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LM4951 Scheda tecnica(PDF) 4 Page - National Semiconductor (TI) |
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LM4951 Scheda tecnica(HTML) 4 Page - National Semiconductor (TI) |
4 / 18 page Electrical Characteristics V DD = 3.3V (Notes 1, 2) (Continued) The following specifications apply for V DD = 3.3V, AV-BTL = 6dB, RL =8 Ω unless otherwise specified. Limits apply for T A = 25˚C. Symbol Parameter Conditions LM4951 Units (Limits) Typical (Note 6) Limit (Notes 7, 8) P O Output Power THD = 1% (max); f = 1kHz R L =8 Ω Mono BTL 280 230 W (min) THD+N Total Harmomic Distortion + Noise1 P O = 100mWrms; f = 1kHz A V-BTL = 6dB 0.07 0.5 % (max) THD+N Total Harmomic Distortion + Noise1 P O = 100mWrms; f = 1kHz A V-BTL = 26dB 0.35 % e OS Output Noise A-Weighted Filter, R i =Rf = 20k Ω Input Referred, Note 10 10 µV PSRR Power Supply Rejection Ratio V RIPPLE = 200mVp-p, f = 217Hz, C B = 1µF, Input Referred 71 61 dB (min) Note 1: All voltages are measured with respect to the GND pin, 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 derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature, TA. The maximum allowable power dissipation is P DMAX =(TJMAX −TA)/ θJA or the given in Absolute Maximum Ratings, whichever is lower. For the LM4951 typical application (shown in Figure 1) with VDD = 7.5V, RL =8Ω mono-BTL operation the max power dissipation is 1.42W. θJA = 73˚C/W. Note 4: Human body model, 100pF discharged through a 1.5k Ω resistor. Note 5: Machine Model, 220pF–240pF discharged through all pins. 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: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. Note 9: Shutdown current is measured in a normal room environment. The Shutdown pin should be driven as close as possible to GND for minimum shutdown current. Note 10: Noise measurements are dependent on the absolute values of the closed loop gain setting resistors (input and feedback resistors). www.national.com 4 |
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