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LMC1982CIV データシート(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LMC1982CIV
部品情報  Digitally-Controlled Stereo Tone and Volume Circuit with Two Selectable Stereo Inputs
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMC1982CIV データシート(HTML) 7 Page - National Semiconductor (TI)

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Pin Description (Continued)
TABLE 1. IM Bus Programming Codes for LMC1982
Address
Function
Data
Function
(A7–A0)
Selected
01000000
Input Select + Mute
XXXXXX00
INPUT1
XXXXXX01
INPUT2
XXXXXX10
N/A
XXXXXX11
MUTE
01000001
Loudness, Enhanced Stereo
XXXXXX00
Loudness OFF
Enhanced Stereo OFF
XXXXXX01
Loudness ON
Enhanced Stereo OFF
XXXXXX10
Loudness OFF
Enhanced Stereo ON
XXXXXX11
Loudness ON
Enhanced Stereo ON
01000010
Bass
XXXX0000
−12 dB
XXXX0011
−6 dB
XXXX0110
FLAT
XXXX1001
+6 dB
XXXX11XX
+12 dB
01000011
Treble
XXXX0000
−12 dB
XXXX0011
−6 dB
XXXX0110
FLAT
XXXX1001
+6 dB
XXXX11XX
+12 dB
01000100
Left Volume
XX000000
0 dB
XX010100
−40 dB
XX101XXX
−80 dB
XX11XXXX
−80 dB
01000101
Right Volume
XX000000
0 dB
XX010100
−40 dB
XX101XXX
−80 dB
XX11XXXX
−80 dB
01000110
Mode Select
XXXXX100
Left Mono
XXXXX101
Stereo
XXXXX11X
Right Mono
01000111
Read Digital Input 1
XXXXXXD1D0
D0 = Digital Input 1
or
D1 = Digital Input 2
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
7


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