LM4910
SNAS151G – MAY 2004 – REVISED MARCH 2007
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Electrical Characteristics V
DD
= 2.6V
(1) (2)
The following specifications apply for V
DD
= 2.6V, A
V
= 1, and 32
Ω
load unless otherwise specified. Limits apply to T
A
= 25°C.
Symbol
Parameter
Conditions
LM4910
Units
(Limits)
Typ
Limit
(3)
(4) (5)
I
DD
Quiescent Power Supply Current
V
IN
= 0V, 32
Ω
Load
3.0
mA (max)
I
SD
Standby Current
V
SHUTDOWN
= GND
0.1
µA (max)
V
OS
Output Offset Voltage
5
mV (max)
P
O
Output Power
THD = 1% (max); f = 1kHz
13
mW
THD+N
Total Harmonic Dist Noise
P
O
= 10mW
rms
; f = 1kHz
0.3
%
55 (f =
V
RIPPLE
= 200mV
p-p
sinewave
217Hz)
PSRR
Power Supply Rejection Ratio
dB
Input terminated with 10
Ω
to ground
55 (f =
1kHz)
(1)
All voltages are measured with respect to the GND pin unless otherwise specified.
(2)
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical
specifications under particular test conditions which guarantee specific performance limits. This assumes that the device is within the
Operating Ratings. Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good
indication of device performance.
(3)
Typicals are measured at 25°C and represent the parametric norm.
(4)
Limits are guaranteed to National's AOQL (Average Outgoing Quality Level).
(5)
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
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/(2
π
R
i
C
i
).
2.
C
I
Input coupling capacitor which blocks the DC voltage at the amplifier's input terminals. Also creates a high-pass filter
with R
i
at f
c
= 1/(2
π
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
.
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.
6
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