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Q&A
Homepage / Q&A
Microchip mTouch™ Sensing Solutions
- Q: Can you make a compare among other touch panel solution provider (such as Synaptics/Cypress/ATlab/Quantum/Leadis,and so on..) Thank you very much.
- A: Sorry we do not have this comparison. However, we have a flexible software solution that can be applied to most applications.
- Q: what about metal covering plate?
- A: metal covering plate is not suitable for capacitive sensing but you can consider inductive touch.
- Q: Referring to GROUND Section of AN1102, For a double layer PCB, which touchpad resides on Top layer, is it necessary to place a GND layer at Bottom layer to protect it from other signals' tracking such as LED, buzzer, etc.? Thank you. Regards, Jiamin
- A: Hi, It is good to have a gnd plane at the bottom side as a form of shield from noise generated from other parts of your system. Gnd can also be place on the top layer, for example in between buttons as a form of adject key rejection as shown in the AN1102, under the section of "Ground"
Class D Audio Amplifiers - NXP's expertise improves quality and performance
- Q: Slide 29: How about the cost competivity for the Class D change/upgreat from Class A/B? slightly higher?
- A: NXP continuously strives to bring costs down for Class D amplifiers. Generally, the cost of Class D amplifiers is higher than Class AB, but there are other savings that can be achieved using Class D amps. For example, Class D amps allow for smaller heatsinks (or even no heatsink at all), they need a smaller power supply unit and make it possible to design slimmer and sleeker products due to higher efficiency. Cost aside, energy efficient products are also becoming increasingly important and are in greater demand from consumers.
- Q: Any possibility to implemented in car audio?
- A: Yes, it is possible to implement the Class D in car audio. If AEC-Q100 qualification is mandatory, we have other parts to recommend, such as TDF8599. Please contact your nearest NXP office, authorized distributor or myself at alvin.ban.sing.tan@nxp.com
- Q: How much efficient this Class D amplifier than linear amplifier?
- A: The typical efficiency of Class D amps is between 85% - 90%. The lower the Rds-on of the power Mosfet, the higher the efficiency. Linear amplifiers on the other hand have a typical efficiency of 50-60%.
Tips and Tricks in using Guard output
- Q: I would like to ask: 2600A in the user so that embodied what good tricks?Compared with other equipment, what are its advantages?
- A: Keithley 2600A consists of several functions. 1/ Voltage source, 2/ Current source, 3/ Volt meter, 4/ Current meter, 5/ Resistance meter, 6/ Function generator. It can replace many laboratory instruments and do not cost as much. Because of the integration of many functions in a single box, the Source Meter typically Source and Measure faster than systems that consists of several Instruments. It also has the advantage of having less cables to connect
- Q: there are many possible circuit combination, where are we to identify the right node to connect the guard meter ?
- A: Obtain the schematic diagram and connect the Guard to the correct nodes.
- Q: Currently, I am using Agilent mutimeter to do measurement for 3V data line, which suppose to obtain 0.6mA to 0.8mA, but the meter only shown 0.002mA which is out of our range and in order to obtain the target,we need to add another shunt resistor, could I kwon is it possible for keithley multimeter to perform this kind of task.
- A: Please contact the local Keithley Application Engineer to find the measurement solution.
Dimming LEDs with a Conventional Triac Wall Dimmer: Solutions and Design Tips
- Q: what's the difference between using LM3445 and using MCU PWM Part to control the LEDs?
- A: The main advantage of using LM3445 over a MCU is the source and sink current is as high as 0.8A whereas of a MCU will hardly be <100mA. And also The Angle Detector/Decoder feature of LM3445 Enables full range (0-100%) dim capability
- Q: How LM3445 protect the circuit and the LEDs? what tech is used?
- A: LM3445 provide the feature of Over-current & over-temperature.
- Q: what¡®s the switch-off and turn-on speed of LM3445?
- A: Hi, That depends on the GATE DRIVE OUTPUT Rise time tDV for a Cload of 1nF if 15ns and Fall time tDV for a Cload of 1nF is 15ns
Solving Tough Half-bridge Power Brick Design Challenges
- Q: Could you show more samples of single chip primary solution for higher power density design, which is in your speech?
- A: National has complete portfolio of isolated converters to cater to small to medium to large power requirements. LM5026 is a device which can be used to deliver to 125 to 150W. LM5034 is 2 times LM5026 which means it has two forward converters in one pack. This can be used to deliver upto 400W. Still for powers in the range of 200 to 400W you can use LM5035. LM5041 is a cascaded buck converter with full bridge topology. This device can be used to generate upto 1000W. To get the entire portfolio of National's Isolated topology converter, pl. visit our website in this link: http://www.national.com/cat/index.cgi?i=i//201
- Q: How do it make the transformer 100% utilization?
- A: Magnetic core characteristic varies over lot, temperature and bias. Designer has to consider the worst case(usually high temp, high bias..) to keep the core from saturation. It's a big challenege utilizing the core 100% or even 90% in some condition. That needs high intellegince of the controller or control system to acomplish the adaptive design, which may cost too much to power products.
- Q: Want to know more info of LM5035B
- A: There will be a product folder of LM5035B available in NSC website very soon. You may refer to its relatives LM5035 and LM5035A for most of the operation information. The main chagnge from LM5035A to B include higher max duty cycle limit and the two secondary side sync-rec drive signal of B version being disabled at input "under voltage" condition, while LM5035A dosen't disable the two drive at that condition.
Design Considerations for Future Base Station Standards
- Q: Is IF frequency must be less than half of sample clock?
- A: If the signal contains high frequency components, we will need to sample at a higher rate to avoid losing information that is in the signal. In general, to preserve the full information in the signal, it is necessary to sample at twice the maximum frequency of the signal. This is known as the Nyquist rate. The Sampling Theorem states that a signal can be exactly reproduced if it is sampled at a frequency F, where F is greater than twice the maximum frequency in the signal.
- Q: How to do ADC's input impedance matching?
- A: Typical analog input configuration of high speed ADC is an Op amp circuit where dc signal coupling can be realised. Advantages of LMH6xxx series of Opamps including Impedance matching are filtering, signal conditioning gain and level shifting By using a front end differential line driver, ADC's input impendance can be matched in a easier way. Pls go through our Appln note 1704 for more details
- Q: Did LMH6517 officially release?
- A: LMH6517SQE which is a 32pin LLP package part is not officially released. However free samples can be requested through our web page http://www.national.com/pf/LM/LMH6517.html For pricing details pls do contact us
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