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參數(shù)資料
| 型號： | LMV796 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifiers |
| 中文描述： | 17兆赫，低噪聲，CMOS輸入，1.8V的運算放大器 |
| 文件頁數(shù)： | 16/19頁 |
| 文件大?。?/td> | 1152K |
| 代理商： | LMV796 |
Application Information
(Continued)
(3)
Calculating C
from
Equation (3)
can sometimes return un-
reasonably small values (
<
1 pF), especially for high speed
applications. In these cases, it is often more practical to use
the circuit shown in
Figure 10
in order to allow more reason-
able values. In this circuit, the capacitance C
F
' is (1+ R
/R
)
times the effective feedback capacitance, C
. A larger ca-
pacitor can now be used in this circuit to obtain a smaller
effective capacitance.
For example, if a C
F
of 0.5 pF is needed, while only a 5 pF
capacitor is available, R
B
and R
A
can be selected such that
R
B
/R
A
= 9. This would convert a C
F
' of 5 pF into a C
F
of
0.5 pF. This relationship holds as long as R
A
<<
R
F
.
LMV796 AS A TRANSIMPEDANCE AMPLIFIER
The LMV796 was used in the designs for a number of
amplifiers with varying transimpedance gains and source
capacitances. The gains, bandwidths and feedback capaci-
tances of the circuits created are summarized in
Table 1
. The
frequency responses are presented in
Figure 11
and
Figure
12
. The feedback capacitances are slightly different from the
formula in
Equation (3)
, since the parasitic capacitance of
the board and the feedback resistor R
F
had to be accounted
for.
TABLE 1.
Transimpedance, A
TI
470000
470000
470000
47000
47000
47000
C
IN
50 pF 1.5 pF
100 pF 2.0 pF
200 pF 3.0 pF
50 pF 4.5 pF
100 pF 6.0 pF
200 pF 9.0 pF
C
F
3 dB Frequency
350 kHz
250 kHz
150 kHz
1.5 MHz
1 MHz
700 kHz
HIGH GAIN WIDEBAND TRANSIMPEDANCE
AMPLIFIER USING THE LMV797
The LMV797 dual, low noise, wide bandwidth, CMOS input
op amp IC can be used for compact, robust and integrated
solutions for sensing and amplifying wide-band signals ob-
tained from sensitive photodiodes. One of the two op amps
available can be used to obtain transimpedance gain while
20183584
FIGURE 9. C
F
Selection for Stability
20183571
FIGURE 10. Obtaining Small C
F
from Large C
F
'
20183577
FIGURE 11. Frequency Response for A
TI
= 470000
20183578
FIGURE 12. Frequency Response for A
TI
= 47000
L
www.national.com
16
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMV796MF | 17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifiers |
| LMV796MFX | 17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifiers |
| LMV797 | 17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifiers |
| LMV797MM | 17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifiers |
| LMV797MMX | 17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV796MF | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV796MF/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV796MFX | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV796MFX/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV796QMF/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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