The LTC ®1448 is a dual rail-to-rail voltage output, 12-bit digital-to-analog converter (DAC). It includes rail-to-rail output buffer amplifiers and an easy-to-use 3-wire serial interface. It is available in 8-pin SO and PDIP packages and provides the smallest footprint of any dual 12-bit DAC. The LTC1448 has an external reference input pin (REF) and its outputs swing from 0V to REF. The REF input can be tied to VCC providing rail-to-rail operation from supplies of 2.7V to 5.5V. (For devices with internal reference see the LTC1446 data sheet.) The LTC1448 dissipates 2.5mW from a 5V supply. The low power supply current and the small SO-8 package make the LTC1448 i an excellent choice for high performance low power applications.
LTC1798 series micropower bandgap references combine high accuracy and low drift with very low supply current and small package size. The combination of ultralow quiescent current and low dropout voltage of only 200mV (max) makes them ideal for battery-powered equipment. The output voltage is set by an external resistor divider for the adjustable LTC1798. This series of references uses curvature compensation to obtain low temperature coefficient and trimmed thin-film resistors to achieve high output accuracy. These references can source up to 10mA and sink up to 2mA, making them ideal for precision regulator applications. They are stable without an output bypass capacitor, but are also stable with capacitance up to 1µF. This feature is important in critical applications where PC board space is a premium and fast settling is demanded. The LTC1798 series references provided power dissipa- tion advantages over shunt references. In addition to supply current, shunt references must also idle the entire load current to operate. The LTC1798 series is available in the SO-8 package.
The LTC ®1483 is an ultra-low power differential line trans- ceiver designed for data transmission standard RS485 applications with extended common-mode range (–7V to 12V). It will also meet the requirements of RS422. The LTC1483 features output drivers with controlled slew rate, decreasing the EMI radiated from the RS485 lines, and improving signal fidelity with misterminated lines. The CMOS design offers significant power savings over its bipolar counterparts without sacrificing ruggedness against overload or ESD damage. Typical quiescent current is only 80µA while operating and less than 1µA in shutdown. The driver and receiver feature three-state outputs, with the driver outputs maintaining high impedance over the entire common-mode range. Excessive power dissipation caused by bus contention or faults is prevented by a thermal shutdown circuit which forces the driver outputs into a high impedance state. The receiver has a fail-safe feature which guarantees a high output state when the inputs are left open. I/O pins are protected against multiple ESD strikes of over ±10kV. The LTC1483 is fully specified over the commercial and extended industrial temperature range and is available in 8-pin DIP and SO packages.
The LTC1562 is a low noise, low distortion continuous-time filter with ±5V single supply or ±5V/±10V dual supply, 10kHz to 150kHz center frequency, 4 independent 2nd order filter blocks, resistor-programmable center frequency, Q and gain.
AN131-1 is an application note that introduces the working principle of acoustic thermometer. This thermometer is insensitive to pressure and humidity, so only temperature needs to be measured.
This document describes the stable temperature performance of the LTC5582 and LTC5583 series RMS detectors, and how to improve measurement accuracy through temperature compensation. These RMS detectors maintain stable performance in a temperature range of -40°C to 85°C, at frequencies up to 10GHz (LTC5582) or 6GHz (LTC5583). By using two external resistors for temperature compensation, the measurement error can be reduced to less than 0.5dB.
This application note describes Linear Technology’s 2-Wire Virtual Remote Sensing technology for voltage regulators. The technology eliminates the line-drop effect on the source output voltage and does not require additional sense wires.
New components have made 18-bit DACs a practical design alternative. This application note describes a measurement technique for 18-bit DAC settling time, which is the time required for the DAC output to settle to within 4ppm of the command code.
This application note describes how to use the LTM2881 to build a dedicated isolated 5V power supply with no external components, capable of delivering 1W of power.
Application Note 123 introduces the LTC6400 differential amplifier/ADC driver and provides design optimization recommendations for low distortion, low noise, gain and power options, input considerations, dynamic range and output networks, stability, and layout considerations.
This application note describes how to measure the noise performance of voltage references. The note provides detailed schematics and circuit diagrams of the measurement system and provides instructions on the noise testing method.
