參數(shù)資料
型號： THS4215DGNR
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝： POWERPAD, GREEN, PLASTIC, MSOP-8
文件頁數(shù)： 13/47頁
文件大小： 1197K
代理商： THS4215DGNR
_
+
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
both Rg and Rf, values, as shown in Figure 76, and
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
1.9 for Figure 76, as opposed to the 1.8 if RM 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
Product Folder Link(s): THS4211 THS4215
相關PDF資料
PDF描述
THS4215DGN 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS4215DRBR 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS4215DR 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS4215D 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS4215DRBT 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
相關代理商/技術參數(shù)
參數(shù)描述
THS4215DGNRG4 功能描述:高速運算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4215DR 功能描述:高速運算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4215DRB 制造商:Rochester Electronics LLC 功能描述:- Bulk
THS4215DRBR 功能描述:高速運算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4215DRBRG4 功能描述:高速運算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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