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參數(shù)資料
| 型號(hào)： | TL441N |
| 廠(chǎng)商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 模擬運(yùn)算功能 |
| 英文描述： | LOG OR ANTILOG AMPLIFIER, 40 MHz BAND WIDTH, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁(yè)數(shù)： | 5/15頁(yè) |
| 文件大小： | 226K |
| 代理商： | TL441N |
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TL441
LOGARITHMIC AMPLIFIER
SLVS328 – OCTOBER 2000
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Z
A1
A2
Y
B1
B2
TL441
A1
A2
Y
1/2
TL441
Input
A
Input
B
see
Note A
OUTPUT W
(see Note B)
RR
R
RR
R
+
–
+
–
+
–
+
–
+
–
NOTES: A. Connections shown are for multiplication. For division, Z and Z connections are reversed.
B. Output W may need to be amplified to give actual product or quotient of A and B.
C. R designates resistors of equal value, typically 2 k
to 10 k.
Multiplication: W = A
B log W = log A + log B, or W = a(logaA + logaB)
Division: W = A/B
log W = log A – log B, or W = a(logaA + logaB)
Figure 16. Multiplication or Division
Input
A
A1
A2
Y
1/2
TL441
Z
B1
B2
Output
W
1/2
TL441
RR
R
nR
R
nR
R
–
+
–
+
–
+
NOTE: R designates resistors of equal value, typically 2 k
to 10 k. The power to which the input variable is raised is fixed by setting nR.
Output W may need to be amplified to give the correct value.
Exponential: W = An
log W = n log A, or W = a(n loga A)
Figure 17. Raising a Variable to a Fixed Power
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