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參數(shù)資料
| 型號： | AD620BR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Precision Instrumentation Amplifier |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 85 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO8 |
| 封裝： | MS-021-AA, SOIC-8 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 571K |
| 代理商： | AD620BR |
AD620
REV. E
–11–
Make vs. Buy: A Typical Bridge Application Error Budget
The AD620 offers improved performance over “homebrew”
three op amp IA designs, along with smaller size, fewer compo-
nents and 10
×
lower supply current. In the typical application,
shown in Figure 34, a gain of 100 is required to amplify a bridge
output of 20 mV full scale over the industrial temperature range
of –40
°
C to +85
°
C. The error budget table below shows how to
calculate the effect various error sources have on circuit accuracy.
Regardless of the system in which it is being used, the AD620
provides greater accuracy, and at low power and price. In simple
R = 350
V
+10V
PRECISION BRIDGE TRANSDUCER
AD620A MONOLITHIC
INSTRUMENTATION
AMPLIFIER, G = 100
“HOMEBREW” IN-AMP, G = 100
*0.02% RESISTOR MATCH, 3PPM/
8
C TRACKING
**DISCRETE 1% RESISTOR, 100PPM/
8
C TRACKING
SUPPLY CURRENT = 15mA MAX
100
V
**
10k
V
*
10k
V
**
10k
V
*
10k
V
*
10k
V
**
10k
V
*
SUPPLY CURRENT = 1.3mA MAX
OP07D
OP07D
OP07D
AD620A
R
G
499
V
REFERENCE
R = 350
V
R = 350
V
R = 350
V
Figure 34. Make vs. Buy
Table I. Make vs. Buy Error Budget
AD620 Circuit
Calculation
“Homebrew” Circuit
Calculation
Error, ppm of Full Scale
AD620
Error Source
Homebrew
ABSOLUTE ACCURACY at T
A
= +25
°
C
Input Offset Voltage,
μ
V
Output Offset Voltage,
μ
V
Input Offset Current, nA
CMR, dB
125
μ
V/20 mV
1000
μ
V/100/20 mV
2 nA
×
350
/20 mV
110 dB
→
3.16 ppm,
×
5 V/20 mV
(150
μ
V
×
√
2
)/20 mV
((150
μ
V
×
2)/100)/20 mV
(6 nA
×
350
)/20 mV
(0.02% Match
×
5 V)/20 mV/100
1
6,250
14,
500
14,1
18
14,
791
10,607
10,
150
14,1
53
10,
500
Total Absolute Error
1
7,558
11,310
DRIFT TO +85
°
C
Gain Drift, ppm/
°
C
Input Offset Voltage Drift,
μ
V/
°
C
Output Offset Voltage Drift,
μ
V/
°
C
(50 ppm + 10 ppm)
×
60
°
C
1
μ
V/
°
C
×
60
°
C/20 mV
15
μ
V/
°
C
×
60
°
C/100/20 mV
100 ppm/
°
C Track
×
60
°
C
(2.5
μ
V/
°
C
×
√
2
×
60
°
C)/20 mV
(2.5
μ
V/
°
C
×
2
×
60
°
C)/100/20 mV
1
3,600
1
3,000
14,
450
1
6,000
10,607
10,
150
Total Drift Error
1
7,050
16,757
RESOLUTION
Gain Nonlinearity, ppm of Full Scale
Typ 0.1 Hz–10 Hz Voltage Noise,
μ
V p-p 0.28
μ
V p-p/20 mV
40 ppm
40 ppm
(0.38
μ
V p-p
×
√
2
)/20 mV
14,1
40
141,
14
10,1
40
13,1
27
Total Resolution Error
14,1
54
101,
67
Grand Total Error
14,662
28,134
G = 100, V
S
=
±
15 V.
(All errors are min/max and referred to input.)
systems, absolute accuracy and drift errors are by far the most
significant contributors to error. In more complex systems with
an intelligent processor, an autogain/autozero cycle will remove all
absolute accuracy and drift errors leaving only the resolution
errors of gain nonlinearity and noise, thus allowing full 14-bit
accuracy.
Note that for the homebrew circuit, the OP07 specifications for
input voltage offset and noise have been multiplied by
√
2
. This
is because a three op amp type in-amp has two op amps at its
inputs, both contributing to the overall input error.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD620BR | 制造商:Analog Devices 功能描述:SEMICONDUCTORSLINEAR |
| AD620BR-REEL | 功能描述:IC AMP INST LP LN 18MA 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:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 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-SOIC 包裝:帶卷 (TR) |
| AD620BR-REEL7 | 功能描述:IC AMP INST LP LN 18MA 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°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 |
| AD620BRZ | 功能描述:IC AMP INST LP LN 18MA 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 |
| AD620BRZ-R7 | 功能描述:IC AMP INST LP LN 18MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
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