Datasheet

LM4673, LM4673SDBD, LM4673TMBD
www.ti.com SNAS317D –DECEMBER 2005–REVISED MAY 2013
Electrical Characteristics
(1)(2)
(continued)
The following specifications apply for A
V
= 2V/V (R
I
= 150kΩ), R
L
= 15µH + 8Ω + 15µH unless otherwise specified. Limits
apply for T
A
= 25°C.
LM4673
Units
Symbol Parameter Conditions
(Limits)
Typical
(3)
Limit
(4)(5)
R
L
= 15μH + 8Ω + 15μH
THD = 10% (max)
f = 1kHz, 22kHz BW
V
DD
= 5V 1.7 W
V
DD
= 3.6V 870 mW
V
DD
= 2.5V 350 mW
P
O
Output Power
R
L
= 15μH + 8Ω + 15μH
THD = 1% (max)
f = 1kHz, 22kHz BW
V
DD
= 5V 1.24 W
V
DD
= 3.6V 650 600 mW
V
DD
= 2.5V 300 mW
V
DD
= 5V, P
O
= 0.1W, f = 1kHz 0.03 %
THD+N Total Harmonic Distortion + Noise V
DD
= 3.6V, P
O
= 0.1W, f = 1kHz 0.02 %
V
DD
= 2.5V, P
O
= 0.1W, f = 1kHz 0.02 %
V
Ripple
= 200mV
PP
Sine,
f
Ripple
= 217Hz, V
DD
= 3.6, 5V 78 dB
Inputs to AC GND, C
I
= 2μF
Power Supply Rejection Ratio
PSRR
(Input Referred)
V
Ripple
= 200mV
PP
Sine,
f
Ripple
= 1kHz, V
DD
= 3.6, 5V 72 dB
Inputs to AC GND, C
I
= 2μF
SNR Signal to Noise Ratio V
DD
= 5V, P
O
= 1W
RMS
97 dB
V
DD
= 3.6V, f = 20Hz – 20kHz
Inputs to AC GND, C
I
= 2μF 30 μV
RMS
Output Noise
No Weighting
ε
OUT
(Input Referred)
V
DD
= 3.6V, Inputs to AC GND
23 μV
RMS
C
I
= 2μF, A Weighted
Common Mode Rejection Ratio V
DD
= 3.6V, V
Ripple
= 1V
PP
Sine
CMRR 70 dB
(Input Referred) f
Ripple
= 217Hz
T
WU
Wake-up Time V
DD
= 3.6V 17 μs
T
SD
Shutdown Time 140 μs
V
DD
= 3.6V, P
OUT
= 400mW
88 %
R
L
= 8Ω
η Efficiency
V
DD
= 5V, P
OUT
= 1W
86 %
R
L
= 8Ω
External Components Description
(Figure 1)
Components Functional Description
1. 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.
2. C
I
Input AC coupling capacitor which blocks the DC voltage at the amplifier's input terminals.
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