at MIX2 for access to the stereo
outputs Line Out and Headphone Out.
AUX_R
15
I
Right Stereo Channel Input
This line level input (1 Vrms nominal) is selectable at the right channel of the stereo Record
Select Mux for conversion by the right channel ADC. It can also be mixed into the right
channel of the Stereo Mix 3D signal at MIX1 under the control of the Aux Volume register,
16h. The AUX_R level can be muted (along with AUX_L) or adjusted from +12 dB to -34.5 dB
in 1.5 dB steps. Stereo Mix 3D is combined into the Stereo Mix signal at MIX2 for access to
the stereo outputs Line Out and Headphone Out.
VIDEO_L
16
I
Left Stereo Channel Input
This line level input (1 Vrms nominal) is selectable at the left channel of the stereo Record
Select Mux for conversion by the left channel ADC. It can also be mixed into the left channel
of the Stereo Mix 3D signal at MIX1 under the control of the Video Volume register, 14h. The
VIDEO_L level can be muted (along with VIDEO_R) or adjusted from +12 dB to -34.5 dB in
1.5 dB steps. Stereo Mix 3D is combined into the Stereo Mix signal at MIX2 for access to the
stereo outputs Line Out and Headphone Out.
VIDEO_R
17
I
Right Stereo Channel Input
This line level input (1 Vrms nominal) is selectable at the right channel of the stereo Record
Select Mux for conversion by the right channel ADC. It can also be mixed into the right
channel of the Stereo Mix 3D signal at MIX1 under the control of the Video Volume register,
14h. The VIDEO_R level can be muted (along with VIDEO_L) or adjusted from +12 dB to
-34.5 dB in 1.5 dB steps. Stereo Mix 3D is combined into the Stereo Mix signal at MIX2 for
access to the stereo outputs Line Out and Headphone Out.
CD_L
18
I
Left Stereo Channel Input
This line level input (1 Vrms nominal) is selectable at the left channel of the stereo Input Mux
for conversion by the left channel ADC. It can also be mixed into the left channel of the
Stereo Mix 3D signal at MIX1 under the control of the CD Volume register, 12h. The CD_L
level can be muted (along with CD_R) or adjusted from +12 dB to -34.5 dB in 1.5 dB steps.
Stereo Mix 3D is mixed into the Stereo Mix signal at MIX2 for access to the stereo outputs
Line Out and Headphone Out.
CD_GND
19
I
AC Ground Reference
This input is the reference for the signals on both CD_L and CD_R. CD_GND is NOT a DC
ground and must be AC-coupled to the stereo source ground common to both CD_L and
CD_R. The three inputs CD_GND, CD_L and CD_R act together as a quasi-differential stereo
input with CD_GND providing AC common-mode feedback to reject ground noise. This can
improve the input SNR for a stereo source with a good common ground but precision
resistors may be needed in any external attenuators to achieve the necessary balance
between the two channels.
CD_R
20
I
Right Stereo Channel Input
This line level input (1 Vrms nominal) is selectable at the right channel of the stereo Input
Mux for conversion by the right channel ADC. It can also be mixed into the right channel of
the Stereo Mix 3D signal at MIX1 under the control of the CD Volume register, 12h. The
CD_R level can be muted (along with CD_L) or adjusted from +12 dB to -34.5 dB in 1.5 dB
steps. Stereo Mix 3D is combined into the Stereo Mix signal at MIX2 for access to the stereo
outputs Line Out and Headphone Out.
LM4550
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