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LM4867 bảng dữ liệu(PDF) 11 Page - National Semiconductor (TI) |
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LM4867 bảng dữ liệu(HTML) 11 Page - National Semiconductor (TI) |
11 / 28 page Typical Performance Characteristics (Continued) Power Supply Rejection Ratio Open Loop Frequency Response 20001321 20001322 Supply Current vs Supply Voltage 20001323 External Components Description Figure 1 Components Functional Description 1. R i Inverting input resistance which sets the closed-loop gain in conjunction with R f. This resistor also forms a high pass filter with C i at fc = 1/(2 πR iCi). 2. C i Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a highpass 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. 3. R f Feedback resistance which sets the closed-loop gain in conjunction with R i. 4. 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. 5. C B Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of External Components, for information concerning proper placement and selection of C B. Application Information ELIMINATING OUTPUT COUPLING CAPACITORS Typical single-supply audio amplifiers that can switch be- tween driving bridge-tied-load (BTL) speakers and single- ended (SE) headphones use a coupling capacitor on each SE output. This capacitor blocks the half-supply voltage to which the output amplifiers are typically biased and couples the audio signal to the headphones. The signal return to circuit ground is through the headphone jack’s sleeve. The LM4867 eliminates these coupling capacitors. Amp2A is internally configured to apply V DD/2 to a stereo headphone jack’s sleeve. This voltage matches the quiescent voltage present on the Amp1A and Amp1B outputs that drive the headphones. The headphones operate in a manner very similar to a bridge-tied-load (BTL). The same DC voltage is www.national.com 11 |
Số phần tương tự - LM4867_02 |
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Mô tả tương tự - LM4867_02 |
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