FSA321UMX

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This literature is subject to all applicable copyright laws and is not for resale in any manner. FSA321 — USB2.0 Hi-Speed (480Mbps) and Audio Switches with Negative Signal Capability and Built-in Termination on Unselected Audio Paths Features Description           The FSA321 is a Double-Pole, Double Throw (DPDT) multiplexer that combines a low-distortion audio and a USB2.0 High-Speed (HS) switch path. This configuration enables audio and USB data to share a common connector port. The architecture is designed to allow audio signals to swing below ground. This means a common USB and headphone jack can be used for personal media players and portable peripheral devices. Audio: 1.8 Typical On Resistance HS-USB: 8 Typical On Resistance HS-USB: 5pF Typical On Capacitance USB Path -3db Bandwidth: > 720MHz Negative Swing Capable Audio Channel Power-off Protection on Common D+/R, D-/L Ports Automatic USB Detection (Configurable) OVT on all I/O Ports Flow-Through Pin Out Eliminates PCB Vias Built-In Termination on Unselected Audio Paths to Inhibit Audio Pop Applications Since USB2.0 is an industry standard for shared datapath in portable devices, FSA321 can be configured for automatic VBUS detection. The FSA321 includes a power-off feature as well as over-voltage tolerance to minimize current consumption when VSW exceeds VCC. Typical applications involve switching in portables and consumer applications, such as cell phones, digital cameras, and notebooks with hubs or controllers. .  MP3, Cell Phone, PDA, Digital Camera, and Notebook  LCD Monitor, TV, and Set-Top Box Ordering Information Part Number Package Number Top Mark Package Description FSA321UMX MLP010A GL 10-Lead Quad, Ultrathin Molded Leadless Package (MLP), 1.4 x 1.8mm Figure 1. Analog Symbol © 2007 Fairchild Semiconductor Corporation FSA321 • Rev 1.0.6 www.fairchildsemi.com FSA321 — USB2.0 Hi-Speed and Audio Switches with Negative Signal Capability March 2013 L 3 GND 4 A/LP Sel 5 R D- 2 1 6 7 10 D+ 9 V CC 8 USB Sel D-/L D+/R Figure 2. UMLP Pin Definitions Pin # Name 9 VCC Description Power supply 5 A/LP Sel Audio Select Override and Power-Save Mode. This pin can be used to override USB Sel for applications where analog audio is transmitted on the USB D+, D- lines. This same select pin is used to put the FSA321 in low-power mode when USB Sel is LOW, not transmitting audio signals or USB data. The FSA321 has a weak internal pull-down, setting its default state to LOW and allowing this pin to float when not in use. 8 USB Sel USB Path select pin. Can be connected to USB connector VBUS pin for automatic USB detection. 10, 1 D+, D- 2, 3 R, L 7, 6 USB data bus input sources Audio right and left input sources D+/R, D-/L USB and audio common connector ports Truth Table VCC USB Sel(1) A/LP Sel LOW (2) (2) Audio Mode USB Mode Remarks OFF OFF Disabled Inputs High-Z HIGH HIGH LOW OFF ON USB Communication HIGH(2) HIGH(2) HIGH(2) ON OFF Audio Override on USB HIGH(2) LOW HIGH(2) OFF OFF Low Power Mode (2) LOW LOW ON OFF Audio Out HIGH Notes: 1. Forcing USB Sel HIGH when VBUS is present allows for automatic USB detection. 2. HIGH is the threshold as defined to meet USB2.0 VCC requirements and audio supply threshold in a system (see DC Tables). © 2007 Fairchild Semiconductor Corporation FSA321 • Rev.1.0.6 www.fairchildsemi.com 2 FSA321 — USB2.0 Hi-Speed and Audio Switches with Negative Signal Capability Pin Configuration The FSA321 is a combined USB and audio switch that enables sharing the D+/D- lines of a USB connector with stereo audio CODEC outputs. The USB Sel pin has an internal pull-down resistor that results in a default audiomode configuration. The switch can be configured for auto USB detection by connecting the VBUS pin to the USB Sel pin. The audio switch path also handles negative signals, eliminating the need for large coupling capacitors and greatly reducing the potential for audio pop. Termination resistors on the audio R and L ports are enabled when the switch is in USB mode, this also helps reduce audio pop when enabling the audio path. The FSA321 allows for an audio override state by forcing A/LP Sel high when USB Sel is high. This is useful for USB car kit applications or if the device is in a cradle charger when “Send/End” is pressed. Application Diagram VCC 0.1µF USB 2.0 Hi-Speed Controller D+ USB Sel D+/R FSA321 R Audio CODEC D-/L Shared USB and Audio Connector D- L Figure 3. Typical Application Diagram © 2007 Fairchild Semiconductor Corporation FSA321 • Rev.1.0.6 www.fairchildsemi.com 3 FSA321 — USB2.0 Hi-Speed and Audio Switches with Negative Signal Capability Functional Description Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol VCC Parameter Min. Max. Unit Supply Voltage -0.5 4.6 V USB Sel USB Select Control Signal -0.5 6.0 V A/LP Sel Power Save Mode Control Signal -0.5 6.0 V USB Path Active -1.0 4.6 Audio Path Active VCC-4.6V 4.6 -0.50 5.25 Switch I/O Voltage(3) VSW DC Switch I/O Voltage IIK USB Path Active (3) Audio Path Active Input Clamp Diode Current ISW Switch I/O Current (Continuous) ISWPEAK Peak Switch Current (Pulsed at 1ms Duration,