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| 型號： | AMP04EPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/16頁 |
| 文件大小： | 0K |
| 描述： | IC AMP INST PREC 30MA LP 8DIP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| -3db帶寬： | 700kHz |
| 電流 - 輸入偏壓： | 22nA |
| 電壓 - 輸入偏移： | 30µV |
| 電流 - 電源： | 750µA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 5 V ~ 30 V，±2.5 V ~ 15 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 8-PDIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 771 (CN2011-ZH PDF) |
AMP04
REV. B
–10–
APPLICATION CIRCUITS
Low Power Precision Single Supply RTD Amplifier
Figure 11 shows a linearized RTD amplifier that is powered
from a single 5 volt supply. However, the circuit will work up to
36 volts without modification. The RTD is excited by a 100
A
constant current that is regulated by amplifier A (OP295). The
0.202 volts reference voltage used to generate the constant current
is divided down from the 2.500 volt reference. The AMP04 ampli-
fies the bridge output to a 10 mV/
°C output coefficient.
R10
100
R2
26.7k
RSENSE
1k
VOUT
FULL-SCALE
ADJ
0
4.00V
(0 C TO 400 C)
LINEARITY
ADJ.
(@1/2 FS)
NOTES: ALL RESISTORS
0.5%,
25 PPM/ C
ALL POTENTIOMETERS
25 PPM/ C
AMP04
R8
383
R9
50
C1
0.47 F
1
7
3
2
4
5
8
6
1/2
OP295
1/2
OP295
R1
26.7k
500
R4
100
R6
11.5k
R5
1.02k
OUT
REF43
IN
GND
2.5V
R7
121k
50k
4
5
6
8
7
5V
2
5V
C2
0.1 F
C3
0.1 F
RTD
100
0.202V
6
4
1
2
3
R3
BALANCE
5V
A
B
Figure 11. Precision Single Supply RTD Thermometer
Amplifier
The RTD is linearized by feeding a portion of the signal back to
the reference circuit, increasing the reference voltage as the
temperature increases. When calibrated properly, the RTD’s
nonlinearity error will be canceled.
To calibrate, either immerse the RTD into a zero-degree ice
bath or substitute an exact 100
resistor in place of the RTD.
Then adjust bridge BALANCE potentiometer R3 for a 0 volt
output. Note that a 0 volt output is also the negative output swing
limit of the AMP04 powered with a single supply. Therefore, be
sure to adjust R3 to first cause the output to swing positive and
then back off until the output just stops swinging negatively.
Next, set the LINEARITY ADJ potentiometer to the midrange.
Substitute an exact 247.04
resistor (equivalent to 400°C
temperature) in place of the RTD. Adjust the FULL-SCALE
potentiometer for a 4.000 volts output.
Finally substitute a 175.84
resistor (equivalent to 200°C
temperature), and adjust the LINEARITY ADJ potentiometer
for a 2.000 volts at the output. Repeat the full-scale and the
half-scale adjustments as needed.
When properly calibrated, the circuit achieves better than
±0.5°C accuracy within a temperature measurement range
from 0
°C to 400°C.
Precision 4-20 mA Loop Transmitter with Noninteractive Trim
Figure 12 shows a full bridge strain gage transducer amplifier
circuit that is powered off the 4-20 mA current loop. The AMP04
amplifies the bridge signal differentially and is converted to a
current by the output amplifier. The total quiescent current
drawn by the circuit, which includes the bridge, the amplifiers,
and the resistor biasing, is only a fraction of the 4 mA null
current that flows through the current-sense resistor RSENSE.
The voltage across RSENSE feeds back to the OP90’s input,
whose common-mode is fixed at the current summing reference
voltage, thus regulating the output current.
With no bridge signal, the 4 mA null is simply set up by the
50 k
NULL potentiometer plus the 976 k resistors that
inject an offset that forces an 80 mV drop across RSENSE. At a
50 mV full-scale bridge voltage, the AMP04 amplifies the
voltage-to-current converter for a full-scale of 20 mA at the
output. Since the OP90’s input operates at a constant 0 volt
common-mode voltage, the null and the span adjustments do
not interact with one another. Calibration is simple and easy
with the NULL adjusted first, followed by SPAN adjust. The
entire circuit can be remotely placed, and powered from the
4-20 mA 2-wire loop.
RSENSE
20
U1
AMP04
5k
10-TURN
2.49k
1
7
3
2
4
5
8
6
U2
OP90
50mV
FS
0.22 F
97.6k
3
2
B
976k
50k
HP
5082-2810
220pF
4
6
100k
5%
2k
5%
T1P29A
0.1 F
5.00V
OUT
REF02
N
GND
U3
1N4002
4mA NULL
13.3k
15.8k
3500
STRAIN
GAGE BRIDGE
7
20mA
SPAN
6
2
4
+VS
12V TO 36V
RLOAD
100
4-20mA
INULL + ISPAN
UNLESS OTHERWISE SPECIFIED, ALL RESISTORS
1%
OR BETTER POTENTIOMETER < 50 PPM/ C
Figure 12. Precision 4-20 mA Loop Transmitter Features Noninteractive Trims
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AMP04EPZ | 制造商:Analog Devices 功能描述:Instrumentation Amplifier |
| AMP04ES | 功能描述:IC AMP INST PREC 30MA LP 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:帶卷 (TR) |
| AMP04ES-REEL7 | 制造商:Analog Devices 功能描述:SP Amp INSTR Amp Single ±15V/30V 8-Pin SOIC T/R |
| AMP04ESZ | 功能描述:IC AMP INST PREC 30MA LP 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AMP04ESZ | 制造商:Analog Devices 功能描述:IC, INSTRUMENT AMP, 700KHZ, 85DB, SOIC-8 |
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