Serially Controlled, Triple 3x2 Audio/Video Crosspoint Switches

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.

The MAX4548/MAX4549 feature 35Ω max on-resistance, 7Ω on-resistance matching between channels, 5Ω on-resistance flatness, and 0.07% total harmonic distortion (THD). Additionally, they feature off-isolation of -85dB at 20kHz and -72dB at 10MHz, with crosstalk of -85dB at 20kHz and -55dB at 10MHz. The MAX4548 uses a 2-wire I²-compatible serial interface, while the MAX4549 uses a 3-wire SPI™/QSPI™/MICROWIRE™-compatible serial interface. These parts are available in 36-pin SSOP packages and are specified for the extended (-40°C to +85°C) operating range.

Applications

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

* 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