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參數(shù)資料
| 型號： | LM4610N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Dual DC Operated Tone/Volume/Balance Circuit with National 3-D Sound |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP24 |
| 封裝： | DIP-24 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 393K |
| 代理商： | LM4610N |
Applications Information
(Continued)
Figure 8 and Figure 9 illustrate the loudness characteristics
obtained with C
changed to C
/2 and C
/4 respectively, C
t
being kept at the nominal 0.01 μF. These values naturally
modify the bass tone response as in Figure 2 and Figure 3
With pins 9 (loudness) and 14 (volume) directly connected,
loudness control starts at typically 8 dB volume, with most
of the control action complete by 30 dB.
Figure 10 and Figure 11 show the effect of resistively offset-
ting the voltage applied to pin 9 towards the control refer-
ence voltage (pin 19). Because the control inputs are high
impedance, this is easily done and high value resistors may
be used for minimal additional loading. It is possible to re-
duce the rate of onset of control to extend the active range to
50 dB volume control and below.
The control on pin 9 may also be divided down towards
ground bringing the control action on earlier. This is illus-
trated in Figure 12 With a suitable level shifting network be-
tween pins 14 and 9, the onset of loudness control and its
rate of change may be readily modified.
When adjusted for maximum boost in the usual application
circuit, the LM4610 cannot give additional boost from the
loudness control with reducing gain. If it is required, some
additional boost can be obtained by restricting the tone con-
trol range and modifying C
, C
, to compensate. A circuit il-
lustrating this for the case of bass boost is shown in Figure
13. The resulting responses are given in Figure 14 showing
the continuing loudness control action possible with bass
boost previously applied.
DS101125-10
FIGURE 7. Loudness Compensated Volume
Characteristic
DS101125-11
FIGURE 8. Loudness Compensated Volume
Characteristic
DS101125-12
FIGURE 9. Loudness Compensated Volume
Characteristic
DS101125-13
FIGURE 10. Loudness Compensated Volume
Characteristic
DS101125-14
FIGURE 11. Loudness Compensated Volume
Characteristic
DS101125-15
FIGURE 12. Loudness Compensated Volume
Characteristic
www.national.com
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