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LOG114 Datasheet(PDF) 12 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
Part # LOG114
Description  Single-Supply, High-Speed, Precision LOGARITHMIC AMPLIFIER
PDF  29 Pages
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

LOG114 Datasheet(HTML) 12 Page - Burr-Brown (TI)

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LOG114
SBOS301A − MAY 2004 − REVISED MARCH 2007
www.ti.com
12
Q
1
R
REF
1.62M
Ω
+2.5V
4
1
5
3
15
13
12
16
V
− Com
Q
2
V
1
86
7
+5V
I
2
I
1
I
µA
REF3040
or
REF3240
4.096V
Reference
10
µF
+
1000pF
Input current
from photodiode
Photodiode(4)
or current source
R
1
R
2
R
5
100k
Ω
R
7
100k
Ω
R
8
316k
Ω
R
6
66.5k
Ω
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 single−supply configuration, V
CM IN must be connected to ≥ 1V.
(2) V
LOGOUT = 0.375 × log(I1/I2)+ 2.5V.
(3) V
O4 = − 0.249 × log(I1/I2)+ 1.5V.
(4) The cathode of the photodiode is returned to V
REF resultinginzerobias across it. Thecathode
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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