If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Storage Temperature
Input Voltage
Power Dissipation (Note 3)
ESD Susceptibility (Note 4)
ESD Susceptibility (Note 5)
6.0V
−65°C to +150°C
-0.3V to V
DD
+ 0.3V
Internally Limited
2000V
250V
Junction Temperature
Thermal Resistance
θ
JC
(MSOP)
θ
JA
(MSOP)
150°C
56°C/W
190°C/W
Operating Ratings
Temperature Range
T
MIN
≤
T
A
≤
T
MAX
Supply Voltage (V
DD
)
(Notes 1, 2)
−40°C
≤
T
A
≤
85°C
2.0V
≤
V
DD
≤
5.5V
Electrical Characteristics V
DD
= 5.0V
Symbol
Parameter
The following specifications apply for V
DD
= 5.0V, R
L
= 16Ω,
C
O
= 100µ, and C
B
= 4.7µF unless otherwise specified. Limits apply
to T
A
= 25°C.
Conditions
LM4912
Typ
(Note 6)
I
DD
I
SD
I
M
V
SDIH
V
SDIL
V
MIH
V
MIL
P
O
V
NO
PSRR
A
M
Quiescent Power Supply Current
Shutdown Current
Mute Current
Shutdown Voltage Input High
Shutdown Voltage Input Low
Mute Voltage Input High
Mute Voltage Input Low
THD = 1%; f = 1kHz
Output Power
Output Noise Voltage
Power Supply Rejection Ratio
Mute Attenuation
R = 16Ω
R = 32Ω
BW = 20 Hz to 20kHz, A-weighted
V
RIPPLE
= 200mV sine p-p
f = 1kHz
(Notes 1, 2)
145
80
10
65
85
µV
dB
dB
mW
V
IN
= 0V, I
O
= 0A
V
SHUTDOWN
= GND
V
MUTE
= V
DD
2
0.1
2
1.8
0.4
1.8
0.4
Limit
(Note 7)
5
2.0
5
Units
(Limits)
mA (max)
µA (max)
mA (max)
V
V
V
V
The following specifications apply for V
DD
= 3.0V, R
L
= 16Ω,
C
O
= 100µF, and C
B
= 4.7µF unless otherwise specified. Limits apply
to T
A
= 25°C.
Symbol
Parameter
Conditions
LM4912
Typ
(Note 6)
I
DD
I
SD
I
M
P
O
V
NO
PSRR
A
M
Quiescent Power Supply Current
Shutdown Current
Mute Current
Output Power
Output Noise Voltage
Power Supply Rejection Ratio
Mute Attenuation
V
IN
= 0V, I
O
= 0A
V
SHUTDOWN
= GND
V
MUTE
= V
DD
THD = 1%; f = 1kHz
R = 16Ω
R = 32Ω
BW = 20 Hz to 20kHz, A-weighted
V
RIPPLE
= 200mV sine p-p
f = 1kHz
40
25
10
65
80
µV
dB
dB
mW
1.5
0.1
1.5
Limit
(Note 7)
3
2.0
3
Units
(Limits)
mA (max)
µA (max)
mA (max)
Electrical Characteristics V
DD
= 3.0V
3
www.national.com
LM4912
The following specifications apply for V
DD
= 2.4V, R
L
= 16Ω,
C
O
= 100µF, and C
B
= 4.7µF unless otherwise specified. Limits apply
to T
A
= 25°C.
Symbol
Parameter
Conditions
LM4912
Typ
(Note 6)
I
DD
I
SD
I
M
P
O
V
NO
PSRR
T
WU
V
OSD
T
UM
A
M
Quiescent Power Supply Current
Shutdown Current
Mute Current
Output Power
Output Noise Voltage
Power Supply Rejection Ratio
Wake Up Time from Shutdown
Output Voltage Change on
Release from Shutdown
Time to Un-Mute
Mute Attenuation
f = 1kHz
0.01
80
V
IN
= 0V, I
O
= 0A
V
SHUTDOWN
= GND
V
MUTE
= V
DD
THD = 1%; f = 1kHz
R = 16Ω
R = 32Ω
BW = 20 Hz to 20kHz, A-weighted
V
RIPPLE
= 200mV sine p-p
25
12
10
65
2
1
0.02
µV
dB
s
mV (max)
s (max)
db
mW
1.5
0.1
1.5
Limit
(Note 7)
3
2.0
3
Units
(Limits)
mA (max)
µA (max)
mA (max)
Electrical Characteristics V
DD
= 2.4V
(Notes 1, 2)
Note 1:
All voltages are measured with respect to the GND pin unless otherwise specified.
Note 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.
Note 3:
: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX,
θ
JA
, and the ambient temperature, T
A
. The
maximum allowable power dissipation is P
DMAX
= (T
JMAX
- T
A
)/ θ
JA
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4912, see
power derating currents for more information.
Note 4:
Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 5:
Machine Model, 220pF-240pF discharged through all pins.
Note 6:
Typicals are measured at 25°C and represent the parametric norm.
Note 7:
Limits are guaranteed to National's AOQL (Average Outgoing Quality Level).
Note 8:
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9:
10Ω
Terminated input.
External Components Description
See (Figure
1)
Components
1.
2.
R
I
C
I
pass filter with C
i
at f
c
= 1/(2
π
R
i
C
i
).
Functional Description
Inverting input resistance which sets the closed-loop gain in conjunction with R
f
. This resistor also forms a high-
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
.
Feedback resistance which sets the closed-loop gain in conjunction with R
i
.
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.
Bypass pin capacitor which provides half-supply filtering. Refer to the section,
Proper Selection of Proper
Components,
for information concerning proper placement and selection of C
B
Output coupling capacitor which blocks the DC voltage at the amplifier's output. Forms a high pass filter with R
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