参数资料
| 型号： | LTC6241IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | IC OP AMP DUAL R-R 8-DFN |
| 标准包装： | 2,500 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 10 V/µs |
| 增益带宽积： | 18MHz |
| 电流 - 输入偏压： | 0.2pA |
| 电压 - 输入偏移： | 100µV |
| 电流 - 电源： | 1.8mA |
| 电流 - 输出 / 通道： | 30mA |
| 电压 - 电源，单路/双路(±)： | 2.8 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 包装： | 带卷 (TR) |
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LTC6240/LTC6241/LTC6242
25
624012fe
1M Transimpedance Amplier with 43nV/√Hz
Output Noise
In a normal 1M transimpedance amplier, like that shown
on the back page of this data sheet, the output noise density
must be at least 130nV/√Hz at room temperature. This is
true even should the op amp be perfectly noiseless, because
the 1M resistor provides 130nV/√Hz of voltage noise at
room temperature independently of the op amp.
The circuit of Figure 13 provides an overall transimpedance
gain of 1MΩ, but it has an output noise density of only
43nV/√Hz, about 1/3 of the normal transimpedance ampli-
er. It does this by taking a higher initial transimpedance
gain of 10M and then attenuating by a factor of 10. The
transistor section provides voltage gain and works on a
54V supply voltage to guarantee adequate output swing.
By achieving an output swing of 50V before attenuation,
the circuit provides an output swing to 5V after attenu-
ation. The 10M resistor sets the gain of the TIA stage
and has a noise density of 400nV/√Hz. After attenuation,
the effective TIA gain drops to 1M while the noise oor
drops to 40nV/√Hz, which clearly dominates the observed
43nV/√Hz. Note the additional benet that the offset voltage
of the op amp is divided by 10. Worst-case output offset
for this circuit is 150μV over temperature.
Reference Buffer
Figure 14 shows the LTC6240 being utilized as a buffer
in conjunction with the LT1019 reference. The passive
R-C lter attenuates the reference noise and the LTC6240
provides a low noise buffer, resulting in an output noise
of 8nV/√Hz.
Figure 13. 1M Transimpedance Amplier with 43nV/√Hz Output Noise
Figure 14. Low Noise Reference Buffer
APPLICATIONS INFORMATION
5V
54V
–5V
–1.5V
3pF
PHOTODIODE
6241 F13
–5V
10k
–
+
LTC6240HV
100pF
10M
1%
0.3pF
1k
10k
2.4k
33k
MPSA06
43k
9.09k
1%
1/4W
1k
1%
VOUT
1M GAIN
(1V/μA)
10M GAIN
(10V/μA)
MPSA06
5V
–5V
6241 F14
0.2Ω
–
+
LTC6240HV
1M
10μF
CERAMIC
OR FILM
8nV/√Hz
VOUT
1μF
LT1019-2.5
180nV/√Hz
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6241IS8 | 制造商:Linear Technology 功能描述:OP Amp Dual GP R-R O/P 6V 8-Pin SOIC N |
| LTC6241IS8#PBF | 功能描述:IC OP AMP DUAL R-R 8-SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作温度:-40°C ~ 85°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-SOIC 包装:带卷 (TR) |
| LTC6241IS8#TR | 制造商:Linear Technology 功能描述:OP Amp Dual GP R-R O/P 6V 8-Pin SOIC N T/R |
| LTC6241IS8#TRPBF | 功能描述:IC OP AMP DUAL R-R 8-SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作温度:-40°C ~ 85°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-SOIC 包装:带卷 (TR) |
| LTC6242 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual/Quad 18MHz, Low Noise, Rail-to-Rail, CMOS Op Amps |
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