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Blog blog, news from technology , fresh release technologies and components , interesting devices and many useful electronic circuits and schematics diagrams .

MRF49XA Sub-GHz transceiver radio

Microchip Technology announced expansion of its RF Products Division wireless portfolio with the new MRF49XA Sub-GHz transceiver radio. The MRF49XA covers the 434/868/915 MHz unlicensed Industrial, Scientific and Medical (ISM) Radio Frequency (RF) band, which is ideal for low data-rate, low-power embedded wireless applications
MRF49XA chip FSK baseband transceiver supports: Zero-IF architecture , Multi-channel and multi-band Synthesizer with Phase Locked Loop (PLL) , Power Amplifier (PA) , Low Noise Amplifier (LNA) , I/Q down converter mixers , I/Q demodulator , Baseband filters and amplifiers
Main features of MRF49XA transceiver are : Supports Proprietary Sub-GHz Wireless Protocols , 4-Wire Serial Peripheral Interface (SPI) , Compatible Interface , CMOS/TTL Compatible I/Os , Clock and Reset Signals for Microcontroller , Integrated 10 MHz Oscillator Circuitry , Integrated Low Battery Voltage Detector , Supports Power-Saving Modes , Operating Voltage: 2.2V-3.8V , Low-Current Consumption.
MRF49XA Sub-GHz transceiver radio

ADP2108 step-down converter

Analog Devices expanded its family of miniature switching regulators with a new 3-MHz step-down dc-to-dc converter optimized for better energy efficiencies in battery-powered portable devices.
The ADP2108 runs on input voltages of 2.3 V to 5.5 V, which allows for single lithium or lithium polymer cell, multiple alkaline or NiMH cell, PCMCIA, USB, and other standard power sources. The maximum load current of 600 mA is achievable across the input voltage range.
The ADP2108 is available in fixed output voltages of 3.3 V, 3.0 V, 2.5 V, 2.3 V, 1.82 V, 1.8 V, 1.5 V, 1.3 V, 1.2 V, 1.1 V, and 1.0 V.
Main features of ADP2108 are : Peak efficiency: 95% , 3 MHz fixed frequency operation , Typical quiescent current: 18 μA , Maximum load current: 600 mA , Input voltage: 2.3 V to 5.5 V , 100% duty cycle low dropout mode , Internal synchronous rectifier , Internal compensation , Internal soft start , Current overload protection , Thermal shutdown protection .
ADP2108 can be used in power supply applications for devices like : PDAs and palmtop computers , Wireless handsets , Digital audio, portable media players , Digital cameras, GPS navigation units .
ADP2108 step-down converter

MAX9945 operational amplifier

The MAX9945 is a operational amplifier with a low operating power and low input voltage noise. MAX9945 device accepts a wide supply voltage range from 4.75V to 38V and draws a low 400μA quiescent current. The MAX9945 is unity-gain stable and is capable of rail-to-rail output voltage swing. The MAX9945 is ideal for portable medical and industrial applications that require low noise analog front-ends
for performance applications such as photodiode transimpedance and chemical sensor interface circuits.
Main features of MAX9945 are :+4.75V to +38V Single-Supply Voltage Range , ±2.4V to ±19V Dual-Supply Voltage Range , Rail-to-Rail Output Voltage Swing , 400μA Low Quiescent Current , 50fA Low Input Bias Current , 3MHz Unity-Gain Bandwidth
MAX9945 operational amplifier


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