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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 = 25C.
Symbol
Parameter
Conditions
LM4882
Units
(Limits)
Typical
(Note 5)
Limit
(Note 6)
THD + N
Total Harmonic Distortion + Noise
R
L =8
,P
O = 70 mWrms;
0.25
%
R
L =32
,P
O = 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
functional, but do not guarantee specific performance limits. Electrical Characteristicsstate 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 P DMAX =(TJMAX TA)/θJA. For the LM4882, TJMAX = 150C, and the typical junction-to-ambient thermal resistance, when board
mounted, is 210C/W for the MUA08A Package and 170C/W for the M08A Package.
Note 4: Human body model, 100 pF discharged through a 1.5 k
resistor.
Note 5: Typicals are measured at 25C 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/(2
πR
iCi).
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/(2
πR
iC 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 f
O =1/(2
πR
LC O).
Typical Performance Characteristics
THD+N vs Frequency
10003026
10003009
LM4882
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