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參數(shù)資料
| 型號： | AD8203YRZ-R7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | High Common-Mode Voltage, Single-Supply Difference Amplifier |
| 中文描述： | OP-AMP, 1000 uV OFFSET-MAX, PDSO8 |
| 封裝： | LEAD FREE, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大小： | 239K |
| 代理商： | AD8203YRZ-R7 |
AD8203
APPLICATIONS
The AD8203 difference amplifier is intended for applications
that require extracting a small differential signal in the presence
of large common-mode voltages. The input resistance is nominally
320 kΩ, and the device can tolerate common-mode voltages
higher than the supply voltage and lower than ground.
Rev. B | Page 14 of 20
10k
Ω
10k
Ω
100k
Ω
A2
A1
GND
–IN
OUT
+V
S
NC
+IN
AD8203
OUT
+V
S
R
EXT
V
CM
V
DIFF
2
GAIN =
14R
EXT
R
EXT
+ 100k
Ω
R
EXT
= 100k
Ω
GAIN
14 – GAIN
V
DIFF
2
NC = NO CONNECT
0
The open collector output stage sources current to within
20 mV of ground and to within 200 mV of V .
S
CURRENT SENSING
High Line, High Current Sensing
Basic automotive applications making use of the large common-
mode range are shown in
Figure 2 and Figure 3. The capability
of the device to operate as an amplifier in primary battery sup-
ply circuits is shown in
Figure 2. Figure 3 illustrates the ability
of the device to withstand voltages below system ground.
Figure 43. Adjusting for Gains < 14
The overall bandwidth is unaffected by changes in gain by using
this method, although there may be a small offset voltage due to
the imbalance in source resistances at the input to the buffer.
This can often be ignored, but if desired, it can be nulled by
inserting a resistor equal to 100 kΩ minus the parallel sum of
R
R
EXT
= 100 kΩ (yielding a composite gain of ×7), the optional
offset nulling resistor is 50 kΩ.
Low Current Sensing
The AD8203 is also used in low current sensing applications,
such as the 4 to 20 mA current loop shown in Figure 42. In such
applications, the relatively large shunt resistor can degrade the
common-mode rejection. Adding a resistor of equal value on the
low impedance side of the input corrects this error.
EXT
and 100 kΩ, in series with Pin 4. For example, with
Gains Greater Than 14
Connecting a resistor from the output of the buffer amplifier to
its noninverting input, as shown in Figure 44, increases the
gain. The gain is now multiplied by the factor R
100 kΩ); for example, the gain is doubled for R
EXT
= 200 kΩ.
Overall gains as high as 50 are achievable this way. Note that the
accuracy of the gain becomes critically dependent on the
resistor value at high gains. Also, the effective input offset
voltage at Pin 1 and Pin 8 (about six times the actual offset of
A1) limits the part’s use in high gain, dc-coupled applications.
5V
OUTPUT
10
Ω
1%
10
Ω
1%
NC = NO CONNECT
+
GND
NC
–IN
+IN
A1
+V
S
A2
OUT
AD8203
0
/(R
EXT
EXT
10k
Ω
10k
Ω
100k
Ω
A2
A1
GND
–IN
OUT
+V
S
NC
+IN
AD8203
OUT
+V
S
R
EXT
V
CM
V
DIFF
2
GAIN =
14R
EXT
R
EXT
– 100k
Ω
R
EXT
= 100k
Ω
GAIN
GAIN – 14
V
DIFF
2
NC = NO CONNECT
0
Figure 42. 4 to 20 mA Current Loop Receiver
GAIN ADJUSTMENT
The default gain of the preamplifier and buffer are ×7 and ×2,
respectively, resulting in a composite gain of ×14. With the
addition of external resistor(s) or trimmer(s), the gain can be
lowered, raised, or finely calibrated.
Gains Less Than 14
Since the preamplifier has an output resistance of 100 kΩ, an
external resistor connected from Pin 3 and Pin 4 to GND
decreases the gain by a factor
R
EXT
/(100 kΩ +
R
EXT
), as shown
in Figure 43.
Figure 44. Adjusting for Gains > 14
相關(guān)PDF資料 |
PDF描述 |
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| AD8203YRZ-RL | High Common-Mode Voltage, Single-Supply Difference Amplifier |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8203YRZ-RL | 功能描述:IC AMP DIFF 60KHZ 8SOIC 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(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:帶卷 (TR) |
| AD8205 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Single-Supply 42 V System Difference Amplifier |
| AD8205AR | 制造商:Analog Devices 功能描述:- Bulk |
| AD8205WHRZ | 制造商:Analog Devices 功能描述:42VSNGLSUPPLYDIFFAMP - Rail/Tube 制造商:Analog Devices 功能描述:IC OPAMP DIFF 50KHZ 8SOIC 制造商:Analog Devices 功能描述:42V Sngl Supply Diff Amp |
| AD8205WHRZ-RL | 制造商:Analog Devices 功能描述:42VSNGLSUPPLYDIFFAMP - Tape and Reel 制造商:Analog Devices 功能描述:IC OPAMP DIFF 50KHZ 8SOIC 制造商:Analog Devices 功能描述:42V Sngl Supply Diff Amp |
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