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參數(shù)資料
| 型號： | MAX4529EUT-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Digital Signal Processor 144-BGA MICROSTAR |
| 中文描述： | 1-CHANNEL, AUDIO/VIDEO SWITCH, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 123K |
| 代理商： | MAX4529EUT-T |
M
Low-Voltage, Bidirec tional
RF/Video S witc h
_______________________________________________________________________________________
7
Pin Desc ription
6
FUNCTION*
SOT23-6
NAME
Analog Switch Common** Terminal. Analog signal voltages should never exceed
V+ or V-.
—
7
Not Internally Connected
PIN
1
COM
Analog Switch Normally Closed** Terminal
2
Positive Supply-Voltage Input (analog and digital). The voltage difference between
V+ and V- should never exceed 12V.
5
RF and Logic Ground. Connect to ground plane.
3
-5V Supply Input. Connect to GND for single-supply operation.
DIP/SO/μMAX
1, 6
2
8
3
5
N.C.
NC
V+
GND
V-
*
** NC and COM pins are identical and interchangeable. Either may be considered as an input or output; signals pass equally well in
either direction.
All pins except N.C. have ESD diodes to V- and V+.
T heory of Operation
Logic -Level T ranslators
The MAX4529 is constructed as a high-frequency “T”
switch, as shown in Figure 1. The logic-level input, IN,
is translated by amplifier A1 into a V+ to V- logic signal
that drives inverter A2. 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 poten-
tial, 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. Normally, GND should be connect-
ed to the ground plane.
S witc h 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
NC, 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 filter. All of these capaci-
tances are distributed evenly along the series resis-
tance, so they act as a transmission line rather than a
simple R-C filter. This helps to explain the exceptional
300MHz bandwidth when the switches are on.
Typical attenuation in 50
systems is -2dB and is rea-
sonably flat up to 100MHz. Higher-impedance circuits
show even lower attenuation (and vice versa), but
slightly lower bandwidth due to the increased effect of
the internal and external capacitance and the switch’s
internal resistance.
A1
A2
A3
S
S
P1
N3
D
D
D
N1
V-
GND
IN
V+
V+
V-
COM
NC
S
D
N2
S
S
P2
D
NORMALLY CLOSED SWITCH CONSTRUCTION
COM - NC
IN
0
1
ON
OFF
ESD DIODES
ON GND, IN,
COM, AND NC
Figure 1. T-Switch Construction
4
Logic-Level Control Input. Logic-level voltages should never exceed V+ or V-.
4
IN
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