參數(shù)資料
型號(hào)： TL441AM
廠商： Texas Instruments, Inc.
元件分類： 運(yùn)動(dòng)控制電子
英文描述： LOGARITHMIC AMPLIFIER
中文描述： 對(duì)數(shù)放大器
文件頁(yè)數(shù)： 12/14頁(yè)
文件大小： 233K
代理商： TL441AM
TL441AM
LOGARITHMIC AMPLIFIER
SLFS038 – JUNE 1976 – REVISED FEBRUARY 1989
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Z
Z
A1
A2
Y
Y
B1
B2
TL441
A1
A2
Y
Y
1/2
TL441
Input
A
Input
B
see
Note A
OUTPUT W
(see Note B)
R
R
R
R
R
R
R
R
R
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
Y
1/2
TL441
Z
Z
B1
B2
Output
W
1/2
TL441
R
R
R
nR
R
nR
R
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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