INA195_15 Datasheet, PDF (24/33 Pages) Texas Instruments – INA19x Current Shunt Monitor −16 V to +80 V Common-Mode Range

INA193, INA194, INA195
INA196, INA197, INA198
SBOS307G – MAY 2004 – REVISED JANUARY 2015
11 Layout
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11.1 Layout Guidelines
11.1.1 RFI and EMI
Attention to good layout practices 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.
Small ceramic capacitors placed directly across amplifier inputs can reduce RFI/EMI sensitivity. PCB layout
should locate the amplifier as far away as possible from RFI sources. Sources can include other components in
the same system as the amplifier itself, such as inductors (particularly switched inductors handling a lot of current
and at high frequencies). RFI can generally be identified as a variation in offset voltage or DC signal levels with
changes in the interfering RF signal. If the amplifier cannot be located away from sources of radiation, shielding
may be needed. Twisting wire input leads makes them more resistant to RF fields. The difference in input pin
location of the INA193-INA195 devices versus the INA196-INA198 devices may provide different EMI
performance.
11.2 Layout Example
Via to Power or Ground Plane
Via to Internal Layer
Supply Bypass
Capacitor
Output Signal
OUT
V+
GND
IN+
IN-
Supply Voltage
Shunt Resistor
Figure 31. Recommended Layout
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