 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
E7802ALPT Datasheet(PDF) 7 Page - Semtech Corporation |
|
||||||||||||||||||||||||||||||
E7802ALPT Datasheet(HTML) 7 Page - Semtech Corporation |
|
|
7 / 22 page  7 TEST AND MEASUREMENT PRODUCTS © 2008 Semtech Corp. , Rev. 5, 3/7/08 E7802 www.semtech.com Figure 3. Power Supply Protection Scheme Warning: It is extremely important that the voltage on any device pin does not exceed the range of VEE -0.5V or VCC +0.5V at any time, either during power up, normal operation, or during power down. Failure to adhere to this requirement could result in latch-up of the device which could be destructive if the system’s power supplies are capable of supplying large amounts of current. Even if the device is not immediately destroyed, the cumulative damage caused by the stress of repeated latchup may affect device reliability. Computing Maximum Power Comsumption The power consumption of the E7802 increases with increasing frequency and output voltage swing. The diagram below shows the power consumption of the E7802 at a couple of different voltage swings across the frequency range with both channels toggling. VCC VDD GND VEE 1N5820 or Equivalent Schottky Diodes Application Information The three diode configuration shown in Figure 3 should be used on a once-per-boad basis to help ensure that proper supply polarities are maintained. Power Supply Decoupling VCC, VEE, and DVEE should be decoupled to GND with a .1 µF chip capacitor in parallel with a .00 µF chip capacitor for best AC performance. A VCC, VEE, and DVEE plane, or at least a solid power bus, is recommended for optimal performance. VH and VL Inputs As the VH and VL inputs are unbuffered to the driver and need to supply the output current which can be quite large during edge transitions, bypass capacitors for these inputs are needed to supply the transient currents in proportion to the output current requirements (See Applications Note PE-A1). For applications where VH and VL are shared over multiple channels, a solid power plane to distribute these levels with local bypassing is recommended for best AC performance . Power Supply Sequencing/Latch-Up Protection In order to avoid the possibility of latch-up when powering this device up (or down), be careful that the conditions listed in the Absolute Maximum Ratings are never violated. The power supplies should never be in reverse-polarity with respect to ground, and the input signals should never go beyond the power supply rails. Furthermore, the lower-voltage supplies should never be greater than the higher-voltage supplies. This can easily be implemented by utilizing the diode circuit depicted in Figure 3 for each PCB utilizing the E7802. The following conditions must be met at all times during power-up and power-down: 1. VEE <= DVEE <= VDD <= VCC 2. VEE <= Analog Inputs <= VCC 3. GND <= Digital Inputs <= VDD The following sequencing can be used as a guideline when powering up: 1. VEE(substrate) 2. VCC 3. VDD 4. Digital Iputs 5. Analog Inputs E7802 Power Dissipation vs. Frequency (Open Transmission Line) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 10 20 30 40 50 Toggle Freq (MHz) VCC=5.4V, VEE=-5V, DVEE=-3.6V, VDD=3.3V, 3V Swing VCC=15V, VEE=-5V, DVEE=0V, VDD=3.3V, 3V Swing |
Similar Part No. - E7802ALPT |
|
Similar Description - E7802ALPT |
|
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
