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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： | 36/52页 |
| 文件大小： | 1599K |
| 代理商： | THS7365IPW |
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BENEFITS OVER PASSIVE FILTERING
www.ti.com.................................................................................................................................................................................................. SBOS467 – MARCH 2009
The THS7365 SD filters have a nominal corner
Bypassing the HD filters results in a amplifier
(–3 dB) frequency at 9.5MHz and a –1-dB passband
supporting 250-MHz bandwidth and 500-V/
s slew
typically at 8.2MHz. This 9.5-MHz filter is ideal for SD
rate. This configuration supports 1080p60 signals and
NTSC, PAL, and SECAM composite video (CVBS)
also
computer
R'G'B'
signals
up
to
UWXGA
signals. It is also useful for S-Video signals (Y’C’),
resolution.
480i/576i Y’/P’B/P’R, Y’U’V’, broadcast G’B’R’ signals,
and computer R'G'B' video signals. The 9.5-MHz,
–3-dB corner frequency was designed to achieve 54
dB of attenuation at 27 MHz—a common sampling
Two key benefits of using an integrated filter system,
frequency between the DAC/ADC second and third
such as the THS7365, over a passive system are
Nyquist zones found in many video systems. This
PCB area and filter variations. The small TSSOP-20
consideration is important because any signal that
package for six video channels is much smaller over
appears around this frequency can also appear in the
a passive RLC network, especially a six-pole passive
baseband as a result of aliasing effects of an ADC
network. Additionally, consider that inductors have at
found in a receiver.
best ±10% tolerances (normally, ±15% to ±20% is
common)
and
capacitors
typically
have
±10%
The THS7365 HD filters have a nominal corner
tolerances. Using a Monte Carlo analysis shows that
(–3 dB) frequency at 36MHz and a –1-dB passband
the filter corner frequency (–3 dB), flatness (–1 dB), Q
typically at 32MHz. This 36-MHz filter is ideal for HD
factor (or peaking), and channel-to-channel delay
720p, 1080i, up to 1080p30 Y’/P’B/P’R, broadcast
have wide variations. These variances can lead to
G’B’R’ signals, and computer R’G’B’ video signals up
potential
performance
and
quality
issues
in
to XGA. The 36-MHz, –3-dB corner frequency was
mass-production environments. The THS7365 solves
designed to achieve 42 dB of attenuation at 74.25
most of these problems with the corner frequency
MHz—a common sampling frequency between the
being essentially the only variable.
DAC/ADC second and third Nyquist zones found in
many video systems.
Another concern about passive filters is the use of
inductors. Inductors are magnetic components, and
Keep in mind that images do not stop at the DAC
are
therefore
susceptible
to
electromagnetic
sampling frequency, fS (for example, 27 MHz for
coupling/interference
(EMC/EMI).
Some
common
traditional SD DACs); they continue around the
coupling can occur because of other video channels
sampling frequencies of 2x fS, 3x fS, 4x fS, and so on
nearby using inductors for filtering, or it can come
(that is, 54-MHz, 81-MHz, 108-MHz, etc.). Because of
from nearby switched-mode power supplies. Some
these multiple images, an ADC can fold down into the
other forms of coupling could be from outside sources
baseband signal, meaning that the low-pass filter
with strong EMI radiation and can cause failure in
must also eliminate these higher-order images. The
EMC testing such as required for CE compliance.
THS7365 filters are Butterworth filters and, as such,
do not bounce at higher frequencies, thus maintaining
One concern about an active filter in an integrated
good attenuation performance.
circuit is the variation of the filter characteristics when
the ambient temperature and the subsequent die
The filter frequencies were chosen to account for
temperature
changes.
To
minimize
temperature
process variations in the THS7365. To ensure the
effects,
the
THS7365
uses
low-temperature
required video frequencies are effectively passed, the
coefficient resistors and high-quality, low-temperature
filter corner frequency must be high enough to allow
coefficient capacitors found in the BiCom3X process.
component variations. The other consideration is that
These filters have been specified by design to
the attenuation must be large enough to ensure the
account for process variations and temperature
anti-aliasing/reconstruction filtering is sufficient to
variations to maintain proper filter characteristics.
meet the system demands. Thus, the selection of the
This approach maintains a low channel-to-channel
filter frequencies was not arbitrarily selected and is a
time delay that is required for proper video signal
good compromise that should meet the demands of
performance.
most systems.
One of the features of the THS7365 is that these
filters can be bypassed. Bypassing the SD filters
results in an amplifier with 130-MHz bandwidth and
100-V/
s slew rate. This configuration can be helpful
when diagnosing potential system issues or when
simply wishing to pass higher frequency signals
through the system.
Copyright 2009, Texas Instruments Incorporated
41
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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