Electronic Components Datasheet Search |
|
ADG3243BRJ-REEL7 Datasheet(PDF) 8 Page - Analog Devices |
|
ADG3243BRJ-REEL7 Datasheet(HTML) 8 Page - Analog Devices |
8 / 12 page REV. 0 –8– ADG3243 BUS SWITCH APPLICATIONS Mixed Voltage Operation, Level Translation Bus switches can provide an ideal solution for interfacing between mixed voltage systems. The ADG3243 is suitable for applica- tions where voltage translation from 3.3 V technology to a lower voltage technology is needed. This device can translate from 2.5 V to 1.8 V or bidirectionally from 3.3 V directly to 2.5 V. Figure 4 shows a block diagram of a typical application in which a user needs to interface between a 3.3 V ADC and a 2.5 V micro- processor. The microprocessor may not have 3.3 V tolerant inputs, therefore placing the ADG3243 between the two devices allows the devices to communicate easily. The bus switch directly connects the two blocks, thus introducing minimal propagation delay, timing skew, or noise. 3.3V ADC 2.5V 3.3V 2.5V MICROPROCESSOR 3.3V Figure 4. Level Translation between a 3.3 V ADC and a 2.5 V Microprocessor 3.3 V to 2.5 V Translation When VCC is 3.3 V and the input signal range is 0 V to VCC, the maximum output signal will be clamped to within a voltage threshold below the VCC supply. ADG3243 2.5V 2.5V 3.3V 2.5V 3.3V Figure 5. 3.3 V to 2.5 V Voltage Translation In this case, the output will be limited to 2.5 V, as shown in Figure 6. This device can be used for translation from 2.5 V to 3.3 V devices and also between two 3.3 V devices. VIN 2.5V VOUT 0V 3.3V SWITCH INPUT 3.3V SUPPLY Figure 6. 3.3 V to 2.5 V Voltage Translation 2.5 V to 1.8 V Translation When VCC is 2.5 V and the input signal range is 0 V to VCC, the maximum output signal will, as before, be clamped to within a voltage threshold below the VCC supply. In this case, the output will be limited to approximately 1.8 V, as shown in Figure 8. ADG3243 1.8V 2.5V 2.5V Figure 7. 2.5 V to 1.8 V Voltage Translation VIN 1.8V VOUT 0V 2.5V SWITCH INPUT 2.5V SUPPLY Figure 8. 2.5 V to 1.8 V Voltage Translation Bus Isolation A common requirement of bus architectures is low capacitance loading of the bus. Such systems require bus bridge devices that extend the number of loads on the bus without exceeding the specifications. Because the ADG3243 is designed specifically for applications that do not need drive yet require simple logic functions, it solves this requirement. The device isolates access to the bus, thus minimizing capacitance loading. BUS/ BACKPLANE LOAD A LOAD C LOAD B LOAD D BUS SWITCH LOCATION Figure 9. Location of Bus Switched in a Bus Isolation Application Hot Plug and Hot Swap Isolation The ADG3243 is suitable for hot swap and hot plug applications. The output signal of the ADG3243 is limited to a voltage that is below the VCC supply, as shown in Figures 6 and 8. Therefore the switch acts like a buffer to take the impact from hot insertion, protecting vital and expensive chipsets from damage. In hot plug applications, the system cannot be shut down when new hardware is being added. To overcome this, a bus switch can be positioned on the backplane between the bus devices and the hot plug connectors. The bus switch is turned off during hot plug. Figure 10 shows a typical example of this type of application. |
Similar Part No. - ADG3243BRJ-REEL7 |
|
Similar Description - ADG3243BRJ-REEL7 |
|
|
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 |