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LOG200 bảng dữ liệu(PDF) 28 Page - Texas Instruments

tên linh kiện LOG200
Giải thích chi tiết về linh kiện  LOG200 Precision, High-Speed Logarithmic Amplifier With Integrated Photodiode Bias
PDF  42 Pages
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LOG200 bảng dữ liệu(HTML) 28 Page - Texas Instruments

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7.4.2 Layout Example
+
–
+
–
+
–
I2
I1
PD
Bias
IBIAS
VCM
+
–
REFGND
+
–
2.5V
1.65V
REF25
REF165
+
–
REFA
OUTA
OUTB
–IN
+IN
VS+
VS–
VS+
1 A
IREF
I2
I1
R1
R2
ADC
INN
INP
C5
R3
R4
VREF
C4
C3
3.3V
1.65V
5V
C1
C7
330pF
Ceramic
1.65V
C6
33pF
Ceramic
2.5V
–5V
C2
LOG200
2.5V
RBIAS
CBIAS
Footprint
Photodiode
C8
220pF
Ceramic
Figure 7-10. LOG200 Example Circuit
GND
GND
GND
GND
INP
INN
R
3
R
4
C
5
C
3
C
4
I1
VCM
I2
4
IREF
1
2
3
OUTB
OUTA
REFA
9
REF165
12
11
10
PAD
R
BIAS
V
S–
C
1
REF165
V
CM
Use guard traces to
shield the input signal
Place bypass
capacitors as close to
device as possible
Consider using
thermal vias for
heatsinking
If I2 is not driven by
IREF, I2 should also be
guarded
REF165
GND
C
2
V
S+
R
2
R
1
OUTA
OUTA
Cutouts on ground planes
underneath the device
can reduce stray
capacitance and leakage
REF25
Photodiode
REF25
If diode capacitance is
very high, a CBIAS
capacitance to GND
can be necessary for
stability
C
6
C
7
C
8
GND
Figure 7-11. LOG200 Example Layout
LOG200
SBOSA28A – AUGUST 2023 – REVISED DECEMBER 2024
www.ti.com
28
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Copyright © 2024 Texas Instruments Incorporated
Product Folder Links: LOG200



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