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參數(shù)資料
| 型號(hào)： | AD8207WBRZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 2/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP 65V DIFF BIDIRECT 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 零漂移 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 1 V/µs |
| -3db帶寬： | 150kHz |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 2.5mA |
| 電壓 - 電源，單路/雙路(±)： | 3.3 V ~ 5.5 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(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
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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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| AD8208 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Voltage, Precision Difference Amplifier |
| AD8208WBRMZ | 功能描述:IC AMP DIFF PREC 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
| AD8208WBRMZ-R7 | 功能描述:IC AMP DIFF PREC 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| AD8208WBRMZ-RL | 功能描述:IC AMP DIFF PREC 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| AD8208WBRZ | 功能描述:IC AMP DIFF PREC 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
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