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參數(shù)資料
| 型號： | MAX4567ESE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SW DUAL VIDEO BIDIRECT 16SOIC |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 功能： | 視頻開關 |
| 電路： | 2 x SPDT |
| 導通狀態(tài)電阻： | 60 歐姆 |
| 電壓電源： | 單/雙電源 |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 12 V，± 2.7 V ~ 6 V |
| 電流 - 電源： | 1µA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-SOIC |
| 包裝： | 帶卷 (TR) |
_______________Theory of Operation
The MAX4565/MAX4566/MAX4567 are high-frequency
“T” switches. Each “T” switch consists of two series
CMOS switches, with a third N-channel switch at the
junction that shunts capacitively-coupled signals to
ground when the series switches are off. This produces
superior high-frequency signal isolation when the
switch is turned off.
Logic-Level Translators
The MAX4565/MAX4566/MAX4567 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
MAX4565/MAX4566/MAX4567
Quad/Dual, Low-Voltage,
Bidirectional RF/Video Switches
8
_______________________________________________________________________________________
______________________________________________________________Pin Description
NAME
FUNCTION*
MAX4565
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.
MAX4566
1, 16
3, 7, 10, 14
12
2, 8, 9, 15
6, 11
4, 13
5
MAX4567
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
A2
(NC)
S
P1
N3
D
N1
V-
GND_
IN_
V+
V-
COM_
NO_
S
D
N2
S
P2
D
NORMALLY OPEN SWITCH CONSTRUCTION
COM_ - NO_
IN_
0
1
OFF
ON
ESD DIODES
ON GND_, IN_,
COM_, NO_, AND NC_
Figure 1. T-Switch Construction
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