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| 型號(hào)： | AD8571ARMZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP CHOPPER R-R 30MA 8MSOP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 放大器類型： | 斷路器（零漂移） |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 0.4 V/µs |
| 增益帶寬積： | 1.5MHz |
| 電流 - 輸入偏壓： | 10pA |
| 電壓 - 輸入偏移： | 1µV |
| 電流 - 電源： | 850µA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 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 |
AD8571/AD8572/AD8574
Rev. E | Page 21 of 24
HIGH ACCURACY THERMOCOUPLE AMPLIFIER
Figure 66 shows a K-type thermocouple amplifier configuration
with cold-junction compensation. Even from a 5 V supply, the
AD8571 can provide enough accuracy to achieve a resolution of
better than 0.02°C from 0°C to 500°C. D1 is used as a tempera-
ture measuring device to correct the cold-junction error from
the thermocouple and should be placed as close as possible to
the two terminating junctions. With the thermocouple measuring
tip immersed in a 0°C ice bath, R6 should be adjusted until the
output is at 0 V.
Using the values shown in Figure 66, the output voltage tracks
temperature at 10 mV/°C. For a wider range of temperature
measurement, R9 can be decreased to 62 kΩ. This creates a
5 mV/°C change at the output, allowing measurements of up
to 1000°C.
AD8571
3
7
4
0V TO 5V
(0°C TO 500°C)
5V
0.1F
10F
REF02EZ
0.1F
12V
2
6
4
+
–
+
–
D1
1N4148
5V
K-TYPE
THERMOCOUPLE
40.7V/°C
6
2
R2
2.74k
R6
200
R3
53.6
R4
5.62k
R1
10.7k
R5
40.2k
R9
124k
R8
453
+
01
10
4-
06
6
Figure 66. Precision K-Type Thermocouple Amplifier
with Cold-Junction Compensation
PRECISION CURRENT METER
Because of its low input bias current and superb offset voltage at
single-supply voltages, the AD857x family is an excellent amplifier
for precision current monitoring. Its rail-to-rail input allows the
amplifier to be used as either a high-side or a low-side current
monitor. Using both amplifiers in the AD8572 provides a simple
method to monitor both current supply and return paths for
load or fault detection.
Figure 67 shows a high-side current monitor configuration.
Here, the input common-mode voltage of the amplifier is at or
near the positive supply voltage. The rail-to-rail input of the
amplifier provides a precise measurement, even with the input
common-mode voltage at the supply voltage. The CMOS input
structure does not draw any input bias current, ensuring a
minimum of measurement error.
The 0.1 Ω resistor creates a voltage drop to the noninverting
input of the AD857x. The output of the amplifier is corrected
until this voltage appears at the inverting input, which creates a
current through R1 that in turn flows through R2. The monitor
output is given by
Monitor Output = R2 × (RSENSE/R1) × IL
(23)
Using the components shown in Figure 67, the monitor output
transfer function is 2.49 V/A.
8
1
4
3
V+
0.1F
IL
G
S
D
2
M1
Si9433
MONITOR
OUTPUT
V+
1/2
AD8572
R1
100
R2
2.49k
RSENSE
0.1
01
10
4-
06
7
LOAD
+
–
Figure 67. High-Side Load Current Monitor
Figure 68 shows the low-side monitor equivalent. In this circuit,
the input common-mode voltage to the AD8572 is at or near
ground. Again, a 0.1 Ω resistor provides a voltage drop propor-
tional to the return current. The output voltage is given as
×
=
+
L
SENSE
I
R
V
Output
Monitor
1
2
(24)
For the component values shown in Figure 68, the monitor
output transfer function is V+ 2.49 V/A.
01
10
4-
06
8
V+
2
3
1/2 AD8572
V+
MONITOR
OUTPUT
Q1
RSENSE
0.1
R1
100
R2
2.49k
IL
LOAD
V+
Figure 68. Low-Side Load Current Monitor
PRECISION VOLTAGE COMPARATOR
The AD857x can be operated open loop and used as a precision
comparator. The AD857x have less than 50 μV of offset voltage
when they run in this configuration. The slight increase of
offset voltage stems from the fact that the autocorrection
architecture operates with the lowest offset in a closed-loop
configuration, that is, one with negative feedback. With 50 mV
of overdrive, the device has a propagation delay of 15 μs on the
rising edge and 8 μs on the falling edge.
Care should be taken to ensure that the maximum differential
voltage of the device is not exceeded. For more information, see
the Input Overvoltage Protection section.
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