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| 型號： | AD8218BRMZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 354K |
| 描述： | IC CURRENT MONITOR BI-DIR 8MSOP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 功能： | 電流監(jiān)控器 |
| 檢測方法： | 高端 |
| 精確度： | ±0.35% |
| 輸入電壓： | 4 V ~ 80 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) |
AD8218
Data Sheet
Rev. B | Page 10 of 16
THEORY OF OPERATION
AMPLIFIER CORE
In typical applications, the AD8218 amplifies a small differential
input voltage generated by the load current flowing through
a shunt resistor. The AD8218 rejects high common-mode vol-
tages (up to 80 V) and provides a ground-referenced, buffered
output. Figure 28 shows a simplified schematic of the AD8218.
V
REF
OAD
V
2
I
LOAD
V
1
SHUNT
4V
TO
80V
I
CHARGE
GND
5V
LDO
R2
R1
AD8218
R4
R3
+IN
IN
OUT
ENB
REF
GND
V
S
C
F
Figure 28. Simplified Schematic
The AD8218 is configured as a difference amplifier. The
transfer function is
OUT = ((R4/R1) ?(V
1
V
2
)) + V
REF
Resistors R4 and R1 are matched to within 0.01% and have
values of 1.5 M& and 75 k&, respectively, meaning an input-
to-output total gain of 20 V/V for the AD8218. The difference
between V1 and V2 is the voltage across the shunt resistor, or
VIN. Therefore, the input-to-output transfer function of the
AD8218 is
OUT (V) = (20 ?V
IN
) + V
REF
The AD8218 accurately amplifies the input differential signal,
rejecting high voltage common modes ranging from 4 V to 80 V.
The main amplifier uses a novel zero-drift architecture, providing
the end user with breakthrough temperature stability. The
offset drift is typically less than ?00 nV/癈. This performance
leads to optimal accuracy and dynamic range.
OUTPUT CLAMPING
After the input common-mode voltage in the application is
above 5.2 V, the internal LDO output of the AD8218 also
reaches its maximum value of 5.2 V, which is the maximum
output range of the AD8218. Because in typical applications
the output interfaces with a converter, clamping the AD8218
output voltage to 5.2 V ensures that the ADC input is not
damaged due to excessive overvoltage.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8218BRMZ-RL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Zero Drift, Bidirectional Current Shunt Monitor |
| AD8219 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Zero Drift, Unidirectional Current Shunt Monitor |
| AD8219BRMZ | 功能描述:IC CURRENT MONITOR UNI-DIR 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)流/電流管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 功能:電流開關(guān) 檢測方法:- 精確度:±10% 輸入電壓:1.7 V ~ 5.5 V 電流 - 輸出:600mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-UFQFN 供應(yīng)商設(shè)備封裝:10-UTQFN（1.4x1.8） 包裝:管件 |
| AD8219BRMZ_PROMO | 制造商:Analog Devices 功能描述:IC CURRENT MONITOR UNI-DIR |
| AD8219BRMZ-RL | 功能描述:IC CURRENT MONITOR UNI-DIR 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)流/電流管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 功能:電流開關(guān) 檢測方法:- 精確度:±10% 輸入電壓:1.7 V ~ 5.5 V 電流 - 輸出:600mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-UFQFN 供應(yīng)商設(shè)備封裝:10-UTQFN（1.4x1.8） 包裝:管件 |
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