- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄373949 > AD8554ARZ-REEL (ANALOG DEVICES INC) Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers PDF資料下載
參數(shù)資料
| 型號(hào)： | AD8554ARZ-REEL |
| 廠(chǎng)商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers |
| 中文描述： | QUAD OP-AMP, 10 uV OFFSET-MAX, 1.5 MHz BAND WIDTH, PDSO14 |
| 封裝： | ROHS COMPLIANT, MS-012AB, SOIC-14 |
| 文件頁(yè)數(shù)： | 21/24頁(yè) |
| 文件大小： | 416K |
| 代理商： | AD8554ARZ-REEL |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)當(dāng)前第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)
AD8551/AD8552/AD8554
HIGH ACCURACY THERMOCOUPLE AMPLIFIER
Figure 68 shows a K-type thermocouple amplifier configuration
with cold junction compensation. Even from a 5 V supply, the
AD8551 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, R
6
should be adjusted until the
output is at 0 V.
Rev. C | Page 21 of 24
L
1
SENSE
R
2
I
R
R
Output
Monitor
×
×
=
(23)
Using the components shown in Figure 69, the monitor output
transfer function is 2.5 V/A.
Figure 70 shows the low-side monitor equivalent. In this circuit,
the input common-mode voltage to the AD8552 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
R
OUT
V
I
R
R
V
1
2
(24)
Using the values shown in Figure 68, the output voltage tracks
temperature at 10 mV/°C. For a wider range of temperature
measurement, R
9
can be decreased to 62 kΩ. This creates a
5 mV/°C change at the output, allowing measurements of up
to 1000°C.
For the component values shown in Figure 70, the output
transfer function decreases from V+ at 2.5 V/A.
8
1
4
3
3V
V+
G
S
D
2
3V
1/2
AD8552
MONITOR
OUTPUT
M1
Si9433
R
1
100
R
2
2.49k
R
SENSE
0.1
I
L
0.1μF
0
3
2
8
4
5V
REF02EZ
12V
2
6
4
D1
1N4148
5.000V
1
–
AD8551
+
0.1μF
0.1μF
10μF
K-TYPE
THERMOCOUPLE
40.7μV/°C
0V TO 5.00V
(0°C TO 500°C)
R
4
5.62k
R
6
200
R
3
53.6
R
2
2.74k
R
1
10.7k
R
5
40.2k
R
8
124k
R
7
453
0
Figure 69. A High-Side Load Current Monitor
Figure 68. A Precision K-Type Thermocouple Amplifier with
Cold Junction Compensation
V+
1/2 AD8552
V+
Q1
RETURN TO
GROUND
V
OUT
R
2
2.49k
R
1
100
R
SENSE
0.1
0
PRECISION CURRENT METER
Because of its low input bias current and superb offset voltage at
single supply voltages, the AD855x 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 low-side current
monitor. Using both amplifiers in the AD8552 provides a simple
method to monitor both current supply and return paths for
load or fault detection.
Figure 69 shows a high-side current monitor configuration. In
this configuration, 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.
Figure 70. A Low-Side Load Current Monitor
PRECISION VOLTAGE COMPARATOR
The AD855x can be operated open-loop and used as a precision
comparator. The AD855x has less than 50 μV of offset voltage
when run in this configuration. The slight increase of offset
voltage stems from the fact that the autocorrection architecture
operates with 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. Ensure the maximum differential
voltage of the device is not exceeded. For more information,
refer to the Input Overvoltage Protection section.
The 0.1 Ω resistor creates a voltage drop to the noninverting
input of the AD855x. The output of the amplifier is corrected
until this voltage appears at the inverting input. This creates a
current through R
1
, which in turn flows through R
2
. The
monitor output is given by
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8551ARM-R2 | Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers |
| AD8551ARM-REEL | Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers |
| AD8551ARMZ-R2 | Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers |
| AD8551ARMZ-REEL | Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers |
| AD8551AR-REEL | Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8554ARZ-REEL7 | 功能描述:IC OPAMP CHOPPER R-R QUAD 14SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:滿(mǎn)擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
| AD8555 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Zero-Drift, Digitally Programmable Sensor Signal Amplifier |
| AD8555_09 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Zero-Drift, Digitally Programmable Sensor Signal Amplifier |
| AD85551 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:10 MHz, 20 V/レs, G = 1, 10, 100, 1000 i CMOS㈢ Programmable Gain Instrumentation Amplifier |
| AD8555ACP | 制造商:Analog Devices 功能描述:SP AMP CURRENT SENSE AMP SGL R-R I/O 5.5V 16LFCSP EP - Bulk |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。