REF02HS Analog Devices Inc, REF02HS Datasheet - Page 11

• Manufacturer Part Number: REF02HS
• Description: IC PREC VOLT REFERENCE 5V 8-SOIC
• Manufacturer: Analog Devices Inc

Specifications of REF02HS

• Rohs Status: RoHS non-compliant
• Reference Type: Series
• Voltage - Output: 5V
• Tolerance: ±0.07%
• Temperature Coefficient: 25ppm/°C
• Voltage - Input: 7 ~ 40 V
• Number Of Channels: 1
• Current - Quiescent: 1.4mA
• Current - Output: 10mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Current - Cathode: -

TEMPERATURE MONITORING
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
approximately 550 mV at 25°C, and the 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 has a
significant effect on V
TEMP output with a suitable low bias current op amp, such as
the AD8601, AD820, or OP1177. Using any of these three op
amps results in less than a 100 µV change in ΔV
Figure 19). Without buffering, even tens of microamps drawn
from the TEMP pin can cause V
850
800
750
700
650
600
550
500
450
400
1.9mV/°C
–50
V
TEMP
V
SAMPLE SIZE = 6
IN
Figure 18. Voltage at TEMP Pin vs. Temperature
= 9V
–25
Z PACKAGE AND 833 PRODUCT
Figure 19. Temperature Monitoring
∆
V
TEMP
U2
OUT
0
/
OP1177
∆
. Care must be taken to buffer the
T = 2.1mV/°C
15V
TEMPERATURE (°C)
V+
V–
25
J, S, AND P PACKAGES
OUT
V
IN
to fall out of specification.
50
∆
V
V
TEMP
TEMP
IN
REF02
GND
75
U1
/
∆
T = 1.96mV/°C
V
TRIM
OUT
OUT
100
TEMP
(see
V
O
is
125
Rev. I | Page 11 of 16
REFERENCE STACK WITH EXCELLENT LINE
REGULATION
Two REF01s and one REF02 can be stacked to yield 5.00 V,
15.00 V, and 25.00 V outputs. An additional advantage is near-
perfect line regulation of the 5.0 V and 15.0 V output. A 27 V to
55 V input change produces an output change that is less than
the noise voltage of the devices. A load bypass resistor (R
provides a path for the supply current (I
regulator.
In general, any number of REF01s and REF02s can be stacked
this way. For example, 10 devices yield 10 outputs in 5 V or 10 V
steps. The line voltage can change from 100 V to 130 V. Care
must be taken, however, to ensure that the total load currents
do not exceed the maximum usable current (typically 21 mA).
NOTES
1. REF02 SHOULD BE THERMALLY CONNECTED
2. NUMBERS IN PARENTHESES ARE FOR A
3. R3 = R1 || R2 || R6
ELEMENT
HEATING
TO SUBSTANCE BEING HEATED.
SETPOINT TEMPERATURE OF 60°C.
27V TO 55V
REF02
REF02
GND
GND
V
V
IN
IN
2
TRIM
4
2
4
TRIM
(SEE NOTE 1)
V
V
O
O
6
5
6
5
2.2kΩ
V+ (12V TO 32V)
Figure 20. Temperature Controller
R5
REF02
Figure 21. Reference Stack
GND
V
IN
TEMP
2
4
V
O
6
3
REF02
GND
V
IN
TRIM
2
4
10kΩ
(9.2kΩ)
(1.3kΩ)
V
R1
R3
O
6
5
1.5kΩ
2.7kΩ
SY
R2
R4
R6
) of the 15.00 V
2
3
+
CMP02
–
1
V+
10kΩ
10kΩ
R
6.8kΩ
8
B
10V
15V
V–
5V
4
REF02
7
B
)
R7
27kΩ