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ISL54210IRTZ 데이터시트(PDF) 11 Page - Intersil Corporation |
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ISL54210IRTZ 데이터시트(HTML) 11 Page - Intersil Corporation |
11 / 21 page 11 FN6661.2 March 18, 2010 Typical Application Block Diagram Detailed Description The ISL54210 device is a dual single pole/double throw (SPDT) analog switch 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, cellphones, and other personal media players. The part consists of two 2.5Ω audio switches and two 5.5Ω 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 ISL54210 was specifically designed for MP3 players, personal media players and cellphone 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 on page 11. The ISL54210 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 cellphone. The ISL54210 contains a logic control pin (CTRL) that when driven low while VBUS is low, opens all switches and activates the audio click and pop circuitry. A detailed description of the two types of switches are provided in the following sections. In a typical application, the USB transmission and audio playback are intended to be mutually exclusive operations. Audio Switches The two audio switches (L, R) are 2.5Ω switches that can pass signals that swing below ground. Crosstalk between the audio switches is <-100dB over the audio band. These switches have excellent off-isolation >105dB over the audio band with a 32Ω load. 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 32Ω headphone speaker load. See Figures 16, 17, 18, and 19 THD+N in “Typical Performance Curves” beginning on page 14. The audio drivers should be connected at the L and R side of the switch (pins 5 and 6 for µTQFN, pins 6 and 7 for TDFN) and the speaker loads should be connected at the COM side of the switch (pins 2 and 3 for µTQFN, pins 3 and 4 for TDFN). The audio switches have click and pop circuitry on the L and R side that is activated when the VBUS voltage is ≤ VDD + 0.2V or floating and the CTRL voltage ≤ to 0.5V or floating. The ISL54210 should be put in this mode before powering down or powering up of the audio CODEC drivers. In this mode, both the audio and USB in-line switches will be 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 eliminating click and pop noise in the headphones. The audio switches are active (turned ON) whenever the VBUS voltage is ≤ VDD + 0.2V or floating and the CTRL voltage ≥ to 1.4V. ISL54210 USB TRANSCEIVER HIGH-SPEED AUDIO COM - COM + VBUS GND D- D+ L R VDD CTRL LOGIC CONTROL µCONTROLLER 4M Ω 4M Ω CODEC CLICK AND POP VBUS 3.3V 200k Ω 200k Ω ISL54210 |
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