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| 型号： | MAX4545CWP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC VIDEO SWITCH QUAD SPST 20SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 功能： | 视频开关 |
| 电路： | 4 x SPST - NO |
| 导通状态电阻： | 20 欧姆 |
| 电压电源： | 单/双电源 |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 12 V，± 2.7 V ~ 6 V |
| 电流 - 电源： | 1µA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC W |
| 包装： | 带卷 (TR) |
_______________Theory of Operation
Logic-Level Translators
The MAX4545/MAX4546/MAX4547 are constructed as
high-frequency “T” switches, as shown in Figure 1. The
logic-level input, IN_, is translated by amplifier A1 into a
V+ to V- logic signal that drives amplifier A2. (Amplifier
A2 is an inverter for normally closed switches.)
Amplifier A2 drives the gates of N-channel MOSFETs
N1 and N2 from V+ to V-, turning them fully on or off.
The same signal drives inverter A3 (which drives the
P-channel MOSFETs P1 and P2) from V+ to V-, turning
them fully on or off, and drives the N-channel MOSFET
N3 off and on.
The logic-level threshold is determined by V+ and
GND_. The voltage on GND_ is usually at ground
potential, but it may be set to any voltage between
(V+ - 2V) and V-. When the voltage between V+ and
GND_ is less than 2V, the level translators become very
slow and unreliable. Since individual switches in each
package have individual GND_ pins, they may be set to
different voltages. Normally, however, they should all
be connected to the ground plane.
Switch On Condition
When the switch is on, MOSFETs N1, N2, P1, and P2
are on and MOSFET N3 is off. The signal path is COM_
to NO_, and because both N-channel and P-channel
MOSFETs act as pure resistances, it is symmetrical
(i.e., signals may pass in either direction). The off
MOSFET, N3, has no DC conduction, but has a small
amount of capacitance to GND_. The four on
MOSFETs also have capacitance to ground that,
together with the series resistance, forms a lowpass fil-
ter. All of these capacitances are distributed evenly
along the series resistance, so they act as a transmis-
sion line rather than a simple R-C filter. This helps to
explain the exceptional 300MHz bandwidth when the
switches are on.
MAX4545/MAX4546/MAX4547
Quad/Dual, Low-Voltage,
Bidirectional RF/Video Switches
8
_______________________________________________________________________________________
______________________________________________________________Pin Description
NAME
FUNCTION*
MAX4545
1, 10, 11,
20
IN_
Digital Control Input
PIN
3, 6, 8, 13,
15, 18
GND_
RF and Logic Ground. Grounds are not internally connected to each other,
and should all be connected to a ground plane (see
Grounding section).
16
V+
Positive Supply-Voltage Input (analog and digital)
2, 9, 12, 19
COM_
Analog Switch Common** Terminals
—
NC_
Analog Switch Normally Closed** Terminals
4, 7, 14, 17
NO_
Analog Switch Normally Open** Terminals
5
V-
Negative Supply-Voltage Input. Connect to ground plane for single-supply
operation.
MAX4546
1, 16
3, 7, 10, 14
12
2, 8, 9, 15
6, 11
4, 13
5
MAX4547
1, 9
4, 6, 12, 14
7, 15
5, 13
8, 10
2, 16
3, 11
*
All pins have ESD diodes to V- and V+.
** NO_ (or NC_) and COM_ pins are identical and interchangeable. Either may be considered as an input or output; signals pass
equally well in either direction.
A1
A2
A3
A1
(NC)
S
P1
N3
D
N1
V-
GND_
IN_
V+
COM_
NO_
S
D
N2
S
P2
D
NORMALLY OPEN SWITCH CONSTRUCTION
COM_ - NO_
IN_
0
1
OFF
ON
BSD DIODES
ON GND_, IN_,
COM_, NO_, AND NC_
Figure 1. T-Switch Construction
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相关代理商/技术参数 |
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| 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 |
| MAX4545EAP+ | 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 |
| MAX4545EAP+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 |
| MAX4545EAP-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 |
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