Datasheet
REV. C
REF02
–8–
OUTPUT ADJUSTMENT
The REF02 trim terminal can be used to adjust the output
voltage over a 5 V ± 300 mV range. This feature allows the sys-
tem designer to trim system errors by setting the reference to a
voltage other than 5 V. Of course, the output can also be set to
exactly 5.000 V, or to 5.12 V for binary applications.
15V
V
IN
GND
TRIM
V
O
REF02
2
6
5
4
OUTPUT
10k⍀
3
TEMP
Figure 2. Output Adjustment Circuit
Adjustment of the output does not significantly affect the tem-
perature performance of the device. The temperature coefficient
change is approximately 0.7 ppm/∞C for 100 mV of output
adjustment.
–18V
+18V
V
IN
GND
REF02
4
2
Figure 3. Burn-In Circuit
V
IN
GND
REF02
V
O
TRIM
0.1F
5k⍀
10k⍀
10k⍀
+15V
–15V
+15V
+5V
–5V
4
5
6
2
OP02
3
TEMP
Figure 4.
±
5 V Reference
REF02
R1
5.6k⍀
2
+5V
4
6
2
V
O
+
+2.5V
R2
5.6k⍀
OP02
–
+
V
REF
3
4
6
7
+V
O
–2.5V
–9V
V
O
+
=
R
1
R
1
+ R
2
(V
REF
),
V
O
–
=
R
2
R
1
+ R
2
(V
REF
)
Figure 5.
±
2.5 V Reference
R
S
1.5k⍀, ⴞ5%
OP02
V
IN
GND
REF02
V
O
TRIM
0.1F
R
P
50k⍀
4
5
6
2
V
REF
TEMP
3
*
UP TO 10 FEET OF SHIELDED
4-CONDUCTOR CABLE
R
B1
2
3
7
4
R
BP
V
OUT
+15V
–15V
R
C
R
A
6
Figure 6. Precision Temperature Transducer with
Remote Sensor
Table I. Resistor Values
TCV
OUT
SLOPE(S) 10 mV/∞C 100 mV/∞C 10 mV/∞F
Temperature –55∞C to –55∞C to –67∞F to
Range +125∞C +125∞C +2.57∞C
Output Voltage –0.55 V to –5.5 V to –0.67 V to
Range +1.25 V +12.5 V* +2.57 V
Zero Scale 0 V @ 0∞C0 V @ 0∞C0 V @ 0∞F
R
A
(± 1% resistor) 9.09 kW 15 kW 7.5 kW
R
B1
(± 1% resistor) 1.5 kW 1.82 kW 1.21 kW
R
BP
(Potentiometer) 200 W 500 W 200 W
R
C
(± 1% resistor) 5.11 kW 84.5 kW 8.25 kW
*For 125∞C operation, the op amp output must be able to swing to 12.5 V,
increase V
IN
to 18 V from 15 V if this is a problem.
TEMPERATURE – ⴗC
TEMP VOLTAGE OUTPUT – mA
880
–60 –40 –20 140020406080100 120
V
IN
= 15V
830
780
730
680
630
580
530
480
430
Figure 7. Typical Temperature Voltage Output vs.
Temperature (REF02A)