Texas Instruments NA210-214EVM, User Manual

Page: 9 / 16

3.3 R3, R4, C1
3.4 Bypass Capacitors and Jumpers
3.5 U1
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INA210-214EVM Circuit
R3 and R4 are factory-installed 0
Ω
resistors. These resistors, in combination with C1, form an input filter.
These locations allow for both through-hole and surface-mount packages that range in size from 0603 to
1206. Additional information regarding the use of input filtering is provided in the
INA210-214 product data
sheet .
C2 and C3 are 0.1
µ
F supply bypass capacitors.
J1 is intended to be used as measurements points of R1, if necessary.
J2 is used as a test port at the factory but can be used for the corresponding input and output pins, if
desired.
U1 is the location for the test device. Five device boards are supplied with the INA210-214EVM board.
Each board is populated with one of the available device gains. This interchangeable option allows users
to test the devices and determine the gain setting that is best suited for a given application.
Here is a list of the factors involved in selecting the appropriate device.
•
The INA210-214 devices are identical with the exception of different gain settings.
•
The differential input voltage is either applied across the inputs or developed based on the load current
that flows through the shunt resistor.
•
The limiting factor that requires attention to be given to device selection is the output voltage.
•
The selected device must allow the output voltage to remain within the acceptable range after the
developed input voltage is amplified by the respective device gain. The output voltage must remain
with the range of 50mV above ground to 200mV below the supply voltage.
•
An output below the minimum allowable output requires the selection of a device with a higher gain.
Likewise, an output above the maximum allowable output requires the selection of a device with a
lower gain.
In addition to being able to accommodate the device boards, a surface-mount footprint is also included so
the user can install one of these devices directly onto the board, if desired.
Figure 9 illustrates the U1
footprint on the EVM. Figure 10 shows the U1 slot populated with a DIP board device.
SBOU065 – August 2008 INA210-214EVM User's Guide 9
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