Datasheet

R1
2.5 kΩ
R6
10 kΩ
R8
10 kΩ
R9
40 kΩ
R7
40 kΩ
GND
V A
OUT
V B
OUT
DAC8562
C1
470 nF
XTR111
VIN
REGF
REGS
R2
2.5 kΩ
R3
3 kΩ
R
SET
2.5 kΩ
SET
5.5 V
0 to 5 V
0 to 5 V
A
VDD
IS
VG
Q2
R4
15 Ω
R5
15 Ω
C2
10 nF
I
0- to 20-mA Output
OUT
V
±10-V Output
OUT
24 V
VSP
Q1
V
REFOUT
OPA140
18 V
–18 V
–
+
DAC8562, DAC8563
DAC8162, DAC8163
DAC7562, DAC7563
www.ti.com SLAS719D –AUGUST 2010–REVISED AUGUST 2012
PLC ANALOG OUTPUT MODULE USING THE DAC8562
The DAC8562 can be mated with one of TI's 0- to 20-mA voltage-to-current transmitters to create a low-cost,
programmable current source for use in PLC applications. One specific example includes combining the
DAC8562 with the XTR111 to create a voltage-to-current solution. The DAC output voltage generates a current,
I
SET
, which is determined by the value of the external resistor, R
SET
. This current is internally amplified by 10 and
output at the IS node. A p-channel MOSFET Q1 can be added in an application where a wide compliance
voltage is required, for example, when using a high impedance load. The optional PNP transistor, Q2, along with
the R4 resistor provides external current limiting in a case where the external FET is forced to low impedance.
Additionally, resistors R2 and R3 can be used to scale the 3-V internal regulator to a desired voltage to power
the DAC. Figure 97 shows a working 0- to 20-mA solution using one DAC8562 channel and a ±10-V voltage
output using the other DAC8562 channel. For more information on the ±10-V voltage output circuit see the UP
TO ±15-V BIPOLAR OUTPUT USING THE DAC8562 application.
Figure 97. 0- to 20-mA and ±10-V Outputs Using DAC8562
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