MAX4745 Maxim, MAX4745 Datasheet - Page 9

• Manufacturer Part Number: MAX4745
• Description: The MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H dual SPDT (single-pole/double-throw) audio switches feature negative signal capability that allows signals as low as VCC - 5
• Manufacturer: Maxim

Figure 2. Switching Time
Figure 3. Break-Before-Make Interval
These devices pass signals from V
V
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.
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
than 0.5V. The switch is not protected if V
above 0.5V due to parasitic capacitive coupling or any
CC
MAX4744H/MAX4745H/
MAX4744H/MAX4745H/
MAX4744/MAX4745/
- 5.5V, including signals below ground with minimal
MAX4744/MAX4745/
MAX4746H
MAX4746H
V
NC_
(MAX4744H/MAX4745H/MAX4746H)
LOGIC
INPUT
V
= V
LOGIC
NC_
INPUT
NO_
OR V
COM_ Protection with V
Low-Voltage, Dual SPDT, Audio Clickless
NO_
_______________________________________________________________________________________
C
V
Switches with Negative Rail Capability
C
L
OUT
L
INCLUDES FIXTURE AND STRAY CAPACITANCE
NC_
NO_
CB_
NO_
OR NC_
CB_
INCLUDES FIXTURE AND STRAY CAPACITANCE
= V
GND
N_
(
R
Analog Signal Levels
L
GND
R
+ R
L
ON
V
V
)
CC
CC
V
V
COM_
COM_
CC
CC
CC
to as low as
R
R
CC
CC
L
L
CC
is less
= 0V
goes
V
OUT
C
C
L
L
V
OUT
leakage between COM_ and V
ranges between (V
conditions.
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.
OUTPUT
SWITCH
LOGIC
INPUT
Test Circuits/Timing Diagrams
LOGIC
INPUT
V
OUT
V
CC
0V
0V
V
CC
0V
IN DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
CC
V
Click-and-Pop Suppression
t
50%
OUT
ON
50%
- 6.0V) to 6.0V under protection
0.8 x V
t
BBM
0UT
CC
. The signal at COM_
t
OFF
0.9 x V
t r < 5ns
t f < 5ns
0.2 x V
OUT
OUT
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