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LM4874 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM4874 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 21 page Electrical Characteristics for LM4874 (Notes 2, 8) (Continued) Note 6: Machine Model, 220pF-240pF discharged through all pins. Note 7: The given θJA is for an LM4874 packaged in an MXA20A with the exposed-DAP soldered to an exposed 2in2 area of 1oz printed circuit board copper. When driving 4 Ω loads from a 5V supply, the LM4874MH must be mounted to the circuit board and its exposed-DAP soldered to an exposed 2in2 area of 1oz PCB copper. Note 8: Typicals are measured at 25˚C and represent the parametric norm. Note 9: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 10: Datasheet minimum and maximum specification limits are guaranteed by design, test, or statistical analysis. Note 11: Output power is measured at the amplifier’s package pins. Note 12: When driving 3 Ω or 4Ω loads and operating on a 5V supply, the LM4874MH must be mounted to a circuit board that has a minimum of 2in2 of exposed, uninterrupted copper area connected to the MH package’s exposed DAP. External Components Description See Figure 1. Components Functional Description 1. C i The input coupling capacitor blocks DC voltage at the amplifier’s inverting input terminals. C i, along with the LM4874’s variable input resistance R 1 (See Table 1), creates a highpass filter with fC = 1/(2 πR iCi). Both inverting and noninverting inputs require a C i. Refer to the Application Information section, SELECTING EXTERNAL COMPONENTS, for an explanation of determining the value of C i. 2. C S The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about properly placing, and selecting the value of, this capacitor. 3. C B The capacitor, C B, filters the half-supply voltage present on the BYPASS pin. Refer to the Application Information section, SELECTING EXTERNAL COMPONENTS, for information concerning proper placement and selecting C B’s value. Typical Performance Characteristics MH Specific Characteristics THD vs Frequency THD vs Frequency 20046998 V DD = 5V, RL =4 Ω,P OUT = 1000mW, at (from top to bottom at 1kHz): A V = 21.6dB, AV = 15.6dB, A V = 10dB, AV = 6dB 20046997 V DD = 5V, RL =8 Ω,P OUT = 400mW, at (from top to bottom at 1kHz): A V = 21.6dB, AV = 15.6dB, A V = 10dB, AV = 6dB www.national.com 4 |
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