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參數(shù)資料
| 型號(hào)： | REF02CPZ2 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 5 V Precision Voltage Reference/Temperature Transducer |
| 中文描述： | 5 V精密電壓參考/溫度傳感器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 261K |
| 代理商： | REF02CPZ2 |
REF02
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
TEMP
is
approximately 550 mV at 25°C, and the temperature coefficient
is approximately 1.96 mV/°C (see Figure 18).
Rev. I | Page 11 of 16
850
800
750
700
650
600
550
500
450
400
–50
–25
0
25
50
75
100
125
0
TEMPERATURE (
°
C)
T
V
TEMP
/
T = 1.96mV/
°
C
V
= 9V
SAMPLE SIZE = 6
J, S, AND P PACKAGES
Z PACKAGE AND 833 PRODUCT
V
TEMP
/
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 has a
significant effect on V
OUT
. Care must be taken to buffer the
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
OUT
(see
Figure 19). Without buffering, even tens of microamps drawn
from the TEMP pin can cause V
OUT
to fall out of specification.
0
TEMP
TRIM
GND
U1
OP1177
V–
V+
15V
U2
V
O
V
OUT
V
IN
V
1.9mV/
°
C
V
IN
REF02
Figure 19. Temperature Monitoring
0
GND
REF02
4
6
2
TEMP3
CMP02
–
2
3
8
4
R6
1
7
R7
(9R1
)
(1R3
)
R2
1.5k
R4
2.7k
R5
2.2k
V+
V–
+
HEATING
ELEMENT
V+ (12V TO 32V)
V
IN
V
O
(SEE NOTE 1)
NTO SUBSTANCE BEING HEATED.
2. SETPOINT TEMPERATURE OF 60
°
C.
3. R3 = R1
||
R2
||
R6
Figure 20. Temperature Controller
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
B
)
provides a path for the supply current (I
SY
) of the 15.00 V
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).
0
GND
REF02
GND
REF02
GND
REF02
TRIM
TRIM
10k
10k
R
B
6.8k
10k
2
6
5
4
2
6
5
4
2
6
5
4
15V
10V
5V
TRIM
27V TO 55V
V
IN
V
O
V
IN
V
O
V
IN
V
O
Figure 21. Reference Stack
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參數(shù)描述 |
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| REF02CPZKL1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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| REF02CSA+ | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 5V Precision Voltage Reference RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
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