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OPA2388IDGKR Datasheet(PDF) 26 Page - Texas Instruments

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Part No. OPA2388IDGKR
Description  OPAx388 Precision, Zero-Drift, Zero-Crossover, True Rail-to-Rail, Input/Output Operational Amplifiers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

OPA2388IDGKR Datasheet(HTML) 26 Page - Texas Instruments

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N/C
±IN
+IN
V+
OUTPUT
N/C
N/C
VS+
GND
Ground (GND) plane on another layer
VOUT
VIN
GND
Run the input traces
as far away from
the supply lines
as possible
RF
RG
Place components close
to device and to each
other to reduce parasitic
errors
Use low-ESR,
ceramic bypass
capacitors
Copyright © 2017, Texas Instruments Incorporated
GND
+
VIN
VOUT
RG
RF
26
OPA388, OPA2388, OPA4388
SBOS777C – DECEMBER 2016 – REVISED MAY 2019
www.ti.com
Product Folder Links: OPA388 OPA2388 OPA4388
Submit Documentation Feedback
Copyright © 2016–2019, Texas Instruments Incorporated
10 Layout
10.1 Layout Guidelines
Paying attention to good layout practice is always recommended. Keep traces short and, when possible, use a
printed-circuit board (PCB) ground plane with surface-mount components placed as close to the device pins as
possible. Place a 0.1-µF capacitor closely across the supply pins. These guidelines must be applied throughout
the analog circuit to improve performance and provide benefits such as reducing the electromagnetic interference
(EMI) susceptibility.
For lowest offset voltage and precision performance, circuit layout and mechanical conditions must be optimized.
Avoid temperature gradients that create thermoelectric (Seebeck) effects in the thermocouple junctions formed
from connecting dissimilar conductors. These thermally-generated potentials can be made to cancel by assuring
they are equal on both input terminals. Other layout and design considerations include:
Use low thermoelectric-coefficient conditions (avoid dissimilar metals).
Thermally isolate components from power supplies or other heat sources.
Shield operational amplifier and input circuitry from air currents, such as cooling fans.
Following these guidelines reduces the likelihood of junctions being at different temperatures, which can cause
thermoelectric voltage drift of 0.1 µV/°C or higher, depending on materials used.
10.2 Layout Example
Figure 49. Schematic Representation
Figure 50. OPA388 Layout Example


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