MAX4680 Maxim, MAX4680 Datasheet - Page 8

• Manufacturer Part Number: MAX4680
• Description: The MAX4680/MAX4690/MAX4700 dual analog switches feature low on-resistance of 1
• Manufacturer: Maxim

1.25 Ω , Dual SPST,
CMOS Analog Switches
___________Applications Information
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, or COM. If power-supply sequencing
is not possible, add two small signal diodes (D1, D2) in
series with the supply pins and a Schottky diode
between V+ and V
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.
Figure 2. Switching-Time Test Circuit
8
SWITCH
LOGIC
INPUT
INPUT
_______________________________________________________________________________________
V
COM_
REPEAT TEST FOR EACH SWITCH. FOR LOAD
CONDITIONS, SEE Electrical Characteristics.
C
V
O
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
= V
COM_
IN_
+5V
GND
COM
V
0
L
L
for overvoltage protection (Figure
(
R
L
R
+ R
L
Overvoltage Protection
ON
)
OR NC_
+15V
-15V
V+
V-
NO_
MAX4680
MAX4690
MAX4700
R
100
L
SWITCH
OUTPUT
C
35pF
L
V
O
Figure 1. Overvoltage Protection Using External Blocking Diodes
OUTPUT
SWITCH
LOGIC
INPUT
COM_
+3V
V
O
0
0
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
t
ON
50%
*
*
V-
V+
0.9V
-15V
+15V
0
D1
D2
* INTERNAL PROTECTION DIODES
*
*
t
OFF
V
t r < 20ns
t f < 20ns
L
0.9V
0
NO_
MAX4680
MAX4690
MAX4700