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參數資料
| 型號： | THS7364IPWR |
| 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, PLASTIC, TSSOP-20 |
| 文件頁數： | 31/47頁 |
| 文件大小： | 1134K |
| 代理商： | THS7364IPWR |
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www.ti.com
SBOS530 – AUGUST 2010
series resistor, and the filter) must be better than 75
drive at least 1.25 VP (100% saturation CVBS)/37.5
, +/-9 . The THS7364 is an operational amplifier
= 33.3 mA. A DAC is a current-steering element, and
that approximates an ideal voltage source, which is
this amount of current flows internally to the DAC
desirable because the output impedance is very low
even if the output is 0 V. Thus, power dissipation in
and can source and sink current. To properly match
the DAC may be very high, especially when six
the transmission line characteristic impedance of a
channels are being driven. Using the THS7364 with a
video line, a 75-
series resistor is placed on the
high input impedance and the capability to drive up to
output. To minimize reflections and to maintain a
two video lines per channel can reduce DAC power
good return loss meeting EIA/CEA specifications, this
dissipation significantly. This outcome is possible
output impedance must maintain a 75-
impedance.
because the resistance that the DAC drives can be
A wide impedance variation of a passive filter cannot
substantially increased. It is common to set this
ensure this level of performance. On the other hand,
resistance in a DAC by a current-setting resistor on
the THS7364 has approximately 0.9
of output
the DAC itself. Thus, the resistance can be 300
or
impedance, or a return loss of 44 dB, at 6.75 MHz for
more,
substantially
reducing
the
current
drive
the SD filters and approximately 9
of output
demands from the DAC and saving significant
impedance, or a return loss of 25 dB, at 60 MHz for
amounts of power. For example, a 3.3-V, six-channel
the FHD filters. Thus, the system is matched
DAC dissipates 660 mW alone for the steering
significantly better with a THS7364 compared to a
current capability (six channels × 33.3 mA × 3.3 V) if
passive filter.
it must drive a 37.5-
load. With a 300- load, the
DAC power dissipation as a result of current steering
One final benefit of the THS7364 over a passive filter
current would only be 82 mW (six channels ×
is power dissipation. A DAC driving a video line must
4.16 mA × 3.3 V).
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
Copyright 2010, Texas Instruments Incorporated
37
Product Folder Link(s): THS7364
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相關代理商/技術參數 |
參數描述 |
|---|---|
| THS7365 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-Channel Video Amplifier with 3-SD and 3-HD Sixth-Order Filters and 6-dB Gain |
| THS7365EVM | 功能描述:放大器 IC 開發工具 THS7365EVM Eval Mod RoHS:否 制造商:International Rectifier 產品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| THS7365IPW | 功能描述:視頻放大器 6Ch Video Amp RoHS:否 制造商:ON Semiconductor 通道數量: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 |
| THS7365IPWR | 功能描述:視頻放大器 6Ch Video Amp RoHS:否 制造商:ON Semiconductor 通道數量: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 |
| THS7368 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-Channel Video Amplifier with 3-SD and 3-SD/ED/HD/Full-HD Filters and 6-dB Gain |
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