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ISL54214IRTZ Fiches technique(PDF) 10 Page - Intersil Corporation |
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ISL54214IRTZ Fiches technique(HTML) 10 Page - Intersil Corporation |
10 / 22 page ISL54214 10 FN6816.3 June 28, 2010 Application Block Diagrams Detailed Description The ISL54214 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. Its offered in tiny µTQFN and TQFN packages for use in MP3 players, PDAs, cellphones, 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 ISL54214 was specifically designed for MP3 players, personal media players and cellphone applications that need to combine the stereo audio and USB channels into a single shared connector, thereby saving space and component cost. The Typical application block diagram of this functionality is previously shown. The ISL54214 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 11. A detailed description of the various types of switches is provided in the following sections. 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 16, 17, 18, 19 and 20 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 21 and 22 in “Typical Performance Curves” section. 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 audio switches are active (turned ON) whenever the C1 and C0 logic pins are logic “1” (High). USB Switches The four USB switches (1D+, 1D-, 2D+, 2D-) are 6.2Ω bidirectional switches that were specifically designed to pass high-speed USB differential data 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 Figures 23 and 24 for the high-speed eye pattern taken with the switch in the signal path. ISL54214 USB TRANSCEIVER HIGH-SPEED AUDIO COM - COM + C1 GND 1D+ 1D- R L VDD C0 LOGIC CONTROL µCONTROLLER CODEC VBUS 3.3V 2D- USB 4MΩ 50kΩ HIGH-SPEED TRANSCEIVER 2D+ 50kΩ # 2 # 1 1kΩ 1kΩ OR UART TRANSCEIVER ISL54214 |
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