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ISL54217EVAL1Z データシート(PDF) 11 Page - Intersil Corporation |
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ISL54217EVAL1Z データシート(HTML) 11 Page - Intersil Corporation |
11 / 24 page 11 FN6817.4 June 17, 2010 Block Diagram Detailed Description The ISL54217 device consists of dual SP3T (single pole/triple throw) analog switches. It operates from a single DC power supply in the range of 2.7V to 4.6V. It was designed to function as differential 3-to-1 multiplexer to select between two different USB differential data signals and audio L and R stereo signals. It comes in a tiny µTQFN and TQFN packages for use in MP3 players, PDAs, cell phones, and other personal media players. A device consists of two 2.3Ω audio switches and four 6.2Ω 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 ISL54217 was specifically designed for MP3 players, personal media players and cellphone applications that need to combine the stereo audio and USB data channels into a single shared connector, thereby saving space and component cost. The “Block Diagram” of this functionality is shown on page 11. The ISL54217 contains two logic control pins (C1 and C0) that determine the state of the device. The part has the following five states or modes of operation: All SWITCHES OFF; USB1; USB2; Audio; and Audio Mute. These states are discussed in detail in “Logic Control” on page 12. A detailed description of the various types of switches are provided in “Audio Switches” beginning on page 11. Audio Switches The two audio switches (L, R) are 2.3Ω switches that can pass signals that swing below ground. 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 (<0.05% THD+N) when delivering 15.6mW into a 32Ω headphone speaker load. See Figures 20, 21, 22, 23 and 24 THD+N performance curves. Crosstalk between the L and R audio switches over the frequency range of 20Hz to 20kHz when driving a 32Ω load is <-88dB. These switches have excellent off-isolation >105dB over the audio band when connected to 32Ω loads and 77dB when connected to 20kΩ loads (In Audio Mute mode). See Figures 25 and 26 in “Typical Performance Curves” section beginning on page 14. The audio drivers should be connected at the L and R side of the switch (pins 2 and 3) and the speaker loads should be connected at the COM side of the switch (pins 7 and 8). The switches have click and pop circuitry on the L and R side that is activated when the part comes out of Audio mode by taking the C1 and C0 logic pins low (All OFF mode). The ISL54217 should be put in this mode before powering down or powering up of the audio CODEC drivers. In this mode the audio, USB1, USB2 switches will be OPEN (OFF) and the audio click and pop circuitry will be ON. The high off-isolation of the audio switches along with the click and pop circuitry will isolate the transients generated during power-up and power down of the audio CODECs from getting through to the headphones thus CLICK/ ISL54217 USB TRANSCEIVER HIGH-SPEED AUDIO COM - COM + C1 GND 1D+ 1D- R L VDD C0 LOGIC CONTROL µCONTROLLER CODEC VBUS 3.3V 2D- USB 4M Ω 50k Ω HIGH-SPEED TRANSCEIVER 2D+ 50k Ω 1k Ω POP #2 #1 OR UART TRANSCEIVER ISL54217 |
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同様の説明 - ISL54217EVAL1Z |
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