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LMC1983CIV

更新时间： 2024-02-22 16:52:31
品牌 Logo 应用领域
美国国家半导体 - NSC 商用集成电路
页数 文件大小 规格书
14页 335K
描述
Digitally-Controlled Stereo Tone and Volume Circuit with Three Selectable Stereo Inputs

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中文翻译

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LMC1983CIV 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
包装说明：QCCJ, LDCC28,.5SQReach Compliance Code：unknown
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.77Is Samacsys：N
信道分离：80 dB商用集成电路类型：TONE CONTROL CIRCUIT
谐波失真：0.5%JESD-30 代码：S-PQCC-J28
JESD-609代码：e0长度：11.43 mm
频带数量：2信道数量：2
功能数量：1端子数量：28
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：PLASTIC/EPOXY封装代码：QCCJ
封装等效代码：LDCC28,.5SQ封装形状：SQUARE
封装形式：CHIP CARRIER峰值回流温度（摄氏度）：NOT SPECIFIED
电源：9 V认证状态：Not Qualified
座面最大高度：4.57 mm子类别：Audio Control ICs
最大压摆率：25 mA最大供电电压 (Vsup)：12 V
最小供电电压 (Vsup)：6 V表面贴装：YES
技术：CMOS温度等级：INDUSTRIAL
端子面层：Tin/Lead (Sn/Pb)端子形式：J BEND
端子节距：1.27 mm端子位置：QUAD
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：11.43 mm
Base Number Matches：1

LMC1983CIV 数据手册

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C3 and C2 sets the mid-frequency gain. Symmetrical tone  
Application Information (Continued)  
=
response is achieved when C2  
C3. However, with  
=
EXTERNAL SIGNAL PROCESSING  
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 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.  
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  
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).  
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  
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  
DS011279-5  
FIGURE 3. System Block Diagram Utilizing the External Processing Loop (One Channel Shown)  
www.national.com  
10  
1...7891011121314

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