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參數(shù)資料
| 型號： | LMC1982 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Digitally-Controlled Stereo Tone and Volume Circuit with Two Selectable Stereo Inputs |
| 中文描述： | 數(shù)字控制音調(diào)和音量立體聲電路的兩個可選立體聲輸入 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 348K |
| 代理商： | LMC1982 |
Pin Description
(Continued)
TABLE 1. IM Bus Programming Codes for LMC1982
Address
(A7–A0)
01000000
Function
Data
Function
Selected
INPUT1
INPUT2
N/A
MUTE
Loudness OFF
Enhanced Stereo OFF
Loudness ON
Enhanced Stereo OFF
Loudness OFF
Enhanced Stereo ON
Loudness ON
Enhanced Stereo ON
12 dB
6 dB
FLAT
+6 dB
+12 dB
12 dB
6 dB
FLAT
+6 dB
+12 dB
0 dB
40 dB
80 dB
80 dB
0 dB
40 dB
80 dB
80 dB
Left Mono
Stereo
Right Mono
D0 = Digital Input 1
D1 = Digital Input 2
Input Select + Mute
XXXXXX00
XXXXXX01
XXXXXX10
XXXXXX11
XXXXXX00
01000001
Loudness, Enhanced Stereo
XXXXXX01
XXXXXX10
XXXXXX11
01000010
Bass
XXXX0000
XXXX0011
XXXX0110
XXXX1001
XXXX11XX
XXXX0000
XXXX0011
XXXX0110
XXXX1001
XXXX11XX
XX000000
XX010100
XX101XXX
XX11XXXX
XX000000
XX010100
XX101XXX
XX11XXXX
XXXXX100
XXXXX101
XXXXX11X
XXXXXXD1D0
01000011
Treble
01000100
Left Volume
01000101
Right Volume
01000110
Mode Select
01000111
Read Digital Input 1
or
Digital Input 2
on IM Bus
General Information
The LMC1982 is a CMOS/bipolar building block intended for
high fidelity audio signal processing. It is designed for line
level inputs signals (300 mV 2V) and has a maximum gain
of 0.5 dB. While the LMC1982 is manufactured with CMOS
processing, NPN transistors are used to build low noise op
amps. The combination of CMOS switches, bipolar op amps,
and poly-silicon resistors make it possible to achieve an or-
der of magnitude quality improvement over other bipolar cir-
cuits that use analog multipliers to accomplish gain adjust-
ment. Internal circuits set the volume to minimum, tone
controls to flat, the mute to on, and all other functions off
when power is first applied. Individual left and right volume
controls are software programmed to achieve the stereo bal-
ance function. Figure 1 shows the connection diagram of a
typical LMC1982 application.
The LMC1982 has internal decoding logic that allows a mi-
croprocessor (μP) or microcontroller (μC) to communicate di-
rectly to the audio control circuitry through an INTERMETAL
(IM) Bus interface. This three-wire interface consists of a
bi-directional DATA line, a Clock (CLK) input line, and an
Identity (ID) line. Address and function selection data (8 bits)
www.national.com
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| LMC1982CIN | Digitally-Controlled Stereo Tone and Volume Circuit with Two Selectable Stereo Inputs |
| LMC1982CIV | Digitally-Controlled Stereo Tone and Volume Circuit with Two Selectable Stereo Inputs |
| LMC1983 | Digitally-Controlled Stereo Tone and Volume Circuit with Three Selectable Stereo Inputs |
| LMC1983CIN | Pushbutton Switch; Actuator Style:Rectangular; Circuitry:DPST-1NO/1NC; Switch Operation:On-(On); Contact Current Max:5A; Collar Shape:Rectangular; Features:Illuminated; Leaded Process Compatible:Yes; Mounting Type:PCB |
| LMC1983CIV | Digitally-Controlled Stereo Tone and Volume Circuit with Three Selectable Stereo Inputs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMC1982BJ WAF | 制造商:Texas Instruments 功能描述: |
| LMC1982CIN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Digitally-Controlled Stereo Tone and Volume Circuit with Two Selectable Stereo Inputs |
| LMC1982CIV | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Digitally-Controlled Stereo Tone and Volume Circuit with Two Selectable Stereo Inputs |
| LMC1982CIVX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Tone/Volume/Balance Control |
| LMC1983 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Digitally-Controlled Stereo Tone and Volume Circuit with Three Selectable Stereo Inputs |
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