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參數(shù)資料
| 型號(hào)： | LM4550VH/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 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)： | 3/30頁(yè) |
| 文件大?。?/td> | 611K |
| 代理商： | LM4550VH/NOPB |
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Pin Descriptions (Continued)
ANALOG I/O (Continued)
Name
Pin
I / O
Functional Description
MIC1
21
I
Mono microphone input
Either MIC1 or MIC2 can be muxed to a programmable boost amplifier with selection by the
MS bit (bit D8) in the General Purpose register, 20h. The boost amplifier gain (0 dB or 20 dB)
is set by the 20dB bit (D6) in the Mic Volume register, 0Eh. Nominal input levels at the two
gain settings are 1 Vrms and 0.1 Vrms respectively. The amplifier output is selectable (Record
Select register, 1Ah) by either the right or left channels of the Record Select Mux for
conversion on either or both channels of the stereo ADC. The amplifier output can also be
accessed at the stereo mixer MIX1 (muting and mixing adjustments via Mic Volume register,
0Eh) where it is mixed equally into both left and right channels of Stereo Mix 3D for access to
the stereo outputs Line Out and Headphone Out. Access to the Mono analog output is
selected by a mux controlled by the MIX bit (D9) in General Purpose register, 20h.
MIC2
22
I
Mono microphone input
Either MIC1 or MIC2 can be muxed to a programmable boost amplifier with selection by the
MS bit (bit D8) in the General Purpose register, 20h. The boost amplifier gain (0 dB or 20 dB)
is set by the 20dB bit (D6) in the Mic Volume register, 0Eh. Nominal input levels at the two
gain settings are 1 Vrms and 0.1 Vrms respectively. The amplifier output is selectable (Record
Select register, 1Ah) by either the right or left channels of the Record Select Mux for
conversion on either or both channels of the stereo ADC. The amplifier output can also be
accessed at the stereo mixer MIX1 (muting and mixing adjustments via Mic Volume register,
0Eh) where it is mixed equally into both left and right channels of Stereo Mix 3D for access to
the stereo outputs Line Out and Headphone Out. Access to the Mono analog output is
selected by a mux controlled by the MIX bit (D9) in General Purpose register, 20h.
LINE_IN_L
23
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 Line In Volume register, 10h. The
LINE_IN_L level can be muted (along with LINE_IN_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.
LINE_IN_R
24
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 Line In Volume register, 10h. The
LINE_IN_R level can be muted (along with LINE_IN_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.
LINE_OUT_L
35
O
Left Stereo Channel Output
This line level output (1 Vrms nominal) is fed from the left channel of the Stereo Mix signal
from MIX2 via the Master Volume register, 02h. The LINE_OUT_L amplitude can be muted
(along with LINE_OUT_R) or adjusted from 0 dB to -46.5 dB in 1.5 dB steps.
LINE_OUT_R
36
O
Right Stereo Channel Output
This line level output (1 Vrms nominal) is fed from the right channel of the Stereo Mix signal
from MIX2 via the Master Volume register, 02h. The LINE_OUT_R amplitude can be muted
(along with LINE_OUT_L) or adjusted from 0 dB to -46.5 dB in 1.5 dB steps.
MONO_OUT
37
O
Mono Output
This mono line level output (1 Vrms nominal) is fed from either a microphone input (MIC1 or
MIC2, after boost amplifier) or from the mono sum of the left and right Stereo Mix 3D
channels from MIX1. The optional National 3D Sound enhancement can be disabled (default)
by the 3D bit (bit D13) in the General Purpose register, 20h. Choice of input is by the MIX bit
(D9) in the same register. MIX=0 selects a microphone input. Output level can be muted or
adjusted from 0 dB to -46.5 dB in 1.5 dB steps via the Mono Volume register, 06h.
LM4550
www.national.com
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