Texas Instruments INA216 Evaluation Module INA216EVM INA216EVM 데이터 시트
제품 코드
INA216EVM
C2
0.1uF
IN
-
IN
+
+
G
N
D
D
O
U
T
T
OUT
IN+
IN-
GND
R1
R3
0
R4
0
C1
1
2
3
4
5
6
7
8
J1
R2
Burr Brown Products
LOGO2
Burr Brown Products
LOGO1
OUT
IN+
IN-
GND
GND
IN+
IN-
OUT
1
2
3
4
5
6
7
8
9
10
J2
1
2
T1
1
2
T2
IN-
IN+
GND
OUT
U1
INA216
INA216EVM Schematic and PCB Layout
There are several factors to consider when selecting the appropriate device:
•
•
The INA216 devices are identical with the exception of different gain settings.
•
The limiting factor that requires attention to be given to device selection is the output voltage.
•
The output voltage has a restriction: it must remain within the range of 2mV above ground to 300mV
below the supply voltage.
•
The differential input voltage is either applied across the inputs, or developed based on the load
current flowing through the shunt resistor.
•
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.
•
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
smaller gain.
3.6
Voltage Inputs
The V
IN+
and V
IN–
terminals of T1 can accept a differential voltage that is amplified by the selected device
gain and is presented at the V
OUT
terminal of T2. These inputs could also be used to connect the
differential voltage developed across an external shunt in an existing circuit, a differential voltage applied
directly to the V
IN+
and V
IN–
inputs, or by developing a differential voltage across an on-board shunt with
the common-mode voltage and load connected. The common-mode voltage should be connected to the
V
IN+
terminal and the load should be connected to the V
IN–
terminal. The shunt can be installed in R1 or
R2, or the prototype area and wired to the R2 footprint.
4
INA216EVM Schematic and PCB Layout
4.1
Schematic
illustrates the INA216EVM schematic.
Figure 11. INA216EVM Schematic
10
INA216EVM
SBOU086–August 2011
Copyright © 2011, Texas Instruments Incorporated