MAX4563 查看數據表（PDF） - Maxim Integrated

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MAX4563

Serially Controlled, Clickless Audio/Video Switches

Maxim Integrated 

Serially Controlled, Clickless

Audio/Video Switches

Detailed Description

The MAX4562/MAX4563 are serial-interface controlled

switches with soft-mode “clickless” and hard-mode oper-

ating capability. The MAX4562/MAX4563 contain two

SPST switches and two SPDT switches. The SPDT

switches are actually 2-to-1 multiplexers, in that each

SPDT is really two independent SPST switches with a

common node, as shown in the Pin Configuration. Each

switch is controlled independently by either the 2-wire

I2C-compatible or 3-wire SPI/QSPI/MICROWIRE-compat-

ible serial interface.

Audio off-isolation and crosstalk is -85dB at 20kHz.

Video off-isolation and crosstalk is at least -55dB at

10MHz.

Each switch of either device may be set to operate in

either soft or hard mode. In soft mode, the switching

transition is slowed to avoid the audible “clicking” that

can occur when switches are used to route audio sig-

nals. In hard mode, the switches are not slowed down,

making this mode useful when a faster response is

required. If a new command is issued while any soft-

mode switch is transitioning, the switch transition time is

decreased so it reaches its final state before the new

command is executed. Soft mode and open are the

power-up default states for all switches. Switches in the

same mode are guaranteed to be break-before-make

relative to each other. Break-before-make does not apply

between switches operating in different modes.

These devices operate from a +2.7V to +5.5V single

supply. The MAX4562 features a 2-wire I2C-compatible

serial interface, and the MAX4563 features a 3-wire

SPI/QSPI/MICROWIRE-compatible serial interface.

70%

70%

SDA

20%

20%

tSU, DAT

tLOW

tHD, DAT

SCL

tHD, STA

70%

20%

START CONDITION

70%

70%

20%

20%

tHIGH

tR

tF

Figure 3. 2-Wire Serial-Interface Timing Diagram

tSU, STA

70%

20%

tHD, STA

70%

70%

REPEATED START CONDITION

tSU, STO

70%

20%

tBUF

70%

70%

20%

STOP CONDITION START CONDITION

SLAVE ADDRESS BYTE

COMMAND BYTE

SDA

MSB

SCL

LSB ACK MSB

LSB ACK

START CONDITION

STOP CONDITION

Figure 4. A Complete 2-Wire Serial-Interface Transmission

10 ______________________________________________________________________________________

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