Datasheet

LM4889
www.ti.com SNAS157H –APRIL 2002–REVISED MAY 2013
Electrical Characteristics V
DD
= 2.6V
(1)(2)
(continued)
The following specifications apply for V
DD
= 2.6V, A
V
= 2, and 8Ω load unless otherwise specified. Limits apply for T
A
= 25°C.
LM4889
Units
Symbol Parameter Conditions
(Limits)
Typical
(3)
Limit
(4)(5)
V
ripple
= 200mV sine p-p
PSRR Power Supply Rejection Ratio f
ripple
= 217Hz 44 dB
f
ripple
= 1kHz 44 dB
External Components Description
(Figure 1)
Components Functional Description
1. R
i
Inverting input resistance which sets the closed-loop gain in conjunction with R
f
. This resistor also forms a high pass
filter with C
i
at f
C
= 1/(2π R
i
C
i
).
2. C
i
Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a highpass filter with
R
i
at f
c
= 1/(2π R
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
Feedback resistance which sets the closed-loop gain in conjunction with R
i
. A
VD
= 2*(R
f
/R
i
).
4. C
S
Supply bypass capacitor which provides power supply filtering. Refer to the POWER SUPPLY BYPASSING section for
information concerning proper placement and selection of the supply bypass capacitor.
5. C
B
Bypass pin capacitor which provides half-supply filtering. Refer to the section, PROPER SELECTION OF EXTERNAL
COMPONENTS, for information concerning proper placement and selection of C
B
.
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