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ISL54213IRTZ-T датащи(PDF) 9 Page - Intersil Corporation |
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ISL54213IRTZ-T датащи(HTML) 9 Page - Intersil Corporation |
9 / 15 page 9 FN6663.0 March 26, 2008 data connector into a single shared connector, thereby saving space and component cost. Typical Application Block Diagrams of this functionality are shown in Figures 8 and 9. The ISL54213 has a single logic control pin (IN) that selects between the audio switches 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 cellular phone. The ISL54213 also contains a logic control pin (CTRL) that when driven Low while IN is Low, opens all switches and puts the part into the mute state. A detailed description of the two types of switches are provided in the following sections. Audio Switches The two audio switches (L, R) are 2.5 Ω switches that can pass signals that swing below ground by as much as 1.5V. They were designed to pass ground reference stereo signals with minimal insertion loss and very low distortion over a ±1V signal range. Crosstalk between the audio channels is -112dB over the audio band. Crosstalk between the audio channel and USB channel is -95dB at 100kHz. These switches have excellent off-isolation, 112dB, 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 10 and 11. These switches are bi-directional switches. In typical applications, the audio drivers would be connected at the L and R side of the switch (pins 7 and 8) and the speaker loads would be connected at the COM side of the switch (pins 3 and 4). 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 bidirectional switches that can pass rail-to-rail signals. When powered with a 3.3V supply, these switches have a nominal rON of 5.5Ω over the signal range of 0V to 400mV with a rON flatness of 0.5Ω. The rON matching between the D+ and D- switches over this signal range is only 0.05 Ω ensuring minimal impact by the switches to USB high speed signal transitions. As the signal level increases, the rON resistance increases. At signal level of 3.3V, the switch resistance is nominally 25 Ω. The USB switches were specifically designed to pass USB 2.0 high-speed (480Mbps) differential signals typically in the range of 0V to 400mV. They have low capacitance and high bandwidth to pass the USB high-speed signals with minimum edge and phase distortion to meet USB 2.0 high speed signal quality specifications. See Figure 12. The USB switches can also pass USB full-speed signals (12Mbps) with minimal distortion and meet all the USB requirements for USB 2.0 full-speed signaling. See Figure 13 for Full-speed Eye Pattern taken with 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. ISL54213 Operation The following will discuss using the ISL54213 in the Typical Application Block Diagrams shown in Figures 8 and 9. VDD SUPPLY The DC power supply connected at VDD (pin 1) provides the required bias voltage for proper switch operation. The part can operate with a supply voltage in the range of 2.5V 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 3.6V. For best possible USB full-speed operation (12Mbps), it is recommended that the VDD voltage be ≥2.5V in order to get a USB data signal level above 2.5V. LOGIC CONTROL The state of the ISL54213 device is determined by the voltage at the IN pin (pin 2) and the CTRL pin (pin 10). 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. The Audio Mode, USB Mode and Mute Mode. Refer to the “Truth Table” on page 2. The IN and CTRL pins are internally pulled low through a 4M Ω resistor to ground and can be left floating or tri-stated by the microprocessor. The CTRL control pin is only active when IN is logic “0”. Logic control voltage levels: IN = Logic “0” (Low) when VIN ≤ 0.5V or Floating. IN = Logic “1” (High) when VIN ≥ 1.4V CTRL = Logic “0” (Low) when ≤ 0.5V or Floating. CTRL = Logic “1” (High) when ≥ 1.4V Audio Mode If the IN pin = Logic “0” and CTRL pin = Logic “1”, the part will be in the Audio mode. In Audio mode, the L (left) and R (right) 2.5 Ω audio switches are ON and the D- and D+ 5.5Ω switches are OFF (high impedance). When nothing is plugged into the common connector or a headphone is plugged into the common connector, the µprocessor will sense that there is no voltage at the VBUS pin of the connector and will drive and hold the IN control pin ISL54213 |
Аналогичный номер детали - ISL54213IRTZ-T |
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Аналогичное описание - ISL54213IRTZ-T |
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