VOUT1 – + – + 10 AD621 DAC 0 TO 10V – + V" />
參數資料
型號: AD621BN
廠商: Analog Devices Inc
文件頁數: 4/16頁
文件大?。?/td> 0K
描述: IC AMP INST LDRIFT LP 18MA 8DIP
產品變化通告: Product Discontinuance 27/Oct/2011
標準包裝: 50
放大器類型: 儀表
電路數: 1
轉換速率: 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: 通孔
封裝/外殼: 8-DIP(0.300",7.62mm)
供應商設備封裝: 8-PDIP
包裝: 管件
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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AD621BNZ 功能描述:IC AMP INST LDRIFT LP 18MA 8DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數:4 輸出類型:- 轉換速率: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) 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR
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