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LT6350: Rail-to-Rail Single-Ended to Differential Amplifier Drives High Speed 16- to 18-bit SAR ADCs
Linear Technology introduces the LT6350, a 33MHz, low noise, rail-to-rail input and output ADC driver that settles to 16-bits in just 350ns. It is suitable for driving the latest highest performance SAR ADCs such as the LTC2393-16. The LT6350 incorporates two op amps and matched resistors to create a differential output from a single-ended high impedance input. As a result, a differential gain of 2 is achieved with no external feedback resistors, and higher gain can be obtained by using feedback resistors. Each of the two internal op amps achieve a low 1.9nV/Hz input-referred noise density, resulting in a total output-referred noise of just 8.2nV/Hz. The LT6350 enables high performance ADCs to achieve better than 110dB SNR over a 1MHz bandwidth.
Leer la noticia completa	26 de Jan de 2010 - 08:57 PM

LT3640: 35V Input (55V Transient), 2MHz Dual Channel Step-Down Regulator with Power-On Reset & Watchdog Timer
Linear Technology Corporation announces the LT3640, a dual channel, current mode step-down switching regulator with a power-on reset and watchdog timer. Its 4V to 35V input voltage range with 55V transient ride through makes it ideal for load dump and cold crank conditions commonly found in automotive applications. The LT3640 uses a unique dual channel design with a high input voltage (4VIN to 35VIN, 55VIN transient) nonsynchronous channel that delivers 1.1A of output current, combined with a lower input voltage (2.5VIN to 5.5VIN) synchronous channel that provides up to 0.9A of continuous output current. Although the part allows separate inputs for each channel, most applications will use the output of the high voltage channel to power the lower voltage channel, offering dual outputs while optimizing efficiency and switching frequency. For example, using a nominal 12V input and a 2MHz switching frequency, the LT3640 can deliver a 3.3V output at 600mA with 85% efficiency via its high voltage channel and a 1.8V output at 800mA with 87% secondary conversion efficiency via its lower voltage channel.
Leer la noticia completa	23 de Jan de 2010 - 11:45 AM

LTC3824: 60V Input, Low Quiescent Current Step-Down Controller Operates from -55°C to 125°C
Linear Technology Corporation announces a new high reliability (MP) grade version of the LTC3824, a 4V to 60V input range, low quiescent current, 100% duty step-down DC/DC controller in a small thermally enhanced MSOP-10 package. The MP grade device is specified over the -55°C to +125°C operating junction temperature range and is ideal for space-constrained automotive, industrial, telecom, datacom and battery-powered applications that demand an output voltage ranging from 0.8V to VIN, at up to 5 amps. The 4V minimum input voltage supports automotive cold crank conditions and the 60V maximum input voltage survives inductive load dumps without the need for external clamping circuits.
Leer la noticia completa	23 de Mar de 2009 - 12:50 PM