參數(shù)資料
型號(hào): LOG114AIRGVT
元件分類(lèi): 對(duì)數(shù)放大器
英文描述: Single-Supply, High-Speed, Precision LOGARITHMIC AMPLIFIER
中文描述: 單電源,高速,精密對(duì)數(shù)放大器
文件頁(yè)數(shù): 12/30頁(yè)
文件大?。?/td> 616K
代理商: LOG114AIRGVT
"#$$%
SBOS301A MAY 2004 REVISED MARCH 2007
www.ti.com
12
Q
1
R
1.62M
+2.5V
4
1
5
3
15
13
12
16
V
Com
6
Q
2
V
1
8
7
+5V
I
2
I
1
I
μ
A
REF3040
or
REF3240
4.096V
Reference
10
μ
F
+
1000pF
Input current
from photodiode
or current source
Photodiode
(4)
R
1
R
2
R
5
100k
R
7
100k
R
8
316k
R
6
66.5k
R
3
R
4
V
O4(3)
IN
4
+IN
4
V
LOGOUT(2)
+IN
5
IN
5
V
O5
V
CM IN(1)
I
1
V
REF
2.5V
REF
V
REF GND
A
3
A
1
A
2
A
4
A
5
I
2
LOG114
11
10
9
V
Com
= +2.5V
NOTE: (1) In singlesupply configuration, V
must be connected to
1V.
(2) V
LOGOUT
= 0.375
×
log(I
/I
) + 2.5V.
(3) V
0.249
×
log(I
/I
) + 1.5V.
(4) The cathode of the photodiode is returned to V
resulting in zero bias across it. The cathode
could be returned to a voltage more positive than V
CM IN
to create a reverse bias for reducing
photodiode capacitance, which increases speed.
Figure 2. Single-Supply Configuration Example for Measurement Over Eight Decades.
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