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ISL54205BIRUZ-T 数据表(PDF) 9 Page - Intersil Corporation |
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ISL54205BIRUZ-T 数据表(HTML) 9 Page - Intersil Corporation |
9 / 16 page 9 FN6557.0 September 25, 2007 Application Block Diagram Detailed Description The ISL54205B 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 ISL54205B 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. See “Application Block Diagram” on page 9. The ISL54205B 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 ISL54205B 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 following sections. 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 in the “Typical Performance Curves on page 11. 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. USB Switches The two USB switches (D+, D-) are bidirectional switches that can pass rail-to-rail signals. When powered with a 3.6V supply these switches have a nominal r(ON) of 4.6Ω over the signal range of 0V to 400mV with a r(ON) flatness of 0.4Ω. The r(ON) matching between the D+ and D- switches over this signal range is only 0.06 Ω ensuring minimal impact by the switches to USB high speed signal transitions. As the signal level increases the r(ON) resistance increases. At signal level of 3.3V the switch resistance is nominally 23 Ω. The USB switches were specifically designed to pass USB 2.0 high-speed (480Mbps) differential signals typically in the range of 0V to 400mV. They have low capacitance and high bandwidth to pass the USB high-speed signals with ISL54205B 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 ISL54205B |
类似零件编号 - ISL54205BIRUZ-T |
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类似说明 - ISL54205BIRUZ-T |
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