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參數(shù)資料
| 型號： | THS7368IPWR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 6 CHANNEL, VIDEO AMPLIFIER, PDSO20 |
| 封裝： | GREEN, TSSOP-20 |
| 文件頁數(shù)： | 24/40頁 |
| 文件大?。?/td> | 1123K |
| 代理商： | THS7368IPWR |
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SBOS497 – DECEMBER 2009
www.ti.com
source impedance (which includes the source, series
drive at least 1.25 VP (100% saturation CVBS)/37.5
resistor, and the filter) must be better than 75
,
= 33.3 mA. A DAC is a current-steering element, and
+9/–8
. The THS7368 is an operational amplifier
this amount of current flows internally to the DAC
that approximates an ideal voltage source, which is
even if the output is 0 V. Thus, power dissipation in
desirable because the output impedance is very low
the DAC may be very high, especially when six
and can source and sink current. To properly match
channels are being driven. Using the THS7368 with a
the transmission line characteristic impedance of a
high input impedance and the capability to drive up to
video line, a 75-
series resistor is placed on the
two video lines per channel can reduce DAC power
output. To minimize reflections and to maintain a
dissipation significantly. This outcome is possible
good return loss meeting EIA specifications, this
because the resistance that the DAC drives can be
output impedance must maintain a 75-
impedance.
substantially increased. It is common to set this
A wide impedance variation of a passive filter cannot
resistance in a DAC by a current-setting resistor on
ensure this level of performance. On the other hand,
the DAC itself. Thus, the resistance can be 300
or
the THS7368 has approximately 0.7
of output
more,
substantially
reducing
the
current
drive
impedance, or a return loss of 46 dB, at 6.75 MHz for
demands from the DAC and saving significant
the SD filters and approximately 1.7
of output
amounts of power. For example, a 3.3-V, six-channel
impedance, or a return loss of 39 dB, at 30 MHz for
DAC dissipates 660 mW alone for the steering
the SF-HD filters. Thus, the system is matched
current capability (six channels × 33.3 mA × 3.3 V) if
significantly better with a THS7368 compared to a
it must drive a 37.5-
load. With a 300- load, the
passive filter.
DAC power dissipation as a result of current steering
current would only be 82 mW (six channels × 4.16
One final benefit of the THS7368 over a passive filter
mA × 3.3 V).
is power dissipation. A DAC driving a video line must
be able to drive a 37.5-
load: the receiver 75-
resistor and the 75-
impedance matching resistor
next to the DAC to maintain the source impedance
requirement. This requirement forces the DAC to
30
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): THS7368
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| THS7368IPW | 6 CHANNEL, VIDEO AMPLIFIER, PDSO20 |
| THS7372IPWR | 4 CHANNEL, VIDEO AMPLIFIER, PDSO14 |
| THS7372IPW | 4 CHANNEL, VIDEO AMPLIFIER, PDSO14 |
| THS7374IPWR | 4 CHANNEL, VIDEO AMPLIFIER, PDSO14 |
| THS7374IPW | 4 CHANNEL, VIDEO AMPLIFIER, PDSO14 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS7371IPW | 制造商:Texas Instruments 功能描述:VIDEO OPAM - Rail/Tube |
| THS7371IPWR | 制造商:Texas Instruments 功能描述:VIDEO OPAM - Tape and Reel |
| THS7372 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-Channel Video Amplifier with One CVBS and Three Full-HD Filters with 6-dB Gain |
| THS7372IPW | 功能描述:視頻放大器 4CH 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 |
| THS7372IPWR | 功能描述:視頻放大器 4CH 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 |
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