General Description
The MAX4548/MAX4549 serial-interface, programmable, triple 3x2 audio/video crosspoint switches are ideal for multimedia applications. The devices include three crosspoint switch matrices, each containing three inputs and two outputs. To improve off-isolation, each switch matrix has a shunt input and each output is selectively programmable for clickless or regular-mode operation. A selectable set of internal resistive voltage dividers supplies DC bias for each output when using AC-coupled inputs. To improve crosstalk, the voltage dividers include four externally accessible bypass points.

FEATUREs
♦ Selectable Soft-Switching Mode for “Clickless” Audio Operation
♦ 22Ω Typical On-Resistance (+5V Supply)
♦ 5Ω Typical On-Resistance Matching Between Channels
♦ 2Ω Typical On-Resistance Flatness
♦ Audio Performance
   -85dB Off-Isolation at 20kHz
   -85dB Crosstalk at 20kHz
   0.07% THD with 600Ω Load
♦ Video Performance
   -72dB Off-Isolation at 10MHz
   -55dB Crosstalk at 10MHz
♦ Serial Interface
   2-Wire I2C-Compatible (MAX4548)
   3-Wire SPI/QSPI/MICROWIRE-Compatible (MAX4549)
♦ Single-Supply Operation from +2.7V to +5.5V

APPLICATIONs
  Set-Top Boxes
  PC Multimedia Boards
  Video Conferencing Systems
  High-End Audio Systems
  Security Systems