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参数资料
| 型号： | THS4215DGK |
| 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： | GREEN, PLASTIC, MSOP-8 |
| 文件页数： | 18/47页 |
| 文件大小： | 1197K |
| 代理商： | THS4215DGK |
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OIP
3
+ PO )
IMD
3
2
where
P
O
+ 10 log
V2
P
2R
L
0.001
IMD3
OIP3
IIP3
3X
PIN
(dBm)
1X
POUT
(dBm)
PO
PS
_
+
Rf
4kT = 1.6E-20J
at 290K
THS4211/THS4215
IBN
EO
ERF
RS
ERS
IBI
Rg
ENI
4kTRS
4kT
Rg
4kTRf
E
O +
E 2
NI
) IBNRS
2
) 4kTRS NG
2 ) IBIRf
2
) 4kTRfNG
www.ti.com ................................................................................................................................... SLOS400E – SEPTEMBER 2002 – REVISED SEPTEMBER 2009
(2)
(3)
NOTE: PO is the output power of a single tone, RL is
the load resistance, and VP is the peak voltage for a
single tone.
NOISE ANALYSIS
High slew rate, unity-gain stable, voltage-feedback
operational amplifiers usually achieve their slew rate
at the expense of a higher input noise voltage. The
7-nV/
√Hz input voltage noise for the THS4211 and
THS4215 is, however, much lower than comparable
amplifiers. The input-referred voltage noise and the
two input-referred current noise terms (4 pA/
√Hz)
combine to give low output noise under a wide variety
Figure 86.
of operating conditions. Figure 87 shows the amplifier
noise analysis model with all the noise terms
included. In this model, all noise terms are taken to
Due to the intercept point's ease of use in system
be noise voltage or current density terms in either
level calculations for receiver chains, it has become
nV/
√Hz or pA/√Hz.
the
specification
of
choice
for
guiding
distortion-related
design
decisions.
Traditionally,
these systems use primarily class-A, single-ended RF
amplifiers as gain blocks. These RF amplifiers are
typically designed to operate in a 50-
environment.
Giving intercept points in dBm implies an associated
impedance (50
).
However, with an operational amplifier, the output
does not require termination as an RF amplifier
would. Because closed-loop amplifiers deliver signals
to their outputs regardless of the impedance present,
it is important to comprehend this when evaluating
the intercept point of an operational amplifier. The
THS4211 yields optimum distortion performance
when loaded with 150
to 1 k, very similar to the
Figure 87. Noise Analysis Model
input impedance of an analog-to-digital converter
over its input frequency band.
The total output shot noise voltage can be computed
As a result, terminating the input of the ADC to 50
as the square of all square output noise voltage
can actually be detrimental to system performance.
contributors. Equation 4 shows the general form for
The
discontinuity
between
open-loop,
class-A
the output noise voltage using the terms shown in
amplifiers
and
closed-loop,
class-AB
amplifiers
becomes apparent when comparing the intercept
points of the two types of devices. Equation 2 and
Equation 3 define an intercept point, relative to the
(4)
intermodulation distortion.
Copyright 2002–2009, Texas Instruments Incorporated
25
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS4215DGKG4 | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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 |
| THS4215DGKR | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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 |
| THS4215DGKRG4 | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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 |
| THS4215DGN | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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 |
| THS4215DGNG4 | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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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