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参数资料
| 型号： | REF02CS |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES PREC 5V 8-SOIC |
| 产品变化通告： | Input Voltage Max Change 23/Mar/2009 Product Discontinuance 27/Oct/2011 |
| 标准包装： | 98 |
| 基准类型： | 串联，精度 |
| 输出电压： | 5V |
| 容差： | ±0.45% |
| 温度系数： | 65ppm/°C |
| 输入电压： | 7 V ~ 40 V |
| 通道数： | 1 |
| 电流 - 静态： | 1.6mA |
| 电流 - 输出： | 10mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 管件 |
REF02
TEMPERATURE MONITORING
The REF02 provides a TEMP output (Pin 3) that varies linearly
with temperature. This output can be used to monitor the
V+ (12V TO 32V)
R7
27k ?
8
+
temperature change in the system. The voltage at V TEMP is
approximately 550 mV at 25°C, and the temperature coefficient
HEATING
ELEMENT
2
V IN
V O
REF02
TEMP
6
3
R1
(9.2k ? )
R3
(1.3k ? )
R6
2
V+
CMP02 V–
3 – 4
7
(SEE NOTE 1)
850
800
V IN = 9V
SAMPLE SIZE = 6
GND
4
R2
1.5k ?
1
750
R4
700
650
600
550
500
450
Z PACKAGE AND 833 PRODUCT
? V TEMP / ? T = 2.1mV/ ° C
? V TEMP / ? T = 1.96mV/ ° C
J, S, AND P PACKAGES
R5
2.2k ? 2.7k ?
NOTES
1. REF02 SHOULD BE THERMALLY CONNECTED
TO SUBSTANCE BEING HEATED.
2. NUMBERS IN PARENTHESES ARE FOR A
SETPOINT TEMPERATURE OF 60 ° C.
3. R3 = R1 || R2 || R6
Figure 20. Temperature Controller
REFERENCE STACK WITH EXCELLENT LINE
REGULATION
400
–50
–25
0
25
50
75
100
125
Two REF01s and one REF02 can be stacked to yield 5.00 V,
TEMPERATURE ( ° 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
from the TEMP pin can cause V OUT to fall out of specification.
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).
27V TO 55V
2
U1
V IN
V O
6
15V
15V
REF02
REF02
V IN
V IN
V OUT
V O
TRIM
5
10k ?
V TEMP
1.9mV/ ° C
U2
V+
OP1177
V–
TEMP
TRIM
GND
GND
4
2
V IN
V O
6
10V
Figure 19. Temperature Monitoring
REF02
2
TRIM
GND
5
10k ?
V IN
V O
6
4
5V
REF02
TRIM
5
10k ?
R B
6.8k ?
GND
4
Figure 21. Reference Stack
Rev. I | Page 11 of 16
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