Datasheet

LM4871
SNAS002F –FEBRUARY 2000–REVISED MAY 2013 www.ti.com
Electrical Characteristics
(1)(2)
(continued)
The following specifications apply for V
DD
= 5V and R
L
= 8Ω unless otherwise specified. Limits apply for T
A
= 25°C.
LM4871
Symbol Parameter Conditions
Units
Min
(3)
Typical
(4)
Limit
(3)
(Limits)
P
o
Output Power THD = 1%, f = 1kHz
LM4871LD, R
L
= 3Ω
(5)
2.38
W
LM4871LD, R
L
= 4Ω
(5)
2
LM4871, R
L
= 8Ω
(5)
1.2
THD+N = 10%, f = 1kHz
LM4871LD, R
L
= 3Ω
(5)
3
W
LM4871LD, R
L
= 4Ω
(5)
2.5
LM4871, R
L
= 8Ω
(5)
1.5
THD+N Total Harmonic 20Hz ≤ f ≤ 20kHz, A
VD
= 2
Distortion+Noise LM4871LD, R
L
= 4Ω, P
O
= 1.6W 0.13 %
LM4871, R
L
= 8Ω, P
O
= 1W 0.25
PSRR Power Supply Rejection Ratio V
DD
= 4.9V to 5.1V 60 dB
(5) When driving 3Ω or 4Ω loads from a 5V supply, the LM4871LD must be mounted to a circuit board.
External Components Description
(Figure 3)
Components Functional Description
1. R
i
Inverting input resistance that 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 that 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 that sets the closed-loop gain in conjunction with R
i
.
4. C
S
Supply bypass capacitor that 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 that 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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