參數(shù)資料
型號(hào)： LM4908LQ/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 音頻／視頻放大
英文描述： 0.157 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC8
封裝： LLP-8
文件頁(yè)數(shù)： 17/21頁(yè)
文件大?。?/td> 935K
代理商： LM4908LQ/NOPB
External Components Description (Figure 1)
Components
Functional Description
1. R
i
The inverting input resistance, along with R
f, set the closed-loop gain. Ri, along with Ci, form a high
pass filter with f
c = 1/(2
πR
iCi).
2. C
i
The input coupling capacitor blocks DC voltage at the amplifier’s input terminals. C
i, along with Ri,
create a highpass filter with f
C = 1/(2
πR
iCi). Refer to the section, Selecting Proper External
Components, for an explanation of determining the value of C
i.
3. R
f
The feedback resistance, along with R
i, set closed-loop gain.
4. C
S
This is the supply bypass capacitor. It provides power supply filtering. Refer to the Application
Information section for proper placement and selection of the supply bypass capacitor.
5. C
B
This is the half-supply bypass pin capacitor. It provides half-supply filtering. Refer to the section,
Selecting Proper External Components, for information concerning proper placement and selection
of C
B.
6. C
O
This is the output coupling capacitor. It blocks the DC voltage at the amplifier’s output and forms a high
pass filter with R
L at fO = 1/(2
πR
LCO)
7. R
B
This is the resistor which forms a voltage divider that provides 1/2 V
DD to the non-inverting input of the
amplifier.
Typical Performance
Characteristics
THD+N vs Frequency
V
DD = 2.6V, PWR = 15mW, RL =8
THD+N vs Frequency
V
DD = 2.6V, PWR = 15mW, RL =16
20075267
20075268
LM4908
www.national.com
5
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