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参数资料
| 型号： | THS3061DG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 6/33页 |
| 文件大小： | 1015K |
| 代理商： | THS3061DG4 |
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_
+
Rf
RS
Rg
eRg
eRf
eRs
en
IN+
Noiseless
IN–
eni
eno
_
+
10
F
0.1
F
+12 V
499
+
VI+
_
+
10
F
0.1
F
–12 V
499
+
VI–
1:n
Telephone Line
THS3062(a)
RLine
210
0.1
F
THS3062(b)
RS
RLine
2n2
RLine
2n2
where
k = Boltzmann’s constant = 1.380658
× 10–23
T = Temperature in degrees Kelvin (273 +
°C)
Rf || Rg = Parallel resistance of Rf and Rg
e
ni +
en
2
) IN )
R
S
2
) IN *
R
f
Rg
2
) 4 kTRs ) 4 kT Rf Rg
eno + eni AV + eni 1 )
R
f
Rg
(Noninverting Case)
SLOS394B – JULY 2002 – REVISED NOVEMBER 2009
www.ti.com
Figure 49. Noise Model
space
Figure 48. Simple Line Driver With THS3062
space
Due to the high supply voltages and the large
The total equivalent input noise density (eni) is
current-drive capability, the power dissipation of the
calculated by using the following equation:
amplifier must be carefully considered. To have as
much power dissipation as possible in a small
package, the THS3062 is available only in a MSOP-8
PowerPAD package (DGN), and an even lower
thermal-impedance
SOIC-8
PowerPAD
package
(DDA). The thermal impedance of a standard SOIC
To calculate the equivalent output noise of the
package is too large to allow useful applications with
amplifier, multiply the equivalent input noise density
up to 30 V across the power-supply terminals with
(eni) by the overall amplifier gain (AV).
this dual amplifier. But the THS3061 (a single
amplifier) can be used in the standard SOIC package.
Again, the amplifier power dissipation must be
carefully examined, or else the amplifiers could
overheat, severely degrading performance. See the
As the previous equations show, to keep noise at a
minimum, small value resistors should be used. As
section for more information on thermal management.
the closed-loop gain is increased (by reducing RF and
RG), the input noise is reduced considerably because
NOISE CALCULATIONS
of the parallel resistance term. This leads to the
Noise can cause errors on very small signals. This is
general conclusion that the most dominant noise
especially true for amplifying small signals coming
sources are the source resistor (RS) and the internal
over a transmission line or an antenna. The noise
amplifier
noise
voltage
(en). Because noise is
model for current-feedback amplifiers (CFB) is the
summed in a root-mean-squares method, noise
same as for voltage feedback amplifiers (VFB). The
sources smaller than 25% of the largest noise source
only
difference
between
the
two
is
that
CFB
can be effectively ignored. This can greatly simplify
amplifiers generally specify different current-noise
the formula and make noise calculations much easier.
parameters for each input, while VFB amplifiers
usually only specify one noise-current parameter. The
PCB LAYOUT TECHNIQUES
noise model is shown in Figure 49. This model
FOR OPTIMAL PERFORMANCE
includes all of the noise sources as follows:
Achieving optimum performance with high-frequency
en = Amplifier internal voltage noise (nV/
√Hz)
devices in the THS306x family requires careful
IN+ = Noninverting current noise (pA/
√Hz)
attention to board layout, parasitic effects, and
IN– = Inverting current noise (pA/
√Hz)
external component types.
eRx = Thermal voltage noise associated with each
Recommendations to optimize performance include:
resistor (eRx = 4 kTRx)
14
Copyright 2002–2009, Texas Instruments Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| THS3061DGNR | 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8 |
| THS3061DGN | 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8 |
| THS3061DR | 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8 |
| THS3061D | 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8 |
| THS3061DGNG4 | 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| THS3061DGN | 功能描述:高速运算放大器 Hi-Vltg Hi-Slew-Rate Current Feedback 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 |
| THS3061DGNG4 | 功能描述:高速运算放大器 Hi-Vltg Hi-Slew-Rate Current Feedback 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 |
| THS3061DGNR | 功能描述:高速运算放大器 Hi-Vltg Hi-Slew-Rate Current Feedback 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 |
| THS3061DGNRG4 | 功能描述:高速运算放大器 Hi-Vltg Hi-Slew-Rate Current Feedback 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 |
| THS3061DR | 功能描述:高速运算放大器 Hi-Vltg Hi-Slew-Rate Current Feedback 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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