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参数资料
| 型号： | AD8205 |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 运动控制电子 |
| 英文描述： | Single-Supply 42 V System Difference Amplifier |
| 中文描述： | 单电源42 V系统差分放大器 |
| 文件页数： | 8/12页 |
| 文件大小： | 308K |
| 代理商： | AD8205 |
AD8205
THEORY OF OPERATION
The AD8205 is a single-supply difference amplifier that uses a
unique architecture to accurately amplify small differential cur-
rent shunt voltages in the presence of rapidly changing common-
mode voltages. It is offered in both packaged and die form.
Rev. 0 | Page 8 of 12
In typical applications, the AD8205 is used to measure current
by amplifying the voltage across a current shunt placed across
the inputs.
The gain of the AD8205 is 50 V/V, with an accuracy of 1.2%.
This accuracy is guaranteed over the operating temperature
range of 40°C to +125°C. The die temperature range is 40°C
to +150°C with a guaranteed gain accuracy of 1.3%.
The input offset is less than 2 mV referred to the input at 25°C,
and 4.5 mV maximum referred to the input over the full operat-
ing temperature range for the packaged part. The die input off-
set is less than 6 mV referred to the input over the die operating
temperature range.
The AD8205 operates with a single supply from 4.5 V to 10 V (ab-
solute maximum = 12.5 V). The supply current is less than 2 mA.
High accuracy trimming of the internal resistors allows the
AD8205 to have a common-mode rejection ratio better than
78 dB from dc to 20 kHz. The common-mode rejection ratio
over the operating temperature is 76 dB for both the die and
packaged part.
The output offset can be adjusted from 0.05 V to 4.8 V (V+ =
5 V) for unipolar and bipolar operation.
The AD8205 consists of two amplifiers (A1 and A2), a resistor
network, small voltage reference, and a bias circuit (not shown),
see Figure 13.
The set of input attenuators preceding A1 consist of R
A
, R
B
, and
R
C
, which reduce the common-mode voltage to match the input
voltage range of A1. The two attenuators form a balanced bridge
network. When the bridge is balanced, the differential voltage
created by a common-mode voltage is 0 V at the inputs of A1.
The input attenuation ratio is 1/16.7. The combined series resis-
tance of R
A
, R
B
, and R
C
is approximately 200 k ± 20%.
By attenuating the voltages at Pin 1 and Pin 8, the A1 amplifier
inputs are held within the power supply range, even if Pin 1 and
Pin 8 exceed the supply or fall below common (ground). A ref-
erence voltage of 250 mV biases the attenuator above ground.
This allows the amplifier to operate in the presence of negative
common-mode voltages.
The input network also attenuates normal (differential) mode
voltages. A1 amplifies the attenuated signal by 26. The input and
output of this amplifier are differential to maximize the ac
common-mode rejection.
A2 converts the differential voltage from A1 into a single-ended
signal and provides further amplification. The gain of this sec-
ond stage is 32.15.
The reference inputs, V
REF
1 and V
REF
2, are tied through resistors
to the positive input of A2, which allows the output offset to be
adjusted anywhere in the output operating range. The gain is
1 V/V from the reference pins to the output when the reference
pins are used in parallel. The gain is 0.5 V/V when they are used
to divide the supply.
The ratios of Resistors R
A
, R
B
, R
C
, R
D
, and R
F
are trimmed to a
high level of precision to allow the common-mode rejection
ratio to exceed 80 dB. This is accomplished by laser trimming
the resistor ratio matching to better than 0.01%.
The total gain of 50 is made up of the input attenuation of
1/16.7 multiplied by the first stage gain of 26 and the second
stage gain of 32.15.
The output stage is Class A with a PNP pull-up transistor and a
300 μA current sink pull-down.
0
AD8205
+IN
–IN
250mV
GND
A1
A2
R
A
R
A
R
B
R
B
R
F
R
F
R
D
R
D
R
E
R
F
R
C
R
C
V
OUT
R
REF
R
REF
V
REF
1
V
REF
2
Figure 13. Simplified Schematic
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相关代理商/技术参数 |
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| 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 |
| AD8205WYRZ | 功能描述:IC AMP DIFF 42V SGL 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:100 系列:- 放大器类型:通用 电路数:1 输出类型:- 转换速率:0.2 V/µs 增益带宽积:- -3db带宽:- 电流 - 输入偏压:100pA 电压 - 输入偏移:30µV 电流 - 电源:380µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):±2 V ~ 18 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:管件 |
| AD8205WYRZ-R7 | 功能描述:IC AMP DIFF 42V SGL 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
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