 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ISL54209IRTZ Datasheet(PDF) 11 Page - Intersil Corporation |
|
||||||||||||||||||||||||||||||
ISL54209IRTZ Datasheet(HTML) 11 Page - Intersil Corporation |
|
|
11 / 19 page  11 FN6627.4 June 10, 2010 Detailed Description The ISL54209 device is a dual single pole/double throw (SPDT) analog switch that operates from a single DC power supply in the range of 2.5V to 5.0V. It was designed to function as a dual 2 to 1 multiplexer to select between USB differential data signals and audio L and R stereo signals. It comes in tiny µTQFN and TDFN packages for use in MP3 players, PDAs, cellular phones and other personal media players. The part consists of two 2.5Ω audio switches and two 5Ω 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 high-speed USB differential data signals with minimal edge and phase distortion. The ISL54209 was specifically designed for MP3 players, personal media players and cellular phone 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. “Typical Application Block Diagrams” on page 10 of this functionality are shown in Figures 8 and 9. The ISL54209 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 ISL54209 also contains a logic control pin (CTRL) that when driven Low while IN is Low, opens all switches and puts the part into a low power state, drawing typically 1nA of IDD current. Detailed descriptions of the two types of switches are provided in the following sections. Audio Switches The two audio switches (L, R) are 2.5Ω 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 -110dB over the audio band. Crosstalk between the audio channel and USB channel is -95dB at 100kHz. These switches have excellent OFF-isolation, 114dB, over the audio band 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. They can pass ground referenced audio signals with very low distortion (<0.06% THD+N) when delivering 15.6mW into a 32Ω 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 and the speaker loads would be connected at the COM side of the switch. 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 5Ω over the signal range of 0V to 400mV with a rON flatness of 0.45Ω. The rON matching between the D+ and D- switches over this signal range is only 0.05Ω ensuring minimal impact by the switches to USB high speed signal transitions. As the signal level increases, the rON resistance increases. At a signal level of 3.3V, the switch resistance is nominally 25Ω. 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 USB switches are active (turned ON) whenever the IN voltage is ≥ to 1.4V. COM+, COM-, 1D-, 1D+, 2D-, AND 2D+ ARE OVERVOLTAGE TOLERANT UP TO 5.5V AND DOWN TO -1.5V For normal operation, the signal range for the USB switches is from -1V to VDD. During normal operation, the signal voltage at D- and D+ should not be allowed to exceed the VDD voltage rail or go below ground by more than -1.0V. However, the ISL54209, with a VDD supply voltage in the range of 0V to 5.0V, can withstand an overvoltage of up to 5.5V or down to -1.5V applied at its COM pins (COM-, COM+) and/or USB signal pins (1D-, 1D+, 2D-, 2D+) without damage. In this overvoltage condition, the part draws <1mA of current and causes no stress to the IC. Note: When in the overvoltage state, the fault voltage at a COM pin will pass thru the USB switch to the signal side of the switch, so the media player’s USB transceiver must have protection circuitry to protect it from damage. ISL54209 Operation The following will discuss using the ISL54209 in the “Typical Application Block Diagrams” on page 10 shown in Figures 8 and 9. VDD SUPPLY The DC power supply connected at VDD pin provides the required bias voltage for proper switch operation. The ISL54209 |
Similar Part No. - ISL54209IRTZ |
|
Similar Description - ISL54209IRTZ |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
