参数资料
| 型号： | AD8572ARUZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP CHOPPER R-R DUAL 8TSSOP |
| 标准包装： | 96 |
| 放大器类型： | 断路器（零漂移） |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.4 V/µs |
| 增益带宽积： | 1.5MHz |
| 电流 - 输入偏压： | 10pA |
| 电压 - 输入偏移： | 1µV |
| 电流 - 电源： | 850µA |
| 电流 - 输出 / 通道： | 30mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-TSSOP |
| 包装： | 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8572ARUZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers |
| AD8572ARUZ-REEL | 功能描述:IC OPAMP CHOPPER R-R DUAL 8TSSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| AD8572ARZ | 功能描述:IC OPAMP CHOPPER R-R DUAL 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8572ARZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers |
| AD8572ARZ-REEL | 功能描述:IC OPAMP CHOPPER R-R DUAL 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
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