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參數(shù)資料
| 型號： | MAX4588CAI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | 16/32-Bit RISC Flash Microcontroller 144-LQFP |
| 中文描述： | DUAL 4-CHANNEL, VIDEO MULTIPLEXER, PDSO28 |
| 封裝： | 5.30 X 0.65 MM, SSOP-28 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 306K |
| 代理商： | MAX4588CAI |
The power-down sequence is the opposite of the
power-up sequence. That is, the V
L
and logic inputs
must go to zero potential before (or simultaneously
with) the V- then V+ supplies. The Absolute Maximum
Ratings must always be observed in order to ensure
proper operation.
Grounding
DC Ground Considerations
Satisfactory high-frequency operation requires that
careful consideration be given to grounding.
For most
applications, a ground plane is strongly recom-
mended, and all GND pins must connect to it with
solid copper.
While the V+ and V- power-supply pins
are common to all switches in a given package, each
input is separated with ground pins that are not inter-
nally connected to each other. This contributes to the
overall high-frequency performance by reducing chan-
nel-to-channel crosstalk. All the GND pins have ESD
diodes to V+ and V-.
In systems that have separate digital and analog (sig-
nal) grounds, connect all GND pins to analog signal
ground. Preserving a good signal ground is much more
important than preserving a digital ground. Ground cur-
rent is only a few nanoamperes.
The digital inputs have voltage thresholds determined by
V
L
and GND (V- does not influence the logic-level thresh-
old). With +5V applied to V
L
, the threshold is about 1.6V,
ensuring compatibility with TTL- and CMOS-logic drivers.
AC Ground and Bypassing
A ground plane is mandatory for satisfactory high-
frequency operation.
Prototyping using hand wiring or
wire-wrap boards is not recommended. Connect all
GND pins to the ground plane with solid copper. (The
GND pins extend the high-frequency ground through
the package wire-frame, into the silicon itself, thus
improving isolation.) Make the ground plane solid metal
underneath the device, without interruptions. There
should be no traces under the device itself. For DIP
packages, this applies to both sides of a two-sided
board. Failure to observe this has a minimal effect on
the “on” characteristics of the switch at high frequen-
cies, but will degrade the off-isolation and crosstalk.
When using the MAX4588’s SO package on PC boards
with a buried ground plane, connect each GND pin to the
ground plane with a separate via. Do not share this via
with any other ground path. Providing a ground via on
both sides of the SMT land further enhances the off-isola-
tion by lowering the parasitic inductance. The DIP pack-
age can have the through-holes directly tied to the buried
plane, or thermally relieved as required to meet manufac-
turability requirements. Again, do not use the through-
hole pads as the current path for any other components.
Bypass all V+ and V- pins to the ground plane with sur-
face-mount 0.01μF capacitors. Locate these capacitors
as close as possible to the pins on the same side of the
board as the device. Do not use feedthroughs or vias
for bypass capacitors. If board layout dictates that the
bypass capacitors are mounted on the opposite side of
the PC board, use short feedthroughs or vias, directly
under the V+ and V- pins. Use multiple vias if possible.
If V- is 0, connect it directly to the ground plane with
solid copper. Keep all traces short.
S ignal Routing
Keep all signal leads as short as possible. Separate all
signal leads from each other, and keep them away from
any other traces that could induce interference.
Separating the signal traces with generously sized
ground wires also helps minimize interference. Routing
signals via coaxial cable, terminated as close to the
MAX4588 as possible, provides the highest isolation.
Board Layout
IC sockets degrade high-frequency performance and
should not be used if signal bandwidth exceeds 5MHz.
Surface-mount parts, having shorter internal lead
frames, provide the best high-frequency performance.
Keep all bypass capacitors close to the device, and
separate all signal leads with ground planes. Such
grounds tend to be wedge-shaped as they get closer to
the device. Use vias to connect the ground planes on
each side of the board, and place the vias in the apex of
the wedge-shaped grounds that separate signal leads.
Logic-level signal lead placement is not critical.
Impedance Matching
The MAX4588 is intended for use in 75
systems,
where the inputs are terminated external to the IC and
the COM terminals see an impedance of 600
or high-
er. The MAX4588 can operate in 50
and 75
systems
with terminations through the IC. However, variations in
R
ON
and R
ON
flatness cause nonlinearities.
Crosstalk and Off-Isolation
The graphs shown in Typical Operating Characteristics
for crosstalk and off-isolation are taken on adjacent
channels. The adjacent channel is the worst-case con-
dition. For example, NO1 has the worst off-isolation to
COM1 due to their proximity. Furthermore, NO1 has the
most crosstalk to NO2, and the least crosstalk to NO4.
Choosing channels wisely necessitates separating the
most sensitive channels from the most offensive.
Conversely, the above information also applies to the
NO5–NO8 inputs to the COM2 pin.
M
Low-Voltage, High-Isolation,
Dual 4-Channel RF/Video Multiplexer
______________________________________________________________________________________
15
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4588CAI+ | 功能描述:視頻開關 IC Dual 4Ch RF Video MUX RoHS:否 制造商:Texas Instruments 開關數(shù)量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| MAX4588CAI+T | 功能描述:視頻開關 IC Dual 4Ch RF Video MUX RoHS:否 制造商:Texas Instruments 開關數(shù)量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| MAX4588CAI-T | 功能描述:視頻開關 IC RoHS:否 制造商:Texas Instruments 開關數(shù)量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| MAX4588CPI | 功能描述:視頻開關 IC RoHS:否 制造商:Texas Instruments 開關數(shù)量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| MAX4588CWI | 功能描述:視頻開關 IC RoHS:否 制造商:Texas Instruments 開關數(shù)量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
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