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參數(shù)資料
| 型號： | LOG100JP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬運算功能 |
| 英文描述： | LOG OR ANTILOG AMPLIFIER, 0.045 MHz BAND WIDTH, CDIP14 |
| 封裝： | HERMETIC SEALED, CERAMIC, DIP-14 |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 112K |
| 代理商： | LOG100JP |
LOG100
9
FIGURE 10. Current Inverter.
Q
B
National
LM394
I
IN
I
OUT
D
1
D
2
Q
A
FIGURE 11. Connections for Antilog Function.
ANTILOG CONFIGURATION (an implicit technique)
scale the log amp to use as much of the
±10V output range
as possible. Thus, with the range of I
1
from I
1 MIN
to
I
1 MAX ;
For I
1 MAX
+ 10V = K log I
1 MAX /I2
(24)
For I
1 MIN
– 10V = K log I
1 MIN /I2
(25)
Addition of these two equations and solving for I
2 shows that
its optimum value, I
2 OPT, is the geometric mean of I1 MAX and
I
1 MIN.
I
2 OPT =
I
1 MAX
x I
1 MIN
(26)
K
OPT =
(27)
Since K is selectable in discrete steps, use the largest value
of K available which does not exceed K
OPT.
NEGATIVE INPUT CURRENTS
The LOG100 will function only with positive input currents
(conventional current flow into pins 1 and 14). Some current
sources (such as photomultiplier tubes) provide negative
input currents. In such situations, the circuit in Figure 10
may be used.(1)
VOLTAGE INPUTS
The LOG100 gives the best performance with current in-
puts. Voltage inputs may be handled directly with series
resistors, but the dynamic input range is limited to approxi-
mately three decades of input voltage by voltage noise and
offsets. The transfer function of equation (20) applies to this
configuration.
I
REF
14
1
5
43
6
10
7
V
OUT
9
–V
CC
+V
CC
+
–
LOG100
R
C
C = 0.01F
V
IN
V
OUT = IREF R Antilog
–
V
IN
K
K = 1 when V
IN connected to pin 3.
K = 3 when V
IN connected to pin 4.
K = 5 when V
IN connected to pin 5.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
NOTE: (1) More detailed information may be found in “Properly Designed Log
Amplifiers Process Bipolar Input Signals” by Larry McDonald, EDN, 5 Oct. 80,
pp 99–102.
10
I
2 OPT
I
1 MAX
log
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