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LOG200 датащи(PDF) 24 Page - Texas Instruments

номер детали LOG200
подробное описание детали  LOG200 Precision, High-Speed Logarithmic Amplifier With Integrated Photodiode Bias
PDF  42 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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LOG200 датащи(HTML) 24 Page - Texas Instruments

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7.2 Typical Application
7.2.1 Optical Current Sensing
A common use case for the LOG200 is an optical current sense circuit, using an external photodiode. Figure 7-5
shows an implementation using an InGaAs, PIN photodiode for a λ = 1.31μm application. This design uses ±5V
supplies, and is intended for use with input currents from 10nA to 100µA. Decoupling capacitors are not shown
for brevity. The design can be easily implemented using the LOG200 Evaluation Module board. For additional
information, bench measurements, and examples for interfacing the LOG200 with photodiodes, see the Perform
Accurate Optical Power Measurements With The LOG200 application note.
100
To Oscilloscope
Photodiode
+
–
+
–
+
–
I2
I1
PD
Bias
IBIAS
VCM
+
–
REFGND
+
–
2.5V
1.65V
REF25
REF165
+
–
REFA
OUTA
OUTB
–IN
+IN
VS+
VS–
VS+
1μA
IREF
I2
I1
2.5V
2.5V
5V
5V
LOG200
–5V
Figure 7-5. LOG200 Optical Current-Sensing Application
LOG200
SBOSA28A – AUGUST 2023 – REVISED DECEMBER 2024
www.ti.com
24
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Product Folder Links: LOG200



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