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| 型号： | THS4500IDGKG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 运算放大器 |
| 英文描述： | OP-AMP, 1000 uV OFFSET-MAX, 300 MHz BAND WIDTH, PDSO8 |
| 封装： | GREEN, PLASTIC, MSOP-8 |
| 文件页数： | 18/47页 |
| 文件大小： | 1203K |
| 代理商： | THS4500IDGKG4 |
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INTERFACING TO AN ANALOG-TO-DIGITAL
EXAMPLE ANALOG-TO-DIGITAL
+
VOCM
12-Bit/80MSPS
IN
5 V
CM
5 V
5
V
VS
10
m
F
0.1
m
F
10
m
F
0.1
m
F
THS4503
RF
CF
1
m
F
RG
0.1
m
F
RT
RS
ADS5410
RISO
-
www.ti.com .............................................................................................................................................................. SLOS350E – APRIL 2002 – REVISED MAY 2008
Decouple the V
OCM pin to eliminate the antenna
CONVERTER
effect. VOCM is a high-impedance node that can
act as an antenna. A large decoupling capacitor
The THS4500 family of amplifiers are designed
on this node eliminates this problem.
specifically
to
interface
to
today's
Know the input common-mode range. If the input
highest-performance ADCs. This section highlights
signal
is
referenced
around
the
negative
the key concerns when interfacing to an ADC and
power-supply rail (for example, around ground on
provides example interface circuits.
a single 5 V supply), then the THS4500/1
There
are
several
key
design
concerns
when
accommodates the input signal. If the input signal
interfacing to an analog-to-digital converter:
is
referenced
around
midrail,
choose
the
THS4502/3 for the best operation.
Terminate
the
input
source
properly.
In
high-frequency receiver chains, the source that
Packaging makes a difference at higher
feeds the fully differential amplifier requires a
frequencies. If possible, choose the smaller,
specific load impedance (that is, 50
).
thermally-enhanced MSOP package for the best
performance.
As
a
rule,
lower
junction
Design a symmetric printed circuit board (PCB)
temperatures
provide
better
performance.
If
layout. Even-order distortion products are heavily
possible, use a thermally-enhanced package,
influenced by layout, and careful attention to a
even if the power dissipation is relatively small
symmetric
layout
minimizes
these
distortion
compared to the maximum power dissipation
products.
rating to achieve the best results.
Minimize inductance in power-supply decoupling
Understand the effect of the load impedance seen
traces
and
components.
Poor
power-supply
by the fully differential amplifier when performing
decoupling can have a dramatic effect on circuit
system-level intercept point calculations. Lighter
performance. Since the outputs are differential,
loads (such as those presented by an ADC) allow
differential currents exist in the power-supply pins.
smaller intercept points to support the same level
Thus, decoupling capacitors should be placed in a
of intermodulation distortion performance.
manner that minimizes the impedance of the
current loop.
Use separate analog and digital power supplies
CONVERTER DRIVER CIRCUITS
and grounds. Noise (bounce) in
the
power
supplies (created by digital switching currents) can
The THS4500 family of devices is designed to drive
couple
directly
into
the
signal
path,
and
high-performance ADCs with extremely high linearity,
power-supply noise can create higher distortion
allowing for the maximum effective number of bits at
products as well.
the output of the data converter. Two representative
Use care when filtering. While an RC low-pass
circuits shown below highlight single-supply operation
filter may be desirable on the output of the
and split supply operation, respectively. Specific
amplifier to filter broadband noise, the excess
feedback
resistor,
gain
resistor,
and
feedback
loading
can
negatively
impact
the
amplifier
capacitor values are not shown, as these values
linearity. Filtering in the feedback path does not
depend on the frequency of interest. Information on
have this effect.
calculating
these
values
can
be
found
in
the
applications material above.
AC-coupling allows easier circuit design. If
dc-coupling is required, be aware of the excess
power
dissipation
that
can
occur
due
to
level-shifting
the
output
through
the
output
common-mode voltage control.
Do not terminate the output unless required. Many
open-loop,
class-A
amplifiers
require
50-
termination for proper operation, but closed-loop
fully differential amplifiers drive a specific output
voltage regardless of the load impedance present.
Terminating the output of a fully differential
amplifier with a heavy load adversely affects the
amplifier linearity.
Comprehend the V
OCM input drive requirements.
Determine if the ADC voltage reference can
provide the required amount of current to move
Figure 101. Using the THS4503 With the ADS5410
VOCM to the desired value. A buffer may be
needed.
Copyright 2002–2008, Texas Instruments Incorporated
25
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS4500IDGKR | 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| THS4500IDGKRG4 | 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| THS4500IDGN | 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| THS4500IDGNG4 | 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| THS4500IDGNR | 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
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