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LM4882 Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4882
Description  250mW Audio Power Amplifier with Shutdown Mode
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4882 Datasheet(HTML) 3 Page - National Semiconductor (TI)

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Electrical Characteristics (Notes 1, 2) (Continued)
The following specifications apply for V
DD = 3V unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4882
Units
(Limits)
Typical
(Note 5)
Limit
(Note 6)
THD + N
Total Harmonic Distortion + Noise
R
L =8Ω,P O = 70 mWrms;
0.25
%
R
L =32Ω,PO = 30 mWrms;
0.3
%
f=1kHz
PSRR
Power Supply Rejection Ratio
V
pin3 = 2.5V, V ripple = 200 mVrms,
f = 120 Hz
50
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 func-
tional, but do not guarantee specific performance limits.
Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guar-
antee 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 P DMAX =(TJMAX −TA)/θJA. For the LM4882, TJMAX = 150˚C, and the typical junction-to-ambient thermal resistance, when board
mounted, is 210˚C/W for the MUA08A Package and 170˚C/W for the M08A Package.
Note 4: Human body model, 100 pF discharged through a 1.5 k
Ω resistor.
Note 5: Typicals are measured at 25˚C and represent the parametric norm.
Note 6: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
External Components Description
(Refer to
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 fc =1/(2πRiCi).
2. C
i
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a
highpass filter with R
i at fc =1/(2πRiC i). Refer to the section, Proper Selection of External Components,
for an explanation of how to determine the values of C
i.
3. R
f
Feedback resistance which sets closed-loop gain in conjunction with R
i.
4. C
S
Supply bypass capacitor which provides power supply filtering. Refer to the Application Information section
for 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.
6. C
O
Output coupling capacitor which blocks the DC voltage at the amplifier’s output. Forms a high pass filter wth
R
L at fO =1/(2πRLC O).
Typical Performance Characteristics
THD+N vs Frequency
DS100030-26
THD+N vs Frequency
DS100030-9
THD+N vs Frequency
DS100030-10
3
www.national.com


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