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| 型號： | MCP6V26-E/MS |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 21/50頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP AUTO-ZERO SGL 8MSOP |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 放大器類型： | 自動調(diào)零 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 1 V/µs |
| 增益帶寬積： | 2MHz |
| 電流 - 輸入偏壓： | 7pA |
| 電壓 - 輸入偏移： | 2µV |
| 電流 - 電源： | 620µA |
| 電流 - 輸出 / 通道： | 22mA |
| 電壓 - 電源，單路/雙路(±)： | 2.3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 管件 |
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MCP6V26/7/8
DS25007B-page 28
2011 Microchip Technology Inc.
4.4.2
RTD SENSOR
The ratiometric circuit in Figure 4-14 conditions a three
wire RTD. It corrects for the sensor’s wiring resistance
by subtracting the voltage across the middle RW. The
top R1 does not change the output voltage; it balances
the op amp inputs. Failure (open) of the RTD is
detected by an out-of-range voltage.
FIGURE 4-14:
RTD Sensor.
The voltages at the input of the ADC can be calculated
with the following:
4.4.3
THERMOCOUPLE SENSOR
Figure 4-15 shows a simplified diagram of an amplifier
and temperature sensor used in a thermocouple
application. The type K thermocouple senses the
temperature at the hot junction (THJ), and produces a
voltage at V1 proportional to THJ (in °C). The amplifier’s
gain is set so that V4/THJ is 10 mV/°C. V3 represents
the output of a temperature sensor, which produces a
voltage proportional to the temperature (in °C) at the
cold junction (TCJ), and with a 0.50V offset. V2 is set so
that V4 is 0.50V when THJ –TCJ is 0°C.
EQUATION 4-3:
FIGURE 4-15:
Thermocouple Sensor;
Simplified Circuit.
Figure 4-16 shows a more complete implementation of
this circuit. The dashed red arrow indicates a thermally
conductive connection between the thermocouple and
the MCP9700A; it needs to be very short and have low
thermal resistance.
FIGURE 4-16:
Thermocouple Sensor.
R3
100 nF
10 nF
R2
R3
100 nF
ADC
VDD
2.49 k
Ω
2.49 k
Ω
10 nF
VDD
RW
RT
RB
RRTD
R1
1F
100
Ω
3k
Ω
3k
Ω
20 k
Ω
20 k
Ω
100 k
Ω
100 k
Ω
2.49 k
Ω
2.49 k
Ω
R2
2.55 k
Ω
2.55 k
Ω
U1A
MCP6V27
U1B
MCP6V27
V
DM
G
RTD VT
V
B
–
() G
WVW
+
=
V
CM
V
T
V
B
G
RTD
1G
W
–
+
()V
W
++
2
------------------------------------------------------------------------------
=
G
RTD
12 R
3 R2
+
=
G
W
G
RTD
R
3 R1
–
=
Where:
VT = Voltage at the top of RRTD
VB = Voltage at the bottom of RRTD
VW = Voltage across top and middle RW’s
VCM = ADC’s common mode input
VDM = ADC’s differential mode input
V1 ≈ THJ(40 V/°C)
V2 = (1.00V)
V3 =TCJ(10 mV/°C) + (0.50V)
V4 =250V1 +(V2 –V3)
≈ (10 mV/°C) (THJ –TCJ)+(0.50V)
(RTH)/250
(RTH)
(RTH)/250
C
(RTH)
C
V4
Type K
40 V/°C
(RTH)
V1
V3
(hot junction
(cold junction
V2
Thermocouple
at THJ)
at TCJ)
RTH = Thevenin Equivalent Resistance
U1
MCP6V26
(RTH)/250
0.5696(RTH)
(RTH)/250
C
(RTH)
C
V4
Type K
(RTH)
4.100(RTH)
V1
Temp.Sensor
VDD
VREF
VDD
3k
Ω
RTH = Thevenin Equivalent Resistance (e.g., 10 kΩ)
U3
MCP6V26
U1
MCP1541
U2
MCP9700A
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