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參數(shù)資料
| 型號： | LT1787CMS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調理 |
| 英文描述： | Precision, High Side Current Sense Amplifiers |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 205K |
| 代理商： | LT1787CMS8 |
7
LT1787/LT1787HV
The LT1787 high side current sense amplifier (Figure 1)
provides accurate bidirectional monitoring of current
through a user-selected sense resistor. The sense voltage
is amplified by a fixed gain of 8 and level shifted from the
positive power supply to the ground referenced outputs.
The output signal may be used in a variety of ways to
interface with subsequent signal processing circuitry.
Input and output filtering are easily implemented to elimi-
nate aliasing errors.
Theory of Operation
Inputs V
S+
and V
S–
apply the sense voltage to matched
resistors R
G1
and R
G2
. The opposite ends of resistors R
G1
and R
G2
are forced to be at equal potentials by the voltage
gain of amplifier A1. The currents through R
G1
and R
G2
are
forced to flow through transistors Q1 and Q2 and are
summed at node V
OUT
by the 1:1 current mirror. The net
current from R
G1
and R
G2
flowing through resistor R
OUT
gives a voltage gain of eight. Positive sense voltages result
in V
OUT
being positive with respect to pin V
BIAS
.
Pins V
EE
, V
BIAS
and V
OUT
may be connected in a variety of
ways to interface with subsequent circuitry. Split supply
BLOCK DIAGRA
M
W
R
SENSE
1787 F 01
R
1.25k
R
G2B
1.25k
R
1.25k
R
G1B
1.25k
V
OUT
I
OUT
V
BIAS
R
OUT
20k
V
S–
–
+
A1
Q1
Q2
CURRENT MIRROR
V
EE
FIL
–
V
S+
FIL
+
I
SENSE
Figure 1. LT1787 Functional Diagram
APPLICATIO
S I
N
FOR
ATIO
U
W
U
and single supply output configurations are shown in the
following sections.
Supply current for amplifier A1 is drawn from the V
S–
pin.
The user may choose to include this current in the moni-
tored current through R
SENSE
by careful choice of connec-
tion polarity.
Selection of External Current Sense Resistor
External R
SENSE
resistor selection is a delicate trade-off
between power dissipation in the resistor and current
measurement accuracy. The LT1787 makes this decision
less difficult than with competitors’ products. The maxi-
mum sense voltage may be as large as
±
500mV to get
maximum resolution, however, high current applications
will not want to suffer this much power dissipation in the
sense resistor. The LT1787’s input offset voltage of 40
μ
V
gives high resolution for low sense voltages. This wide
operating dynamic range gives the user wide latitude in
tailoring the range and resolution of his supply monitoring
function.
相關PDF資料 |
PDF描述 |
|---|---|
| LT1787CS8 | Precision, High Side Current Sense Amplifiers |
| LT1787HV | Precision, High Side Current Sense Amplifiers |
| LT1787HVIS8 | Precision, High Side Current Sense Amplifiers |
| LT1787HVCMS8 | Precision, High Side Current Sense Amplifiers |
| LT1789-1 | Micropower, Single Supply Rail-to-Rail Output Instrumentation Amplifiers |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1787CMS8#PBF | 功能描述:IC AMP PREC CURRENT SENSE 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 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） 供應商設備封裝:14-SOIC 包裝:管件 產品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
| LT1787CMS8#TR | 功能描述:IC AMP PREC CURRENT SENSE 8MSOP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 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） 供應商設備封裝:14-SOIC 包裝:管件 產品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
| LT1787CMS8#TRPBF | 功能描述:IC AMP PREC CURRENT SENSE 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 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） 供應商設備封裝:14-SOIC 包裝:管件 產品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
| LT1787CS8 | 功能描述:IC AMP PREC CURRENT SENSE 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:2pA 電壓 - 輸入偏移:1000µV 電流 - 電源:85µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 6 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOICN 包裝:剪切帶 (CT) 產品目錄頁面:680 (CN2011-ZH PDF) 其它名稱:MCP6L04T-E/SLCT |
| LT1787CS8#PBF | 功能描述:IC AMP PREC CURRENT SENSE 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝: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） 供應商設備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
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