参数资料
| 型号： | AD8207WBRZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC AMP 65V DIFF BIDIRECT 8SOIC |
| 标准包装： | 1,000 |
| 放大器类型： | 零漂移 |
| 电路数： | 1 |
| 转换速率： | 1 V/µs |
| -3db带宽： | 150kHz |
| 电压 - 输入偏移： | 100µV |
| 电流 - 电源： | 2.5mA |
| 电压 - 电源，单路/双路(±)： | 3.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°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： | 带卷 (TR) |
AD8207
Rev. 0 | Page 10 of 16
THEORY OF OPERATION
The AD8207 is a single-supply, zero drift, difference amplifier
that uses a unique architecture to accurately amplify small
differential current shunt voltages in the presence of rapidly
changing common-mode voltage.
In typical applications, the AD8207 is used to measure current
by amplifying the voltage across a shunt resistor connected to
its inputs.
The AD8207 includes a zero-drift amplifier, a precision resistor
network, a common-mode control amplifier, and a precision
reference (see Figure 25).
A set of precision-trimmed resistors make up the network
that attenuates the input common-mode voltage to within the
supply range of the amplifier, in this case with a ratio of 20/1.
This attenuation ensures that when the input pins are externally
at the common-mode extremes of 4 V and +65 V, the actual
voltage at the inputs of the main amplifier is still within the
supply range.
The input resistor network also attenuates normal (differential)
mode voltages. Therefore, the total internal gain of the AD8207
is set to 400 V/V to provide a total system gain of 20 V/V.
Total Gain (V/V) = 1/20 (V/V) × 400 (V/V) = 20 V/V
The AD8207 is designed to provide excellent common-mode
rejection, even with PWM common-mode inputs that can
change at very fast rates, for example, 1 V/ns. An internal
common-mode control amplifier is used to maintain the input
common mode of the main amplifier at 3.5 V (with 5 V supply),
and therefore eliminates the negative effects of such fast-
changing external common-mode variations.
The AD8207 features an input offset drift of less than
500 nV/°C. This performance is achieved through a novel
zero-drift architecture that does not compromise band-
width, which is typically rated at 150 kHz.
The reference inputs, VREF1 and VREF2, are tied through 100 kΩ
resistors to the positive input of the main amplifier, 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. When
the pins are used to divide the supply, the gain is 0.5 V/V.
The AD8207 offers breakthrough performance without
compromising any of the robust application needs typical
of solenoid or motor control. The part rejects PWM input
common-mode voltages, while the zero-drift architecture yields
the lowest offset and offset drift performance on the market.
ZERO-DRIFT
AMPLIFIER
AD8207
COMMON-MODE
CONTROL AMPLIFIER
3.5V/2.2V
REF
60k
120k
SHUNT
120k
+IN
GND
–IN
OUT
VREF1
VREF2
60k
9k
50k
6k
09
16
0-
0
25
100k
Figure 25. Simplified Schematic
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8207WBRZ-RL | 功能描述:IC AMP 65V DIFF BIDIRECT 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:3 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:70µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:Digi-Reel® 其它名称:MAX4475AUT#TG16DKR |
| AD8208 | 制造商:AD 制造商全称:Analog Devices 功能描述:High Voltage, Precision Difference Amplifier |
| AD8208WBRMZ | 功能描述:IC AMP DIFF PREC 8MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.028 V/µs 增益带宽积:105kHz -3db带宽:- 电流 - 输入偏压:3nA 电压 - 输入偏移:100µV 电流 - 电源:3.3µA 电流 - 输出 / 通道:12mA 电压 - 电源，单路/双路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:剪切带 (CT) 其它名称:OP481GRUZ-REELCT |
| AD8208WBRMZ-R7 | 功能描述:IC AMP DIFF PREC 8MSOP 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 |
| AD8208WBRMZ-RL | 功能描述:IC AMP DIFF PREC 8MSOP 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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