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参数资料
| 型号： | LMH6734MQX/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PDSO16 |
| 封装： | ROHS COMPLIANT, SSOP-16 |
| 文件页数： | 4/18页 |
| 文件大小： | 561K |
| 代理商： | LMH6734MQX/NOPB |
Application Information
GENERAL INFORMATION
The LMH6734 is a high speed current feedback selectable
gain buffer (SGB), optimized for very high speed applications.
With its internal feedback and gain-setting resistors,
R
F = RG = 327, the LMH6734 offers excellent AC perfor-
mance while simplifying board layout and minimizing the
effects of layout related parasitic components. The LMH6734
has no internal ground reference so single or split supply con-
figurations are both equally useful.
SETTING THE CLOSED LOOP GAIN
The LMH6734 can be configured with gain settings of
A
V = +2, +1, or 1. Table 1, shows the non-inverting and in-
verting pin connections to achieve the desired closed loop
gain.
Table 1. Setting the Closed Loop
Gain
GAIN A
V
INPUT CONNECTIONS
Non-Inverting
Inverting
1 V/V
Ground
Input Signal
+1 V/V
Input Signal
NC (Open)
+2 V/V
Input Signal
Ground
SPLIT SUPPLY APPLICATION
The recommended split supply circuit applications are shown
the input signal is DC coupled with a termination resister input
R
IN = 50. In Figure 1 the inverting input is connected to
ground completing the internal feedback loop to set the gain
to +2 V/V. In Figure 2 the inverting input is open (no-connect),
thus providing a buffer configuration of +1 V/V. Figure 3
shows a buffer configuration with a gain of 1 V/V. In this
configuration an input resistor of 59
was used to balance the
internal R
G resistor of 327 and to provide a 50 termination.
30003605
FIGURE 1. Recommended Split Supply Non-Inverting
Gain Circuit, Gain = +2 V/V
30003608
FIGURE 2. Recommended Split Supply Non-Inverting
Gain Circuit, Gain +1 V/V
30003603
FIGURE 3. Recommended Split Supply Inverting Gain
Circuit, Gain = –1 V/V
SINGLE SUPPLY APPLICATION
The LMH6734 can also be configured for single supply appli-
4, the 220
μF capacitor was chosen to satisfy low frequency
input signals and to provide an open for the internal feedback
network path, thus setting the gain to +1 V/V. With an AC sig-
nal present, this 220
μF capacitor is shunted to ground and
completes the feedback resistor network to set the AC cou-
pled gain of +2 V/V. The input is AC coupled with the 22
μF
capacitor and the two 4.7 k
resistors to set the input DC bias
voltage. Figure 5 shows the single supply buffer configuration
with the inverting input open (no-connect) creating an open to
the internal feedback network giving a gain of +1 V/V. The
input voltage is AC coupled with the 22
μF capacitor along
with two 4.7 k
resistors to set the input DC bias voltage.
Figure 6 shows the single supply buffer configuration for a
gain of 1 V/V. In this circuit, the input signal is DC coupled
into the inverting input closing the internal feedback network
and creating a gain of 1 V/V while an AC gain of +2 V/V is
present at the non-inverting input. Thus, the 6.8 k
and the
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12
LMH6734
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMH6738 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Very Wideband, Low Distortion Triple Op Amp |
| LMH6738MQ | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| LMH6738MQ/NOPB | 功能描述:运算放大器 - 运放 Triple Video Op-Amp RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| LMH6738MQX | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| LMH6738MQX/NOPB | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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