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參數(shù)資料
| 型號： | AD621BRZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP INST LDRIFT LP 18MA 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 1.2 V/µs |
| -3db帶寬： | 800kHz |
| 電流 - 輸入偏壓： | 500pA |
| 電壓 - 輸入偏移： | 50µV |
| 電流 - 電源： | 900µA |
| 電流 - 輸出 / 通道： | 18mA |
| 電壓 - 電源，單路/雙路(±)： | ±2.3 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) |
AD621
REV. B
–12–
AD548
TO
REF
C
R
TO
VOUT1
–
+
–
+
10
AD621
DAC
0 TO
10V
–
+
VDIFF
0.5V
INPUT A:
10V CM
VCOM
10V–
+
–
+
INPUT B:
1V
OFFSET
VDIFF + VOFFSET
(1.25V + 1V)
VOUT1
G = 10
–
+
10
AD621
VOUT2
TOTAL GAIN = 100
10k
OPTIONAL
USE THIS IN PLACE OF THE DAC FOR ZERO SUPPRESSION FUNCTION.
Figure 6. Suppressing a Large Common-Mode or Offset Voltage in Order to Measure a Small Differential Signal
(VS =
±15 V)
The AD621, as well as many other monolithic instrumentation
amplifiers, is based on the “three op amp” in amp circuit (Fig-
ure 7) amplifier. Since the input amplifiers (A1 and A2) have a
common-mode gain of unity and a differential gain equal to the
set gain of the overall in amp, the voltages V1 and V2 are defined
by the equations
V1 = VCM + G
× V
DIFF/2
V2 = VCM – G
× V
DIFF/2
The common-mode voltage will drive the outputs of amplifiers
A1 and A2 to the differential-signal voltage, multiplied by the
gain, spreads them apart. For a 10 V common-mode 0.1 V
differential input, V1 would be at 10.5 V and V2 at 9.5 V.
A1
A3
–
+
10k
A2
–
+
20k
+
–
V1
V2
INPUT AMPLIFIER
DIFFERENTIAL GAIN = 10
COMMON MODE GAIN = 1
OUTPUT AMPLIFIER
DIFFERENTIAL GAIN = 1
COMMON MODE GAIN = 1/1000
4.44k
Figure 7. Typical Three Op Amp Instrumentation
Amplifier, Differential Gain = 10
The AD621’s input amplifiers can provide output voltage within
2.5 V of the supplies. To avoid saturation of the input amplifier
the input voltage must therefore obey the equations:
VCM + G
× V
DIFF/2
≤ (Upper Supply – 2.5 V)
VCM – G
× V
DIFF/2
≥ (Lower Supply + 2.5 V)
Figure 8 shows the trade-off between common-mode and
differential-mode input for
±15 V supplies and G = 10.
By cascading with use of the optional AD621, the circuit of
Figure 6 will provide
±1 V of zero suppression at gains of 10
and 100 (at VOUT1 and VOUT2 respectively) with maximum TCs
of
±4 ppm/°C and ±8 ppm/°C, respectively. Therefore, depend-
ing on the magnitude of the differential input signal, either
VOUT1 or VOUT2 may be used as the output.
VCM – Volts
1.2
0.2
010
2
V
DIFF
–
Volts
48
1.0
0.8
0.6
0.4
6
0
12
Figure 8. Trade-Off Between VCM and VDIFF Range (VS =
±15 V, G = 10), for Reference Pin at Ground
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD621S | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Drift, Low Power Instrumentation Amplifier |
| AD621SQ/883B | 功能描述:儀表放大器 LOW DRIFT LOW POWER INAMP RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| AD621SQ883B2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Drift, Low Power Instrumentation Amplifier |
| AD622 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost Instrumentation Amplifier |
| AD622_1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost Instrumentation Amplifier |
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