lmc835 National Semiconductor Corporation, lmc835 Datasheet - Page 15

• Manufacturer Part Number: lmc835
• Description: Digital Controlled Graphic Equalizer
• Manufacturer: National Semiconductor Corporation

Application Hints
REDUCING EXTERNAL COMPONENTS
The typical application shown in Figure 7 is switching noise
free The DC-coupled circuit in Figure 16 is also switching
noise free except at 12 dB 6 dB switch turn ON OFF This
switching noise is caused by the I
AC COUPLING
MODEL
(Continued)
bias
and V
FIGURE 16 Reducing External Components
offset
TL H 6753 – 21
TL H 6753 – 23
FIGURE 15 Effect of R
of the op
15
amps Selecting a low I
the switching noise due to the 12 dB 6 dB switch The DC-
coupled application can also eliminate the R
tors with only a 0 5 dB gain error at 12 dB boost or cut
LEAK
DC COUPLING
bias
RESULT
and V
offset
op amp can minimize
F
e
TL H 6753 – 22
100k resis-
TL H 6753 – 24