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| 型号： | AD8497CRMZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC THERMOCOUPLE A W/COMP 8MSOP |
| 标准包装： | 1,000 |
| 类型： | 热电偶放大器 |
| 输入类型： | 差分 |
| 输出类型： | 模拟 |
| 电流 - 电源： | 250µA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
AD8494/AD8495/AD8496/AD8497
Rev. C | Page 15 of 16
SETPOINT CONTROLLER
The AD849x can be used as a temperature setpoint controller,
with a thermocouple input from a remote location or with the
AD849x itself being used as a temperature sensor. When the
measured temperature is below the setpoint temperature, the
output voltage goes to VS. When the measured temperature is
above the setpoint temperature, the output voltage goes to +VS.
For best accuracy and CMRR performance, the setpoint voltage
should be created with a low impedance source. If the setpoint
voltage is generated with a voltage divider, a buffer is
recommended.
AD849x
OUT
SENSE
SETPOINT
VOLTAGE
REF
–VS
+VS
5V
08
52
9-
0
14
COLD JUNCTION
COMPENSATION
2
3
7
6
+IN
THERMO-
COUPLE
–IN
1M
8
1
IN-AMP
5
Figure 35. Setpoint Controller
Hysteresis can be added to the setpoint controller by using a
resistor divider from the output to the reference pin, as shown
in Figure 36. The hysteresis in °C is
C
mV/
5
)
/(
°
+
×
=
R2
R1
V
T
S
HYST
AD849x
OUT
SENSE
SETPOINT
VOLTAGE
R2
100k
R1
1k
R1
1k
REF
–VS
+VS
5V
08529-
015
COLD JUNCTION
COMPENSATION
2
3
7
5
+IN
THERMO-
COUPLE
–IN
1M
8
1
IN-AMP
6
Figure 36. Adding 10 Degrees of Hysteresis
A resistor equivalent to the output resistance of the divider should
be connected to the sense pin to ensure good CMRR.
MEASURING NEGATIVE TEMPERATURES
The AD849x can measure negative temperatures on dual
supplies and on a single supply. When operating on dual
supplies with the reference pin grounded, a negative output
voltage indicates a negative temperature at the thermocouple
measurement junction.
VOUT = (TMJ × 5 mV/°C) + VREF
When operating the AD849x on a single supply, level-shift
the output by applying a positive voltage (less than +VS) on
the reference pin. An output voltage less than VREF indicates
a negative temperature at the thermocouple measurement
junction.
REFERENCE PIN ALLOWS OFFSET ADJUSTMENT
The reference pin can be used to level-shift the AD849x output
voltage. This is useful for measuring negative temperatures on a
single supply and to match the AD849x output voltage range to
the input voltage range of the subsequent electronics in the
signal chain.
The reference pin can also be used to offset any initial calibra-
tion errors. Apply a small reference voltage proportional to the
error to nullify the effect of the calibration error on the output.
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