LM4877 National Semiconductor, LM4877 Datasheet - Page 3

• Manufacturer Part Number: LM4877
• Description: 1 Watt Audio Power Amplifier in micro SMD package with Shutdown Logic Low
• Manufacturer: National Semiconductor

I
V
P
THD+N
PSRR
V
V
Symbol
Symbol
SD
OS
0
IH
IL
Electrical Characteristics V
The following specifications apply for V
25˚C. (Continued)
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
typical junction-to-ambient thermal resistance is 150˚C/W.
Note 4: Human body model, 100 pF discharged through a 1.5 k
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
Electrical Characteristics V
External Components Description
Components
1.
2.
3.
4.
5.
Shutdown Current
Output Offset Voltage
Output Power ( 8
Output Power ( 4
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
Shutdown Input Voltage High
Shutdown Input Voltage Low
C
C
R
C
R
S
B
i
i
f
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 amplifiers input terminals. Also creates a
highpass filter with R
for an explanation of how to determine the value of C
Feedback resistance which sets the closed-loop gain in conjunction with R
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.
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
Parameter
Parameter
DMAX
= (T
)
)
JMAX
–T
A
DD
)/
i
i
JA
at f
at f
= 2.6V and 8
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4877, T
c
DD
C
DD
= 1/(2 R
= 1/(2 R
V
V
THD = 0.3% (max); f = 1 kHz
THD = 0.5% (max); f = 1 kHz
P
f
V
PIN5
IN
o
DD
= 2.6V
= 0.25 Wrms; A
20 kHz
= 5/3.3/2.6V Shutdown Input
= 0V
= 2.5V to 2.7V
resistor.
= 0V
i
i
C
C
i
Load unless otherwise specified. Limits apply for T
( Figure 1 )
i
). Refer to the section, Proper Selection of External Components,
).
Conditions
Conditions
(Notes 1, 2, 8, 9)
Functional Description
3
VD
= 2; 20 Hz
i
.
JMAX
,
JA
(Note 6)
Typical
Typical
, and the ambient temperature T
0.01
0.25
0.25
0.5
SD
65
5
by a maximum of 2µA.
i
.
LM4877
LM4877
B
f
. This resistor also forms a
.
(Note 7)
Limit
Limit
1.2
0.4
A
=
JMAX
A
. The maximum
www.national.com
= 150˚C. The
mV (max)
µA (max)
(Limits)
(Limits)
V(max)
V(min)
Units
Units
dB
W
W
%