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LM4450B bảng dữ liệu(PDF) 4 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LM4550B AC 97 Rev 2.1 Multi-Channel Audio Codec With Stereo Headphone Amplifier, Sample Rate Conversion and TI 3D Sou
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DVDD1
XTL_OUT
SDATA_OUT
48
1
47 46
2
3
4
5
XTL_IN
DVSS1
45
6
7
8
9
10
11
12
LM4550B
$&µ97 Rev 2.1
Codec
36
35
34
33
32
31
30
29
28
27
26
25
BIT_CLK
SDATA_IN
SYNC
RESET#
PC_BEEP
DVDD2
DVSS2
LINE_OUT_R
3DP
NC
LINE_OUT_L
3DN
NC
NC
AVSS1
NC
VREF
VREF_OUT
AVDD1
44 43 42 41 40 39 38 37
13 14 15 16 17 18 19 20 21 22 23 24
LM4550B
SNAS276G – MAY 2005 – REVISED SEPTEMBER 2015
www.ti.com
6 Pin Configuration and Functions
PR Package
48-Pin LQFP
Top View
Pin Functions
PIN
I/O
DESCRIPTION
NAME
NO.
Mono Input
This line level (1 Vrms nominal) mono input is mixed equally into both channels of the Stereo Mix
signal at MIX2 under the control of the PC_Beep Volume control register, 0Ah. The PC_BEEP level
can be muted or adjusted from 0 dB to –45 dB in 3-dB steps. The Stereo Mix signal feeds both the
PC_BEEP
12
I
Line Out and Headphone Out analog outputs and is also selectable at the Record Select Mux. During
Initialization or Cold Reset, (reset pin held active low), PC_BEEP is switched directly to both channels
of the Line Out stereo output, bypassing all volume controls. This allows signals such as PC power-on
self-test tones to be heard through the PC's audio system before the codec registers are configured.
Mono Input
This line level (1 Vrms nominal) mono input is selectable at the Record Select Mux for conversion by
either or both channels of the stereo ADC. It can also be mixed equally into both channels of the
PHONE
13
I
Stereo Mix signal at MIX2 under the control of the Phone Volume register, 0Ch. The PHONE level can
be muted or adjusted from 12 dB to –34.5 dB in 1.5-dB steps. The Stereo Mix signal feeds both the
Line Out and Headphone Out analog stereo outputs and is also selectable at the Record Select Mux.
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
AUX_L
14
I
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.
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
AUX_R
15
I
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.
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
VIDEO_L
16
I
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.
4
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