參數(shù)資料
型號(hào)： OPA847IDBVR
英文描述： Wideband, Ultra-Low Noise, Voltage-Feedback
中文描述： 寬帶，超低噪聲，電壓反饋
文件頁(yè)數(shù)： 15/23頁(yè)
文件大?。?/td> 529K
代理商： OPA847IDBVR
OPA847
SBOS251C
15
www.ti.com
OPA847 can support this mode of operation down to a single
supply of +5V and up to a single supply of +12V. If shutdown
is desired for single-supply operation, it is important to
realize that the shutdown pin is referenced from the positive
supply pin. Open collector (drain) interfaces are suggested
for single-supply operation above +5V.
DESIGN-IN TOOLS
DEMONSTRATION BOARDS
Two PC boards are available to assist in the initial evaluation
of circuit performance using the OPA847 in its two package
styles. Both of these are available, free, as unpopulated PC
boards delivered with descriptive documentation. The sum-
mary information for these boards is shown in Table I.
Contact your sales representative or go to the TI web site
(www.ti.com) to request these evaluation boards.
amplifiers in this configuration has significantly reduced the
2nd-
harmonic, even after doubling the output voltage swing (to 4V
PP
)
and the gain (to 40V/V).
SINGLE-SUPPLY OPERATION
The OPA847 can be operated from a single power supply if
system constraints require it. Operation from a single +5V to
+12V supply is possible with minimal change in AC perfor-
mance. The Typical Characteristics show the input and
output voltage ranges for a bipolar supply range from ±2.5V
to ±6.0V. The Common-Mode Input Range and Output Swing
vs Supply Voltage curve shows that the required headroom
on both the input and output pins remains at approximately
1.5V over this entire range. On a single +5V supply, for
instance, this means the noninverting input should remain
centered at +2.5V ± 1V, as should the output pin. Figure 11
shows an example application biasing the noninverting input
at mid-supply and running an AC-coupled input to the invert-
ing gain path. Since the gain resistor is blocked off for DC,
the bias point on the noninverting input appears at the output,
centering up the output as well as on the power supply. The
FIGURE 10. Differential Distortion vs Frequency.
–65
–75
–85
–95
–105
–115
Frequency (MHz)
H
1
10
100
2nd-Harmonic
G
D
= 40V/V
R
L
= 400
V
O
= 4V
PP
3rd-Harmonic
FIGURE 11. Single-Supply Inverting Amplifier.
R
F
Power-supply decoupling
not shown.
Range
2R
F
2R
F
0.01
μ
F
R
G
V
I
OPA847
+V
CC
+12V
+5V
V
O
=
V
DIS
– V
I
V
CC
2
R
F
R
G
BOARD
PART
NUMBER
LITERATURE
REQUEST
NUMBER
PRODUCT
PACKAGE
OPA847ID
OPA847IDBV
SO-8
SOT23-6
DEMOPA68XU
DEMOPA6XXN
SBOU009
SBOU010
TABLE I. Demo Board Part Numbers.
MACROMODELS AND APPLICATIONS SUPPORT
Computer simulation of circuit performance using SPICE is
often a quick way to analyze the performance of the OPA847
in its intended application. This is particularly true for video
and RF amplifier circuits where parasitic capacitance and
inductance can play a major role in circuit performance. A
SPICE model for the OPA847 is available through the TI web
site (www.ti.com). These models do a good job of predicting
small-signal AC and transient performance under a wide
variety of operating conditions. They do not do as well in
predicting the harmonic distortion characteristics. These
models do not attempt to distinguish between the package
types in their small-signal AC performance.
OPERATING SUGGESTIONS
SETTING RESISTOR VALUES TO MINIMIZE NOISE
The OPA847 provides a very low input noise voltage while
requiring a low 18.1mA of quiescent current. To take full
advantage of this low input noise, careful attention to the other
possible noise contributors is required. See Figure 12 for the
op amp noise analysis model with all the noise terms included.
In this model, all the noise terms are taken to be noise voltage
or current density terms in either nV/
√
Hz
or pA/
√
Hz
.
The total output spot noise voltage is computed as the
square root of the squared contributing terms to the output
noise power. This computation adds all the contributing noise
powers at the output by superposition, then takes the square
相關(guān)PDF資料
PDF描述
OPA847IDBVT Wideband, Ultra-Low Noise, Voltage-Feedback
OPA847IDR Wideband, Ultra-Low Noise, Voltage-Feedback
OPAMP1EVB Op Amp Evaluation Board Manual SOT23, SC70, and SOIC8 Package
OPAMP3EVB Op Amp Evaluation Board Manual TSSOP−16 Package
OPB10100-SERIES Optoelectronic
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OPA847IDBVRG4 功能描述:高速運(yùn)算放大器 Wdebnd Ult-Lo Noise 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
OPA847IDBVT 功能描述:高速運(yùn)算放大器 Wdebnd Ult-Lo Noise 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
OPA847IDBVT 制造商:Texas Instruments 功能描述:OP AMP WIDEBAND VFB SOT-23-6 847
OPA847IDBVT 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC
OPA847IDBVTG4 功能描述:高速運(yùn)算放大器 Wdebnd Ult-Lo Noise 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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