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MAX4648EUT Datasheet(PDF) 6 Page - Maxim Integrated Products

Part # MAX4648EUT
Description  25Ω SPST Analog Switches in SOT23-6
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX4648EUT Datasheet(HTML) 6 Page - Maxim Integrated Products

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Applications Information
Overvoltage Protection
Proper power-supply sequencing is recommended for
all CMOS devices. Do not exceed the absolute maxi-
mum ratings because stresses beyond the listed rat-
ings can cause permanent damage to the devices.
Always sequence V+ on first, then V-, followed by the
logic inputs, NO, NC, or COM. If power-supply
sequencing is not possible, add two small signal
diodes (D1, D2) in series with supply pins (Figure 1).
Adding diodes reduces the analog signal range to one
diode drop below V+ and one diode drop above V-, but
does not affect the devices’ low switch resistance and
low leakage characteristics. Device operation is
unchanged, and the difference between V+ and V-
should not exceed 44V. These protection diodes are
not recommended when using a single supply.
Off-Isolation at High Frequencies
In 50Ω systems, the high-frequency on-response of
these parts extends from DC to above 300MHz, with a
typical loss of -2dB. When the switch is turned off, how-
ever, it behaves like a capacitor, and off-isolation
decreases with increasing frequency. This effect is
more pronounced with higher source and load imped-
ances. Above 5MHz, circuit board layout becomes criti-
cal. The graphs shown in the Typical Operating
Characteristics were taken using a 50Ω source and
load connected with BNC connectors.
25Ω SPST Analog Switches in SOT23-6
6
_______________________________________________________________________________________
tr < 20ns
tf < 20ns
50%
0
LOGIC
INPUT
V-
V-
RL
300Ω
NO
OR NC
GND
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
VO = VCOM
(
RL
)
RL + RON
SWITCH
INPUT
IN
+3V
tOFF
0
COM
SWITCH
OUTPUT
0.9V0
0.9V0
tON
VO
SWITCH
OUTPUT
LOGIC
INPUT
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
V+
CL
35pF
V+
VO
VCOM
0
REPEAT TEST FOR EACH SWITCH. FOR LOAD
CONDITIONS, SEE Electrical Characteristics.
MAX4647
MAX4648
Figure 2. Switching-Time Test Circuit
V+
COM
D2
D1
V-
NO
Vg
V+
V-
MAX4647
MAX4648
Figure 1. Overvoltage Protection Using External Blocking
Diodes


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