參數(shù)資料
型號(hào)： MAX7428-MAX7432
廠商： Maxim Integrated Products, Inc.
英文描述： Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 20-LCCC -55 to 125
中文描述： 標(biāo)準(zhǔn)清晰度視頻重建濾波器和緩沖器
文件頁(yè)數(shù)： 9/21頁(yè)
文件大小： 444K
代理商： MAX7428-MAX7432
M
Standard Definition Video Reconstruction
Filters and Buffers
_______________________________________________________________________________________
9
Filter
Filter Response
The reconstruction filter consists of a 6th-order
Butterworth filter in three second-order stages. The
Butterworth filter features a maximally flat passband for
NTSC and PAL bandwidths. The stopband offers typical-
ly 50dB of attenuation at sampling frequencies of 25MHz
and above (see
Typical Operating Characteristics
).
The corner frequency is not critical since the response
of the filter meets both the stopband and passband
specifications. The MAX7428/MAX7430/MAX7432
incorporate an autotrimming feature that reduces the
corner frequency variation digitally. It is possible,
although not likely, that a discrete shift in the corner fre-
quency may occur due to an external environmental
change. The autotrimming operates continuously so
that the corner frequency remains centered over the full
operating temperature range.
High-Frequency Boost
The high-frequency boost compensates for signal degra-
dation and roll-off in the signal path prior to the MAX7428/
MAX7430/MAX7432. High-frequency boost is program-
mable in four steps to increase image sharpness.
Output Buffer
The output buffer is able to drive two 150
video loads
with a 2Vp-p signal. The +6dB gain of the output buffer
is independent of the filter bypass or input selection.
The output buffer drives the 75
backmatch resistors
and series capacitor (typically 220μF). The MAX7428/
MAX7430/MAX7432 are able to drive the video load
directly without using the 220μF capacitor. This feature
is common in SCART applications. The OUTDISABLE bit
of the control register disables the output (mute) (see
Control Register
section).
Filter Bypass
The MAX7428/MAX7430/MAX7432 offer selectable filter
bypassing that allows either of the video inputs to be fil-
tered or unfiltered. The 1M
optional input resistors are
needed only in filter bypass mode to provide a dis-
charge path for the input coupling capacitors.
Serial Interface
Maxim
’
s Single Pin Bus (MSPB) interface uses DATA to
transfer data to and from the microprocessor (μP) and
the MAX7428/MAX7430/MAX7432. This negative logic
protocol uses three different pulse widths to represent
a logic
“
1
”
, logic
“
0
”
, and control commands. MSPB
allows up to 16 devices to be connected on the same
bus by assigning a unique 4-bit identification address
to each device. The μP can communicate to each
device individually or by sending a
“
broadcast
”
mes-
sage to all the devices. The unique address for each
device is set by means of the time constant set by the
external capacitor connected in parallel with the exter-
nal 300k
resistor (see
Initializing the MAX7428/
MAX7430/MAX7432
section).
MAX7428 Control Register
Table 1 defines the structure of the MAX7428 8-bit con-
trol register programmed by MSPB. This register con-
trols the selection of INA or INB, SYNCIO functionality,
filter bypassing, clamp-level selection, high-frequency
boost control, and output disable. See
Maxim
’
s Single
Pin Bus Interface (MSPB)
section for detailed program-
ming instructions.
SYNCIO:
SYNCIO Select bit. A logic 0 sets the SYNCIO
pin to function as an output while a logic 1 sets SYNCIO
to function as an input.
ABSEL:
Channel Select bit. A logic 0 selects the input
at INB to be processed while a logic 1 selects the input
at INA to be processed.
BYPASS:
Filter Bypass Select bit. A logic 1 selects the
filter while a logic 0 bypasses the filter.
Table 1. MAX7428 Control Register
(MSB)
FIRST BIT
(LSB)
—
0
NAME
DEFAULT
SYNCIO
0
ABSEL
1
BYPASS
1
CLEVEL
0
BOOST1
0
BOOST0
0
OUTDISABLE
0
BOOST1
BOOST0
RELATIVE
HIGH-FREQUENCY
BOOST
0
0
1
1
0
1
0
1
0
0.45dB
0.90dB
1.35dB
Table 2. Boost Level Programming
相關(guān)PDF資料
PDF描述
MAX7430 Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CDIP -55 to 125
MAX7432 Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 20-LCCC -55 to 125
MAX7432EUD Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CDIP -55 to 125
MAX7428EKA-T Standard Definition Video Reconstruction Filters and Buffers
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MAX742C/D DIE 制造商:Maxim Integrated Products 功能描述:
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MAX742CWP 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Switch-Mode Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
MAX742CWP+ 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Switch-Mode Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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