參數(shù)資料
型號: AD622ARZ-R7
廠商: Analog Devices Inc
文件頁數(shù): 3/17頁
文件大小: 0K
描述: IC AMP INST LP 18MA 8SOIC
標(biāo)準(zhǔn)包裝: 750
放大器類型: 儀表
電路數(shù): 1
轉(zhuǎn)換速率: 1.2 V/µs
-3db帶寬: 1MHz
電流 - 輸入偏壓: 2nA
電壓 - 輸入偏移: 60µV
電流 - 電源: 900µA
電流 - 輸出 / 通道: 18mA
電壓 - 電源,單路/雙路(±): ±2.6 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)
AD622
Data Sheet
Rev. E | Page 10 of 16
The AD622 provides greater accuracy at lower cost. The higher
cost of the homebrew circuit is dominated in this case by the
matched resistor network. One could also realize a homebrew
design using cheaper discrete resistors that are either trimmed
or hand selected to give high common-mode rejection. This
level of common-mode rejection, however, degrades significantly
over temperature due to the drift mismatch of the discrete
resistors.
Note that for the homebrew circuit, the LT1013 specification for
noise has been multiplied by √2. This is because a two op amp
type instrumentation amplifier has two op amps at its inputs,
both contributing to the overall noise.
Table 5. Make vs. Buy Error Budget
Error Source
AD622 Circuit Calculation
Homebrew Circuit Calculation
Total Error in ppm
Relative to 1 V FS
AD622
Homebrew
ABSOLUTE ACCURACY at TA = 25°C
Total RTI Offset Voltage, V
125 V + 1500 V/10
800 V × 2
275
1600
Input Offset Current, nA
2.5 nA × 1 k
15 nA × 1 k
2.5
15
CMR, dB
86 dB
→50 ppm × 0.5 V
(0.1% Match × 0.5 V)/10 V
25
50
Total Absolute Error
302.5
1665
DRIFT TO 85°C
Gain Drift, ppm/°C
(50 ppm + 5 ppm) × 60°C
(50 ppm)/°C × 60°C
3300
3000
Total RTI Offset Voltage, V/°C
(1 V/°C + 15 V/°C /10) × 60°C
9 V/°C × 2 × 60°C
150
1080
Input Offset Current, pA/°C
2 pA/°C × 1 k × 60°C
155 pA/°C × 1 k × 60°C
0.12
9.3
Total Drift Error
3450.12
4089.3
RESOLUTION
Gain Nonlinearity, ppm of Full Scale
10 ppm
20 ppm
10
20
Typ 0.1 Hz to 10 Hz Voltage Noise, V p-p
0.6 V p-p
0.55 V p-p × √2
0.6
0.778
Total Resolution Error
10.6
20.778
Grand Total Error
3763
5775
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