Electronic Components Datasheet Search |
|
ISL54400IRUZ-T Datasheet(PDF) 10 Page - Intersil Corporation |
|
ISL54400IRUZ-T Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 15 page 10 FN6240.3 July 12, 2006 Application Block Diagram Detailed Description The ISL5440X family of devices are dual single pole/double throw (SPDT) analog switches that operate from a single power supply. They were designed to function as dual 2 to 1 multiplexers to select between USB differential data signals and audio L and R stereo signals. They come in tiny µTQFN and TDFN packages for use in MP3 players, PDAs, cellphones, and other personal media players. All devices in this family consist of two 1 Ω normally closed (NC) audio switches and two 5 Ω normally open (NO) 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 full-speed USB differential data signals with minimal edge and phase distortion. The ISL54400 and ISL54401 were 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 above. The ISL54400 and ISL54401 incorporate 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 ISL54400 contains additional circuitry to generate the required USB VTERM of 3.3V for use with the USB speed setting pull-up resistor. The ISL54402 is an audio/data switch and its functionality is typical of a standard dual SPDT device. A detailed description of the two types of switches and of each part type in the ISL5440x family are provided in the sections below. The USB transmission and audio playback are intended to be mutually exclusive operations. Audio Switches The two NC (normally closed) audio switches (L, R, NCx) are 1 Ω switches that can pass signals that swing below ground. Crosstalk between the audio switches is < -110dB and has a -3dB bandwidth of 394MHz. The recommended maximum signal range is from -1.5V to 1.5V. You can apply positive signals greater than 1.5V but the RON resistance of the switch increases rapidly above 1.5V. The audio signal should not be allowed to exceed the VDD rail or swing more negative than -1.5V. Over a signal range of ±1V these switches have an extremely low RON flatness. They can pass ground referenced audio signals with very low distortion (<0.01% THD+N) when delivering 12mW into a 32 Ω headphone speaker load. See Figures 8 and 9 THD+N performance curves. These switches are uni-directional switches. The audio sources should be connected at the NC side of the switch (pins 7 and 8) and the speaker loads should be connected at the COM side of the switch (pins 3 and 4). For the ISL54400 and ISL54401 parts the audio switches are active (turned ON) whenever the VBUS voltage is ≤ to VDD + 0.2V. The VBUS pin is internally pulled low through a pulldown resistor allowing the VBUS pin to float. When the VBUS pin is floating the audio switches are ON. Note: Whenever the audio switches are ON the USB transceivers connected at D- and D+ (pins 8 and 9) need to be in the high impedance state or static high or low state to keep from interfering with the audio transmission. For the ISL54402 part the NC1 audio switch is active (turned ON) whenever logic pin IN1 (pin 10) is LOW. The NC2 audio switch is active (turned ON) whenever the logic pin IN2 (pin 2) is LOW. Unlike the ISL54400 and ISL54401 parts ISL54400 USB TRANSCEIVER FULL-SPEED CODEC D-/L D+/R VBUS GND D- D+ L R VDD VTERM ISL54400, ISL54401, ISL54402 |
Similar Part No. - ISL54400IRUZ-T |
|
Similar Description - ISL54400IRUZ-T |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |