MAX4851 Maxim, MAX4851 Datasheet - Page 12

• Manufacturer Part Number: MAX4851
• Description: The MAX4851/MAX4851H/MAX4853/MAX4853H family of quad single-pole/single-throw (SPST) switches operates from a single +2V to +5
• Manufacturer: Maxim

The logic inputs (IN_) accept up to +5.5V even if the
supply voltages are below this level. For example, with a
+3.3V V
high to +5.5V, allowing for mixing of logic levels in a sys-
tem. Driving IN_ rail-to-rail minimizes power consump-
tion. For a +2V supply voltage, the logic thresholds are
0.5V (low) and 1.4V (high). For a +5V supply voltage, the
logic thresholds are 0.8V (low) and 1.8V (high).
The on-resistance of these switches changes very little
for analog input signals across the entire supply volt-
age range (see Typical Operating Characteristics). The
switches are bidirectional; therefore, NO_ and COM_
can be either inputs or outputs.
The positive terminal of the comparator is internally set
to V
(CIN) is below the threshold (V
output (COUT) goes high. When CIN rises above
V
The comparator threshold allows for detection of head-
phones since headphone audio signals are typically
biased to V
3.5 Ω Ω /7 Ω Ω Quad SPST Switches with Over-Rail
Signal Handling
Figure 6. Comparator Switching Time
12
CC
MAX4851
MAX4851H
MAX4853
MAX4853H
CC
/ 3, COUT goes low.
______________________________________________________________________________________
PART
CC
/ 3. When the negative comparator terminal
CC
supply, IN_ can be driven low to GND and
MAX4851_
/ 2.
Applications Information
NO1/NO3
V
CIN_
NO_
3.5
3.5
3.5
3.5
V
CIN_
TH
V
R
= V
CC
3
ON
Digital Control Inputs
Analog Signal Levels
CC
/3
(Ω)
CC
NO2/NO4
GND
V
V
CC
CC
/ 3), the comparator
3.5
3.5
COUT_
7
7
Comparator
V
COUT_
OUTPUT (V
COMPARATORS
COMPARATOR
COMPARATOR
INPUT (V
COUT_
—
—
CIN_
1
1
)
)
Caution: Do not exceed the absolute maximum rat-
ings because stresses beyond the listed ratings
may cause permanent damage to the device.
Proper power-supply sequencing is recommended for
all CMOS devices. Always apply V
analog signals, especially if the analog signal is not
current limited.
Figure 5. Channel Off-/On-Capacitance
V
V
TH
TH
+ 100mV
- 100mV
CAPACITANCE
V
f = 1MHz
METER
OUT
0V
t
COMP
Input signal passes through the switch.
High-impedance switch input.
Input signal passes through the switch.
High-impedance switch input.
50%
Power-Supply Sequencing
10nF
50%
OVER-RAIL HANDLING
COM_
NO_
GND
V
V
CC
CC
50%
t
t
Selector Guide
R
F
< 20ns
< 20ns
MAX4851_
MAX4853_
50%
CC
t
COMP
before applying
IN
V
IL
OR V
IH