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LM4928 Datasheet(Fiches technique) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Numéro de pièce LM4928
Description  1.2 Watt Stereo Fully Differential Audio Amplifier with RF Suppression and Shutdown Low
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
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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
LM4928
Units
(Limits)
Typical
Limit
(Note 6)
(Note 7)
P
o
Output Power
THD = 1% (max);f=1kHz
R
L =4
R
L =8
0.55
0.40
W
THD = 10% (max);f=1kHz
R
L =4
R
L =8
0.68
0.50
W
THD+N
Total Harmonic Distortion + Noise
P
o = 0.25Wrms; f = 1kHz
0.05
%
PSRR
Power Supply Rejection Ratio
V
ripple = 200mV sine p-p
f = 217Hz (Note 8)
90
dB
f = 1kHz (Note 8)
90
CMRR
Common-Mode Rejection Ratio
f = 217Hz, V
CM = 200mVpp
70
50
dB (min)
V
OS
Output Offset
V
IN = 0V
4
18
mV (max)
V
SDIH
Shutdown Voltage Input High
1.4
V
V
SDIL
Shutdown Voltage Input Low
0.4
V
SNR
Signal-to-Noise Ratio
P
O = 0.4W, f = 1kHz
105
dB
T
WU
Wake-up time from Shutdown
Cbypass = 1µF
9
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 LM4928, 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: Inputs are AC terminated to GND.
Note 9: When driving 4
Ω loads from a 5V power supply, the LM4928SD must be mounted to a circuit board with the exposed-DAP area soldered down to at least
4in2 plane of 1oz, copper.
Note 10: Data taken with BW = 80kHz and AV = 1 except where specified.
Note 11: Maximum Power Dissipation (PDMAX) in the device occurs at an output power level significantly below full output power. PDMAX can be calculated using
Equation 4 shown in the Application section. It may also be obtained from the Power Dissipation graphs.
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 Power Supply Bypassing section 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
External feedback resistance which sets the closed-loop gain in conjunction with R
i.
www.national.com
5




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