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