MAX4676 Maxim, MAX4676 Datasheet - Page 7

• Manufacturer Part Number: MAX4676
• Description: The MAX4675/MAX4676 single analog switches feature 3Ω (max) on-resistance (RON) and 0
• Manufacturer: Maxim

Proper power-supply sequencing is recommended for all
CMOS devices. Do not exceed the absolute maximum
ratings because stresses beyond the listed ratings can
cause permanent damage to the devices. Always
sequence V+ on first, then V-, followed by the logic
inputs, NO, NC, or COM. If proper power-supply
sequencing is not possible, add two small-signal diodes
(D1, D2) in series with the 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 12V.
Figure 2. Switching Time
Figure 3. Charge Injection
MAX4675
MAX4676
MAX4675
MAX4676
LOGIC
INPUT
V
GEN
SWITCH
INPUT
Applications Information
R
C
V
GEN
_______________________________________________________________________________________
L
OUT
INCLUDES FIXTURE AND STRAY CAPACITANCE.
NO
OR NC
IN
= V
GND
COM
OR NO
NC
GND
Overvoltage Protection
(
R
L
R
+ R
L
ON
)
V+
V+
IN
V-
V-
COM
V
IN
3Ω Single SPST Analog Switches
= 3.0V
V+
V+
V-
V-
COM
R
300Ω
L
SWITCH
OUTPUT
C
C
35pF
L
L
V
OUT
V
OUT
Power-supply bypassing improves noise margin and
prevents switching noise from propagating from the V+
supply to other components. A 0.1µF capacitor connect-
ed from V+ to GND is adequate for most applications.
Figure 1. Overvoltage Protection Using External Blocking
Diodes
OUTPUT
SWITCH
LOGIC
INPUT
V
OUT
IN
IN
Timing Diagrams/Test Circuits
+3V
0
0
V
g
OFF
OFF
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
IN DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
V
t
50%
OUT
ON
Q = (∆V
0.9 x V
ON
ON
OUT
50%
0UT
)(C
V+
V-
t
L
OFF
)
t r < 20ns
t f < 20ns
0.9 x V
∆V
OUT
OUT
OFF
OFF
7