参数资料
| 型号： | EL2126CW-T7A |
| 厂商： | Intersil |
| 文件页数： | 7/19页 |
| 文件大小： | 0K |
| 描述： | IC AMP ULT LO NOISE/PWR SOT23-5 |
| 标准包装： | 250 |
| 放大器类型： | 电压反馈 |
| 电路数： | 1 |
| 转换速率： | 150 V/µs |
| -3db带宽： | 135MHz |
| 电流 - 输入偏压： | 7µA |
| 电压 - 输入偏移： | 500µV |
| 电流 - 电源： | 5mA |
| 电流 - 输出 / 通道： | 220mA |
| 电压 - 电源，单路/双路(±)： | 5 V ~ 30 V，±2.5 V ~ 15 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
15
FN7046.4
May 2, 2007
Applications Information
Product Description
The EL2126 is an ultra-low noise, wideband monolithic
operational amplifier built on Elantec's proprietary high
speed complementary bipolar process. It features 1.3nV/
√Hz
input voltage noise, 200V typical offset voltage, and 73dB
THD. It is intended for use in systems such as ultrasound
imaging where very small signals are needed to be
amplified. The EL2126 also has excellent DC specifications:
200V VOS, 22A IB, 0.4A IOS, and 106dB CMRR. These
specifications allow the EL2126 to be used in DC-sensitive
applications such as difference amplifiers.
Gain-Bandwidth Product
The EL2126 has a gain-bandwidth product of 650MHz at
±5V. For gains less than 20, higher-order poles in the
amplifier's transfer function contribute to even higher closed-
loop bandwidths. For example, the EL2126 has a -3dB
bandwidth of 100MHz at a gain of 10 and decreases to
33MHz at gain of 20. It is important to note that the extra
bandwidth at lower gain does not come at the expenses of
stability. Even though the EL2126 is designed for gain
≥ 10.
With external compensation, the device can also operate at
lower gain settings. The RC network shown in Figure 50
reduces the feedback gain at high frequency and thus
maintains the amplifier stability. R values must be less than
RF divided by 9 and 1 divided by 2
πRC must be less than
200MHz.
Choice of Feedback Resistor, RF
The feedback resistor forms a pole with the input
capacitance. As this pole becomes larger, phase margin is
reduced. This increases ringing in the time domain and
peaking in the frequency domain. Therefore, RF has some
maximum value which should not be exceeded for optimum
performance. If a large value of RF must be used, a small
capacitor in the few pF range in parallel with RF can help to
reduce this ringing and peaking at the expense of reducing
the bandwidth. Frequency response curves for various RF
values are shown in the typical performance curves section
of this data sheet.
Noise Calculations
The primary application for the EL2126 is to amplify very
small signals. To maintain the proper signal-to-noise ratio, it
is essential to minimize noise contribution from the amplifier.
Figure 51 shows all the noise sources for all the components
around the amplifier.
VN is the amplifier input voltage noise
IN+ is the amplifier positive input current noise
IN- is the amplifier negative input current noise
VRX is the thermal noise associated with each resistor:
where:
k is Boltzmann's constant = 1.380658 x 10-23
T is temperature in degrees Kelvin (273 + °C)
The total noise due to the amplifier seen at the output of the
amplifier can be calculated by using the Equation 2.
As the equation shows, to keep noise at a minimum, small
resistor values should be used. At higher amplifier gain
configuration where R2 is reduced, the noise due to IN-, R2,
and R1 decreases and the noise caused by IN+, VN, and R3
starts to dominate. Because noise is summed in a root-
mean-squares method, noise sources smaller than 25% of
the largest noise source can be ignored. This can greatly
simplify the formula and make noise calculation much easier
to calculate.
-
+
RF
R
C
VIN
VOUT
FIGURE 50.
-
+
VON
VIN
IN+
IN-
R2
R3
R1
VN
VR3
VR2
VR1
FIGURE 51.
V
RX
4kTRx
=
(EQ. 1)
V
ON
BW
=
VN
2
1
R
1
R
2
-------
+
2
×
IN-
2
R
1
2
IN+
2
R
3
2
1
R
1
R
2
-------
+
2
×
+
×
4K
T
R
1
4KTR
2
R
1
R
2
-------
2
×
+
×
4KTR
3
1
R
1
R
2
-------
+
2
×
++
+
×
(EQ. 2)
EL2126
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| EL2126CWZ-T7 | 功能描述:高速运算放大器 EL2126CWZ LW NOISE CVR A=10 RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| EL2126CWZ-T7A | 功能描述:高速运算放大器 EL2126CWZ LW NOISE CVR A=10 RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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| EL212-V | 功能描述:晶体管输出光电耦合器 Optocouplers RoHS:否 制造商:Vishay Semiconductors 输入类型:DC 最大集电极/发射极电压:70 V 最大集电极/发射极饱和电压:0.4 V 绝缘电压:5300 Vrms 电流传递比:100 % to 200 % 最大正向二极管电压:1.65 V 最大输入二极管电流:60 mA 最大集电极电流:100 mA 最大功率耗散:100 mW 最大工作温度:+ 110 C 最小工作温度:- 55 C 封装 / 箱体:DIP-4 封装:Bulk |
| EL213 | 功能描述:晶体管输出光电耦合器 Optocouplers RoHS:否 制造商:Vishay Semiconductors 输入类型:DC 最大集电极/发射极电压:70 V 最大集电极/发射极饱和电压:0.4 V 绝缘电压:5300 Vrms 电流传递比:100 % to 200 % 最大正向二极管电压:1.65 V 最大输入二极管电流:60 mA 最大集电极电流:100 mA 最大功率耗散:100 mW 最大工作温度:+ 110 C 最小工作温度:- 55 C 封装 / 箱体:DIP-4 封装:Bulk |
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