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参数资料
| 型号： | THS3201DBVTG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO5 |
| 封装： | GREEN, PLASTIC, SOT-23, 5 PIN |
| 文件页数： | 10/37页 |
| 文件大小： | 1116K |
| 代理商： | THS3201DBVTG4 |
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f
P +
1
2pRC
2 x R
THS3201
47pF
CM
ADC
47pF
1:n
24.9
0.1
F
RF
RG
VS-
VS+
24.9
0.1
F
0.1
F
VIN
RT
RG
RF
DAC DRIVER APPLICATION
IOUT2
DAC
IOUT1
THS3201
47pF
24.9
VS+
RF
RG
0.1
F
ROUT
VOUT1
VOUT2
ROUT
VS-
0.1
F
RF
RG
24.9
AVDD
RPU
0.1
F
SLOS416C – JUNE 2003 – REVISED JUNE 2009 ............................................................................................................................................................. www.ti.com
Typically, a low value resistor in the range of 10
to
100
provides the required isolation. Together, the
R and C form a real pole in the s-plane located at the
frequency:
Placing this pole at about 10x the highest frequency
of interest ensures it has no impact on the signal.
Since the resistor is typically a small value, it is very
bad practice to place the pole at (or very near)
frequencies of interest. At the pole frequency, the
amplifiers sees a load with a magnitude of:
If R is only 10
, the amplifier is very heavily loaded
above the pole frequency, and generates excessive
distortion.
Figure 60. Differential ADC Driver Circuit 2
The THS3201 can be used as a high-performance
DAC output driver in applications like radio transmitter
It is almost universally recommended to use a
stages
and
arbitrary
waveform
generators.
All
resistor and capacitor between the op amp output
high-performance DACs have differential current
and the ADC input as shown in both figures.
outputs. Two THS3201s can be used as a differential
drive amplifier in these applications, as shown in
This resistor-capacitor (RC) combination has multiple
functions:
The capacitor is a local charge reservoir for ADC
RPU on the DAC output is used to convert the output
current to voltage. The 24.9-
resistor and 47-pF
The resistor isolates the amplifier from the ADC
capacitor between each DAC output and the op amp
In conjunction, they form a low-pass noise filter
input is used to reduce the images generated at
During the sampling phase, current is required to
multiples of the sampling rate. The values shown
charge the ADC input sampling capacitors. By placing
form a pole at 136 MHz. ROUT sets the output
external capacitors directly at the input pins, most of
impedance of each amplifier.
the current is drawn from them. They are seen as a
very low impedance source. They can be thought of
as
serving
much
the
same
purpose
as
a
power-supply bypass capacitor to supply transient
current, with the amplifier then providing the bulk
charge.
Typically, a low-value capacitor in the range of 10 pF
to 100 pF provides the required transient charge
reservoir.
The capacitance and the switching action of the ADC
is one of the worst loading scenarios that a
high-speed
amplifier
encounters.
The
resistor
provides a simple means of isolating the associated
phase
shift
from
the
feedback
network
and
maintaining the phase margin of the amplifier.
Figure 61. Differential DAC Driver Circuit
18
Copyright 2003–2009, Texas Instruments Incorporated
Product Folder Link(s): THS3201
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| THS3201DGK | 功能描述:高速运算放大器 1.8GHz Current Feedback Amplifier 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 |
| THS3201DGKG4 | 功能描述:高速运算放大器 1.8GHz Current Feedback Amplifier 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 |
| THS3201DGKR | 功能描述:高速运算放大器 1.8GHz Current Feedback Amplifier 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 |
| THS3201DGKRG4 | 功能描述:高速运算放大器 1.8GHz Current Feedback Amplifier 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 |
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