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參數(shù)資料
| 型號： | LMC1983CIV |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻控制 |
| 英文描述： | Digitally-Controlled Stereo Tone and Volume Circuit with Three Selectable Stereo Inputs |
| 中文描述： | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大小： | 331K |
| 代理商： | LMC1983CIV |
Application Information
(Continued)
EXTERNAL SIGNAL PROCESSING
The SELECT OUT pins (7 and 22) enable greater system
design flexibility by providing a means to implement an ex-
ternal processing loop. This loop can be used for noise re-
duction circuits such as DNR (LM1894) or multi-band
graphic equalizers (LMC835). If both are used, it is important
to ensure that the noise reduction circuitry precede the
equalization circuits. Failure to do so results in improper op-
eration of the noise reduction circuits. The system shown in
Figure 3 utilizes the external loop to include DNR and a
multi-band equalizer.
TONE CONTROL RESPONSE
Bass and treble tone controls are included in the LMC1983.
The tone controls use just two external capacitors for each
stereo channel. Each has a corner frequency determined by
the value of C2 and C3 (see Figure 4 ) and internal resistors
in the feedback loop of the internal tone amplifier. The
maximum-boost or cut is determined by the data sent to the
LMC1983 (see Table 1).
The typical tone control response shown in Typical Perfor-
mance Curves were generated with C2 = C3 = 0.0082 μF
and show the response for each step. When modifying the
tone control response it is important to note that the ratio of
C3 and C2 sets the mid-frequency gain. Symmetrical tone
response is achieved when C2 = C3. However, with
C2 = 2(C3) and the tone controls set to “flat”, the frequency
response will be flat at 20 Hz and 20 kHz, and +6 dB at
1 kHz.
The frequency where a tone control begins to deviate from a
flat response is referred to as the turn-over frequency. With
C = C2 = C3, the LMC1983’s treble turn-over frequency is
nominally
The bass turn-over frequency is nominally
when maximum boost is chosen. The inflection points (the
frequencies where the boost or cut is within 3 dB of the final
value) are for treble and bass
DS011279-5
FIGURE 3. System Block Diagram Utilizing the External Processing Loop (One Channel Shown)
www.national.com
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