LINEAR Manuals

The LT1130A/LT1140A series are the industry's highest performance 5V RS232 drivers and receivers with small capacitors, low power, high anti-interference and multiple operating modes. The series adopts special bipolar construction technology, ensuring that drivers and receivers are not damaged under RS232 specified fault conditions. Driver outputs and receiver inputs can withstand ±30V short circuit voltage and there are multiple ±10kV ESD protections on RS232 I/O pins. The high-performance driver output stage can achieve speeds of up to 250kbps when driving large capacitive loads. Typical supply current is only 12mA, which is comparable to CMOS devices. Several members of the series also include flexible operating mode controls. The DRIVER DISABLE pin can disable the drivers and charge pump, and the ON/OFF pin can shut down all circuitry. When shut down, the drivers and receivers are in a high-impedance state.

The document describes a direct replacement for the SILICONIX J/SST174 series P-Channel JFET switch. The product features low on resistance, low gate operating current, etc.

LTC694-3.3/LTC695-3.3 are 3.3V microprocessor supervisory circuits that provide features such as power-on reset, battery backup, RAM write protection, power failure warning, and watchdog timing.

The LTC3806 is a current mode synchronous flyback controller that drives N-channel power MOSFETs and requires very few external components. It is intended for medium power applications where multiple outputs are required. Synchronous rectification provides higher efficiency and improved output cross regulation than nonsynchronous converters. The IC contains all the necessary control circuitry including a 250kHz oscillator, precision undervoltage lockout circuit with hysteresis, gate drivers for primary and synchronous switches, current mode control circuitry and soft-start circuitry. Programmable soft-start reduces inrush currents. This makes it easier to design compliant Power Over Ethernet supplies. Low start-up current reduces power dissipation in the start-up resistor and reduces the size of the external start-up capacitor. The LTC3806 is available in a 12-pin, exposed pad DFN package.

The LTC3455 is a high-efficiency DC/DC converter that can be used in portable devices. It features two synchronous step-down DC/DC converters, a USB power controller, a full-featured Li-Ion battery charger, a Hot Swap output, a low-battery indicator, and numerous internal protection features.

The LTC1595/LTC1596/LTC1596-1 are serial input, 16-bit multiplying current output DACs. They feature low DNL and INL, low glitch impulse, fast settling to 1LSB, and compatibility with industry standard 12-bit DACs.

This document introduces two data acquisition system products LTC1292/LTC1297. The features include 12-bit resolution, maximum conversion time of 12µs, low supply current of 6.0mA, shutdown supply current of 5µA (LTC1297), built-in sample-and-hold, single supply 5V operation, 60kHz maximum throughput rate (LTC1292), power shutdown after each conversion (LTC1297), direct 3-wire interface to most MPU serial ports and all MPU parallel ports, analog input common mode to supply rails

The design note introduces a solution for multiple power supplies to ramp up simultaneously to avoid damaging sensitive components. The solution uses N-channel MOSFETs to turn on the power supplies at the same time.

The LTC2606/LTC2616/LTC2626 are 16-/14-/12-bit rail-to-rail voltage output DACs with I2C interface. They have built-in high-performance output buffers and are guaranteed monotonic. These parts establish new board-density benchmarks for 16- and 14-bit DACs and advance performance standards for output drive and load regulation in single-supply, voltage-output DACs. The parts use a 2-wire, I2C compatible serial interface. The LTC2606/LTC2616/LTC2626 operate in both the standard mode (clock rate of 100kHz) and the fast mode (clock rate of 400kHz). An asynchronous DAC update pin (LDAC) is also included. The LTC2606/LTC2616/LTC2626 incorporate a power-on reset circuit. During power-up, the voltage outputs rise less than 10mV above zero scale; and after power-up, they stay at zero scale until a valid write and update take place. The power-on reset circuit resets the LTC2606-1/LTC2616-1/LTC2626-1 to midscale. The voltage outputs stay at midscale until a valid write and update take place.

The LTC ®1864/LTC1865 are 16-bit A/D converters that are offered in MSOP and SO-8 packages and operate on a single 5V supply. At 250ksps, the supply current is only 850µA. The supply current drops at lower speeds because the LTC1864/LTC1865 automatically power down between conversions. These 16-bit switched capacitor successive approximation ADCs include sample-and-holds. The LTC1864 has a differential analog input with an adjustable reference pin. The LTC1865 offers a software- selectable 2-channel MUX and an adjustable reference pin on the MSOP version. The 3-wire, serial I/O, small MSOP or SO-8 package and extremely high sample rate-to-power ratio make these ADCs ideal choices for compact, low power, high speed systems. These ADCs can be used in ratiometric applications or with external references. The high impedance analog inputs and the ability to operate with reduced spans down to 1V full scale, allow direct connection to signal sources in many applications, eliminating the need for external gain stages.

The LTC1775 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using few external components. It features current mode control, no sense resistor required, wide voltage range, and programmable fixed frequency, etc.

The LTC ®1668 is a 16-bit, 50Msps differential current output DAC implemented on a high performance BiCMOS process with laser trimmed, thin-film resistors. It features 87dB SFDR (spurious free dynamic range) for an output signal frequency of 1MHz. The DAC operates from ±5V supplies and can be configured to provide full-scale output currents up to 10mA.