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| 型號： | LT1999CS8-50#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OP AMP CURRENT SENSE 8-SOIC |
| 標準包裝： | 100 |
| 放大器類型： | 電流檢測 |
| 電路數(shù)： | 1 |
| 輸出類型： | 帶緩沖 |
| 轉換速率： | 3 V/µs |
| -3db帶寬： | 1.2MHz |
| 電流 - 輸入偏壓： | 137.5µA |
| 電壓 - 輸入偏移： | 500µV |
| 電流 - 電源： | 5.8mA |
| 電流 - 輸出 / 通道： | 40mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 5.5 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SO |
| 包裝： | 管件 |
LT1999-10/LT1999-20/
LT1999-50
15
1999fb
applicaTions inForMaTion
Input Common Mode Range
The LT1999 was optimized for high common mode re-
jection. Its input stage is balanced and fully differential,
designedtoamplifydifferentialsignalsandrejectcommon
mode signals. There is negligible crossover distortion due
to sense voltage reversals. The amplifier is most linear in
the zero-sense region.
With the V+ supply configured within the specified and
tested range (4.5V < V+ < 5.5V), the LT1999’s common
mode range extends from –5V to 80V. Pushing +IN and
–IN beyond the limits specified in the Absolute Maximum
table can turn on the voltage clamps designed to protect
the +IN and –IN pins during ESD events.
It is possible to operate the LT1999 on power supplies
as low as 4V (although it is not tested or specified below
4.5V). Operating the LT1999 on supplies below 4V will
produce erratic behavior. When operating the LT1999
with supplies as low as 4V, the common mode range for
inputs which extend below GND is reduced. Refer to the
Block Diagram (Figure 1). For inputs driven below V+,
diode D1 conducts. For proper operation, the input to the
transconductor V(G+IN) must be biased at approximately
2.25V above the GND pin. V(G+IN) sits on the centertap
of a voltage divider comprised of R+S and R+IN V(G–IN)
likewise sits in the middle of the voltage divider comprised
of R–S , and R–IN). The voltage on V(G+IN) input is given
by the following equation:
V(G+IN)= V +IN
R+S
R+S + R+IN
+ V+ VD1
(
) R+IN
R+S + R+IN
Setting V(G+IN) = 2.25V, the ratio (R+IN/R+S) to 5, and VD1
equal to 0.8V (cold temperatures), a plot of the lower input
common mode range plotted against supply is shown in
Figure 3.
Output Common Mode Range
The LT1999’s output common mode level is set by the
voltage on the REF pin. The REF pin sits in the middle of
a 160k to 160k voltage divider connected between V+ and
GND which sets the default open circuit potential of the
REF pin to mid-supply. It can be overdriven by an external
voltage source capable of driving 80k tied to a mid-supply
potential. See the Electrical Characteristics table for the
REF pin’s specified input voltage range.
Differential sampling of the OUT pin with respect the REF
pin provides the best noise immunity. Measurements of
the output voltage made differentially with respect to the
REF pin will provide the highest power supply and com-
mon mode rejection. Otherwise, power supply or GND pin
disturbances are divided by the REF pin’s voltage divider
and appear directly at the noninverting input of the trans-
resistance amplifier AO and are not rejected.
If not driven by a low impedance (<100Ω), the REF pin
should be filtered with at least 1nF of capacitance to a
low impedance, low noise ground plane. This external
capacitance will also provide a charge reservoir during
high frequency sampling of the REF pin by ADC inputs
attached to this pin.
Figure 3. Lower Input Common Mode vs Supply Voltage
SUPPLY VOLTAGE (V)
4
V CM(LOWER
LIMIT)
(V)
–2.0
–2.5
–3.0
–4.0
–5.0
–3.5
–4.5
–5.5
–6.0
4.75
4.25
5.25
1999 F03
5.5
4.5
5
BELOW GROUND INPUT
COMMON MODE RANGE
LIMITED BY V+
SUPPLY VOLTAGE
BELOW GROUND INPUT
COMMON MODE RANGE
LIMITED BY ESD CLAMPS
TYPICAL ESD CLAMP VOLTAGE
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1999HMS8-10 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage, Bidirectional Current Sense Amplifier Low Power Shutdown <10μA |
| LT1999HMS8-10#PBF | 功能描述:IC OP AMP CURRENT SENSE 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:100 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:- 轉換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SO 包裝:管件 |
| LT1999HMS8-10#TRPBF | 功能描述:IC OP AMP CURRENT SENSE 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:100 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:- 轉換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SO 包裝:管件 |
| LT1999HMS8-20 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage, Bidirectional Current Sense Amplifier Low Power Shutdown <10μA |
| LT1999HMS8-20#PBF | 功能描述:IC OP AMP CURRENT SENSE 8-MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°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:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
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