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參數(shù)資料
| 型號： | AD8227ARMZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP INSTR R-R 250KHZ 8MSOP |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 0.8 V/µs |
| -3db帶寬： | 250kHz |
| 電流 - 輸入偏壓： | 20nA |
| 電壓 - 輸入偏移： | 200µV |
| 電流 - 電源： | 350µA |
| 電流 - 輸出 / 通道： | 13mA |
| 電壓 - 電源，單路/雙路(±)： | 2.2 V ~ 36 V，±1.5 V ~ 18 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
AD8227
Rev. 0 | Page 20 of 2
4
REFERENCE TERMINAL
The output voltage of the AD8227 is developed with respect to
the potential on the reference terminal. This is useful when the
output signal needs to be offset to a precise midsupply level. For
example, a voltage source can be tied to the REF pin to level-
shift the output so that the AD8227 can drive a single-supply
ADC. The REF pin is protected with ESD diodes and should
not exceed either +VS or VS by more than 0.3 V.
For best performance, source impedance to the REF terminal
should be kept below 2 Ω. As shown in Figure 58, the reference
terminal, REF, is at one end of a 50 kΩ resistor. Additional imped-
ance at the REF terminal adds to this 50 kΩ resistor and results
in amplification of the signal connected to the positive input.
The amplification from the additional RREF can be calculated as
follows:
6(50 kΩ + RREF)/(60 kΩ + RREF)
Only the positive signal path is amplified; the negative path
is unaffected. This uneven amplification degrades CMRR.
INCORRECT
V
CORRECT
AD8227
OP1177
–
+
V
07
75
9-
05
9
REF
AD8227
REF
Figure 59. Driving the Reference Pin
INPUT VOLTAGE RANGE
Most instrumentation amplifiers have a very limited output
voltage swing when the common-mode voltage is near the
upper or lower limit of the part’s input range. The AD8227 has
the input common-mode range vs. output voltage of the part.
LAYOUT
To ensure optimum performance of the AD8227 at the PCB
level, care must be taken in the design of the board layout. The
pins of the AD8227 are arranged in a logical manner to aid in
this task.
8
7
6
1
2
3
5
4
–IN
RG
+VS
VOUT
REF
–VS
+IN
TOP VIEW
(Not to Scale)
AD8227
07
75
9-
0
60
Figure 60. Pinout Diagram
Common-Mode Rejection Ratio over Frequency
Poor layout can cause some of the common-mode signals to be
converted to differential signals before reaching the in-amp.
Such conversions occur when one input path has a frequency
response that is different from the other. To keep CMRR over
frequency high, the input source impedance and capacitance of
each path should be closely matched. Additional source resis-
tance in the input path (for example, for input protection) should
be placed close to the in-amp inputs, which minimizes the
interaction of the source resistance with parasitic capacitance
from the PCB traces.
Parasitic capacitance at the gain setting pins can also affect CMRR
over frequency. If the board design has a component at the gain
setting pins (for example, a switch or jumper), the component
should be chosen so that the parasitic capacitance is as small as
possible.
Power Supplies
A stable dc voltage should be used to power the instrumentation
amplifier. Noise on the supply pins can adversely affect perfor-
mance. See the PSRR performance curves in Figure 23 and
Figure 24 for more information.
A 0.1 μF capacitor should be placed as close as possible to each
supply pin. As shown in Figure 61, a 10 μF tantalum capacitor
can be used farther away from the part. In most cases, it can be
shared by other precision integrated circuits.
AD8227
+VS
+IN
–IN
LOAD
RG
REF
0.1F
10F
0.1F
10F
–VS
VOUT
07
75
9-
06
1
Figure 61. Supply Decoupling, REF, and Output Referred to Local Ground
References
The output voltage of the AD8227 is developed with respect to
the potential on the reference terminal. Care should be taken to
tie REF to the appropriate local ground.
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