Datasheet
LM4670
www.ti.com
SNAS240C –DECEMBER 2004–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.
LM4670
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 1.65 W
V
DD
= 3.6V 850 mW
V
DD
= 2.5V 400 mW
P
O
Output Power
(7)
R
L
= 15μH + 8Ω + 15μH,
THD+N = 1% (max)
f = 1kHz, 22kHz BW
V
DD
= 5V, 1.35 W
V
DD
= 3.6V, 680 mW (min)
V
DD
= 2.5V, 325 600 mW
V
DD
= 5V, P
O
= 1W
RMS
,
0.35 %
f = 1kHz
V
DD
= 3.6V, P
O
= 0.5W
RMS
,
0.30 %
f = 1kHz
THD+N Total Harmonic Distortion + Noise
V
DD
= 3.6V, P
O
= 0.5W
RMS
,
0.30 %
f = 5kHz
V
DD
= 3.6V, P
O
= 0.5W
RMS
,
0.30 %
f = 10kHz
V
DD
= 3.6V,
V
Ripple
= 200mV
PP
Sine,
f
Ripple
= 217Hz 68 dB
Inputs to AC GND, C
I
= 0.1μ,
Input Referred
V
DD
= 3.6V,
V
Ripple
= 200mV
PP
Sine,
PSRR Power Supply Rejection Ratio f
Ripple
= 1kHz 65 dB
Inputs to AC GND, C
I
= 0.1μF
Input Referred
V
DD
= 3.6V,
V
Ripple
= 200mV
PP
Sine,
f
Ripple
= 217Hz 62 dB
f
IN
= 1kHz, P
O
= 10mW
RMS
Input Referred
SNR Signal to Noise Ratio V
DD
= 5V, P
O
= 1W
RMS
93 dB
V
DD
= 3.6V, f = 20Hz – 20kHz
Inputs to AC GND, C
I
= 0.1μF 85 μV
RMS
No Weighting, Input Referred
ε
OUT
Output Noise
V
DD
= 3.6V, Inputs to AC GND
C
I
= 0.1μF, A Weighted 65 μV
RMS
Input Referred
V
DD
= 3.6V, V
Ripple
= 1V
PP
Sine
CMRR Common Mode Rejection Ratio 80 dB
f
Ripple
= 217Hz, Input Referred
T
WU
Wake-up Time V
DD
= 3.6V 1.35 ms
T
SD
Shutdown Time V
DD
= 3.6V 0.01 ms
External Components Description
See Figure 1
Components Functional Description
1. C
S
Supply bypass capacitor which provides power supply filtering. Refer to POWER SUPPLY BYPASSING for
information concerning proper placement and selection of the supply bypass capacitor.
2. R
I
Gain setting resistor. Differential gain is set by the equation A
V
= 2 * 150kΩ / R
i
(V/V).
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