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LM4985TM Fiches technique(PDF) 9 Page - National Semiconductor (TI) |
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LM4985TM Fiches technique(HTML) 9 Page - National Semiconductor (TI) |
9 / 29 page Electrical Characteristics V DD = 2.5V (Notes 1, 2) (Continued) The following specifications apply for R L =16 Ω, f = 1kHz, and C B = 4.7µF unless otherwise specified. Limits apply to TA = 25˚C. Symbol Parameter Conditions LM4985 Units (Limits) Typ (Note 6) Limit (Notes 7, 8) A VMAX Maximum Gain Code = 11111 18 dB ∆A V Gain Accuracy per Step 18dB ≥ A V ≥ –44dB –44dB ≥ A V > –76dB ± 0.5 ± 1.0 dB V OS Output Offset Voltage OCL R LOAD =32 Ω V IN =ACGND 2.0 mV 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 PDMAX =(TJMAX -TA)/ θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4985, see power derating currents for more information. Note 4: Human Body Model: 100pF discharged through a 1.5k Ω resistor. Note 5: Machine Model: 200pF ≤ Cmm ≤ 220pF 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: 10 Ω terminated input. Note 10: The LDA10A package has its exposed-DAP soldered to an exposed 1.2in2 area of 1oz. Printed circuit board copper. Note 11: The wake-up time (TWU) is calculated using the following formula; TWU =[CBYPASS (VDD)/2(IBYPASS)] + 40ms. External Components Description (Figure 2) Components Functional Description 1. C I Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a high-pass filter with R i at fc = 1/(2 πR iCi). Refer to the section Proper Selection of External Components, for an explanation of how to determine the value of C i. 2. C S Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing section for information concerning proper placement and selection of the supply bypass capacitor. 3. C B Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of Proper Components, for information concerning proper placement and selection of C B 6. C o Output coupling capacitor which blocks the DC voltage at the amplifier’s output. Forms a high pass filter with R L at fo = 1/(2 πR LCo) www.national.com 9 |
Numéro de pièce similaire - LM4985TM |
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Description similaire - LM4985TM |
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