MAX4699 Maxim, MAX4699 Datasheet - Page 8

• Manufacturer Part Number: MAX4699
• Description: The MAX4699/MAX4701/MAX4702 are low-voltage, single-supply CMOS analog switches
• Manufacturer: Maxim

Caution: Do not exceed the absolute maximum rat-
ings because stresses beyond the listed ratings
may cause permanent damage to the devices.
Proper power-supply sequencing is recommended for
all CMOS devices. Always apply V+ before applying
analog signals, especially if the analog signal is not cur-
rent limited. If this sequencing is not possible, and if the
analog inputs are not current limited to <20mA, add a
small-signal diode (D1) as shown in Figure 1. If the ana-
log signal can dip below GND, add D2. Adding protec-
tion diodes reduces the analog range to a diode drop
(about 0.7V) below V+ (for D1), and a diode drop above
ground (for D2). On-resistance increases slightly at low
supply voltages. Maximum supply voltage (V+) must not
exceed +6V.
Low-Voltage, Dual DPDT/Quad SPDT
Analog Switches in QFN
Figure 2. Switching Time
Figure 3. Break-Before-Make Interval
8
_______________________________________________________________________________________
MAX4699
MAX4701
MAX4702
MAX4699
MAX4701
MAX4702
LOGIC
INPUT
LOGIC
INPUT
V
N_
V
N_
Power-Supply Sequencing and
C
V
C
OUT
L
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
NC_
NO_
IN_
NO_
OR NC_
IN_
INCLUDES FIXTURE AND STRAY CAPACITANCE.
= V
GND
N_
(
R
Overvoltage Protection
L
GND
R
+ R
L
ON
)
V+
V+
V+
V+
COM_
COM_
R
300Ω
R
300Ω
L
L
V
OUT
C
35pF
C
35pF
L
L
V
OUT
Adding protection diode D2 causes the logic threshold
to be shifted relative to GND. TTL compatibility is not
guaranteed when D2 is added.
Protection diodes D1 and D2 also protect against some
overvoltage situations. With Figure 1’s circuit, if the sup-
ply voltage is below the absolute maximum rating, and
if a fault voltage up to the absolute maximum rating is
applied to an analog signal pin, no damage will result.
The MAX4702 features a V
lower logic input thresholds down to 1.0V min for V
the quad SPDT configuration. Power-up V
been powered with a minimum of 1.5V to ensure proper
operation of the device.
OUTPUT
SWITCH
LOGIC
INPUT
LOGIC
INPUT
V
OUT
Test Circuits/Timing Diagrams
V
V
IH
IL
0
V
V
IH
IL
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
V
t
50%
OUT
ON
50%
V
0.9 x V
L
t
D
Logic Input (MAX4702)
0UT
L
logic input that allows for
t
OFF
0.9 x V
t r < 5ns
t f < 5ns
0.9 x V
OUT
OUT
L
after V+ has
IH
in