MAX4550 General Description
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 voltagedividers 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 onresistance 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 MAX4550 uses a 2-wire I2 C-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.
MAX4550 Maximum Ratings
V+ to GND ............................................................... -0.3V to +6V
V+ to V- ...............................................................-0.3V to +13.2V
V- to GND .................................................................+0.3V to -6V
NO_ _ , S_, BIAS_, COM_ _, Q_, A1, DOUT to GND
(Note 1) ...............................................(V- - 0.3V) to (V+ + 0.3V)
CS , SCLK, DIN, SCL, SDA, A0 to GND .......................-0.3V to +6V
Continuous Current into Any Terminal ............................ ±10mA
Peak Current, NO_ _ , S_ , COM_ _
(pulsed at 1ms, 10% duty cycle max) .......................... ± 40mA
Continuous Power Dissipation (T A = +70°C)
28-Pin SSOP (derate 9.52mW/° C above +70°C)..........762mW
28-Pin Wide SO (derate 12.5mW/°C above +70°C)... 1000mW
Operating Temperature Ranges
MAX4550C_I/MAX4570C_I .............................. -0°C to +70°C
MAX4550E_I/MAX4570E_I ............................. -40°C to +85°C
Storage Temperature Range ........................ -65° C to +160°C
Lead Temperature (soldering, 10sec) ........................... +300°C
MAX4550 Features
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
-110dB Off-Isolation at 20kHz
-78dB Off-Isolation at 4MHz
-95dB Crosstalk at 20kHz
-54dB Crosstalk at 4MHz
Serial Interface
2-Wire, Fast-Mode, I2 C-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
MAX4550 Typical Application
Set-Top Boxes PC Multimedia Boards High-End Audio Systems Video Conferencing Systems
MAX4550 Connection Diagram
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