LM4873
Electrical Characteristics for Bridged-Mode Operation
(Notes 3, 4)
The following specifications apply for V
DD
= 5V unless otherwise specified. Limits apply for T
A
= 25˚C.
Symbol
Parameter
Conditions
(Continued)
LM4873
Typical
(Note
17)
Limit
(Note
18)
Units
(Limits)
THD+N
Total Harmonic Distortion+Noise
20 Hz
≤
f
≤
20 kHz, A
VD
= 2
LM4873MTE-1, R
L
= 4Ω, P
O
= 2W
LM4873, R
L
= 8Ω, P
O
= 1W
V
DD
= 5V, V
RIPPLE
= 200 mV
RMS
, R
L
= 8Ω,
C
B
= 1.0 µF
f = 1 kHz, C
B
= 1.0 µF
V
DD
= 5V, P
O
= 1.1W, R
L
= 8Ω
0.3
0.3
67
80
97
%
dB
dB
dB
PSRR
X
TALK
SNR
Power Supply Rejection Ratio
Channel Separation
Signal To Noise Ratio
Electrical Characteristics for Single-Ended Operation
(Notes 3, 4)
The following specifications apply for V
DD
= 5V unless otherwise specified. Limits apply for T
A
= 25˚C.
Symbol
Parameter
Conditions
LM4873
Typical
(Note
17)
V
OS
P
O
Output Offset Voltage
Output Power
V
IN
= 0V
THD = 0.5%, f = 1 kHz, R
L
= 32Ω
THD+N = 1%, f = 1 kHz, R
L
= 8Ω
THD+N = 10%, f = 1 kHz, R
L
= 8Ω
THD+N
PSRR
X
TALK
SNR
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
Channel Separation
Signal To Noise Ratio
A
V
= −1, P
O
= 75 mW, 20 Hz
≤
f
≤
20 kHz,
R
L
= 32Ω
C
B
= 1.0 µF, V
RIPPLE
= 200 mV
f = 1 kHz
f = 1 kHz, C
B
= 1.0 µF
V
DD
= 5V, P
O
= 340mW, R
L
= 8Ω
RMS
,
Limit
(Note
18)
50
75
Units
(Limits)
5
85
340
440
0.2
52
60
94
mV (max)
mW (min)
mW
mW
%
dB
dB
dB
Note 3:
All voltages are measured with respect to the ground pins, 2, 7, and 15, unless otherwise specified.
Note 4:
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 5:
The
θ
JA
given is for an MXA20A package whose exposed-DAP is soldered to an exposed 2in
2
piece of 1 ounce printed circuit board copper.
Note 6:
The
θ
JA
given is for an MXA20A package whose exposed-DAP is soldered to an exposed 1in
2
piece of 1 ounce printed circuit board copper.
Note 7:
The
θ
JA
given is for an MXA20A package whose exposed-DAP is not soldered to any copper.
Note 8:
The
θ
JA
given is for an MXA28A package whose exposed-DAP is soldered to an exposed 2in
2
piece of 1 ounce printed circuit board copper.
Note 9:
The
θ
JA
given is for an MXA28A package whose exposed-DAP is soldered to an exposed 1in
2
piece of 1 ounce printed circuit board copper.
Note 10:
The
θ
JA
given is for an MXA28A package whose exposed-DAP is not soldered to any copper.
Note 11:
When driving 3Ω loads from a 5V supply, the LM4873MTE or LM4873MTE-1 must be mounted to the circuit board and forced-air cooled (450 linear-feet
per minute).
Note 12:
When driving 4Ω loads from a 5V supply, the LM4873MTE or LM4873MTE-1 must be mounted to the circuit board.
Note 13:
Output power is measured at the device terminals.
Note 14:
The maximum power dissipation must be derated at elevated temperatures and is dictated by T
JMAX
,
θ
JA
, and the ambient temperature T
A
. The maximum
allowable power dissipation is P
DMAX
= (T
JMAX
− T
A
)/θ
JA
. For the LM4873, T
JMAX
= 150˚C. For the
θ
JA
s for different packages, please see the Application Informa-
tion section or the Absolute Maximum Ratings section.
Note 15:
Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 16:
Machine model, 220 pF–240 pF discharged through all pins.
Note 17:
Typicals are measured at 25˚C and represent the parametric norm.
Note 18:
Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 19:
The quiescent power supply current depends on the offset voltage when a practical load is connected to the amplifier.
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