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参数资料
| 型号： | THS4215DGN |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封装： | POWERPAD, GREEN, PLASTIC, MSOP-8 |
| 文件页数： | 13/47页 |
| 文件大小： | 1197K |
| 代理商： | THS4215DGN |
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_
+
THS4211
Rg
392
RT
200
100 pF
0.1
F
6.8
F
-VS
-5 V
50
Source
+
VI
100 pF
0.1
F
6.8
F
+
+VS
5 V
VO
CT
0.1
F
Rf
392
RM
57.6
499
SLOS400E – SEPTEMBER 2002 – REVISED SEPTEMBER 2009 ................................................................................................................................... www.ti.com
WIDEBAND, INVERTING GAIN OPERATION
dealing with low inverting gains, as the resultant
feedback resistor value can present a significant load
Since
the
THS4211
and
THS4215
are
to the amplifier output. For an inverting gain of 2,
general-purpose,
wideband
voltage-feedback
setting Rg to 49.9 for input matching eliminates the
amplifiers,
several
familiar
operational-amplifier
need for RM but requires a 100- feedback resistor.
applications circuits are available to the designer.
This has the advantage that the noise gain becomes
Figure 76 shows a typical inverting configuration
equal to 2 for a 50-
source impedance—the same
where the input and output impedances and noise
as the noninverting circuit in Figure 75. However, the
gain from Figure 75 are retained in an inverting circuit
amplifier output now sees the 100-
feedback
configuration.
Inverting
operation
is
a
common
resistor in parallel with the external load. To eliminate
requirement and offers several performance benefits.
this excessive loading, it is preferable to increase
The inverting configuration shows improved slew
rates and distortion due to the pseudo-static voltage
then achieve the input matching impedance with a
maintained on the inverting input.
third
resistor
(RM) to ground. The total input
impedance becomes the parallel combination of Rg
and RM.
The next major consideration is that the signal source
impedance becomes part of the noise gain equation
and hence influences the bandwidth. For example,
the RM value combines in parallel with the external
50-
source
impedance
(at
high
frequencies),
yielding an effective source impedance of 50
|| 57.6
= 26.8 . This impedance is then added in series
with Rg for calculating the noise gain. The result is
eliminated. The bandwidth is lower for the inverting
gain-of-2 circuit in Figure 76 (NG=+1.9), than for the
noninverting gain of 2 circuit in Figure 75.
The last major consideration in inverting amplifier
design is setting the bias-current cancellation resistor
on the noninverting input. If the resistance is set
equal to the total dc resistance looking out of the
Figure 76. Wideband, Inverting Gain
inverting terminal, the output dc error, due to the input
Configuration
bias currents, is reduced to (input offset current) × Rf
in Figure 76, the dc source impedance looking out of
In the inverting configuration, some key design
the inverting terminal is 392
|| (392 + 26.8 ) =
considerations must be noted. One is that the gain
200
. To reduce the additional high-frequency noise
resistor (Rg) becomes part of the signal-channel input
introduced by the resistor at the noninverting input,
impedance. If input impedance matching is desired
and power-supply feedback, RT is bypassed with a
(beneficial when the signal is coupled through a
capacitor to ground.
cable,
twisted
pair,
long
PCB
trace,
or
other
transmission line conductor), Rg may be set equal to
the required termination value and Rf adjusted to give
the desired gain. However, care must be taken when
20
Copyright 2002–2009, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS4215DGNG4 | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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 |
| THS4215DGNR | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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 |
| THS4215DGNRG4 | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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 |
| THS4215DR | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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 |
| THS4215DRB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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