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參數(shù)資料
| 型號： | MAX7428 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CDIP -55 to 125 |
| 中文描述： | 標(biāo)準(zhǔn)清晰度、視頻重建濾波器及緩沖器 |
| 文件頁數(shù)： | 9/21頁 |
| 文件大?。?/td> | 444K |
| 代理商： | MAX7428 |
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
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PDF描述 |
|---|---|
| MAX7428-MAX7432 | Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 20-LCCC -55 to 125 |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7428EKA | 制造商:Maxim Integrated Products 功能描述:8 PINS SOT PKG - Bulk |
| MAX7428EKA+ | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:ACTV FLTR SGL LOW PASS 6TH ORDR 8PIN SOT-23 - Cut Tape Product |
| MAX7428EKA+T | 功能描述:視頻 IC Standard Def Video Reconstruction Filtr RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MAX7428EKA-T | 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| MAX7428EVC16 | 功能描述:有源濾波器 Programmers, Development Systems RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
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