APPLICATIONS INFORMATION
Figure 1 shows the basic connections required for 0V to 10V
input and 4ma to 20mA output. Other input voltage and
output current ranges require changes in connections of pins
3, 4, 5, 9 and 10 as shown in the table of Figure 1.
The complete transfer function of the XTR110 is:
10
I
O
=
(V
REF IN
)
16
+
(V
IN1
)
4
R
SPAN
+
(V
IN2
)
2
(1)
have a voltage rating equal or greater than the maximum
power supply voltage. Various recommended types are shown
in Table I.
MANUFACTURER
Ferranti
PART NO.
ZVP1304A
ZVP1304B
ZVP1306A
ZVP1306B
IRF9513
MTP8P08
RFL1P08
RFT2P08
VP0300B
VP0300L
VP0300M
VP0808B
VP0808L
VP0808M
VP1304N2
VP1304N3
VP1306N2
VP1306N3
BV
DSS(1)
40V
40V
60V
60V
60V
80V
80V
80V
30V
30V
30V
80V
80V
80V
40V
40V
60V
60V
BV
GS(1)
20V
20V
20V
20V
20V
20V
20V
20V
40V
40V
40V
40V
40V
40V
20V
20V
20V
20V
PACKAGE
TO-92
TO-39
TO-92
TO-39
TO-220
TO-220
TO-39
TO-220
TO-39
TO-92
TO-237
TO-39
TO-92
TO-237
TO-220
TO-92
TO-220
TO-92
International
Rectifier
Motorola
RCA
R
SPAN
is the total impedance seen at the emitter of the
internal NPN transistor. This impedance varies depending
on how pins 8, 9 and 10 are configured. Typical operating
region configurations are shown in Figure 1. An external
R
SPAN
can be connected for different output current ranges
as described later.
EXTERNAL TRANSISTOR
An external pass transistor, Q
EXT
, is required as shown in
Figure 1. This transistor conducts the output signal current.
A P-channel MOSFET transistor is recommended. It must
Siliconix
(preferred)
Supertex
NOTE: (1) BV
DSS
—Drain-source breakdown voltage. BV
GS
—Gate-source
breakdown voltage.
TABLE I. Available P-Channel MOSFETs.
+V
CC
Force 15
Sense 12
V
REF
Adj.
11
4
V
IN
0 to 10V
I
O
/10
3
R
1
15kΩ
R
5
16.25kΩ
7
R
3
20kΩ
R
4
10kΩ
8
I
O
/10
R
7
6250Ω
10
9
R
6
1562.5Ω
6
R
9
50Ω
+10V
Reference
R
8
500Ω
16
1
13
14
+
1µF
+V
CC
13.5 to 40V
I
O
Short
Connection
(see text)
Q
EXT
P-Channel
MOSFET
(see text)
I
O
4 to 20mA
R
L
(250Ω typ)
Span Adjust
4mA Span
16mA Span
Zero
Adjust
R
2
5kΩ
5
2
INPUT
OUTPUT
RANGE (V) RANGE (mA)
0-10
2-10
0-10
0-10
0-5
1-5
0-5
0-5
0-20
4-20
4-20
5-25
0-20
4-20
4-20
5-25
PIN 3
Com
Com
+10V Ref
+10V Ref
Com
Com
+10V Ref
+10V Ref
PIN 4
Input
Input
Input
Input
Com
Com
Com
Com
PIN 5
Com
Com
Com
Com
Input
Input
Input
Input
PIN 9
Com
Com
Com
Com
Com
Com
Com
Com
PIN 10
Com
Com
Open
Com
Com
Com
Open
Com
FIGURE 1. Basic Circuit Connection.
6
XTR110
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TI [ TEXAS INSTRUMENTS ]
