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LOG200 Datasheet(PDF) 18 Page - Texas Instruments

Part # LOG200
Description  LOG200 Precision, High-Speed Logarithmic Amplifier With Integrated Photodiode Bias
PDF  25 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LOG200 Datasheet(HTML) 18 Page - Texas Instruments

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8.4.2 Layout Example
+
–
+
–
+
–
I2
I1
PD
Bias
IBIAS
VCM
+
–
REFGND
+
–
2.5 V
1.65 V
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
3.3 V
1.65 V
5 V
C1
C7
330 pF
Ceramic
1.65 V
C6
33 pF
Ceramic
2.5 V
–5 V
C2
LOG200
2.5 V
RBIAS
CBIAS
Footprint
Photodiode
C8
220 pF
Ceramic
Figure 8-10. 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 8-11. LOG200 Example Layout
LOG200
SBOSA28 – AUGUST 2023
www.ti.com
18
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Copyright © 2023 Texas Instruments Incorporated
Product Folder Links: LOG200



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