Datasheet

LM4995, LM4995TMBD
www.ti.com SNAS329G –APRIL 2006–REVISED APRIL 2013
ELECTRICAL CHARACTERISTICS V
DD
= 3.0V
(1)(2)
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for T
A
= 25°C.
LM4995
Units
Symbol Parameter Conditions
(Limits)
Typical
(3)
Limit
(4)(5)
V
IN
= 0V, I
o
= 0A, No Load 1.3 mA
I
DD
Quiescent Power Supply Current
V
IN
= 0V, I
o
= 0A, 8Ω Load 1.6 mA
I
SD
Shutdown Current V
SD
= V
GND
0.01 µA
V
OS
Output Offset Voltage No Load 5 mV
P
o
Output Power THD+N = 1% (max); f = 1 kHz 400 mW
T
WU
Wake-up time 110 ms
THD+N Total Harmonic Distortion + Noise P
o
= 250mW
RMS
; f = 1kHz 0.07 %
V
ripple
= 200mV sine p-p 74 (f = 217Hz)
PSRR Power Supply Rejection Ratio dB
Input terminated to GND 75 (f = 1kHz)
V
SDIH
Shutdown Voltage Input High 1.2 V
V
SDIL
Shutdown Voltage Input Low 1 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 ensure 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 specified to AOQL (Average Outgoing Quality Level).
(5) Datasheet min/max specification limits are specified 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/(2π R
i
C
i
).
2. C
i
Input coupling capacitor which 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 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.
5. 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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