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参数资料
| 型号： | MAX4545CWP |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 运动控制电子 |
| 英文描述： | Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches |
| 中文描述： | QUAD 1-CHANNEL, AUDIO/VIDEO SWITCH, PDSO20 |
| 封装： | 0.300 INCH, MS-013, SOIC-20 |
| 文件页数： | 11/16页 |
| 文件大小： | 166K |
| 代理商： | MAX4545CWP |
M
Quad/Dual, Low-Voltage,
Bidirec tional RF/Video S witc hes
______________________________________________________________________________________
11
On the MAX4545, GND5 and GND6 should always be
connected to the ground plane with solid copper to
improve isolation and crosstalk.
S ignal Routing
Keep all signal leads as short as possible. Separate all
signal leads from each other and other traces with the
ground plane on both sides of the board. Where possi-
ble, use coaxial cable instead of printed circuit board
traces.
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.
Impedanc e Matc hing
The typical on-resistances of the switches in the
MAX4545/MAX4546/MAX4547 are 14
, but the off-
state impedances are approximately equal to a 6pF
capacitor. In coaxial systems, therefore, it is impossible
to match any impedance for both the on and off state. If
impedance matching is critical, the MAX4546 is best
suited, since its two sections can be configured as a
single on/off switch, as shown in Figure 2. This circuit
“wastes” switches and has higher losses, but has bet-
ter off isolation and maintains good impedance match-
ing in both the on and off states. The resistance values
shown in Figure 3 are optimized with ±5V supplies for
both 50
and 75
systems at room temperature.
Multiplexer
With its excellent off isolation, the MAX4545 is ideal for
use in high-frequency video multiplexers. Figure 3
shows such an application for switching any one of four
video inputs to a single output. The same circuit may
be used as a demultiplexer by simply reversing the sig-
nal direction.
Stray capacitance of traces and the output capacitance
of switches placed in parallel reduces bandwidth, so the
outputs of no more than four individual switches should
be placed in parallel if high bandwidth is to be main-
tained. If more than four mux channels are needed, the
4-channel circuit should be duplicated and cascaded.
COM1
GND1
NC4
NO1
GND4
COM4
NC3
NO2
COM2
GND2
IN2
GND3
COM3
IN1
1
3
4
6
7
8
14
15
16
12
13
11
10
9
5
V-
V-
10nF
38
(61
)
38
(61
)
50
OUT/IN
82
(194
)
50
IN/OUT
LOGIC
IN
2
V+
V+
10nF
SWITCHES SHOWN FOR LOGIC “0” INPUT
( ) ARE FOR 75 SYSTEMS.
SWITCH
LOGIC
0
1
OFF
ON
MAX4546
Figure 2. Impedance Matching On/Off Switch
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PDF描述 |
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| MAX4547CEE | Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4545CWP+ | 功能描述:视频开关 IC Bidirectional RF Video Switch RoHS:否 制造商:Texas Instruments 开关数量:4 开启电阻（最大值）:12 Ohms 传播延迟时间: 开启时间（最大值）: 关闭时间（最大值）: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:WQFN-42 封装:Reel |
| MAX4545CWP+T | 功能描述:视频开关 IC Bidirectional RF Video Switch RoHS:否 制造商:Texas Instruments 开关数量:4 开启电阻（最大值）:12 Ohms 传播延迟时间: 开启时间（最大值）: 关闭时间（最大值）: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:WQFN-42 封装:Reel |
| MAX4545CWP-T | 功能描述:RF 开关 IC RoHS:否 制造商:M/A-COM Technology Solutions 开关数量:Single 开关配置:SPDT 介入损耗:0.6 dB 截止隔离（典型值）:43 dB 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:PQFN-16 封装:Reel |
| MAX4545EAP | 功能描述:RF 开关 IC RoHS:否 制造商:M/A-COM Technology Solutions 开关数量:Single 开关配置:SPDT 介入损耗:0.6 dB 截止隔离（典型值）:43 dB 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:PQFN-16 封装:Reel |
| MAX4545EAP/GG8 | 功能描述:RF 开关 IC RoHS:否 制造商:M/A-COM Technology Solutions 开关数量:Single 开关配置:SPDT 介入损耗:0.6 dB 截止隔离（典型值）:43 dB 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:PQFN-16 封装:Reel |
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