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| 型號： | LT6109HMS-1#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 5/28頁 |
| 文件大?。?/td> | 370K |
| 代理商： | LT6109HMS-1#TRPBF |
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LT6109-1/LT6109-2
13
610912f
APPLICATIONS INFORMATION
In this case, the only error is due to external resistor
mismatch, which provides an error in gain only. However,
offset voltage, input bias current and finite gain in the
amplifier can cause additional errors:
Output Voltage Error,
VOUT(VOS), Due to the Amplifier
DC Offset Voltage, VOS
VOUT(VOS) = VOS
ROUT
RIN
The DC offset voltage of the amplifier adds directly to the
value of the sense voltage, VSENSE.AsVSENSEisincreased,
accuracy also improves. This is the dominant error of the
system and it limits the available dynamic range.
Output Voltage Error,
VOUT(IBIAS), Due to the Bias
Currents IB+ and IB–
The amplifier bias current IB+ flows into the SENSELO pin
while IB– flows into the SENSEHI pin. The error due to IB
is the following:
VOUT(IBIAS) =ROUT IB+
RSENSE
RIN
–IB
–
Since IB+ ≈ IB– = IBIAS, if RSENSE << RIN then,
VOUT(IBIAS) = –ROUT BIAS)
It is useful to refer the error to the input:
VVIN(IBIAS) = –RIN (IBIAS)
For instance, if IBIAS is 100nA and RIN is 1k, the input re-
ferred error is 100V. This error becomes less significant
as the value of RIN decreases. The bias current error can
be reduced if an external resistor, RIN+, is connected as
shown in Figure 5, the error is then reduced to:
VOUT(IBIAS) = ±ROUT IOS; IOS = IB+ – IB–
Adding RIN+asdescribedwillmaximizethedynamicrange
of the circuit as shown in Figure 5.
to place RIN and ROUT such that the gain error due to the
thermal gradient is minimized.
Selection of External Output Resistor, ROUT
The output resistor, ROUT, determines how the output cur-
rent is converted to voltage. VOUT is simply IOUTA ROUT.
Typically, ROUT is a combination of resistors configured
as a resistor divider which has voltage taps going to the
comparator inputs to set the comparator thresholds.
In choosing an output resistor, the maximum output volt-
age must first be considered. If the subsequent circuit is a
buffer or ADC with limited input range, then ROUT must be
chosen so that IOUTA(MAX) ROUT is less than the allowed
maximum input range of this circuit.
In addition, the output impedance is determined by ROUT.
If another circuit is being driven, then the input impedance
ofthatcircuitmustbeconsidered.Ifthesubsequentcircuit
has high enough input impedance, then almost any use-
ful output impedance will be acceptable. However, if the
subsequent circuit has relatively low input impedance, or
draws spikes of current such as an ADC load, then a lower
outputimpedancemayberequiredtopreservetheaccuracy
of the output. More information can be found in the Output
Filtering section. As an example, if the input impedance of
the driven circuit, RIN(DRIVEN), is 100 times ROUT, then the
accuracy of VOUT will be reduced by 1% since:
VOUT = IOUTA
ROUT RIN(DRIVEN)
ROUT +RIN(DRIVEN)
= IOUTA ROUT
100
101
= 0.99 IOUTA ROUT
Amplifier Error Sources
The current sense system uses an amplifier and resistors
to apply gain and level-shift the result. Consequently, the
output is dependent on the characteristics of the amplifier,
such as gain error and input offset, as well as the matching
of the external resistors.
Ideally, the circuit output is:
VOUT = VSENSE
ROUT
RIN
; VSENSE = RSENSE ISENSE
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LT6109HMS-2#PBF | 功能描述:IC AMP CURRENT SENSE 10-MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變增益放大器 應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LT6109HMS-2#TRPBF | 功能描述:IC AMP CURRENT SENSE 10MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變增益放大器 應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LT6109IMS-1#PBF | 功能描述:IC AMP CURRENT SENSE 10MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變增益放大器 應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LT6109IMS-1#TRPBF | 功能描述:IC AMP CURRENT SENSE 10MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變增益放大器 應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LT6109IMS-2#PBF | 功能描述:IC AMP CURRENT SENSE 10MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變增益放大器 應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
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