参数资料
型号: LM4854LD/NOPB
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: 音频/视频放大
英文描述: 0.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO14
封装: LLP-14
文件页数: 29/29页
文件大小: 1440K
代理商: LM4854LD/NOPB
External Components Description
Components
Functional Description
1.
R
i
This is the inverting input resistance that, along with R
f, sets the closed-loop gain. Input resistance Ri and
input capacitance C
i form a high pass filter. The filter’s cutoff frequency is fc = 1/2
πR
iCi.
2.
C
i
This is the input coupling capacitor. It blocks DC voltage at the amplifier’s inverting input. C
i and Ri create a
highpass filter. The filter’s cutoff frequency is f
c = 1/2
πR
iCi. Refer to the Application Information section,
SELECTING EXTERNAL COMPONENTS, for an explanation of determining C
i’s value.
3.
R
f
This is the feedback resistance that, along with R
i, sets the closed-loop gain.
4.
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.
5.
C
B
This capacitor filters the half-supply voltage present on the BYPASS pin. Refer to the Application
Information section, SELECTING EXTERNAL COMPONENTS, for information about properly placing, and
selecting the value of, this capacitor..
Typical Performance Characteristics
THD+N vs Frequency
200382D8
LM4854LD
V
DD = 5V, RL =4
(BTL),
P
OUT = 1000mW
200382D9
LM4854LD
V
DD = 5V, RL =4
(BTL),
P
OUT = 400mW
THD+N vs Frequency
200382C0
V
DD = 5V, RL =8
(BTL),
P
OUT = 400mW
200382B8
V
DD = 5V, RL =16
(SE),
P
OUT = 50mW
LM4854
www.national.com
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