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LM4927SD Arkusz danych(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części LM4927SD
Szczegółowy opis  2.5 Watt Fully Differential Audio Power Amplifier With Shutdown
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4927SD Arkusz danych(HTML) 4 Page - National Semiconductor (TI)

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Electrical Characteristics V
DD =3V (Notes 1, 2)
The following specifications apply for V
DD = 3V, AV = 1, and 8
Ω load unless otherwise specified. Limits apply for T
A =
25˚C. (Continued)
Symbol
Parameter
Conditions
LM4927
Units
(Limits)
Typical
Limit
(Note 6)
(Note 7)
P
o
Output Power
THD = 1% (max);f=1kHz
R
L =4
R
L =8
0.650
0.450
W
THD = 10% (max);f=1kHz
R
L =4
R
L =8
0.800
0.550
W
THD+N
Total Harmonic Distortion+Noise
P
o = 0.25Wrms; f = 1kHz
0.04
%
PSRR
Power Supply Rejection Ratio
V
ripple = 200mV sine p-p
f = 217Hz (Note 8)
85
dB
f = 1kHz (Note 8)
80
CMRR
Common-Mode Rejection Ratio
f = 217Hz, V
CM = 200mVpp
60
dB
V
OS
Output Offset
V
IN = 0V
4
mV (max)
V
SDIH
Shutdown Voltage Input High
1.4
V (min)
V
SDIL
Shutdown Voltage Input Low
0.4
V (max)
T
WU
Wake-up time from Shutdown
Cbypass
8
ms
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 LM4927, see power
derating curve for additional information.
Note 4: Human body model, 100pF discharged through a 1.5k
Ω 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: 10
Ω terminated input.
Note 9: When driving 4
Ω loads from a 5V power supply, the LM4927LD must be mounted to a circuit board with the exposed-DAP area soldered down to a 1in2
plane of 1oz, copper.
Note 10: Data taken with BW = 80kHz and AV = 1/1 except where specified.
External Components Description
(Figure 1)
Components
Functional Description
1.
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.
2.
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.
3.
R
i
Inverting input resistance which sets the closed-loop gain in conjunction with R
f.
4.
R
f
Internal feedback resistance which sets the closed-loop gain in conjunction with R
i.
www.national.com
4


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