Datasheet

LM4818
SNAS163B –APRIL 2002–REVISED MAY 2013 www.ti.com
EXTERNAL COMPONENTS DESCRIPTION
(Figure 1)
Components Functional Description
1. R
i
Combined with R
f
, this inverting input resistor sets the closed-loop gain. R
i
also forms a high pass filter with C
i
at f
c
=
1/(2πR
i
C
i
).
2. C
i
This input coupling capacitor blocks DC voltage at the amplifier's terminals. Combined with R
i
, it creates a high pass
filter with R
i
at f
c
= 1/(2πR
i
C
i
). Refer to the section, PROPER SELECTION OF EXTERNAL COMPONENTS for an
explanation of how to determine the value of C
i
.
3. R
f
Combined with R
i
, this is the feedback resistor that sets the closed-loop gain: A
v
= 2(R
F
/R
i
).
4. C
S
This is the power supply bypass capacitor that filters the voltage applied to the power supply pin. Refer to the
APPLICATION INFORMATION section for proper placement and selection of C
s
.
5. C
B
This is the bypass pin capacitor that filters the voltage at the BYPASS pin. Refer to the section, PROPER SELECTION
OF EXTERNAL COMPONENTS for information concerning proper placement and selection of C
B
.
6. C
B2
This is an optional capacitor that is not needed in the majority of applications. If the capacitor is not used, pin 3 should
be connected directly to pin2. Refer to the section PROPER SELECTION OF EXTERNAL COMPONENTS for more
information concerning C
B2
.
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