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REF02 Datasheet(PDF) 10 Page - Analog Devices

Part # REF02
Description  5 V Precision Voltage Reference/Temperature Transducer
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

REF02 Datasheet(HTML) 10 Page - Analog Devices

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REF02
Rev. F | Page 10 of 16
OUTPUT ADJUSTMENT
The REF02 trim terminal can be used to adjust the output
voltage over a 5 V ±300 mV range. This feature lets the system
designer trim system errors by setting the reference to a voltage
other than 5 V. The output also can be set to exactly 5.000 V or
to 5.12 V for binary applications.
VIN
GND
TRIM
TEMP
VO
REF02
15V
3
2
6
5
4
OUTPUT
10k
Figure 14. Output Adjustment Circuit
Adjustment of the output does not significantly affect the
temperature performance of the device. The temperature
coefficient change is approximately 0.7 ppm/°C for 100 m
V of
output adjustment.
VIN
GND
–18V
+18V
4
2
REF02
Figure 15. Burn-In Circuit
VIN
GND
REF02
VO
TRIM
TEMP
0.1
µF
5k
OP02
10k
10k
+15V
–15V
+15V
+5V
–5V
4
5
3
6
2
Figure 16. ±5 V Reference
REF02
R1
5.6k
R2
5.6k
2
+5V
4
6
2
OP02
+
3
4
6
7
–9V
VREF
VO+
+2.5V
+VO
–2.5V
VO+ =
(VREF),
R1
R1 + R2
VO– =
(VREF)
R2
R1 + R2
Figure 17. ±2.5 V Reference
TEMPERATURE MONITORING
As described previously, the REF02 provides a TEMP output
(Pin 3) that varies linearly with temperature. This output can be
used to monitor the temperature change in the system. The
voltage at VTEMP is approximately 550 mV at 25°C, and the
temperature coefficient is approximately 1.96 mV/°C (see
Figure 18).
850
800
750
700
650
600
550
500
450
400
–50
–25
0
25
50
75
100
125
TEMPERATURE (
°C)
VTEMP/T = 1.96mV/°C
VIN = 9V
SAMPLE SIZE = 6
J, S, AND P PACKAGES
Z PACKAGE AND 833 PRODUCT
VTEMP/T = 2.1mV/°C
Figure 18. Voltage at TEMP Pin vs. Temperature
A voltage change of 39.2 mV at the TEMP pin corresponds to a
20°C change in temperature.
The TEMP function is provided as a convenience rather than a
precise feature. Since the voltage at the TEMP node is acquired
from the band gap core, current pulling from this pin will have
a significant effect on VOUT. Care must be taken to buffer the
TEMP output with a suitable low bias current op amp, such as
the AD8601, AD820, or OP1177 (all of which would result in
less than a 100 V change in ΔVOUT) See Figure 19. Without
buffering, even tens of microamps drawn from the TEMP pin
can cause VOUT to fall out of specification.


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