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LMC1982CIV データシート(PDF) 7 Page - National Semiconductor (TI) |
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LMC1982CIV データシート(HTML) 7 Page - National Semiconductor (TI) |
7 / 14 page 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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