參數(shù)資料
型號： THS4215DGNRG4
廠商： Texas Instruments, Inc.
英文描述： LOW-DISTORTION HIGH-SPEED VOLTAGE FEEDBACK AMPLIFIER
中文描述： 低失真高速電壓反饋型放大器
文件頁數(shù)： 19/41頁
文件大小： 1591K
代理商： THS4215DGNRG4
www.ti.com
APPLICATION INFORMATION
HIGH-SPEED OPERATIONAL AMPLIFIERS
The THS4211 and the THS4215 operational ampli-
fiers set new performance levels, combining low
distortion, high slew rates, low noise, and a unity-gain
bandwidth in excess of 1 GHz. To achieve the full
performance of the amplifier, careful attention must
be paid to printed-circuit board layout and component
selection.
Applications Section Contents
Wideband, Noninverting Operation
Wideband, Inverting Gain Operation
Single Supply Operation
Saving Power With Power-Down Functionality
and Setting Threshold Levels With the Reference
Pin
Power
Supply
Decoupling
Recommendations
Using the THS4211 as a DAC Output Buffer
Driving an ADC With the THS4211
Active Filtering With the THS4211
Building a Low-Noise Receiver With the THS4211
Linearity:
Definitions,
Techniques and Design Tradeoffs
An Abbreviated Analysis of Noise in Amplifiers
Driving Capacitive Loads
Printed-Circuit
Board
Optimal Performance
Power Dissipation and Thermal Considerations
Performance vs Package Options
Evaluation
Fixtures,
Applications Support
Additional Reference Material
Mechanical Package Drawings
+
THS4211
R
f
392
49.9
100 pF
0.1
μ
F
6.8
μ
F
+
-V
S
-5 V
R
g
50
Source
V
I
100 pF
0.1
μ
F
6.8
μ
F
+
+V
S
5 V
V
O
499
392
WIDEBAND, INVERTING GAIN OPERATION
Since
the
THS4211
eral-purpose, wideband voltage-feedback amplifiers,
several familiar operational-amplifier applications cir-
cuits are available to the designer. Figure 76 shows a
typical inverting configuration where the input and
output impedances and noise gain from Figure 75 are
retained in an inverting circuit configuration. Inverting
operation is a common requirement and offers sev-
eral performance benefits. The inverting configuration
shows improved slew rates and distortion due to the
pseudo-static voltage maintained on the inverting
input.
WIDEBAND, NONINVERTING OPERATION
The THS4211 and the THS4215 are unity-gain,
stable 1-GHz voltage-feedback operational amplifiers,
with and without power-down capability, designed to
operate from a single 5-V to 15-V power supply.
THS4211
THS4215
SLOS400D–SEPTEMBER 2002–REVISED NOVEMBER 2004
with measurement equipment presenting a 50-
load
impedance. In Figure 75, the 49.9-
shunt resistor at
the V
IN
terminal matches the source impedance of the
test generator. The total 499-
load at the output,
combined with the 784-
total feedback-network
load, presents the THS4211 and THS4215 with an
effective output load of 305
for the circuit shown in
Figure 75.
Voltage-feedback amplifiers, unlike current-feedback
designs, can use a wide range of resistors values to
set their gain with minimal impact on their stability
and frequency response. Larger-valued resistors de-
crease the loading effect of the feedback network on
the output of the amplifier, but this enhancement
comes at the expense of additional noise and poten-
tially lower bandwidth. Feedback-resistor values be-
tween 392
and 1 k
are recommended for most
applications.
The THS4215 provides a power-down mode, provid-
ing the ability to save power when the amplifier is
inactive. A reference pin is provided to allow the user
the flexibility to control the threshold levels of the
power-down control pin.
Techniques
and
Terminology,
Circuit
Figure 75. Wideband, Noninverting Gain
Configuration
Layout
Techniques
for
and
THS4215
are
gen-
Spice
Models,
and
Figure 75 shows the noninverting-gain configuration
of 2 V/V used to demonstrate the typical performance
curves. Most of the curves were characterized using
signal sources with 50-
source impedances, and
19
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THS4215DRBRG4 功能描述:高速運(yùn)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(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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