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參數資料
| 型號： | AD8227BRZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 11/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP INSTR R-R 250KHZ 8-SOIC |
| 標準包裝： | 2,500 |
| 放大器類型： | 儀表 |
| 電路數： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉換速率： | 0.8 V/µs |
| -3db帶寬： | 250kHz |
| 電流 - 輸入偏壓： | 20nA |
| 電壓 - 輸入偏移： | 100µV |
| 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-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
AD8227
Rev. 0 | Page 19 of
24
THEORY OF OPERATION
A3
R2
8k
R1
8k
A1
A2
Q2
Q1
–IN
+IN
+VS
–VS
R3
50k
R4
10k
R5
10k
RB
+VS
–VS
VOUT
REF
07
75
9-
0
58
NODE 1
NODE 2
RG
+VS
–VS
VBIAS
+VS
–VS
NODE 4
NODE 3
R6
50k
DIFFERENCE
AMPLIFIER STAGE
GAIN STAGE
ESD AND
OVERVOLTAGE
PROTECTION
ESD AND
OVERVOLTAGE
PROTECTION
–VS
Figure 58. Simplified Schematic
ARCHITECTURE
The AD8227 is based on the classic three op amp topology. This
topology has two stages: a preamplifier to provide differential
amplification followed by a difference amplifier that removes
the common-mode voltage and provides additional amplifica-
tion. Figure 58 shows a simplified schematic of the AD8227.
The first stage works as follows. To maintain a constant voltage
across the bias resistor, RB, Amplifier A1 must keep Node 3 at a
constant diode drop above the positive input voltage. Similarly,
Amplifier A2 keeps Node 4 at a constant diode drop above the
negative input voltage. Therefore, a replica of the differential
input voltage is placed across the gain setting resistor, RG. The
current that flows across this resistance must also flow through
the R1 and R2 resistors, creating a gained differential signal
between the A2 and A1 outputs. Note that, in addition to a
gained differential signal, the original common-mode signal,
shifted a diode drop up, is also still present.
The second stage is a difference amplifier, composed of
Amplifier A3 and the R3 through R6 resistors. This stage
removes the common-mode signal from the amplified
differential signal and gains it by 5.
The transfer function of the AD8227 is
VOUT = G × (VIN+ VIN) + VREF
where:
G
R
G
kΩ
80
5 +
=
GAIN SELECTION
Placing a resistor across the RG terminals sets the gain of the
AD8227. The gain can be calculated by referring to Table 7 or
by using the following gain equation:
5
kΩ
80
=
G
R
G
Table 7. Gains Achieved Using Common Resistor Values
Standard Table Value of RG
Calculated Gain
No resistor
5
100 kΩ
5.8
49.9 kΩ
6.6
26.7 kΩ
8
20 kΩ
9
16 kΩ
10
10 kΩ
13
5.36 kΩ
19.9
2 kΩ
45
1.78 kΩ
49.9
1 kΩ
85
845 Ω
99.7
412 Ω
199
162 Ω
499
80.6 Ω
998
The AD8227 defaults to G = 5 when no gain resistor is used.
The tolerance and gain drift of the RG resistor should be added
to the specifications of the AD8227 to determine the total gain
accuracy of the system. When the gain resistor is not used, gain
error and gain drift are minimal.
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