LM1036N National Semiconductor, LM1036N Datasheet - Page 7

• Manufacturer Part Number: LM1036N
• Description: Audio Power Amplifier IC
• Manufacturer: National Semiconductor

Specifications of LM1036N

• No. Of Channels: 2
• Amplifier Case Style: DIP
• No. Of Pins: 20
• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Mounting Type: Through Hole
• Package / Case: 20-DIP
• No. Of Amplifiers: 2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Applications Information
FIGURE 4. Tone Characteristic (Gain vs Frequency)
FIGURE 5. Tone Characteristic (Gain vs Frequency)
FIGURE 6. Tone Characteristic (Gain vs Frequency)
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Figure 8 and Figure 9 illustrate the loudness characteristics
obtained with C
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 7 (loudness) and 12 (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 7 towards the control refer-
ence voltage (pin 17). 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
reduce the rate of onset of control to extend the active range
to −50 dB volume control and below.
The control on pin 7 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
between pins 12 and 7, the onset of loudness control and its
rate of change may be readily modified.
FIGURE 7. Loudness Compensated Volume
FIGURE 8. Loudness Compensated Volume
b
changed to C
Characteristic
Characteristic
b
/2 and C
b
/4 respectively, C
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