McZ found a sim card power supply with level translator: The TXS4555 is a complete Smart Identity Module (SIM) card solution for interfacing wireless baseband processors with a SIM card to store I/O for mobile handset applications. The device complies with ISO/IEC Smart-Card Interface requirements as well as GSM and 3G mobile standards. It includes […]
An app note on a LED-driver circuit: This LED-driver circuit includes a hysteretic controller U1 (MAX16820), related power components, and a control circuit based on the quad op amp U2 (LMX324). U1 drives five HB LEDs from a 24V source, using only inductor L1, MOSFET Q1, and catch diode D1. Thanks rsdio!
Akos tips us to the LM0901a1411090451C polis operational amplifier: The LM0901A1141090451C is a macropower, low performance, degraded circuit operational amplifier designed to have a no load power dissipation of less than 0.553W at Vs = ±1pV and less than 200W at Vs = ±2pV. Open loop gain is greater than 0.001k and input bias current […]
MichaelZ tipped us to the ADS9412x a 14-/12-Bit, 65/125MSPS, ultralow-power analog to digital converter: • Ultralow Power with 1.8V Single Supply: – 103mW Total Power at 65MSPS – 153mW Total Power at 125MSPS • Programmable Gain up to 6dB for SNR/SFDR Trade-Off • DC Offset Correction • Differential input voltage range 2 VPP Thanks McZ!
The MAX2209A is an efficient and fast RF power detector: Fast RF step-response allows faster tracking of the output envelope, ensuring more efficient and more accurate PA control Shutdown feature allows lower overall current consumption Small size saves board space You can check out the complete datasheet. Thanks rsdio!
The term UART (Universal Asynchronous Receiver Transmitter) is the technical term for the good old serial port found on most MCUs. The term USART similarly refers to a serial port capable of handling both synchronous and asynchronous operation. Over the past few years, Microchip has been integrating an updated serial port into many of their […]
This app note describes a simple, inexpensive constant power driver: A combination current-sense amplifier and multiplier (MAX4211F) senses both the current through and voltage across the load, and supplies at one of its outputs (POUT) a voltage proportional to the continuous product of those variables, i.e., proportional to the load’s instantaneous power. External op amps […]
rsdio tipped us to an app note on precision current sink and source circuits: The precision current mirrors shown allow you to transform one type of 4–20mA transmitter to another, or to create a repeater for the purpose of extending the length of the current loop. The circuits include an input-sink/output-sink mirror and an input-source/output-source […]
This amplifier with an analog voltage multiplier could be useful in a bench power supply: Combining a high-side current-sense amplifier with an analog voltage multiplier, the MAX4211 can easily measure the power dissipated in a load. One multiplier input connects to the load voltage, and the other to an internal analog of the load current—that […]
McZ found a sim card reader with integrated voltage translation: The TXS02326 is a complete dual-supply standby Smart Identity Module (SIM) card solution for interfacing wireless baseband processors with two individual SIM subscriber cards to store data for mobile handset applications. It is a custom device which is used to extend a single SIM/UICC interface […]
In this advanced app note Microchip details the theory behind converting solar energy into usable electric power. Starting with a discussion of the electrical characteristics of photovoltaic (PV) cells, they move onto the tech behind inverters and the mathematics involved with their proper design and use. Finally a microinverter reference design is presented, using a […]
McZ and rsdio tipped us to a bunch of new and wonderful voltage regulator chips. Tiny regulators, high current regulators, and high voltage regulators. TPS84620: 4.5V to 14.5V input, 6A switching regulator needs only three external parts MAX15040: 2.4V to 3.6V input, 4A switching regulator is the smallest yet MAX15050/MAX15051: 2.9V to 5.5V input, 4A […]
MichaelZ writes: While poking around SparkFun’s website I found USB Host Shield which is only marginally interesting unless you are an Arduino fan. But the USB host controller chip is interesting. The MAX3421E is a USB Peripheral/Host Controller with SPI Interface. This is an alternate to the FTDI VNC USB host controllers. It has only […]
McZ writes: I have used the SM320F28335-HT microcontroller in several projects including military applications. With the floating point it is blinding fast. The standard temperature comes in a QFP and the high temp version comes in a Ceramic Pin Grid Array which is more friendly than the BGA’s. The TI compiler/IDE is cheap by high […]
Microchip has released a new application note explaining smart card communication using PIC MCUs. This is a good read for beginners, taking you from the basics of what a smart card is, to how data I/O occurs and how to build a PC-to-smart card interface using the PIC18F14K50.
Precision circuit monitors negative-supply threshold: Using an IC (MAX971) that includes an open-drain comparator and a precision 1% voltage reference, this circuit monitors the magnitude of a negative supply voltage and provides a digital warning of fault conditions. To monitor multiple negative voltages, use the MAX974, which includes four comparators. Thanks for the tip rsdio!
rsdio writes: Why regulate the voltage from your supply when you really need a controlled current to drive an LED? Any regulator is less than 100% efficient, and the losses increase as more current is drawn. It looks like the circuit in this application note would allow you to skip the voltage regulator and thus […]
This digital temperature sensor design uses a twisted cable pair to read the sensor over long distances: This circuit is a simple and economical interface for remote IC thermal sensors. The temperature sensor (MAX6576), an absolute temperature-to-period converter that integrates the sensor with the necessary signal electronics, connects to the receiver (a MAX9140 comparator) using […]
An introduction to USB battery charging: a survival guide Arguably the most useful part of USB’s power capabilities is the ability to charge batteries in portable devices, but there is more to battery charging than picking a power source, USB or otherwise. This is particularly true for Li+ batteries, where improper charging can not only […]
The TI ADS1298R could be perfect for that EKG project you dreamed of. It has a 8 analog to digital converters with programmable gain amplifiers, an internal reference, and a clock source. The ADS1294/6/8/4R/6R/8R incorporate all of the features that are commonly required in medical electrocardiogram (ECG) and electroencephalogram (EEG) applications. FEATURES Eight Low-Noise PGAs […]