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ISL54406EVAL1Z Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL54406EVAL1Z Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 16 page ISL54406 9 FN6578.1 July 14, 2010 Application Block Diagram Detailed Description The ISL54406 device is a dual single pole-single throw (SPST) analog switch that operates from a single DC power supply in the range of +2.7V to +5V. It was designed to function as a transient suppressor to eliminate Click and Pop noise on headphones. It comes in a 10 Ld (3mmx3mm) TDFN or a tiny 10 Ld (1.8mmx1.4mm) µTQFN package for use in MP3 players, PDAs, cellphones, and other personal media players. The part consist of a pair of 2.5Ω audio switches. The audio switches can accept signals that swing below ground by as much as -1.5V. They were designed to pass audio left and right stereo signals that are ground referenced with minimal distortion. The ISL54406 was specifically designed for MP3 players, personal media players and cellphone applications that require but do not have Click and Pop elimination. See “Application Block Diagram” on page 9. The ISL54406 contains logic control pins SEL1 and SEL2 that will determine the state of the switch. See the “Truth Table” on page 2 for a description of each state. A detailed description of the audio switches are provided in the section that follows. Audio Switches The two 2.5Ω audio switches (L, R) are designed to pass signals that swing 1.5V above and below ground. Crosstalk between the audio switches is -90dB over the audio band. These switches have excellent off-isolation of 110dB over the audio bandwidth 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 (0.03Ω). They can pass ground referenced audio signals with very low distortion (<0.04% THD+N) when delivering 4mW into a 32Ω headphone speaker load. See Figures 10, 11, 12 and 13 for THD+N performance curves. The audio drivers should be connected at the LIN and RIN side of the switch and the speaker loads should be connected at the LOUT and ROUT side of the switch for proper Click and Pop elimination. The switches have Click and Pop circuitry on the LIN and RIN side that is activated when the SEL1 pin is driven High and SEL2 pin is driven Low. The audio switches are turned OFF in this state. The ISL54406 should be put in this mode before powering down or powering up of the audio source drivers. The high off-isolation of the audio switches along with the Click and Pop circuitry will prevent the transients generated during power-up and power-down of the audio source from getting through to the headphones, thus eliminating Click and Pop noise in the headphones. The audio switches are turned ON and the Click and Pop circuitry disabled whenever SEL1 and SEL2 is driven High. ISL54406 Operation The discussion that follows will describe using the ISL54406 in the “Application Block Diagram” on page 9. LOGIC CONTROL The state of the ISL54406 device is determined by the logic level at the SEL1 and SEL2 pins. The part has four states or modes of operation. The Audio Playback Mode, Audio Mute Mode, Click and Pop Mode, and Shutdown Mode. Refer to “Truth Table” on page 2 for the logic state of each mode of operation. The SEL1 and SEL2 pins are internally pulled low through 4MΩ resistors to ground and can be left floating to pull the logic pins Low. Logic Control Voltage Levels: SEL1 and SEL2 = Logic “0” (Low) when ≤ 0.5V or Floating. SEL1 and SEL2 = Logic “1” (High) when ≥ 1.4V 4MΩ ISL54406 AUDIO LOUT ROUT SEL1 GND LIN VDD SEL2 LOGIC CONTROL µCONTROLLER 4MΩ CODEC CLICK AND POP 3.3V 220kΩ 220kΩ CIRCUITRY RIN LSHUNT RSHUNT 220µF 220µF 0.1µF 6Ω 6Ω SPEAKER LEFT SPEAKER RIGHT |
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