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參數(shù)資料
| 型號(hào)： | LMH6504 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Wideband, Low Power, Variable Gain Amplifier |
| 中文描述： | 寬帶，低功耗，可變?cè)鲆娣糯笃?/td> |
| 文件頁(yè)數(shù)： | 17/19頁(yè) |
| 文件大?。?/td> | 759K |
| 代理商： | LMH6504 |
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Application Information
(Continued)
CIRCUIT LAYOUT CONSIDERATIONS & EVALUATION
BOARD
A good high frequency PCB layout including ground plane
construction and power supply bypassing close to the pack-
age are critical to achieving full performance. The amplifier is
sensitive to stray capacitance to ground at the I
-
input (pin 7);
keep node trace area small. Shunt capacitance across the
feedback resistor should not be used to compensate for this
effect. Capacitance to ground should be minimized by re-
moving the ground plane from under the body of R
. Para-
sitic or load capacitance directly on the output (pin 6) de-
grades phase margin leading to frequency response
peaking.
The LMH6504 is fully stable when driving a 100
load. With
reduced load (e.g. 1k.) there is a possibility of instability at
very high frequencies beyond 400 MHz especially with a
capacitive load. When the LMH6504 is connected to a light
load as such, it is recommended to add a snubber network to
the output (e.g. 100
and 39 pF in series tied between the
LMH6504 output and ground). C
can also be isolated from
the output by placing a small resistor in series with the output
(pin 6).
Component parasitics also influence high frequency results.
Therefore it is recommended to use metal film resistors such
as RN55D or leadless components such as surface mount
devices. High profile sockets are not recommended.
National Semiconductor suggests the following evaluation
board as a guide for high frequency layout and as an aid in
device testing and characterization:
Device
Package
Evaluation Board
Part Number
CLC730066
LMH6504
SOIC
The evaluation board is shipped when a device sample
request is placed with National Semiconductor.
20084360
FIGURE 9. Automatic Gain Control Circuit #2
L
www.national.com
17
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMH6504MA | 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 |
| LMH6504MA/NOPB | 功能描述:特殊用途放大器 WB,Low Pwr,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 |
| LMH6504MAX | 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 |
| LMH6504MAX/E7000960 | 制造商:Texas Instruments 功能描述: |
| LMH6504MAX/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 |
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