OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MAX4745ELB+T

P1-P3P4-P6P7-P9P10-P12
Detailed Description
The MAX4744/MAX4744H/MAX4745/MAX4745H/
MAX4746H are low on-resistance, low-voltage, dual-
SPDT analog switches that operate from a +1.8V to
+5.5V single supply. These devices feature a negative
signal capability that allows signals as low as V
CC
-
5.5V to pass through without distortion.
The MAX4744/MAX4745 feature two digital control bits
to control each switch independently (see Table 1). The
MAX4744H/MAX4745H/MAX4746H have one control bit
to switch both switches and an enable input EN to put
the switches in a high-impedance mode. Driving EN
low takes the switches out of high impedance and CB0
controls both switches (see Table 2).
The MAX4744/MAX4744H have internal shunt resistors
on all NO and NC terminals, and the MAX4746H has
internal shunt resistors on NC terminals to suppress
click-and-pop sounds that can occur when switching
audio signals between precharged points.
Applications Information
Digital Control Inputs
The MAX4744/MAX4744H/MAX4745/MAX4745H/
MAX4746H logic inputs accept up to +5.5V, regardless
of supply voltage. For example, with a +3.3V supply,
CB0, CB1, CB2, and EN can be driven low to GND and
high to +5.5V, allowing for mixed logic levels in a sys-
tem. Driving CB0, CB1, CB2, and EN rail-to-rail mini-
mizes power consumption.
MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H
Low-Voltage, Dual SPDT, Audio Clickless
Switches with Negative Rail Capability
_______________________________________________________________________________________ 7
Pin Description
PIN
MAX4744/
MAX4745
MAX4744H/
MAX4745H/
MAX4746H
NAME FUNCTION
1 — CB1 Digital Control Input for Analog Switch 1
—1EN
Enable Input. Driving EN high causes all switches to be high impedance. Pull EN low for
normal operation.
2 2 NO1 Analog Switch 1—Normally Open Terminal
3 3 GND Ground
4 4 NO2 Analog Switch 2—Normally Open Terminal
5 — CB2 Digital Control Input for Analog Switch 2
— 5 CB0 Digital Control Input for Analog Switches 1 and 2
6 6 COM2 Analog Switch 2—Common Terminal
7 7 NC2 Analog Switch 2—Normally Closed Terminal
88V
CC
Positive Supply Voltage from +1.8V to +5.5V
9 9 NC1 Analog Switch 1—Normally Closed Terminal
10 10 COM1 Analog Switch 1—Common Terminal
CONTROL SWITCH STATE
CB1 CB2 Switch 1 Switch 2
0 0 Connected to NC1 Connected to NC2
0 1 Connected to NC1 Connected to NO2
1 0 Connected to NO1 Connected to NC2
1 1 Connected to NO1 Connected to NO2
Table 1. MAX4744/MAX4745 Truth Table
CONTROL SWITCH STATE
EN CB0 Switch 1 Switch 2
0 0 Connected to NC1 Connected to NC2
0 1 Connected to NO1 Connected to NO2
1 X High Impedance High Impedance
Table 2. MAX4744H/MAX4745H/MAX4746H
Truth Table
X = Don’t Care
MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H
Low-Voltage, Dual SPDT, Audio Clickless
Switches with Negative Rail Capability
8 _______________________________________________________________________________________
CB1
CB2
GND
NC1
V
CC
COM1
COM2
NO1
NO2
NC2
EN
CB0
GND
NC1
COM1
COM2
NO1
NO2
NC2
SWITCH 1
SWITCH 2
SWITCH 1
SWITCH 2
CB1
CB2
GND
NC1
COM1
COM2
NO1
NO2
NC2
CB0
GND
NC1
COM1
COM2
NO1
NO2
NC2
HIGH-Z
HIGH-Z
HIGH-Z
HIGH-Z
HIGH-Z
HIGH-Z
SHUNT
SWITCH
SHUNT
SWITCH
CONTROL
LOGIC
V
CC
CONTROL
LOGIC
SWITCH 1
SWITCH 2
V
CC
EN
V
CC
MAX4744
MAX4744H
CB0
GND
NO1
COM1
COM2
NC1
NO2
NC2
SHUNT
SWITCH
CONTROL
LOGIC
SWITCH 1
SWITCH 2
V
CC
EN
MAX4746H
MAX4745HMAX4745
SWITCH 1
SWITCH 2
Figure 1. Functional Diagram
Analog Signal Levels
These devices pass signals from V
CC
to as low as
V
CC
- 5.5V, including signals below ground with minimal
distortion and very little change in on-resistance (see the
Typical Operating Characteristics
). The switches are bidi-
rectional, so the NO_, NC_, and COM_ terminals can be
used as either inputs or outputs.
COM_ Protection with V
CC
= 0V
(MAX4744H/MAX4745H/MAX4746H)
This feature prevents any damage to the device due to
improper power-supply sequencing. The protection
applies if a signal is applied on COM_ when V
CC
is less
than 0.5V. The switch is not protected if V
CC
goes
above 0.5V due to parasitic capacitive coupling or any
leakage between COM_ and V
CC
. The signal at COM_
ranges between (V
CC
- 6.0V) to 6.0V under protection
conditions.
Click-and-Pop Suppression
The MAX4744/MAX4744H have a shunt resistor on all
their NO and NC terminals to automatically discharge
any capacitance when they are not connected to COM.
The shunt resistor reduces audible click-and-pop
sounds that occur when switching between audio
sources. Audible clicks and pops are caused when a
step DC voltage is switched into the speaker. The DC
step transients can be reduced by automatically dis-
charging the side that is not connected to the COM ter-
minal, reducing any residual DC voltage and reducing
clicks and pops.
MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H
Low-Voltage, Dual SPDT, Audio Clickless
Switches with Negative Rail Capability
_______________________________________________________________________________________ 9
t
r
< 5ns
t
f
< 5ns
50%
0V
LOGIC
INPUT
R
L
COM_
GND
CB_
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE
V
OUT
= V
N_ (
R
L
)
R
L
+ R
ON
V
NC_
OR V
NO_
V
CC
t
OFF
0V
NO_
OR NC_
0.8 x V
0UT
0.2 x V
OUT
t
ON
V
OUT
SWITCH
OUTPUT
LOGIC
INPUT
IN DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
V
CC
C
L
V
CC
V
OUT
MAX4744/MAX4745/
MAX4744H/MAX4745H/
MAX4746H
Figure 2. Switching Time
50%
V
CC
0V
LOGIC
INPUT
V
OUT
0.9 x V
OUT
t
BBM
LOGIC
INPUT
R
L
GND
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE
NO_
CB_
NC_
V
OUT
V
CC
V
CC
C
L
COM_
MAX4744/MAX4745/
MAX4744H/MAX4745H/
MAX4746H
V
NC_
= V
NO_
Figure 3. Break-Before-Make Interval
Test Circuits/Timing Diagrams
P1-P3P4-P6P7-P9P10-P12

MAX4745ELB+T

Mfr. #:
Buy MAX4745ELB+T
Manufacturer:
Maxim Integrated
Description:
Analog Switch ICs Dual SPDT Audio Clickless Switch
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet