LM4882 National Semiconductor, LM4882 Datasheet - Page 3

• Manufacturer Part Number: LM4882
• Description: 250mW Audio Power Amplifier with Shutdown Mode
• Manufacturer: National Semiconductor

THD + N
PSRR
Components
1. R
2. C
3. R
4. C
5. C
6. C
The following specifications apply for V
(Refer to Figure 1 )
Electrical Characteristics
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 T
allowable power dissipation is P
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
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
Typical Performance Characteristics
THD+N vs Frequency
Symbol
i
i
f
S
B
O
Total Harmonic Distortion + Noise
Power Supply Rejection Ratio
Functional Description
Inverting input resistance which sets the closed-loop gain in conjunction with R
high pass filter with C
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a
highpass filter with R
for an explanation of how to determine the values of C
Feedback resistance which sets closed-loop gain in conjunction with R
Supply bypass capacitor which provides power supply filtering. Refer to the Application Information section
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
Output coupling capacitor which blocks the DC voltage at the amplifier’s output. Forms a high pass filter wth
R
for proper placement and selection of the supply bypass capacitor.
L
at f
O
DMAX
= 1 / (2 R
Parameter
= (T
DS100030-26
JMAX
L
C
DD
− T
i
i
at f
O
at f
A
).
= 3V unless otherwise specified. Limits apply for T
)/
(Notes 1, 2) (Continued)
c
c
JA
THD+N vs Frequency
= 1 / (2 R
. For the LM4882, T
= 1 / (2 R
resistor.
R
R
f = 1 kHz
V
f = 120 Hz
pin3
L
L
i
C
i
= 8 , P
= 32 , P
C
i
i
).
). Refer to the section, Proper Selection of External Components,
= 2.5V, V
JMAX
3
O
Conditions
O
= 150˚C, and the typical junction-to-ambient thermal resistance, when board
= 70 mWrms;
= 30 mWrms;
ripple
i
.
= 200 mVrms,
DS100030-9
JMAX
,
JA
THD+N vs Frequency
, and the ambient temperature T
i
.
(Note 5)
Typical
A
0.25
= 25˚C.
0.3
50
B
f
. This resistor also forms a
.
LM4882
(Note 6)
Limit
A
. The maximum
www.national.com
(Limits)
Units
DS100030-10
dB
%
%