LINEAR Manuals

This document introduces the LT1794 dual 500mA, 200MHz xDSL line driver amplifier, which meets all the requirements for full-rate, downstream ADSL line drivers. The device has a minimum output current of ±500mA, an output swing of ±11.1V, VS = ±12V, RL = 100Ω, an output swing of ±10.9V, VS = ±12V, IL = 250mA, low distortion: -82dBc@1MHz, 2VP-P input 50Ω, power-saving adjustable supply current, power-enhanced compact packaging: 20-Lead TSSOP and 20-Lead SW, 200MHz gain bandwidth, 500V/µS slew rate, specified at ±15V, ±12V and ±5V, high-density ADSL central office line drivers, high-efficiency ADSL, HDSL2, G.lite, SHDSL line drivers, buffers, test equipment amplifiers, cable drivers.

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The LTC1749 is an 80Msps, 12-bit A/D converter designed for digitizing wide dynamic range signals up to frequencies of 500MHz. The input range of the ADC can be optimized with the on-chip PGA sample-and-hold circuit and flexible reference circuitry.

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This is a design note about radio frequency identification (RFID) technology. It introduces a high performance RFID receiver, which uses direct conversion technology to demodulate an RF carrier directly to a baseband signal without an intermediate frequency down-conversion.

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The LTC1872 is a constant frequency current mode step-up DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1872 when the input voltage falls below 2.0V. The LTC1872 boasts a ±2.5% output voltage accuracy and consumes only 270µA of quiescent current. For applications where efficiency is a prime consideration, the LTC1872 is configured for Burst Mode operation, which enhances efficiency at low output current. In shutdown, the device draws a mere 8µA. The high 550kHz constant operating frequency allows the use of a small external inductor. The LTC1872 is available in a small footprint 6-lead SOT-23.

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The LT1512 is a 500kHz current mode switching regulator specially configured to create a constant-current/constant-voltage battery charger. It has a current sense feedback circuit for accurately controlling output current and supports flyback or SEPIC topology chargers. It allows charging even when the input voltage is lower than the battery voltage, has a maximum switch current of 1.5A, and 1% voltage accuracy for lithium battery applications.

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The LTC1622 is a constant frequency current mode step-down DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage feature that shuts the LTC1622 down when the input voltage falls below 2V. The LTC1622 boasts a ±1.9% output voltage accuracy and consumes only 350µA of quiescent current. For applications where efficiency is a prime consideration and the load current varies from light to heavy, the LTC1622 can be configured for Burst Mode TM operation. Burst Mode operation enhances low current efficiency and extends battery run time. Burst Mode operation is inhibited during synchronization or when the SYNC/MODE pin is pulled low to reduce noise and possible RF interference. High constant operating frequency of 550kHz allows the use of a small inductor. The device can also be synchronized up to 750kHz for special applications. The high frequency operation and the available 8-lead MSOP package create a high performance solution in an extremely small amount of PCB area. To further maximize the life of the battery source, the P-channel MOSFET is turned on continuously in dropout (100% duty cycle). In shutdown, the device draws a mere 15µA.

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The LTC3731H is a PolyPhase synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. It has features such as Burst Mode, OPTI-LOOP, and PolyPhase.

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This datasheet introduces the features and characteristics of the low power, broadband down converting mixer LT5525, including frequency range, input IP3, conversion gain, LO-RF and LO-IF isolation, SSB noise figure, single-ended 50Ω RF and LO interface, integrated LO buffer, supply current, enable function, and package

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The LT5522 is an active downconverting mixer optimized for high linearity downconverter applications. It features an internal on-chip RF input transformer, 50Ω single-ended RF and LO ports, high input IP3, low power consumption, etc.

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1 LT1579 300mA Dual Input Smart Battery Backup Regulator Daisy-Chained Control Outputs

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The document describes the features of the LT1248 power factor controller in detail, including high power factor, wide load range, international operation, and no switches.

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The LT ®3468/LT3468-1/LT3468-2 are highly integrated ICs designed to charge photoflash capacitors in digital and film cameras.

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LTC1775 is a high power no RSENSETM current mode synchronous step-down switching regulator, which has the highest efficiency current mode controller, no need for sense resistor, maximum current sense voltage of 300mV, stable high current operation, dual N-channel MOSFET synchronous drive, wide VIN range: 4V to 36V, wide VOUT range: 1.19V to VIN, ±1% 1.19V reference, programmable fixed frequency with injection lock, very low dropout operation: 99% duty cycle, forced continuous mode control pin, optional programmable soft start, pin selectable output voltage, foldback current limit, output overvoltage protection, logic controlled micropower shutdown: IQ < 30µA, available in 16-lead narrow SSOP and SO packages.

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The LTC1625 is a synchronous step-down switching regulator controller that drives external N-Channel power MOSFETs using few external components. Current mode control with MOSFET VDS sensing eliminates the need for a sense resistor and improves efficiency. The frequency of a nominal 150kHz internal oscillator can be synchronized to an external clock over a 1.5:1 frequency range. Burst Mode operation at low load currents reduces switching losses and low dropout operation extends operating time in battery-powered systems. A forced continuous mode control pin can assist secondary winding regulation by disabling Burst Mode operation when the main output is lightly loaded. Fault protection is provided by foldback current limiting and an output overvoltage comparator. The LTC1625 is available in 16-Lead Narrow SSOP and SO Packages.

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The LTC ®1407/LTC1407A are 12-bit/14-bit, 3Msps ADCs with two 1.5Msps simultaneously sampled differential inputs

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The LTC1293/4/6 is a family of data acquisition systems which contain a serial I/O successive approximation A/D converter. It uses LTCMOS TM switched capacitor technology to perform either 12-bit unipolar, or 11-bit plus sign bipolar A/D conversions. The input multiplexer can be configured for either single ended or differential inputs (or combinations thereof). An on-chip sample and hold is included for all single ended input channels. When the LTC1293/4/6 is idle it can be powered down in applications where low power consumption is desired. The LTC1296 includes a System Shutdown Output pin which can be used to power down external circuitry, such as signal conditioning circuitry prior to the input mux. The serial I/O is designed to communicate without external hardware to most MPU serial ports and all MPU parallel I/O ports allowing up to eight channels of data to be transmitted over as few as three wires.

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The LTC1407-1/LTC1407A-1 are 12-bit/14-bit, 3Msps ADCs with shutdown feature.

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