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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： | 35/52页 |
| 文件大小： | 1599K |
| 代理商： | THS7365IPW |
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LOW-PASS FILTER
CVBS
R
SOC/DAC/Encoder
S-Video Y’
R
PU
R
PU
R
PU
S-Video C’
R
Y'/G'
R
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
SD1OUT
SD2OUT
SD3OUT
DisableSD
GND
DisableHD
HD1OUT
HD2OUT
HD3OUT
BypassHD
SD1IN
SD2IN
SD3IN
NC
V
S+
NC
HD1IN
HD2IN
HD3IN
BypassSD
THS7365
Bypass
SDLPF
Bypass
HDLPF
P' /B'
B
R
P' /R'
R
+2.7Vto
+5V
DisableHD
DisableSD
75 W
330 F
m
(2)
+
75 W
Y'Out
75 W
330 F
m
(2)
+
75 W
P’ Out
B
75 W
330 F
m
(2)
+
75 W
Y'Out
75 W
330 F
m
(2)
+
75 W
P' Out
B
75 W
330 F
m
(2)
+
75 W
P' Out
R
75 W
330 F
m
(2)
+
ToGPIOor
GND/V
S+
ToGPIOor
GND/V
S+
+V
0.1 F
m
(1)
0.1 F
m
(1)
0.1 F
m
(1)
0.1 F
m
(1)
0.1 F
m
(1)
0.1 F
m
(1)
+2.7Vto+5V
SBOS467 – MARCH 2009.................................................................................................................................................................................................. www.ti.com
Figure 121 shows a typical configuration where the
Group delay is defined as the change in phase
input is ac-coupled and the output is also ac-coupled.
(radians/second) divided by a change in frequency.
AC-coupled inputs are generally required when
An increase in group delay corresponds to a time
current-sink DACs are used or the input is connected
domain pulse response that has overshoot and some
to an unknown source, such as when the THS7365 is
possible ringing associated with the overshoot.
used as an input device.
The use of other type of filters, such as elliptic or
chebyshev,
are
not
recommended
for
video
applications because of the very large group delay
variations near the corner frequency resulting in
Each
channel
of
the
THS7365
incorporates
a
significant overshoot and ringing. While these filters
sixth-order,
low-pass
filter.
These
video
may help meet the video standard specifications with
reconstruction filters minimize DAC images from
respect to amplitude attenuation, the group delay is
being passed onto the video receiver. Depending on
well beyond the standard specifications. Considering
the receiver design, failure to eliminate these DAC
this delay with the fact that video can go from a white
images can cause picture quality problems because
pixel to a black pixel over and over again, it is easy to
of aliasing of the ADC in the receiver. Another benefit
see that ringing can occur. Ringing typically causes a
of the filter is to smooth out aberrations in the signal
display to have ghosting or fuzziness appear on the
that some DACs can have if the internal filtering is
edges of a sharp transition. On the other hand, a
not very good. This benefit helps with picture quality
Bessel filter has ideal group delay response, but the
and ensures that the signal meets video bandwidth
rate of attenuation is typically too low for acceptable
requirements.
image rejection. Thus, the Butterworth filter is a
Each
filter
has
an
associated
Butterworth
respectable compromise for both attenuation and
characteristic.
The
benefit
of
the
Butterworth
group delay.
response is that the frequency response is flat with a
relatively steep initial attenuation at the corner
frequency. The problem with this characteristic is that
the group delay rises near the corner frequency.
(1) AC-coupled input is shown in this example. DC-coupling is also allowed as long as the DAC output voltage is within the allowable linear
input and output voltage range of the THS7365. To apply dc-coupling, remove the 0.1-
F input capacitors and the R
PU pull-up resistors along
with connecting the DAC termination resistors (R) to ground.
(2) This example shows an ac-coupled output. DC-coupling is also allowed by simply removing these capacitors.
Figure 121. Typical AC Input System Driving AC-Coupled Video Lines
40
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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