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LM4681SQ Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM4681SQ Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 19 page Electrical Characteristics (Notes 1, 2, 7) (Continued) The following specifications apply for V DD = 12V, I 2CV DD = 5V, RL =8 Ω, LC filter values as shown in Figure 1, unless other- wise specified. Limits apply for T A = 25˚C. Symbol Parameter Conditions LM4681 Units Typical Limit PSRR Power Supply Rejection Ratio V RIPPLE = 200mVP-P, C BYPASS1 = 10µF, input referred f = 50Hz f = 60Hz f = 100Hz f = 120Hz f = 1kHz 82 84 92 95 95 dB Headphone Amplifiers P O Maximum Power Output Per Channel THD+N ≤ 1%, R L =32 Ω, f IN = 1kHz 94 70 mW (min) THD+N Distortion + Noise P O = 20mW, RL =32 Ω, f IN = 1kHz 0.02 % V NOISE Output Noise Voltage, RMS R IN =50 Ω,C IN = 1µF, BW = 20Hz to 20kHz, R L =32 Ω A-weighted, Input referred 22 µV PSRR Power Supply Rejection Ratio (Referred to Input) 200mV, 1kHz, V IN =0,RL =32 Ω 77 dB Electrical Characteristics for Volume Control (Notes 1, 2) The following specifications apply for V DD = 12V. Limits apply for TA = 25˚C. Symbol Parameter Conditions LM4681 Units (Limits ) Typical (Note 8) Limit (Note 7) C RANGE Gain Range Digital Code = Full Scale, No Load Power Amplifier Headphone Amplifier 30 13 29 12 dB (min) dB (min) Digital Code = +1LSB, No Load Power Amplifier Headphone Amplifier –48 –65 –46 –63 dB (min) dB (min) A M Mute Gain Digital Code = 0, No Load Power Amplifier Headphone Amplifier –76 –74 –74 dB (max) dB (max) Note 1: All voltages are measured with respect to the ground 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: 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 θJA = 80˚C/W (junction to ambient). 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: The operating junction temperature maximum is 150˚C. Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 8: Typicals are measured at 25˚C and represent the parametric norm. www.national.com 5 |
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