REF02AZ/883C AD [Analog Devices], REF02AZ/883C Datasheet - Page 10

• Manufacturer Part Number: REF02AZ/883C
• Description: 5 V Precision Voltage Reference/Temperature Transducer
• Manufacturer: AD [Analog Devices]

REF02
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.
Adjustment of the output does not significantly
temperature performance of the device. The temperature
coefficient change is approximately 0.7 ppm/°C for 100 m
output adjustment.
0.1µF
3
TEMP
Figure 14. Output Adjustment Circuit
REF02
3
GND
V
TEMP
IN
TRIM
4
Figure 16. ±5 V Reference
Figure 15. Burn-In Circuit
2
+15V
REF02
V
GND
O
5kΩ
15V
V
IN
4
5
2
6
TRIM
REF02
+18V
–18V
GND
V
V
O
IN
2
4
6
5
10kΩ
10kΩ
OP02
+15V
–15V
10kΩ
OUTPUT
affect the
+5V
–5V
V of
Rev. F | Page 10 of 16
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 V
temperature coefficient is approximately 1.96 mV/°C (see
Figure 18).
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 V
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 ΔV
buffering, even tens of microamps drawn from the TEMP pin
can cause V
V
O
+ =
REF02
850
800
750
700
650
600
550
500
450
400
2
+5V
R
–50
1
4
R
V
SAMPLE SIZE = 6
+ R
TEMP
OUT
1
IN
Figure 18. Voltage at TEMP Pin vs. Temperature
2
= 9V
(V
6
to fall out of specification.
–25
is approximately 550 mV at 25°C, and the
Z PACKAGE AND 833 PRODUCT
REF
V
∆
REF
V
),
TEMP
Figure 17. ±2.5 V Reference
V
O
– =
0
OUT
/
∆
T = 2.1mV/°C
R
TEMPERATURE (°C)
. Care must be taken to buffer the
+2.5V
V
1
R
O
+ R
2
+
25
2
OUT
J, S, AND P PACKAGES
(V
5.6kΩ
R1
REF
) See Figure 19. Without
5.6kΩ
50
)
R2
∆
–2.5V
+V
V
TEMP
O
75
6
/
∆
T = 1.96mV/°C
OP02
–9V
7
4
100
–
+
2
3
125