Electrical Characteristics VDD = 2.6V (Notes 1, 2, 8, 9)
The following specifications apply for VDD = 2.6V and 8Ω Load unless otherwise specified. Limits apply for TA
=
25˚C. (Continued)
LM4872
Units
Symbol
Parameter
Conditions
Typical
(Note 6)
0.01
Limit
(Note 7)
(Limits)
ISD
VOS
P0
Shutdown Current
VPIN1 = VDD
µA (max)
mV (max)
Output Offset Voltage
VIN = 0V
5
Output Power ( 8Ω )
Output Power ( 4Ω )
THD = 0.3% (max); f = 1 kHz
THD = 0.5% (max); f = 1 kHz
0.25
0.5
W
W
THD+N
PSRR
Total Harmonic Distortion+Noise
Po = 0.25 Wrms; AVD = 2; 20 Hz ≤
f ≤ 20 kHz
0.25
%
Power Supply Rejection Ratio
VDD = 2.5V to 2.7V
65
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 T
, θ , and the ambient temperature T . The maximum
JMAX JA
A
allowable power dissipation is P
= (T
–T )/θ or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4872, T
= 150˚C. The
JMAX
DMAX
JMAX
A
JA
typical junction-to-ambient thermal resistance is 150˚C/W.
Note 4: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 5: Machine Model, 220 pF–240 pF 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: Low Voltage Circuit - See Fig. 4
Note 9: Shutdown current is measured in a Normal Room Environment. Exposure to direct sunlight will increase I by a maximum of 2µA.
SD
External Components Description (Figure 1)
Components
Functional Description
1.
Ri
Inverting input resistance which sets the closed-loop gain in conjunction with Rf. This resistor also forms a
high pass filter with Ci at fC= 1/(2π RiCi).
2.
Ci
Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a
highpass filter with Ri at fc = 1/(2π RiCi). Refer to the section, Proper Selection of External Components,
for an explanation of how to determine the value of Ci.
3.
4.
Rf
Feedback resistance which sets the closed-loop gain in conjunction with Ri.
CS
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.
5.
CB
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 CB.
3
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