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ISL54207IRZ 数据表(PDF) 10 Page - Intersil Corporation |
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ISL54207IRZ 数据表(HTML) 10 Page - Intersil Corporation |
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10 / 14 page  10 FN6403.0 December 5, 2006 USB Mode If the VBUS pin = Logic “1” and CTRL pin = Logic “0” or Logic “1,” the part will go into USB mode. In USB mode, the NO1 and NO2 5 Ω switches are ON and the NC1 and NC2 3 Ω audio switches are OFF (high impedance). When a USB cable from a computer or USB hub is connected at the common connector, the voltage at the VBUS pin will be driven to be in the range of 4.4V to 5.25V. The ISL54207 part will go into the USB mode. In USB mode, the computer or USB hub transceiver and the media player USB transceiver are connected and digital data will be able to be transmitted back and forth. When the USB cable is disconnected, the ISL54207 automatically turns the NO1 and NO2 switches OFF. Low Power Mode If the VBUS pin = Logic “0” and CTRL pin = Logic “0,” the part will be in the Low Power mode. In the Low Power mode, the NCx switches and the NOx switches are OFF (high impedance). In this state, the device draws typically 1nA of current. EXTERNAL VBUS SERIES RESISTOR The ISL54207 contains a clamp circuit between VBUS and VDD. Whenever the VBUS voltage is greater than the VDD voltage by more than 2.55V, current will flow through this clamp circuitry into the VDD power supply bus. During normal USB operation, VDD is in the range of 2.7V to 3.6V and VBUS is in the range of 4.4V to 5.25V. The clamp circuit is not active and no current will flow through the clamp into the VDD supply. In a USB application, the situation can exist where the VBUS voltage from the computer could be applied at the VBUS pin before the VDD voltage is up to its normal operating voltage range and current will flow through the clamp into the VDD power supply bus. This current could be quite high when VDD is OFF or at 0V and could potentially damage other components connected in the circuit. In the application circuit, a 22kΩ resistor has been put in series with the VBUS pin to limit the current to a safe level during this situation. It is recommended that a current limiting resistor in the range of 10kΩ to 50kΩ be connected in series with the VBUS pin. It will have minimal impact on the logic level at the VBUS pin during normal USB operation and protect the circuit during the time VBUS is present before VDD is up to its normal operating voltage. Note: No external resistor is required in applications where VBUS will not exceed VDD by more than 2.55V. POWER The power supply connected at VDD (pin 1) provides power to the ISL54207 part. Its voltage should be kept in the range of 2.7V to 3.6V when used in a USB/Audio/Video application to ensure you get proper switching when the VBUS voltage is at its lower limit of 4.4V. Typical Performance Curves TA = +25°C, Unless Otherwise Specified FIGURE 10. THD+N vs SUPPLY VOLTAGE vs FREQUENCY FIGURE 11. THD+N vs SIGNAL LEVELS vs FREQUENCY FREQUENCY (Hz) 20 200 2k 20k 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0.11 VDD = 2.6V VDD = 2.7V VDD = 3.6V VDD = 3V RLOAD = 32Ω VLOAD = 0.707VRMS FREQUENCY (Hz) 20 200 2k 20k RLOAD = 32Ω VDD = 3V 0 0.1 0.2 0.3 0.4 2VP-P 1VP-P 3VP-P 2.5VP-P ISL54207 |
类似零件编号 - ISL54207IRZ |
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类似说明 - ISL54207IRZ |
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