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LM4781 Datasheet(Fiches technique) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numéro de pièce LM4781
Description  Overture™ Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier with Mute
Télécharger  25 Pages
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Fabricant  NSC [National Semiconductor (TI)]
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Electrical Characteristics (Notes 1, 2) (Continued)
The following specifications apply for V
+ = +28V, V- = −28V, I
MUTE = -1mA/channel and RL =8
Ω unless otherwise specified.
Limits apply for T
A = 25˚C.
(Note 6)
(Notes 7, 8)
Common Mode Rejection Ratio
(Note 15)
+ = 30V to 10V, V- = -10V to -30V
CM = 20V to -20V, IO = 0mA
dB (min)
Open Loop Voltage Gain
+|=|V-| = 28V, R
L =2k
O = 20V
dB (min)
Gain Bandwidth Product
+|=|V-| = 28V, f
IN = 100kHz
IN = 50mVRMS
MHz (min)
Input Noise
IHF-A-Weighting Filter,
IN = 600
Ω (Input Referred)
µV (max)
Signal-to-Noise Ratio
O =1WRMS; A-Weighted Filter
IN = 1kHz, RS =25
O = 25WRMS; A-Weighted Filter
IN = 1kHz, RS =25
Intermodulation Distortion
60Hz, 7kHz, 4:1 (SMPTE)
60Hz, 7kHz, 1:1 (SMPTE)
Note 1: All voltages are measured with respect to the ground pins, 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
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 3: The maximum power dissipation must be de-rated at elevated temperatures and is dictated by TJMAX, θJC, and the ambient temperature TA. The maximum
allowable power dissipation is PDMAX =(TJMAX -TA)/θJC or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4781, TJMAX = 150˚C
and the typical
θJC is 0.9˚C/W. Refer to the DETERMINING THE CORRECT HEAT SINK section for more information.
Note 4: Human body model, 100pF discharged through a 1.5k
Ω resistor.
Note 5: Machine Model: a 220pF - 240pF discharged through all pins.
Note 6: Typical specifications are measured at 25˚C and represent the parametric norm.
Note 7: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: The maximum operating junction temperature is 150˚C. However, the instantaneous Safe Operating Area temperature is 250˚C.
Note 10: V- must have at least - 9V at its pin with reference to GND in order for the under-voltage protection circuitry to be disabled. In addition, the voltage
differential between V+ and V- must be greater than 14V.
Note 11: Cross talk performance was measured using the demo board shown in the datasheet. PCB layout will affect cross talk. It is recommended that the input
and output traces be separated by as much distance as possible. Return ground traces from outputs should also be independent back to sinlge ground point and
use as wide of traces as possible.
Note 12: 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.
Note 13: The Differential Input Voltage Absolute Maximum Rating is based on supply voltages V+ = 30V and V- = - 30V.
Note 14: The TA27A is a non-isolated package. The package’s metal back and any heat sink to which it is mounted are connected to the V- potential when 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 electrically isolated from
Note 15: DC electrical test.

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Numéro de composants électroniques

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