參數(shù)資料
型號(hào)： AD8574ARUZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 13/24頁(yè)
文件大小： 0K
描述： IC OPAMP CHOPPER R-R 14TSSOP
標(biāo)準(zhǔn)包裝： 96
放大器類型： 斷路器（零漂移）
電路數(shù)： 4
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 0.4 V/µs
增益帶寬積： 1.5MHz
電流 - 輸入偏壓： 10pA
電壓 - 輸入偏移： 1µV
電流 - 電源： 850µA
電流 - 輸出 / 通道： 30mA
電壓 - 電源，單路/雙路(±)： 2.7 V ~ 5.5 V
工作溫度： -40°C ~ 125°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： 管件
產(chǎn)品目錄頁(yè)面： 767 (CN2011-ZH PDF)
AD8571/AD8572/AD8574
Rev. E | Page 20 of 24
APPLICATIONS INFORMATION
5 V PRECISION STRAIN GAGE CIRCUIT
The extremely low offset voltage of the AD8572 makes it an ideal
amplifier for any application requiring accuracy with high gains,
such as a weigh scale or strain gage. Figure 63 shows a configura-
tion for a single-supply, precision strain gage measurement system.
The REF192 provides a 2.5 V precision reference voltage for A2.
The A2 amplifier boosts this voltage to provide a 4.0 V reference
for the top of the strain gage resistor bridge. Q1 provides the
current drive for the 350 Ω bridge network. A1 is used to amplify
the output of the bridge with the full-scale output voltage equal to
(
)
B
R
2
R
1
R +
×
2
(17)
where RB is the resistance of the load cell.
Using the values given in Figure 63, the output voltage linearly
varies from 0 V with no strain to 4 V under full strain.
VOUT
AD8572-A
R3
17.4k
R4
100
R1
17.4k
R2
100
0V TO 4V
NOTE:
USE 0.1% TOLERANCE RESISTORS.
20k
A1
AD8572-B
REF192
12k
1k
5V
2.5V
6
4
3
2
4.0V
40mV
FULL-SCALE
A2
350
LOAD
CELL
Q1
2N2222
OR
EQUIVALENT
01
10
4-
06
3
Figure 63. 5 V Precision Strain Gage Amplifier
3 V INSTRUMENTATION AMPLIFIER
The high common-mode rejection, high open-loop gain,
and operation down to 3 V of the supply voltage make the
AD857x family an excellent op amp choice for discrete single-
supply instrumentation amplifiers. The common-mode
rejection ratio of the AD857x is greater than 120 dB, but the
CMRR of the system is also a function of the external resistor
tolerances. The gain of the difference amplifier shown in Figure 64
is given as
+
+
=
1
R
2
R
2
V
2
R
1
R
4
R
3
R
4
R
1
V
OUT
1
(18)
V2
V1
VOUT
R1
R3
R4
R3
R2
AD8571/
AD8572/
AD8574
IF
=
, THEN VOUT =
(V1 – V2)
01
10
4-
0
64
Figure 64. Using the AD857x as a Difference Amplifier
In an ideal difference amplifier, the ratio of the resistors is set
equal to
3
R
4
R
1
R
2
R
A
V
=
(19)
Set the output voltage of the system to
VOUT = AV (V1 V2)
(20)
Due to finite component tolerance, the ratio between the four
resistors is not exactly equal, and any mismatch results in a
reduction of common-mode rejection from the system. Referring
to Figure 64, the exact common-mode rejection ratio can be
expressed as
R2R3
R1R4
R2R3
R2R4
1R4
R
CMRR
2
+
=
(21)
In the 3-op amp instrumentation amplifier configuration shown
in Figure 65, the output difference amplifier is set to unity gain
with all four resistors equal in value. If the tolerance of the
resistors used in the circuit is given as δ, the worst-case CMRR
of the instrumentation amplifier is
δ
=
2
1
MIN
CMRR
(22)
VOUT
R
AD8574-C
V2
R
V1
RG
AD8574-B
AD8574-A
RTRIM
VOUT = 1 +
2R
RG
(V1 – V2)
01
10
4-
0
65
Figure 65. Discrete Instrumentation Amplifier Configuration
Therefore, using 1% tolerance resistors results in a worst-case
system CMRR of 0.02, or 34 dB. To achieve high common-
mode rejection, either high precision resistors or an additional
trimming resistor, as shown in Figure 65, should be used. The
value of this trimming resistor should be equal to the value of
multiplied by its tolerance. For example, using 10 kΩ resistors
with 1% tolerance would require a series trimming resistor
equal to 100 Ω.
R
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