Datasheet

LM4923, LM4923LQBD
www.ti.com SNAS211E –JULY 2004–REVISED MAY 2013
Electrical Characteristics V
DD
= 3V
(1) (2)
The following specifications apply for V
DD
= 3V, A
V
= 1, and 8Ω load unless otherwise specified. Limits apply for T
A
= 25°C.
LM4923
Units
Symbol Parameter Conditions
(Limits)
Typical
(3)
Limit
(4)
I
DD
Quiescent Power Supply Current V
IN
= 0V, no load 3 5.5
mA (max)
V
IN
= 0V, R
L
= 8Ω 3 5.5
I
SD
Shutdown Current V
SHUTDOWN
= GND 0.1 1 µA (max)
P
o
Output Power THD = 1% (max); f = 1kHz
0.375 W
LM4923, R
L
= 8Ω
THD+N Total Harmonic Distortion+Noise P
o
= 0.25Wrms; f = 1kHz 0.02 %
PSRR Power Supply Rejection Ratio V
ripple
= 200mV sine p-p
f = 217Hz
(5)
85
f = 1kHz
(5)
85 73
CMRR Common-Mode Rejection Ratio f = 217Hz 50 dB
V
CM
= 200mV
pp
V
OS
Output Offset V
IN
= 0V 4 mV
V
SDIH
Shutdown Voltage Input High 0.8 V
V
SDIL
Shutdown Voltage Input Low 0.6 V
(1) All voltages are measured with respect to the ground 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 ensure specific performance limits. Electrical Characteristics state DC and AC electrical
specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the
Operating Ratings. Specifications are not ensured 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) Datasheet min/max specification limits are specified by design, test, or statistical analysis.
(5) 10Ω terminated input.
EXTERNAL COMPONENTS DESCRIPTION
(Figure 3)
Components Functional Description
1. R
i
Inverting input resistance which sets the closed-loop gain in conjunction with R
f
.
2. R
f
Feedback resistance which sets the closed-loop gain in conjunction with R
i
.
3. 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.
4. 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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