MAX4562CEE+T Maxim Integrated Products, MAX4562CEE+T Datasheet - Page 12

• Manufacturer Part Number: MAX4562CEE+T
• Description: IC AUD/VID SWITCH IC2 SER 16QSOP
• Manufacturer: Maxim Integrated Products
• Series: 4000r

Specifications of MAX4562CEE+T

• Function: Audio/Video Switch
• Circuit: 2 x SPDT - NO, 2 x SPST - NO
• On-state Resistance: 60 Ohm
• Voltage Supply Source: Single Supply
• Voltage - Supply, Single/dual (±): 2.7 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Serially Controlled, Clickless
Audio/Video Switches
Table 3. MAX4562 2-Wire Serial-Interface Data Format
STP = Stop Condition
Logic “0” in any data bit location places the associated switch open or in hard switching mode.
Logic “1” in any data bit location places the associated switch closed or in soft (clickless) switching mode.
See Table 1 for command-bit configuration.
Table 4. MAX4563 3-Wire Serial-Interface
Data Format
Figures 5 and 6 and the I/O Interface Characteristics
show the timing details of the 3-wire interface. If the two
command bits initiate a SWITCHSET command, a logic
“1” in a switch control location closes the associated
switch, while a logic “0” opens it. If the command bits ini-
tiate a MODESET command, a logic “1” in a switch con-
trol location sets the associated switch into soft
“clickless” mode, while a logic “0” sets it into hard mode.
For command-bit configurations, see Table 1.
There are two ways to connect multiple devices to the
same 3-wire serial interface. The first involves using the
DOUT pin. DOUT presents a copy of the last bit of the
internal shift register, useful for daisy-chaining multiple
devices. Data at DOUT are simply the input data
delayed by eight clock cycles, appearing synchronous
with SCLK’s falling edge. After CS goes high, DOUT
holds the last bit in the shift register until new data are
shifted into DIN. For a simple interface using several
MAX4563 devices, daisy-chain the shift registers by
connecting DOUT of the first device to DIN of the sec-
ond, etc. Connect the CS pins of all devices together.
12
MSB
SRT
COMMAND
D7
C1
______________________________________________________________________________________
1
D6
C0
MSB
0
SW1A SW1B
D5
ADDRESS BYTE
0
1
D4
SWITCH CONTROL
Using Multiple Devices
1
SW2A
D3
A1
SW3B
A0
D2
LSB
0
SW3
D1
ACK
LSB
SW4
D0
C1
MSB
C0
Data are shifted through the MAX4563 in series. When
CS is brought high, all devices are updated simultane-
ously. If any of the devices in the chain are to be left
unchanged, use a NO_OP command for that device, as
shown in Table 1.
An alternate way of connecting multiple devices is to
decode the CS line. In this case, do not use the DOUT
pin and connect the DIN pins of all devices together.
Address decode logic individually controls the CS line
of each device. When a device is to be selected, its CS
line is brought low, data are shifted in, and its CS line is
then brought high to execute the command.
For command bit configuration see Table 1.
Configure the MAX4562/MAX4563 as a T-switch to
improve off-isolation. As the signal frequency is in-
creased, parasitic capacitance significantly degrades
the off-isolation. Figure 7 shows a typical T-switch con-
figuration using the MAX4562/MAX4563 to improve off-
isolation. COM2 and COM3 are tied together to create
a single common node. NO2A and NO2B act as the
input and output of the T-switch, while NO3 is tied to
ground. When both SW2A and SW2B are closed, SW3
should be open to allow the signal to pass into NO2A
and out of NO2B. However, when SW2A and SW2B are
open, energy that is coupled through the open switch-
es is shunted to ground through SW3, which should
now be closed. This increases the off-isolation to typi-
cally -68dB at 10MHz (Figure 8).
SW2A SW1B
COMMAND BYTE
SW2A
SW2B
SW3
LSB
SW4
T-Switches
ACK
STP