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LM2904-Q1 Datasheet(PDF) 24 Page - Texas Instruments

Part # LM2904-Q1
Description  LM2904-Q1, LM2904B-Q1, and LM2904BA-Q1 Industry-Standard Dual Operational Amplifiers for Automotive Applications
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM2904-Q1 Datasheet(HTML) 24 Page - Texas Instruments

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12 Layout
12.1 Layout Guidelines
For best operational performance of the device, use good PCB layout practices, including:
• Noise can propagate into analog circuitry through the power pins of the circuit as a whole, as well as the
operational amplifier. Bypass capacitors are used to reduce the coupled noise by providing low-impedance
power sources local to the analog circuitry.
– Connect low-ESR, 0.1-µF ceramic bypass capacitors between each supply pin and ground, placed as
close to the device as possible. A single bypass capacitor from V+ to ground is applicable for single-
supply applications.
• Separate grounding for analog and digital portions of circuitry is one of the simplest and most-effective
methods of noise suppression. One or more layers on multilayer PCBs are usually devoted to ground planes.
A ground plane helps distribute heat and reduces EMI noise pickup. Make sure to physically separate digital
and analog grounds, paying attention to the flow of the ground current.
• To reduce parasitic coupling, run the input traces as far away from the supply or output traces as possible. If it
is not possible to keep them separate, it is much better to cross the sensitive trace perpendicular as opposed
to in parallel with the noisy trace.
• Place the external components as close to the device as possible. Keeping RF and RG close to the inverting
input minimizes parasitic capacitance, as shown in Section 12.2.
• Keep the length of input traces as short as possible. Always remember that the input traces are the most
sensitive part of the circuit.
• Consider a driven, low-impedance guard ring around the critical traces. A guard ring can significantly reduce
leakage currents from nearby traces that are at different potentials.
12.2 Layout Examples
OUT1
OUT2
IN1
í
IN1+
V
í
V+
IN2
í
IN2+
RG
RIN
RF
GND
VIN
VS
í
GND
VS+
GND
Run the input traces as far
away from the supply lines
as possible
Only needed for
dual-supply
operation
Place components close to
device and to each other to
reduce parasitic errors
Use low-ESR, ceramic
bypass capacitor
(or GND for single supply)
Ground (GND) plane on another layer
Figure 12-1. Operational Amplifier Board Layout for Noninverting Configuration
+
RIN
RG
RF
VOUT
VIN
Figure 12-2. Operational Amplifier Schematic for Noninverting Configuration
LM2904-Q1, LM2904B-Q1, LM2904BA-Q1
SLOS414K – MAY 2003 – REVISED APRIL 2022
www.ti.com
24
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Copyright © 2022 Texas Instruments Incorporated
Product Folder Links: LM2904-Q1 LM2904B-Q1 LM2904BA-Q1


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