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參數(shù)資料
| 型號： | LM4901IBPX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.05 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封裝： | MICRO, SMD-9 |
| 文件頁數(shù)： | 17/21頁 |
| 文件大?。?/td> | 1074K |
| 代理商： | LM4901IBPX |
Electrical Characteristics V
DD = 2.6V (Notes 1, 2, 8)
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for T
A =
25C. (Continued)
Note 12: All bumps have the same thermal resistance and contribute equally when used to lower thermal resistance.
Note 13: Maximum power dissipation in the device (PDMAX) occurs at an output power level significantly below full output power. PDMAX can be calculated using
Equation 1 shown in the Application Information section. It may also be obtained from the power dissipation graphs.
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/(2π RiCi).
2.
C
i
Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a
highpass filter with R
i at fc = 1/(2π RiCi). 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.
Typical Performance Characteristics
THD+N vs Frequency
at V
DD =5V, 8 RL, and PWR = 500mW
DS200198-30
THD+N vs Frequency
at V
DD =3V, 8 RL, and PWR = 250mW
DS200198-31
THD+N vs Frequency
at V
DD = 2.6V, 8 RL, and PWR = 150mW
DS200198-32
THD+N vs Frequency
at V
DD = 2.6V, 4 RL, and PWR = 150mW
DS200198-33
LM4901
www.national.com
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