Datasheet

LM4890
www.ti.com SNAS138L –SEPTEMBER 2001–REVISED MAY 2013
External Components Description
(See Figure 7)
Components Functional Description
1. R
IN
Inverting input resistance which sets the closed-loop gain in conjunction with R
f
. This resistor also forms a high pass
filter with C
IN
at f
C
= 1/(2π R
IN
C
IN
).
2. C
IN
Input coupling capacitor which blocks the DC voltage at the amplifier's input terminals. Also creates a highpass filter
with R
IN
at f
c
= 1/(2π R
IN
C
IN
). Refer to the section, Proper Selection of External Components, for an explanation of how
to determine the value of C
IN
.
3. R
f
Feedback resistance which sets the closed-loop gain in conjunction with R
IN
.
4. C
S
Supply bypass capacitor which provides power supply filtering. Refer to the section, Power Supply Bypassing, for
information concerning proper placement and selection of the supply bypass capacitor, C
BYPASS
.
5. C
BYPAS
Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of External
S
Components, for information concerning proper placement and selection of C
BYPASS
.
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