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參數資料
| 型號： | LMH6570 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 2:1 High Speed Video Multiplexer |
| 中文描述： | 2:1高速視頻多路復用器 |
| 文件頁數： | 12/14頁 |
| 文件大小： | 831K |
| 代理商： | LMH6570 |
Other Applications
(Continued)
5 to 120 pF are the most critical, causing ringing, frequency
response peaking and possible oscillation. The chart “Sug-
gested R
OUT
vs. Cap Load” gives a recommended value for
selecting a series output resistor for mitigating capacitive
loads. The values suggested in the charts are selected for
0.5 dB or less of peaking in the frequency response. This
gives a good compromise between settling time and band-
width. For applications where maximum frequency response
is needed and some peaking is tolerable, the value of R
OUT
can be reduced slightly from the recommended values.
LAYOUT CONSIDERATIONS
Whenever questions about layout arise, use the evaluation
board as a guide. The LMH730277 is the evaluation board
supplied with samples of the LMH6570. To reduce parasitic
capacitances, ground and power planes should be removed
near the input and output pins. For long signal paths con-
trolled impedance lines should be used, along with imped-
ance matching elements at both ends. Bypass capacitors
should be placed as close to the device as possible. Bypass
capacitors from each rail to ground are applied in pairs. The
larger electrolytic bypass capacitors can be located farther
from the device, the smaller ceramic capacitors should be
placed as close to the device as possible. In
Figure 1
, the
capacitor between V
+
and V
is optional, but is recom-
mended for best second harmonic distortion. Another way to
enhance performance is to use pairs of 0.01μF and 0.1μF
ceramic capacitors for each supply bypass.
POWER DISSIPATION
The LMH6570 is optimized for maximum speed and perfor-
mance in the small form factor of the standard SOIC pack-
age. To ensure maximum output drive and highest perfor-
mance, thermal shutdown is not provided. Therefore, it is of
utmost importance to make sure that the T
JMAX
is never
exceeded due to the overall power dissipation.
Follow these steps to determine the maximum power dissi-
pation for the LMH6570:
1.
Calculate the quiescent (no-load) power: P
AMP
= I
CC
*
(V
S
), where V
S
= V
+
- V
.
2.
Calculate the RMS power dissipated in the output stage:
P
D
(rms) = rms ((V
- V
) * I
), where V
and
I
are the voltage across and the current through the
external load and V
S
is the total supply voltage.
3.
Calculate the total RMS power: P
T
= P
AMP
+ P
D
.
The maximum power that t-he LMH6570 package can dissi-
pate at a given temperature can be derived with the following
equation:
P
= (150 – T
AMB
)/
θ
, where T
= Ambient tempera-
ture (C) and
θ
= Thermal resistance, from junction to
ambient, for a given package (C/W). For the SOIC package
θ
JA
is 150 C/W.
20129924
FIGURE 6. Decoupling Capacitive Loads
20129915
FIGURE 7. Suggested R
OUT
vs. Capacitive Load
20129914
FIGURE 8. Frequency Response vs. Capacitive Load
L
www.national.com
12
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| LMH6574 | 4:1 High Speed Video Multiplexer |
| LMH6574MA | 4:1 High Speed Video Multiplexer |
| LMH6574MAX | 4:1 High Speed Video Multiplexer |
| LMH6622 | Dual Wideband, Low Noise, 160MHz, Operational Amplifiers |
| LMH6622MA | Dual Wideband, Low Noise, 160MHz, Operational Amplifiers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LMH6570MA | 功能描述:多路器開關 IC RoHS:否 制造商:Texas Instruments 通道數量:1 開關數量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| LMH6570MA/NOPB | 功能描述:多路器開關 IC RoHS:否 制造商:Texas Instruments 通道數量:1 開關數量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| LMH6570MAX | 功能描述:多路器開關 IC RoHS:否 制造商:Texas Instruments 通道數量:1 開關數量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| LMH6570MAX/NOPB | 功能描述:多路器開關 IC RoHS:否 制造商:Texas Instruments 通道數量:1 開關數量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| LMH6572 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Triple 2:1 High Speed Video Multiplexer |
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