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LM3875 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM3875
Description  OverturTM Audio Power Amplifier Series High-Performance 56W Audio Power Amplifier
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3875 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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Electrical Characteristics (Notes 1, 2) (Continued)
The following specifications apply for V
+ = +35V, V= −35V with R
L =8
Ω unless otherwise specified. Limits apply for T
A =
25˚C.
Symbol
Parameter
Conditions
LM3875
Units
(Limits)
Typical
(Note 6)
Limit
(Note 7)
SNR
Signal-to-Noise Ratio
P
O = 1W, A-Weighted,
Measured at 1 kHz, R
S =25
98 dB
dB
P
O = 40W, A-Weighted,
Measured at 1 kHz, R
S =25
114 dB
dB
P
pk = 100W, A-Weighted,
Measured at 1 kHz, R
S =25
122 dB
dB
IMD
Intermodulation Distortion Test
60 Hz, 7 kHz, 4:1 (SMPTE)
60 Hz, 7 kHz, 1:1 (SMPTE)
0.004
0.006
%
*DC Electrical Test; refer to Test Circuit #1.
**AC Electrical Test; refer to Test Circuit #2.
Note 1: 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. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 2: All voltages are measured with respect to supply GND, unless otherwise specified.
Note 3: For operating at case temperatures above 25˚C, the device must be derated based on a 150˚C maximum junction temperature and a thermal resistance
of
θJC = 1.0˚C/W (junction to case). Refer to the Thermal Resistance figure in the Application Information section under Thermal Considerations.
Note 4: Human body model, 100 pF discharged through a 1.5 k
Ω resistor.
Note 5: The operating junction temperature maximum is 150˚C, however, the instantaneous Safe Operating Area temperature is 250˚C.
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: The LM3875T package TA11B is a non-isolated package, setting the tab of the device and the heat sink at Vpotential when the LM3875 is directly mounted
to the heat sink using only thermal compound. If a mica washer is used in addition to thermal compound,
θCS (case to sink) is increased, but the heat sink will be
isolated from V.
Note 9: The feedback compensation network limits the bandwidth of the closed-loop response and so the slew rate will be reduced due to the high frequency roll-off.
Without feedback compensation, the slew rate is typically 16V/µs.
Note 10: The output dropout voltage is the supply voltage minus the clipping voltage. Refer to the Clipping Voltage vs. Supply Voltage graph in the Typical
Performance Characteristics section.
Test Circuit #1 (DC Electrical Test Circuit)
01144903
www.national.com
4


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