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參數(shù)資料
| 型號： | LM6134 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Low Power 10 MHz Rail-to-Rail I/O Operational Amplifiers |
| 中文描述： | 低功耗10兆赫軌到軌輸入/輸出運算放大器 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大小： | 361K |
| 代理商： | LM6134 |
LM6132/34 Application Hints
(Continued)
cellent response is obtained with a C
f
of 39 pF. In Figure 4
the supplies have been reduced to
±
2.5V, the pulse is
4 Vp-p and C
is 39 pF. The best value for the compensation
capacitor should be established after the board layout is fin-
ished because the value is dependent on board stray capac-
ity, the value of the feedback resistor, the closed loop gain
and, to some extent, the supply voltage.
Another effect that is common to all opamps is the phase
shift caused by the feedback resistor and the input capaci-
tance. This phase shift also reduces phase margin. This ef-
fect is taken care of at the same time as the effect of the ca-
pacitive load when the capacitor is placed across the
feedback resistor.
The circuit shown in Figure 5 was used for these scope
photos.
Figure 6 shows a method for compensating for load capaci-
tance (C
) effects by adding both an isolation resistor Ro at
the output and a feedback capacitor C
directly between the
output and the inverting input pin. Feedback capacitor C
F
compensates for the pole introduced by R
and C
, minimiz-
ing ringing in the output waveform while the feedback resis-
tor R
F
compensates for dc inaccuracies introduced by R
o
.
Depending on the size of the load capacitance, the value of
R
o
is typically chosen to be between 100
to 1 k
.
Typical Applications
3 OPAMP INSTRUMENTATION AMP WITH
RAIL-TO-RAIL INPUT AND OUTPUT
Using the LM6134, a 3 opamp instrumentation amplifier with
rail-to-rail inputs and rail to rail output can be made. These
features make these instrumentation amplifiers ideal for
single supply systems.
Some manufacturers use a precision voltage divider array of
5 resistors to divide the common-mode voltage to get an in-
put range of rail-to-rail or greater. The problem with this
method is that it also divides the signal, so to even get unity
gain, the amplifier must be run at high closed loop gains.
This raises the noise and drift by the internal gain factor and
lowers the input impedance. Any mismatch in these preci-
sion resistors reduces the CMR as well. Using the LM6134,
all of these problems are eliminated.
In this example, amplifiers A and B act as buffers to the dif-
ferential stage (Figure 7). These buffers assure that the input
impedance is over 100 M
and they eliminate the require-
ment for precision matched resistors in the input stage. They
also assure that the difference amp is driven from a voltage
source. This is necessary to maintain the CMR set by the
matching of R1–R2 with R3–R4.
DS012349-45
FIGURE 3.
DS012349-42
FIGURE 4.
DS012349-43
FIGURE 5.
DS012349-37
FIGURE 6.
L
www.national.com
10
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM6134AIM | Low Power 10 MHz Rail-to-Rail I/O Operational Amplifiers |
| LM6134AIN | Low Power 10 MHz Rail-to-Rail I/O Operational Amplifiers |
| LM6134BIMX | Low Power 10 MHz Rail-to-Rail I/O Operational Amplifiers |
| LM6134BIN | Low Power 10 MHz Rail-to-Rail I/O Operational Amplifiers |
| LM6134BIM | Low Power 10 MHz Rail-to-Rail I/O Operational Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM6134AIM | 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(bǔ)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(fēng)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 |
| LM6134AIM | 制造商:Texas Instruments 功能描述:AMP QUAD 7MHZ RRI/O 6134 SOIC14 |
| LM6134AIM/NOPB | 功能描述:運算放大器 - 運放 7Mhz,350Ua Supl.Cur Quad Amp 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(bǔ)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(fēng)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 |
| LM6134AIMX | 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(bǔ)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(fēng)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 |
| LM6134AIMX/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(bǔ)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(fēng)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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