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参数资料
| 型号： | THS3201MDEP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 13/29页 |
| 文件大小： | 709K |
| 代理商： | THS3201MDEP |
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f
P +
1
2pRC
2 x R
DAC Driver Application
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
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
SGLS283B – APRIL 2005 – REVISED JANUARY 2009 ..................................................................................................................................................... www.ti.com
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 bad
practice to place the pole at (or near) frequencies of
interest. At the pole frequency, the amplifiers see a
load with a magnitude of:
If R is only 10
, the amplifier is heavily loaded
above the pole frequency, and generates excessive
distortion.
The THS3201 can be used as a high-performance
DAC output driver in applications such as radio
transmitter
stages,
and
arbitrary
waveform
generators.
All
high-performance
DACs
have
Figure 61. Differential ADC Driver Circuit 2
differential current outputs. Two THS3201s can be
used as a differential drive amplifier in these
It is almost universally recommended to use a
applications as shown in Figure 62.
resistor
and
capacitor
between
the
operational
RPU on the DAC output is used to convert the output
amplifier output and the ADC input as shown in
current to voltage. The 24.9-
resistor and 47-pF
capacitor
between
each
DAC
output
and
the
This resistor-capacitor (RC) combination has multiple
operational amplifier input is used to reduce the
functions:
images generated at multiples of the sampling rate.
The values shown form a pole a 136 MHz. ROUT sets
The capacitor is a local charge reservoir for ADC.
the output impedance of each amplifier.
The resistor isolates the amplifier from the ADC.
In conjunction, they form a low-pass noise filter.
During the sampling phase, current is required to
charge the ADC input sampling capacitors. By placing
external capacitors directly at the input pins, most of
the current is drawn from them. They are seen as a
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 62. Differential DAC Driver Circuit
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:
20
Copyright 2005–2009, Texas Instruments Incorporated
Product Folder Link(s): THS3201-EP
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS3201MDEP(1) | 制造商:TI 制造商全称:Texas Instruments 功能描述:1.8-GHz LOW-DISTORTION CURRENT-FEEDBACK AMPLIFIER |
| THS3201MDGNEP(1) | 制造商:TI 制造商全称:Texas Instruments 功能描述:1.8-GHz LOW-DISTORTION CURRENT-FEEDBACK AMPLIFIER |
| THS3201MDGNREP | 功能描述:高速运算放大器 Mil Enhance 1.8GHz Feedback Amp 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 |
| THS3201MDREP(1) | 制造商:TI 制造商全称:Texas Instruments 功能描述:1.8-GHz LOW-DISTORTION CURRENT-FEEDBACK AMPLIFIER |
| THS3202 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW-DISTORTION HIGH-SPEED VOLTAGE FEEDBACK AMPLIFIER |
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