Electrical Characteristics for Bridged-Mode Operation (Notes 3, 4) (Continued)
The following specifications apply for V
DD
=
5V unless otherwise specified. Limits apply for T
A
=
25˚C.
Symbol Parameter Conditions LM4863 Units
(Limits)
Typical Limit
(Note
13)
(Note
14)
X
TALK
Channel Separation f
=
1 kHz, C
B
=
1.0 µF 90 dB
SNR Signal To Noise Ratio V
DD
=
5V, P
O
= 1.1W, R
L
=8Ω 98 dB
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 LM4863 Units
(Limits)
Typical Limit
(Note
13)
(Note
14)
V
OS
Output Offset Voltage V
IN
=
0V 5 50 mV (max)
P
O
Output Power THD
=
0.5
%
,f
=
1 kHz, R
L
=
32Ω 85 75 mW (min)
THD+N
=
1
%
,f
=
1 kHz, R
L
=
8Ω 340 mW
THD+N
=
10
%
,f
=
1 kHz, R
L
=
8Ω 440 mW
THD+N Total Harmonic Distortion+Noise A
V
=
−1, P
O
=
75 mW, 20 Hz ≤ f ≤ 20 kHz,
R
L
=
32Ω
0.2
%
PSRR Power Supply Rejection Ratio C
B
=
1.0 µF, V
RIPPLE
=
200 mV
RMS
,
f
=
1 kHz
52 dB
X
TALK
Channel Separation f
=
1 kHz, C
B
=
1.0 µF 60 dB
SNR Signal To Noise Ratio V
DD
=
5V, P
O
= 340mW, R
L
=8Ω 95 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 andAC 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 not soldered to any copper.
Note 7: When driving 3Ω loads from a 5V supply, the LM4863MTE must be mounted to the circuit board and forced-air cooled (450 linear-feet per minute).
Note 8: When driving 4Ω loads from a 5V supply, the LM4863MTE must be mounted to the circuit board.
Note 9: Output power is measured at the device terminals.
Note 10: 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 LM4863, 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 11: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 12: Machine model, 220 pF–240 pF discharged through all pins.
Note 13: Typicals are measured at 25˚C and represent the parametric norm.
Note 14: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 15: The quiescent power supply current depends on the offset voltage when a practical load is connected to the amplifier.
Truth Table for Logic Inputs
SHUTDOWN HP-IN LM4863 MODE
Low Low Bridged
Low High Single-Ended
High Low LM4863 Shutdown
High High LM4863 Shutdown
LM4863
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