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ISL54211IRUZ-T Arkusz danych(PDF) 10 Page - Intersil Corporation |
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ISL54211IRUZ-T Arkusz danych(HTML) 10 Page - Intersil Corporation |
10 / 19 page 10 FN6662.1 August 25, 2008 high-speed USB differential data signals with minimal edge and phase distortion. The ISL54211 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. See “Typical Application Block Diagrams” on page 9 regarding functionality. The ISL54211 has a single logic control pin (IN) that selects between the audio and the USB switches. This pin can be driven low or high to switch between the audio CODEC drivers and USB transceiver of the MP3 player or cellphone. The ISL54211 also contains a logic control pin (CTRL) that when driven low while IN 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 2.5 Ω 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 32 Ω 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 32 Ω headphone speaker load. See Figures 16, 17, 18, and 19 (THD+N “Typical Performance Curves” beginning on page 12). 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 switches have click and pop circuitry on the L and R side that is activated when the IN voltage is ≤ 0.5V or floating and the CTRL voltage ≤ to 0.5V or floating. The ISL54211 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 IN voltage is ≤ 0.5V or floating and the CTRL voltage ≥ to 1.4V. USB Switches The two USB switches (D+, D-) are 5.5 Ω bidirectional switches that were specifically designed to pass high-speed USB differential signals typically 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 Figure 20 for High-speed Eye Pattern taken with the switch in the signal path. These switches can also swing rail to rail and pass USB full-speed signals (12Mbps) with minimal distortion. See Figure 21 for Full-speed Eye Pattern taken with the switch in the signal path. The maximum signal range for the USB switches is from -1.5V to VDD. The signal voltage at D- and D+ should not be allow to exceed the VDD voltage rail or go below ground by more than -1.5V. The USB switches are active (turned ON) whenever the IN voltage is ≥ to 1.4V. ISL54211 Operation The following sections discuss using the ISL54211 in the “Typical Application Block Diagrams” on page 9. VDD SUPPLY The DC power supply connected at VDD (pin 10 for µTQFN, pin 1 for TDFN) provides the required bias voltage for proper switch operation. The part can operate with a supply voltage in the range of 2.7V to 5.0V. In a typical USB/Audio application for portable battery powered devices, the VDD voltage will come from a battery or an LDO and be in the range of 2.7V to 4.3V. For best possible USB full-speed operation (12Mbps), it is recommended that the VDD voltage be ≥2.7V in order to get a USB data signal level above 2.7V. LOGIC CONTROL The state of the ISL54211 device is determined by the voltage at the IN pin (pin 1 for µTQFN; pin 2 for TDFN) and the CTRL pin (pin 9 for µTQFN, pin 10 for TDFN). These logic pins are 1.8V logic compatible when VDD is in the range of 2.7V to 3.6V and can be controlled by a standard µprocessor. The part has three states or modes of operation: Audio Mode; USB Mode; and Mute Mode. Refer to “Truth Table” on page 2. The IN pin and CTRL pin are internally pulled low through 4M Ω resistors to ground and can be left floating or tri-stated by the µprocessor. The CTRL control pin is only active when IN is logic “0”. Logic Control Voltage Levels IN = Logic “0” (Low) when ≤ 0.5V or Floating. IN = Logic “1” (High) when ≥ 1.4V ISL54211 |
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