參數(shù)資料
型號(hào): LOG114AIRGVT
廠商: TEXAS INSTRUMENTS INC
元件分類(lèi): 模擬運(yùn)算功能
英文描述: LOG OR ANTILOG AMPLIFIER, PQCC16
封裝: 4 X 4 MM, GREEN, PLASTIC, QFN-16
文件頁(yè)數(shù): 9/29頁(yè)
文件大?。?/td> 637K
代理商: LOG114AIRGVT
LOG114
SBOS301A MAY 2004 REVISED MARCH 2007
www.ti.com
17
NEGATIVE INPUT CURRENTS
The LOG114 functions only with positive input currents
(conventional current flows into input current pins). In
situations where negative input currents are needed,
the example circuits in Figure 7, Figure 8, and Figure 9
may be used.
Q
B
National
LM394
I
IN
I
OUT
D
1
OPA703
D
2
Q
A
Figure 7. Current Inverter/Current Source.
1.5k
Photodiode
10nA to 1mA
+5V
1k
+3.3V
1/2
OPA2335
1/2
OPA2335
BSH203
(+3.3V
Back Bias)
LOG114
Pin3 or Pin4
Figure 8. Precision Current Inverter/Current Source.
1k
+5V
1.5k
1.5k
100k
10nA to 1mA
+3.3V
LOG114
10nA to 1mA
100k
100k
+3.3V
1/2
OPA2335
1/2
OPA2335
Photodiode
Back Bias
Pin 3 or Pin 4
100k
Figure 9. Precision Current Inverter/Current Source.
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