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參數(shù)資料
| 型號(hào)： | AD623A |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| 中文描述： | 單電源，軌至軌，低成本儀表放大器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 965K |
| 代理商： | AD623A |
AD623
–13–
REV. C
are common mode (the same on both in amp inputs) and are
not applied differentially. This second low pass network, R1+R2
and C3, has a –3 dB frequency equal to: 1/(2
π
(R1+R2) (C3)).
Using a C3 value of 0.047
μ
F as shown, the –3 dB signal BW of
this circuit is approximately 400 Hz. The typical dc offset shift
over frequency will be less than 1.5
μ
V and the circuit’s RF
signal rejection will be better than 71 dB. The 3 dB signal band-
width of this circuit may be increased to 900 Hz by reducing
resistors R1 and R2 to 2.2 k
. The performance is similar to
that using 4 k
resistors, except that the circuitry preceding the
in amp must drive a lower impedance load.
The circuit of Figure 43 should be built using a PC board with a
ground plane on both sides. All component leads should be as
short as possible. Resistors R1 and R2 can be common 1% metal
film units but capacitors C1 and C2 need to be
±
5% tolerance
devices to avoid degrading the circuit’s common-mode rejection.
Either the traditional 5% silver mica units or Panasonic
±
2%
PPS film capacitors are recommended.
R
G
+V
S
–IN
V
OUT
LOCATE C1–C3 AS CLOSE
TO THE INPUT PINS AS POSSIBLE
–V
S
0.01
m
F
REFERENCE
AD623
0.33
m
F
0.01
m
F
0.33
m
F
C3
0.047
m
F
C2
1000pF
5%
C1
1000pF
5%
R2
4.02k
V
1%
R1
4.02k
V
1%
+IN
Figure 43. Circuit to Attenuate RF Interference
In many applications shielded cables are used to minimize noise;
for best CMR over frequency the shield should be properly
driven. Figure 44 shows an active guard drive that is configured
to improve ac common-mode rejection by “bootstrapping” the
capacitances of input cable shields, thus minimizing the capaci-
tance mismatch between the inputs.
R
G
2
R
G
2
–INPUT
+INPUT
100
V
AD623
V
OUT
AD8031
+V
S
REFERENCE
–V
S
Figure 44. Common-Mode Shield Driver
GROUNDING
Since the AD623 output voltage is developed with respect to the
potential on the reference terminal, many grounding problems
can be solved by simply by tying the REF pin to the appropri-
ate “l(fā)ocal ground.” The REF pin should, however, be tied to a
low impedance point for optimal CMR.
The use of ground planes is recommended to minimize the
impedance of ground returns (and hence the size of dc errors).
In order to isolate low level analog signals from a noisy digital
environment, many data-acquisition components have separate
analog and digital ground returns (Figure 45). All ground pins
from mixed signal components such as analog-to-digital converters
should be returned through the “high quality” analog ground
DIGITAL POWER SUPPLY
0.1
m
F
V
IN1
V
IN2
V
DD
AGND DGND
AD7892-2
ADC
12
AGND
V
DD
m
PROCESSOR
0.1
m
F
0.1
m
F
0.1
m
F
AD623
ANALOG POWER SUPPLY
+5V
–5V
GND
GND
+5V
Figure 45. Optimal Grounding Practice for a Bipolar Supply Environment with Separate Analog and Digital Supplies
V
IN
V
DD
AGND DGND
AD7892-2
ADC
12
DGND
V
DD
m
PROCESSOR
0.1
m
F
AD623
0.1
m
F
0.1
m
F
POWER SUPPLY
+5V
GND
Figure 46. Optimal Ground Practice in a Single Supply Environment
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD623AN | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| AD623AR | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| AD623AR-REEL7 | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| AD623ARM | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| AD623ARM-REEL | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD623AN | 制造商:Analog Devices 功能描述:IC AMP INSTRUMENTATION DIP8 623 |
| AD623ANZ | 功能描述:IC AMP INST R-R LP 8DIP RoHS:是 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 |
| AD623AR | 功能描述:IC AMP INST R-R LP 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 |
| AD623AR | 制造商:Analog Devices 功能描述:SEMICONDUCTORS |
| AD623ARM | 制造商:Analog Devices 功能描述:SP Amp INSTR Amp Single R-R O/P 制造商:Analog Devices 功能描述:IC AMP INSTRUMENTATION |
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