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參數(shù)資料
| 型號： | THS7374IPWR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 4 CHANNEL, VIDEO AMPLIFIER, PDSO14 |
| 封裝： | GREEN, PLASTIC, TSSOP-14 |
| 文件頁數(shù)： | 21/40頁 |
| 文件大?。?/td> | 929K |
| 代理商： | THS7374IPWR |
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SLOS590B – JULY 2008 – REVISED JANUARY 2011
www.ti.com
BiCom3X process. The filters have been specified by
impedance. A passive filter impedance variation
design
to
account
for
process
variations
and
cannot ensure this while the THS7374 has about
temperature
variations
to
maintain
proper
filter
0.7-
of output impedance at 5-MHz. Thus, the
characteristics. This architecture maintains a low
system is matched much better with a THS7374
channel-to-channel time delay, which is required for
compared to a passive filter.
proper video signal performance.
One final advantage of the THS7374 over a passive
Another benefit of the THS7374 over a passive RLC
filter is power dissipation. A DAC driving a video line
filter is the input and output impedance. The input
must be able to drive a 37.5-
load—the receiver
impedance presented to the DAC vary significantly,
75-
resistor and the 75- source impedance
from 35-
to over 1.5-k, with a passive network and
matching resistor next to the DAC to maintain the
may cause voltage variations over frequency. The
source impedance requirement. This approach forces
THS7374 input impedance is 800-k
and only the
the DAC to drive at least 1.25 VP (100% saturation
2-pF
input
capacitance
plus
the
PCB
trace
CVBS)/37.5
= 33.3 mA. A DAC is a current
capacitance impacting the input impedance. As such,
steering element and this amount of current flows
the voltage variation appearing at the DAC output is
internally to the DAC even if the output is 0-V. Thus,
better controlled with a fixed termination resistor and
power dissipation in the DAC may be very high,
the high input impedance buffer of the THS7374.
especially when four channels are being driven. With
a high input impedance and the capability to drive up
On the output side of the filter, a passive filter also
to two video lines, utilizing the THS7374 can reduce
has a large impedance variation over frequency,
the DAC power dissipation significantly. This occurs
again from 35-
to over 1.5-k. The THS7374 is an
because the resistance the DAC is driving can be
operational amplifier which approximates an ideal
substantially increased. It is common to set this in a
voltage
source.
A
voltage
source
is
desirable
DAC by a current setting resistor on the DAC. Thus,
because the output impedance is very low and can
the resistance can be 300-
or more, substantially
source and sink current. To properly match the
reducing the current drive demands from the DAC
transmission line characteristic impedance of a video
and saving a substantial amount of power. For
line, a 75-
series resistor is placed on the output. To
example, a 3.3-V four-channel DAC dissipates 440
minimize reflections and to maintain a good return
mW just for the steering current capability (four
loss, this output resistor must maintain a 75-
channels × 33.3 mA × 3.3 V) if it needs to drive
37.5-
load. With a 300- load, the DAC power
dissipation as a result of current steering current
would only be 55 mW (four channels × 4.16 mA ×
3.3 V).
28
Copyright 2008–2011, Texas Instruments Incorporated
Product Folder Link(s): THS7374
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| THS7374IPW | 4 CHANNEL, VIDEO AMPLIFIER, PDSO14 |
| THS7374IPWG4 | 4 CHANNEL, VIDEO AMPLIFIER, PDSO14 |
| THS7374IPWRG4 | 4 CHANNEL, VIDEO AMPLIFIER, PDSO14 |
| THS7375IPWR | VIDEO AMPLIFIER, PDSO14 |
| THS7375IPW | VIDEO AMPLIFIER, PDSO14 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS7374IPWRG4 | 功能描述:視頻放大器 4-Ch SDTV Video Amp RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| THS7375 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-Channel SDTV Video Amplifier with 6th-Order Filters and 5.6-V/V Gain |
| THS7375EVM | 功能描述:放大器 IC 開發(fā)工具 THS7375 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| THS7375IPW | 功能描述:視頻放大器 4Ch SDTV Video Amp RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| THS7375IPWG4 | 功能描述:視頻放大器 4Ch SDTV Video Amp w/6th order fltr RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
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