- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄5320 > AD8202WYRMZ-RL (Analog Devices Inc)IC AMP DIFF 50KHZ 8MSOP PDF資料下載
參數(shù)資料
| 型號(hào)： | AD8202WYRMZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 4/20頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP DIFF 50KHZ 8MSOP |
| 產(chǎn)品培訓(xùn)模塊： | Current Sense Amplifiers |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 0.28 V/µs |
| 增益帶寬積： | 50kHz |
| 電流 - 輸入偏壓： | 40nA |
| 電壓 - 輸入偏移： | 2000µV |
| 電流 - 電源： | 250µA |
| 電壓 - 電源，單路/雙路(±)： | 3.5 V ~ 12 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
第1頁(yè)第2頁(yè)第3頁(yè)當(dāng)前第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)
AD8202
Data Sheet
Rev. H | Page 12 of 20
THEORY OF OPERATION
The AD8202 consists of a preamp and buffer arranged as shown
in Figure 40. Like-named resistors have equal values.
The preamp uses a dynamic bridge (subtractor) circuit.
Identical networks (within the shaded areas), consisting of RA,
RB, RC, and RG, attenuate input signals applied to Pin 1 and
Pin 8. When equal amplitude signals are asserted at Input 1 and
Input 8, and the output of A1 is equal to the common potential
(that is, 0), the two attenuators form a balanced-bridge network.
When the bridge is balanced, the differential input voltage at
A1, and thus its output, is 0.
Any common-mode voltage applied to both inputs keeps the
bridge balanced and the A1 output at 0. Because the resistor
networks are carefully matched, the common-mode signal
rejection approaches this ideal state.
However, if the signals applied to the inputs differ, the result is a
difference at the input to A1. A1 responds by adjusting its output
to drive RB, by way of RG, to adjust the voltage at its inverting
input until it matches the voltage at its noninverting input.
By attenuating voltages at Pin 1 and Pin 8, the amplifier inputs
are held within the power supply range, even if Pin 1 and Pin 8
input levels exceed the supply or fall below common (ground).
The input network also attenuates normal (differential) mode
voltages. RC and RG form an attenuator that scales A1 feedback,
forcing large output signals to balance relatively small differen-
tial inputs. The resistor ratios establish the preamp gain at 10.
Because the differential input signal is attenuated and then
amplified to yield an overall gain of 10, Amplifier A1 operates
at a higher noise gain, multiplying deficiencies such as input
offset voltage and noise with respect to Pin 1 and Pin 8.
A1
A3
RCM
(TRIMMED)
100k
RA
–IN
RG
RC
RB
RA
RC
RB
RG
+IN
COM
A2
RF
AD8202
5
4
3
1
2
8
04981-014
Figure 40. Simplified Schematic
To minimize these errors while extending the common-mode
range, a dedicated feedback loop is used to reduce the range of
common-mode voltage applied to A1 for a given overall range at
the inputs. By offsetting the voltage range applied to the com-
pensator, the input common-mode range is also offset to include
voltages more negative than the power supply.
Amplifier A3 detects the common-mode signal applied to A1
and adjusts the voltage on the matched RCM resistors to reduce
the common-mode voltage range at the A1 inputs. By adjusting
the common voltage of these resistors, the common-mode input
range is extended while, at the same time, the normal mode
signal attenuation is reduced, leading to better performance
referred to input.
The output of the dynamic bridge taken from A1 is connected
to Pin 3 by way of a 100 k series resistor, provided for low-
pass filtering and gain adjustment. The resistors in the input
networks of the preamp and the buffer feedback resistors are
ratio-trimmed for high accuracy.
The output of the preamp drives a gain-of-2 buffer amplifier,
A2, implemented with carefully matched feedback resistors (RF).
The 2-stage system architecture of the AD8202 enables the user
to incorporate a low-pass filter prior to the output buffer. By
separating the gain into two stages, a full-scale, rail-to-rail
signal from the preamp can be filtered at Pin 3, and a half-scale
signal, resulting from filtering, can be restored to full scale by
the output buffer amp. The source resistance seen by the
inverting input of A2 is approximately 100 k to minimize the
effects of the input bias current of A2. However, this current is
quite small, and errors resulting from applications that mismatch
the resistance are correspondingly small.
The A2 input bias current has a typical value of 40 nA, however,
this can increase under certain conditions. For example, if the
input signal to the A2 amplifier is VCC/2, the output attempts to
go to VCC due to the gain of 2. However, the output saturates
because the maximum specified voltage for correct operation is
200 mV below VCC. Under these conditions, the total input bias
current increases (see Figure 41 for more information).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M80-8870605 | CONN RECEPT 2MM VERT PCB 6POS |
| LTC6104IMS8#TRPBF | IC AMP CURRENT SENSE 8-MSOP |
| 950434-6102-AR | CONN SOCKET 34POS 2MM VERT T/H |
| OP184FSZ-REEL | IC OPAMP GP R-R 4.25MHZ LN 8SOIC |
| RGH2012-2E-P-222-B | RES 2.2K OHM .1% 1/4W 0805 SMD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8202WYRZ | 功能描述:IC AMP DIFF 50KHZ 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 |
| AD8202WYRZ-RL | 功能描述:IC AMP DIFF 50KHZ 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:帶卷 (TR) |
| AD8202YCSURF | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Common-Mode Voltage, Single-Supply Difference Amplifier |
| AD8202YR | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single 12V 8-Pin SOIC N Tube 制造商:Analog Devices 功能描述:IC AMP DIFFERENTIAL |
| AD8202YRM | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。