The MAX4550/MAX4570 serial-interface, programmable, dual 4x2 audio/video crosspoint switches are ideal for multimedia applications. Each device contains two identical crosspoint switch arrays, each with four inputs and two outputs. To improve off-isolation, use the additional crosspoint inputs SA and SB as shunts. Each output is selectively programmable for clickless or regular mode operation. A set of internal resistive voltage-dividers supplies DC bias for each output when using AC-coupled inputs. Additionally, four auxiliary outputs control additional circuitry via the MAX4550/MAX4570's 2-wire or 3-wire interface. The MAX4550/MAX4570 feature 80Ω on-resistance, 10Ω on-resistance matching between channels, 5Ω on-resistance flatness, and 0.014% total harmonic distortion. Additionally, they feature off-isolation of at least -110dB in the audio frequency range and -78dB at 4MHz, with -95dB crosstalk in the audio frequency range and -54dB at 4MHz. The MAX4550CWI uses a 2-wire I2C-compatible serial interface, while the MAX4570 uses a 3-wire SPI/QSPI or MICROWIRE-compatible serial interface. These parts are available in 28-pin SSOP and wide SO packages and are tested over either the commercial (0°C to +70°C) or extended (-40°C to +85°C) operating temperature range.
Feature
- Selectable Soft Switching Mode for Clickless Audio Operation
- 43Ω Typical On-Resistance (±5V Supplies)
- 5Ω Typical On-Resistance Matching Between Channels
- 4Ω Typical On-Resistance Flatness
- 0.014% Total Harmonic Distortion with 1kΩ Load
- -110dB Off-Isolation at 20kHz
- -78dB Off-Isolation at 4MHz
- -95dB Crosstalk at 20kHz
- -54dB Crosstalk at 4MHz
- Serial Interface
- 2-Wire, Fast-Mode, I2C-Compatible (MAX4550)
- 3-Wire, SPI/QSPI/MICROWIRE-Compatible (MAX4570)
- Four Auxiliary Outputs that Extend μP Ports
- Single-Supply Operation: +2.7V to +5.5V
- Dual-Supply Operation: ±2.7V to ±5.5V
Applications
- High-End Audio Systems
- PC Multimedia Boards
- Set-Top Boxes
- Video Conferencing Systems
