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参数资料
| 型号： | THS7365IPW |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 6 CHANNEL, VIDEO AMPLIFIER, PDSO20 |
| 封装： | PLASTIC, TSSOP-20 |
| 文件页数： | 37/52页 |
| 文件大小： | 1599K |
| 代理商： | THS7365IPW |
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SBOS467 – MARCH 2009.................................................................................................................................................................................................. www.ti.com
Another benefit of the THS7365 over a passive RLC
the SD filters and approximately 1.7
of output
filter is the input and output impedance. The input
impedance, or a return loss of 39 dB, at 30 MHz for
impedance presented to the DAC varies significantly,
the
HD
filters.
Thus,
the
system
is
matched
from 35
to over 1.5 k with a passive network, and
significantly better with a THS7365 compared to a
may cause voltage variations over frequency. The
passive filter.
THS7365 input impedance is 800 k
, and only the
One final benefit of the THS7365 over a passive filter
2-pF
input
capacitance
plus
the
PCB
trace
is power dissipation. A DAC driving a video line must
capacitance impact the input impedance. As such,
be able to drive a 37.5-
load: the receiver 75-
the voltage variation appearing at the DAC output is
resistor and the 75-
impedance matching resistor
better controlled with a fixed termination resistor and
next to the DAC to maintain the source impedance
the high input impedance buffer of the THS7365.
requirement. This requirement forces the DAC to
On the output side of the filter, a passive filter again
drive at least 1.25 VP (100% saturation CVBS)/37.5
has a large impedance variation over frequency. The
= 33.3 mA. A DAC is a current-steering element, and
EIA770 specifications require the return loss to be at
this amount of current flows internally to the DAC
least 25 dB over the video frequency range of usage.
even if the output is 0 V. Thus, power dissipation in
For a video system, this requirement implies the
the DAC may be very high, especially when six
source impedance (which includes the source, series
channels are being driven. Using the THS7365 with a
resistor, and the filter) must be better than 75
,
high input impedance and the capability to drive up to
+9/–8
. The THS7365 is an operational amplifier
two video lines per channel can reduce DAC power
that approximates an ideal voltage source, which is
dissipation significantly. This outcome is possible
desirable because the output impedance is very low
because the resistance that the DAC drives can be
and can source and sink current. To properly match
substantially increased. It is common to set this
the transmission line characteristic impedance of a
resistance in a DAC by a current-setting resistor on
video line, a 75-
series resistor is placed on the
the DAC itself. Thus, the resistance can be 300
or
output. To minimize reflections and to maintain a
more,
substantially
reducing
the
current
drive
good return loss meeting EIA specifications, this
demands from the DAC and saving significant
output impedance must maintain a 75-
impedance.
amounts of power. For example, a 3.3-V, six-channel
A wide impedance variation of a passive filter cannot
DAC dissipates 660 mW alone for the steering
ensure this level of performance. On the other hand,
current capability (six channels × 33.3 mA × 3.3 V) if
the THS7365 has approximately 0.7
of output
it must drive a 37.5-
load. With a 300- load, the
impedance, or a return loss of 46 dB, at 6.75 MHz for
DAC power dissipation as a result of current steering
current would only be 82 mW (six channels × 4.16
mA × 3.3 V).
42
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): THS7365
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS7365IPWR | 功能描述:视频放大器 6Ch Video Amp RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| THS7368 | 制造商:TI 制造商全称: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 |
| THS7368EVM | 功能描述:放大器 IC 开发工具 THS7368EVM Eval Mod RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| THS7368IPW | 功能描述:视频放大器 6-Ch Video Amp RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| THS7368IPW | 制造商:Texas Instruments 功能描述:Video Amplifier IC 制造商:Texas Instruments 功能描述:IC, VIDEO AMPLIFIER, HEX, 350MHZ TSSOP20 |
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