LM4700 National Semiconductor, LM4700 Datasheet - Page 14

• Manufacturer Part Number: LM4700
• Description: Overture Audio Power Amplifier Series 30W Audio Power Amplifier with Mute and Standby Modes
• Manufacturer: National Semiconductor

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Application Information
ter than the required
a low and high frequency pole of 4 Hz and 100 kHz respec-
tively. As stated in the External Components section, R
conjunction with C
C
I
1/(2
*
1 k
I
create a high-pass filter.
±
0.25 dB specified. This fact results in
*
4 Hz) = 39.8 µF; use 39 µF.
(Continued)
I
in
14
The high frequency pole is determined by the product of the
desired high frequency pole, f
less than the minimum GBWP of 5 MHz for the LM4700. This
will ensure that the high frequency response of the amplifier
will be no worse than 0.17 dB down at 20 kHz which is well
within the bandwidth requirements of the design.
= 21 and f
H
= 100 kHz, the resulting GBWP of 2.1 MHz is
H
, and the gain, A
V
. With a A
V