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ISL54205AIRZ-T Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL54205AIRZ-T Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 14 page 8 FN6342.1 December 7, 2006 Application Block Diagram Detailed Description The ISL54205A device is a dual single pole/double throw (SPDT) analog switch device that operates from a single DC power supply in the range of 2.7V to 3.6V. It was designed to function as a dual 2 to 1 multiplexer to select between USB differential data signals and audio L and R stereo signals. It comes in tiny μTQFN and TDFN packages for use in MP3 players, PDAs, cell phones, and other personal media players. The part consists of two 3 Ω audio switches and two 5Ω USB switches. The audio switches can accept signals that swing below ground. They were designed to pass audio left and right stereo signals, that are ground referenced, with minimal distortion. The USB switches were designed to pass high- speed USB differential data signals with minimal edge and phase distortion. The ISL54205A was specifically designed for MP3 players, cell phones and other personal media player applications that need to combine the audio headphone jack and the USB data connector into a single shared connector, thereby saving space and component cost. A typical application block diagram of this functionality is shown above. The ISL54205A incorporates circuitry for the detection of the USB VBUS voltage, which is used to switch between the audio CODEC drivers and USB transceiver of the MP3 player or cell phone. The ISL54205A contains a logic control pin (CTRL) that when driven Low while VBUS is Low, opens all switches and puts the part into a low power state, drawing typically 1nA of IDD current. A detailed description of the two types of switches is provided in the sections below. The USB transmission and audio playback are intended to be mutually exclusive operations. Audio Switches The two audio switches (L, R) are 3 Ω switches that can pass signals that swing below ground. Crosstalk between the audio switches over the audio band is < -110dB. Over a signal range of ±1V (0.707Vrms) with VDD >2.7V, these switches have an extremely low rON resistance variation. They can pass ground referenced audio signals with very low distortion (<0.06% THD+N) when delivering 15.6mW into a 32 Ω headphone speaker load. See Figures 8, 9, 10, and 11 THD+N performance curves. These switches are uni-directional switches. The audio drivers should be connected at the L and R side of the switch (pins 7 and 8) and the speaker loads should be connected at the COM side of the switch (pins 3 and 4). The audio switches are active (turned ON) whenever the VBUS voltage is ≤ to VDD + 0.2V or floating and the CTRL voltage ≥ to 1.4V. Note: Whenever the audio switches are ON the USB transceivers need to be in the high impedance state or static high or low state. USB Switches The two USB switches (D+, D-) are 5 Ω bidirectional switches that are designed to pass high-speed USB differential signals in the range of 0V to 400mV. The switches have low capacitance and high bandwidth to pass USB high-speed signals (480Mbps) with minimum edge and phase distortion to meet USB 2.0 signal quality specifications. See Figure 12 for High-speed Eye Pattern taken with switch in the signal path. The maximum signal range for the USB switches is from -1.5V to VDD. The signal voltage at D- and D+ should not be allowed to exceed the VDD voltage rail or go below ground by more than -1.5V. ISL54205A USB TRANSCEIVER HIGH-SPEED CODEC COM - COM + VBUS GND D- D+ L R VDD CTRL LOGIC CIRCUITRY μCONTROLLER 22k Ω 4M Ω 4M Ω 50k Ω 50k Ω ISL54205A |
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