參數(shù)資料
型號(hào)： THS4281DGK
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： GREEN, PLASTIC, MSOP-8
文件頁(yè)數(shù)： 11/37頁(yè)
文件大小： 1063K
代理商： THS4281DGK
_
+
Rg
2.49 k
RT
1.24 k
0.1
F
6.8
F
VS
50-
Source
+
VI
0.1
F
6.8
F
+
+VS
VO
CT
0.1
F
Rf
2.49 k
RM
51.1
To Load
_
+
49.9
50-
Source
VI
+VS
VO
Rf
2 k
Rg
2 k
+VS
2
+VS
2
_
+
2 k
50-
Source
VI
VS
VO
Rf
2 k
51.1
Rg
RT
+VS
2
+VS
2
To Load
RT
CT
Power Supply Bypassing
Not Shown For Simplicity
www.ti.com
SLOS432A – APRIL 2004 – REVISED NOVEMBER 2009
WIDEBAND, INVERTING OPERATION
Another consideration in inverting amplifier design is
setting the bias current cancellation resistor (RT) on
Figure 71 shows a typical inverting configuration
the noninverting input. If the resistance is set equal to
where the input and output impedances and noise
the total dc resistance presented to the device at the
gain from Figure 68 are retained with an inverting
inverting terminal, the output dc error (due to the
circuit gain of –1 V/V.
input bias currents) is reduced to the input offset
current multiplied by RT. In Figure 71, the dc source
impedance presented at the inverting terminal is 2.49
k
|| (2.49 k + 25.3 ) ≈ 1.24 k. To reduce the
additional high-frequency noise introduced by the
resistor at the noninverting input, RT is bypassed with
a 0.1-
μF capacitor to ground (CT).
SINGLE-SUPPLY OPERATION
The THS4281 is designed to operate from a single
2.7-V to 16.5-V power supply. When operating from a
single power supply, care must be taken to ensure
the input signal and amplifier are biased appropriately
to allow for the maximum output voltage swing and
not violate VICR. The circuits shown in Figure 72
shows
inverting
and
noninverting
amplifiers
configured for single-supply operation.
Figure 71. Wideband, Inverting Gain
Configuration
In the inverting configuration, some key design
considerations must be noted. One is that the gain
resistor (Rg) becomes part of the signal channel input
impedance. If the input impedance matching is
desired (which is beneficial whenever the signal is
coupled through a cable, twisted pair, long PCB
trace, or other transmission line conductors), Rg may
be set equal to the required termination value and Rf
adjusted to give the desired gain. However, care
must be taken when dealing with low inverting gains,
as the resulting feedback resistor value can present a
significant load to the amplifier output. For example,
an inverting gain of 2, setting Rg to 49.9 for input
matching, eliminates the need for RM but requires a
100-
feedback
resistor.
The
100-
feedback
resistor, in parallel with the external load, causes
excessive
loading
on
the
amplifier
output.
To
eliminate this excessive loading, it is preferable to
increase both Rg and Rf values, as shown in
Figure 71, and then achieve the input matching
Figure 72. DC-Coupled Single Supply Operation
impedance with a third resistor (RM) to ground. The
total input impedance is the parallel combination of
Rg and RM.
Copyright 2004–2009, Texas Instruments Incorporated
19
Product Folder Link(s): THS4281
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參數(shù)描述
THS4281DGKG4 功能描述:高速運(yùn)算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4281DGKR 功能描述:高速運(yùn)算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4281DGKRG4 功能描述:高速運(yùn)算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4281DR 功能描述:高速運(yùn)算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4281DRG4 功能描述:高速運(yùn)算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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