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參數(shù)資料
| 型號： | LMH6504MMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Wideband, Low Power, Variable Gain Amplifier |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 13/19頁 |
| 文件大?。?/td> | 759K |
| 代理商： | LMH6504MMX |
Application Information
(Continued)
Eq. 3
Where K = 0.965 (nominal) N = 0.96V & V
C
= 80mV
@
room
temperature
For a V
G
range, the value specified in the tables represents
the worst case accuracy over the entire range. The "Typical"
value would be the worst case difference between the "Typi-
cal gain" and the "Theoretical gain". The "Max" value would
be the worst case difference between the actual gain and the
"Theoretical gain" for the entire population.
GAIN MATCHING
Gain matching as the limit on gain variation at a certain V
G
(expressed in dB) (see
Figure 2
) and is specified as "Max"
only (no "Typical"). For a V
range, the value specified
represents the worst case matching over the entire range.
The "Max" value would be the worst case difference between
the actual gain and the typical gain for the entire population.
GAIN PARTITIONING
If high levels of gain are needed, gain partitioning should be
considered:
The maximum gain range for this circuit is given by the
following equation:
Eq. 4
The LMH6624 is a low noise wideband voltage feedback
amplifier. Setting R
2
at 909
and R
1
at 100
produces a
gain of 20 dB. Setting R
F
at 1000
as recommended and R
G
at 50
, produces a gain of about 26 dB in the LMH6504. The
total gain of this circuit is therefore approximately 46 dB. It is
important to understand that when partitioning to obtain high
levels of gain, very small signal levels will drive the amplifiers
to full scale output. For example, with 46 dB of gain, a 20 mV
signal at the input will drive the output of the LMH6624 to 200
mV, the output of the LMH6504 to 4V. Accordingly, the
designer must carefully consider the contributions of each
stage to the overall characteristics. Through gain partitioning
the designer is provided with an opportunity to optimize the
frequency response, noise, distortion, settling time, and
loading effects of each amplifier to achieve improved overall
performance.
LMH6504 GAIN CONTROL RANGE AND MINIMUM GAIN
Before discussing Gain Control Range, it is important to
understand the issues which limit it. The minimum gain of the
LMH6504, theoretically, is zero, but in practical circuits is
limited by the amount of feedthrough, here defined as the
gain when V
= 0V. Capacitive coupling through the board
and package as well as coupling through the supplies will
determine the amount of feedthrough. Even at DC, the input
signal will not be completely rejected. At high frequencies
feedthrough will get worse because of its capacitive nature.
At frequencies below 10 MHz, the feed through will be less
than 60 dB and therefore, it can be said that with A
VMAX
=
20 dB, the gain control range is 80 dB.
20084351
FIGURE 2. LMH6504 Gain Accuracy & Gain Matching
Defined
20084352
FIGURE 3. Gain Partitioning
L
www.national.com
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMH6504MMX/NOPB | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| LMH6505 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Wideband, Low Power, Linear-in-dB, Variable Gain Amplifier |
| LMH6505MA | 制造商:Texas Instruments 功能描述:IC VGA WIDEBAND POWERWISE SOIC8 制造商:Texas Instruments 功能描述:IC, VGA WIDEBAND, POWERWISE, SOIC8 制造商:Texas Instruments 功能描述:IC, VARIABLE GAIN AMP, 150MHZ, SOIC-8 |
| LMH6505MA/NOPB | 功能描述:特殊用途放大器 Variable Gain Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| LMH6505MAX | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
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