IN
IN
REF
OUT
SET
OS
V
V
V
I
10
R
R
æ
ö
-
=
+
ç
÷
è
ø
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Basic EVM Configuration
Figure 7. XTR300EVM Single-Ended Current Output Configuration Screenshot
3.2.2
Bidirectional Output
The second current output configuration creates a bidirectional output from a single-ended input. The
jumper settings for this configuration are listed in
Table 7
. Connect your load to TB4 between OUT+ and
OUT–. Apply ±15 V to V+ and V–. Connect a 5-V signal to V
IN
. Connect a 5-V reference to V
REF
. If there is
no reference voltage, connect J7 to apply an onboard reference voltage of 5 V. Measure the current
though the load by attaching your DMM between OUT– and GND. The current though the load is
approximately 20 mA. Apply a 0-V signal to V
IN
and measure the current though the load; it is
approximately –20 mA. The output current is calculated by the transfer function in
Equation 4
:
(4)
The default EVM configuration sets R
SET
to 2.5 k
Ω
and R
OS
to 2.5 k
Ω
.
Table 7. Bidirectional Current Output Jumper Settings
Jumper
Function
J1
On
J2
On
J3
On
J4
Off
J5
On
J6
On
J7
Off or on
(1)
(1)
J7 should be off if an external reference is used and on if the internal
reference is to be used.
9
SBOU034A – February 2006 – Revised February 2013
XTR300EVM
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