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參數(shù)資料
| 型號(hào)： | LMC1992 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | LMC1992 Digitally-Controlled Stereo Tone and Volume Circuit with Four-Channel Input-Selector |
| 中文描述： | LMC1992數(shù)控立體聲音調(diào)和音量電路四通道輸入選擇 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 260K |
| 代理商： | LMC1992 |
Applications Information
(Continued)
TABLE I. Programming Codes for LMC1992
Address
A1
Function
Data
Values
A2
A0
D5
D4
D3
D2
D1
D0
1
1
1
Left Rear Fader
X
MSB
N
N
N
LSB
b
40 dB
e
X00000
b
20 dB
e
X01010
0 dB
e
X1010X
1
1
0
Right Rear Fader
X
MSB
N
N
N
LSB
b
40 dB
e
X00000
b
20 dB
e
X01010
0 dB
e
X1010X
1
0
1
Left Front Fader
X
MSB
N
N
N
LSB
b
40 dB
e
X00000
b
20 dB
e
X01010
0 dB
e
X1010X
1
0
0
Right Front Fader
X
MSB
N
N
N
LSB
b
40 dB
e
X00000
b
20 dB
e
X01010
0 dB
e
X1010X
0
1
1
Volume
MSB
N
N
N
N
LSB
b
80 dB
e
000000
b
40 dB
e
010100
0 dB
e
10100X
0
1
0
Treble
X
X
MSB
N
N
LSB
b
12 dB
e
XX0000
FLAT
e
XX0110
a
12 dB
e
XX1100
0
0
1
Bass
X
X
MSB
N
N
LSB
b
12 dB
e
XX0000
FLAT
e
XX0110
a
12 dB
e
XX1100
0
0
0
Input Select
X
X
0
MSB
N
LSB
OPEN
e
XX0000
INPUT1
e
XX0001
INPUT2
e
XX0010
INPUT3
e
XX0011
INPUT4
e
XX0100
Note 1:
All attenuators 2 dB/step.
Note 2:
Tone controls 2 dB/step
@
100 Hz and 10 kHz.
Note 3:
Use of data that deviates from the values shown in the table may result in erroneous results.
SERIAL DATA FORMAT
Table I displays the required data format needed by the
LMC1992. Not shown is the 2-bit device address (10).
These two bits of information must precede the final nine-
bits used as the data word. The first three of these nine bits
is the function address.
The VOLUME, TONE, and FADER controls are designed to
increment their settings (in 2 dB steps) as the control data is
incremented by one LSB. Disregarding the device address
and the function address, the VOLUME input code increas-
es from 000000 (
b
80 dB) to 10100X (0 dB). The TONE
controls’ input code increases from XX0000 (
b
12 dB) to
XX0110 (0 dB) to XX1100 (
a
12 dB). The code for the FAD-
ERs starts from X00000 (
b
40 dB) and goes to X1010X
(0 dB).
The table shows that VOLUME is the only function that uses
all six bits to choose that function’s setting. The remaining
functions use less than six bits; the unused bits are shown
as ‘‘X’’s (‘‘don’t care’’). While these ‘‘don’t care’’ bits have
no effect on their respective function, the LMC1992 must
receive them for proper operation. If neglected, erroneous
or unknown results will occur.
10
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