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LM4820IBPX-6 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM4820IBPX-6
Description  Fixed Gain 1 Watt Audio Power Amplifier
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4820IBPX-6 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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Electrical Characteristics V
DD = 2.6V (Notes 1, 2, 8)
The following specifications apply for V
DD = 2.6V and 8Ω Load unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4820-6
Units
Typical
Limit
(Note 6)
(Note 7)
I
DD
Quiescent Power Supply Current
V
IN = 0V, Io = 0A
2.6
mA (max)
I
SD
Shutdown Current
V
shutdown = GND
0.1
µA (max)
P
0
Output Power ( 8
Ω )
Output Power ( 4
Ω )
THD = 1% (max);f=1kHz THD
= 1% (max);f=1kHz
0.2
0.4
W
W
THD+N
Total Harmonic Distortion+Noise
P
o = 0.1Wrms; f = 1kHz
0.08
%
PSRR
Power Supply Rejection Ratio
V
ripple = 200mV sine p-p
44 (f =
217Hz)
44 (f =
1kHz)
dB
A
V
Fixed Voltage Gain
.5V
in rms, RL =8Ω
6.0
dB
Note 1: All voltages are measured with respect to the ground 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, θJA, and the ambient temperature TA. The maximum
allowable power dissipation is PDMAX =(TJMAX–TA)/θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4820-6, see power
derating curves for additional information.
Note 4: Human body model, 100 pF discharged through a 1.5 k
Ω resistor.
Note 5: Machine Model, 220 pF–240 pF 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: For micro SMD only, shutdown current is measured in a Normal Room Environment. Exposure to direct sunlight will increase ISD by a maximum of 2µA.
External Components Description (Figure 1)
Components
Functional Description
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 fc = 1/(2π RiCi). Refer to the section, Proper Selection of External Components,
for an explanation of how to determine the value of C
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.
Typical Performance Characteristics
THD+N vs Frequency
at V
DD =5V, 8Ω RL, and PWR = 250mW
DS200106-37
THD+N vs Frequency
at V
DD = 3.3V, 8Ω RL, and PWR = 150mW
DS200106-38
www.national.com
4


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