參數(shù)資料
型號(hào)： LM4868MTEX/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 音頻／視頻放大
英文描述： 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20
封裝： 6.50 X 4.40 MM, 0.90 MM HEIGHT, EXPOSED PAD, PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 11/28頁(yè)
文件大?。?/td> 792K
代理商： LM4868MTEX/NOPB
Application Information (Continued)
f
L = 100Hz/5 = 20Hz
(12)
and an
f
H = 20kHz x 5 = 100kHz
(13)
As mentioned in the Selecting Proper External Compo-
nents section, R
i and Ci create a highpass filter that sets the
amplifier’s lower bandpass frequency limit. Find the coupling
capacitor’s value using Equation (12).
C
i
≥ 1/(2πR
ifL)
(14)
The result is
1/(2
π*20k*20Hz) = 0.397F
(15)
Use a 0.39F capacitor, the closest standard value.
The product of the desired high frequency cutoff (100kHz in
this example) and the differential gain A
VD, determines the
upper passband response limit. With A
VD = 3 and fH =
100kHz, the closed-loop gain bandwidth product (GBWP) is
300kHz. This is less than the LM4868’s 3.5MHz GBWP. With
this margin, the amplifier can be used in designs that require
more differential gain while avoiding performance,restricting
bandwidth limitations.
RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT
Figures 9 through 13 show the recommended four-layer PC
board layout that is optimized for the 24-pin LQ-packaged
LM4868 and associated external components. Figures 14
through 18 show the recommended four-layer PC board
layout that is optimized for the 24-pin MTE-packaged
LM4868 and associated external components. Figures 19
through 21 show the recommended two-layer PC board
layout that is optimized for the 20-pin MT-packaged LM4868
and associated external components. These circuits are de-
signed for use with an external 5V supply and 4
speakers
(or greater) for the MT-packaged LM4868 or 3
speakers (or
greater) for the LQ- and MTE-packaged LM4868.
These circuit boards are easy to use. Apply 5V and ground to
the board’s V
DD and GND pads, respectively. Connect 4
speakers between the board’s OUTA and +OUTA and
OUTB and +OUTB pads.
20026778
FIGURE 9. Recommended LQ PC Board Layout:
Component-Side Silkscreen
LM4868
www.national.com
19
相關(guān)PDF資料
PDF描述
LM4868MT/NOPB 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20
LM4868MTX/NOPB 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20
LM4868LQ/NOPB 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC24
LM4868LQX/NOPB 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC24
LM4869MH/NOPB 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20
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