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参数资料
| 型号： | LTC6102CMS |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封装： | PLASTIC, MSOP-8 |
| 文件页数： | 3/20页 |
| 文件大小： | 257K |
| 代理商： | LTC6102CMS |
LTC6102/LTC6102HV
11
6102fa
must be chosen such that the max output voltage does
not exceed the LTC6102 max output voltage rating. If the
following circuit is a buffer or ADC with limited input range,
then ROUT must be chosen so that IOUT(MAX) ROUT is less
than the allowed maximum input range of this circuit.
In addition, the output impedance is determined by ROUT. If
the circuit to be driven has high enough input impedance,
then almost any output impedance will be acceptable.
However, if the driven circuit has relatively low input imped-
ance, or draws spikes of current, such as an ADC might
do, then a lower ROUT value may be required in order to
preserve the accuracy of the output. As an example, if the
input impedance of the driven circuit is 100 times ROUT,
then the accuracy of VOUT will be reduced by 1% since:
Error Sources
The current sense system uses an amplier and resistors
to apply gain and level shift the result. The output is then
dependent on the characteristics of the amplier, such as
gain and input offset, as well as resistor matching.
Ideally, the circuit output is:
VOUT = VSENSE
ROUT
RIN
;VSENSE =RSENSE ISENSE
In this case, the only error is due to resistor mismatch,
which provides an error in gain only.
Output Error, EOUT, Due to the Amplier DC Offset
Voltage, VOS
EOUT(VOS) = VOS (ROUT/RIN)
The DC offset voltage of the amplier adds directly to the
value of the sense voltage, VSENSE. This error is very small
(3μV typ) and may be ignored for reasonable values of RIN.
For very high dynamic range, this offset can be calibrated
in the system due to its extremely low drift.
APPLICATIONS INFORMATION
Figure 4. Second Input R Minimizes
Error Due to Input Bias Current
VOUT =IOUT
ROUT RIN(DRIVEN)
ROUT +RIN(DRIVEN)
=IOUT ROUT
100
101
= 0.99 IOUT ROUT
–INF
VREG
0.1μF
–INS
6102 F04
RIN
+ = RIN– – RSENSE
LTC6102
ROUT
VOUT
V+
LOAD
RSENSE
–
+
V+
V–
OUT
+IN
RIN
–
RIN
+
Output Error, EOUT, Due to the Bias Currents,
IB(+) and IB(–)
The input bias current of the LTC6102 is vanishingly small.
However, for very high resolution, or at high temperatures
where IB increases due to leakage, the current may be
signicant.
The bias current IB(+) ows into the positive input of the
internal op amp. IB(–) ows into the negative input.
EOUT(IBIAS) = ROUT((IB(+) (RSENSE/RIN) – IB(–))
Since IB(+) ≈ IB(–) = IBIAS, if RSENSE << RIN then,
EOUT(IBIAS) ≈ –ROUT IBIAS
For instance if IBIAS is 1nA and ROUT is 10k, the output
error is –10μV.
Note that in applications where RSENSE ≈ RIN, IB(+) causes
a voltage offset in RSENSE that cancels the error due to
IB(–) and EOUT(IBIAS) ≈ 0. In applications where RSENSE <
RIN, the bias current error can be similarly reduced if an
external resistor RIN(+) = (RIN – RSENSE) is connected as
shown in Figure 4. Under both conditions:
EOUT(IBIAS) = ± ROUT IOS; IOS = IB(+) – IB(–)
Adding RIN+ as described will maximize the dynamic
range of the circuit. For less sensitive designs, RIN+ is
not necessary.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6102CMS8#PBF | 功能描述:IC AMP CURRENT SENSE 8-MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Differential Circuit Design Techniques for Communication Applications 标准包装:1 系列:- 放大器类型:RF/IF 差分 电路数:1 输出类型:差分 转换速率:9800 V/µs 增益带宽积:- -3db带宽:2.9GHz 电流 - 输入偏压:3µA 电压 - 输入偏移:- 电流 - 电源:40mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VQFN 裸露焊盘，CSP 供应商设备封装:16-LFCSP-VQ 包装:剪切带 (CT) 产品目录页面:551 (CN2011-ZH PDF) 其它名称:ADL5561ACPZ-R7CT |
| LTC6102CMS8#TRPBF | 功能描述:IC AMP CURRENT SENSE 8-MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC6102CMS8-1#PBF | 功能描述:IC AMP CURRENT SENSE 8-MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Differential Circuit Design Techniques for Communication Applications 标准包装:1 系列:- 放大器类型:RF/IF 差分 电路数:1 输出类型:差分 转换速率:9800 V/µs 增益带宽积:- -3db带宽:2.9GHz 电流 - 输入偏压:3µA 电压 - 输入偏移:- 电流 - 电源:40mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VQFN 裸露焊盘，CSP 供应商设备封装:16-LFCSP-VQ 包装:剪切带 (CT) 产品目录页面:551 (CN2011-ZH PDF) 其它名称:ADL5561ACPZ-R7CT |
| LTC6102CMS8-1#TRPBF | 功能描述:IC AMP CURRENT SENSE 8-MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:2pA 电压 - 输入偏移:1000µV 电流 - 电源:85µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):1.8 V ~ 6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:剪切带 (CT) 产品目录页面:680 (CN2011-ZH PDF) 其它名称:MCP6L04T-E/SLCT |
| LTC6102CMS8PBF | 制造商:Linear Technology 功能描述:Zero-Drift curr Sense Amplifier LTC6102 |
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