lm4840 National Semiconductor Corporation, lm4840 Datasheet - Page 4

• Manufacturer Part Number: lm4840
• Description: Stereo 2w Audio Power Amplifiers With Digital Volume Control And Input Mux
• Manufacturer: National Semiconductor Corporation

www.national.com
THD+N
PSRR
SNR
X
V
P
THD+N
PSRR
SNR
X
(Notes 7, 10)
The following specifications apply for V
talk
(Notes 7, 10)
The following specifications apply for V
OS
O
talk
Symbol
Symbol
Electrical Characteristics for Single-Ended Mode Operation
Electrical Characteristics for Bridged Mode Operation
Note 3: The
Note 4: The
through 21 8mil vias.
Note 5: The
Note 6: The
Note 7: All voltages are measured with respect to the ground pins, unless otherwise specified. All specifications are tested using the typical application as shown
in Figure 1 .
Note 8: When driving 3
Note 9: When driving 4
Note 10: 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 Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Marshall Chiu feels there are better ways to obtain ’More
Wattage in the Cottage.’ Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device
performance.
Note 11: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
allowable power dissipation is P
resistance, when board mounted, is 80˚C/W for the MTC28 package and 42˚C/W for the LM4840LQ package.
Note 12: Human body model, 100 pF discharged through a 1.5 k
Note 13: Machine Model, 220 pF–240 pF discharged through all pins.
Note 14: Typicals are specified at 25˚C and represent the parametric norm.
Note 15: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 16: Number given is for an LQA028A package whose exposed-DAP is soldered to an exposed 2.5in
JA
JA
JA
JA
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
Signal to Noise Ratio
Channel Separation
Output Offset Voltage
Output Power
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
Signal to Noise Ratio
Channel Separation
given is for an MXA28A package whose exposed-DAP is soldered to an exposed 2in
given is for an MXA28A package whose exposed-DAP is soldered to a 2in
given is for an MXA28A package whose exposed-DAP is soldered to an exposed 1in
given is for an MXA28A package whose exposed-DAP is not soldered to any copper.
loads from a 5V supply the LM4840LQ and LM4840MH must be mounted to the circuit board and forced-air cooled.
loads from a 5V supply the LM4840LQ and LM4840MH must be mounted to the circuit board.
Parameter
Parameter
DMAX
= (T
JMAX
DD
DD
− T
= 5V. Limits apply for T
= 5V, unless otherwise noted. Limits apply for T
A
)/
JA
. For the LM4840LQ and LM4840MT, T
V
A
C
V
P
Filter
f=1kHz, C
V
THD + N = 1.0%; f=1kHz; R
(Note 8)
THD + N = 1.0%; f=1kHz; R
(Note 9)
THD = 1.5% (max);f = 1 kHz;
R
THD+N = 10%;f = 1 kHz; R
P
R
P
C
V
V
A-Wtd Filter
f=1kHz, C
OUT
VD
RIPPLE
OUT
IN
O
O
RIPPLE
DD
B
L
L
B
= 8
= 8 , A
= 1.0 µF, f =120 Hz,
= 1.0 µF, f = 120 Hz,
= 1W, 20 Hz
= 340 mW, R
resistor.
= 0V, No Load
= 1
= 5V, P
= 1V
=75 mW, R
= 200 mVrms
= 200 mVrms; R
B
B
RMS
VD
= 1.0 µF
= 1.0 µF
Conditions
Conditions
OUT
4
= 2
, f=1kHz, R
A
<
= 25˚C.
= 1.1W, R
L
L
f
= 32
= 32 , A-Wtd
<
2
20 kHz,
piece of 1 ounce printed circuit board copper on a bottom side layer
L
L
= 8
L
= 10k ,
L
L
L
= 8 ,
= 8
JMAX
= 3
= 4
2
2
JMAX
piece of 1 ounce printed circuit board copper.
piece of 1 ounce printed circuit board copper.
2
= 150˚C, and the typical junction-to-ambient thermal
,
piece of 1 ounce PCB copper.
JA
, and the ambient temperature T
A
(Note 14)
(Note 14)
Typical
Typical
= 25˚C.
0.065
102
2.2
1.1
1.5
0.3
1.0
58
65
74
93
70
5
2
LM4840
LM4840
(Continued)
(Note 15)
(Note 15)
Limit
Limit
1.0
50
A
. The maximum
mV (max)
(Limits)
(Limits)
W (min)
Units
Units
dB
dB
dB
dB
dB
dB
%
W
W
W
%
%