Analog Devices Inc./Maxim Integrated

The LT1112 dual and LT1114 quad op amps achieve a new standard in combining low cost and outstanding precision specifications.The performance of the selected prime grades matches or exceeds competitive devices. In the design of the LT1112/LT1114 however, particular emphasis has been placed on optimizing performance in the low cost plastic and SO packages. For example, the 75µV maximum offset voltage in these low cost packages is the lowest on any dual or quad non-chopper op amp.The LT1112/LT1114 also provide a full set of matching specifications, facilitating their use in such matching dependent applications as two and three op amp instrumentation amplifiers.Another set of specifications is furnished at ±1V supplies. This, combined with the low 320µA supply current per amplifier, allows the LT1112/LT1114 to be powered by two nearly discharged AA cells.ApplicationsPicoampere/Microvolt InstrumentationTwo and Three Op Amp Instrumentation AmplifersThermocouple and Bridge AmplifiersLow Frequency Active FiltersPhoto Current AmplifiersBattery-Powered Systems

The LT1113 achieves a new standard of excellence in noise performance for a dual JFET op amp. The 4.5nV/√Hz1kHz noise combined with low current noise and picoampere bias currents makes the LT1113 an ideal choice for amplifying low level signals from high impedance capacitive transducers.The LT1113 is unconditionally stable for gains of 1 or more, even with load capacitances up to 1000pF. Other key features are 0.4mV VOS and a voltage gain of 4 million. Each individual amplifier is 100% tested for voltage noise, slew rate and gain bandwidth.The design of the LT1113 has been optimized to achieve true precision performance with an industry standard pinout in the S0-8 package. A set of specifications are provided for ±5V supplies and a full set of matching specifications are provided to facilitate the use of the LT1113 in matching dependent applications such as instrumentation amplifier front ends.ApplicationsPhotocurrent AmplifiersHydrophone AmplifiersHigh Sensitivity Piezoelectric AccelerometersLow Voltage and Current Noise Instrumentation Amplifier Front EndsTwo and Three Op Amp Instrumentation AmplifiersActive Filters

The LT1116 is an ultra fast (12ns) comparator designed for sensing signals near the negative supply. The input common mode range extends from 2.5V below the positive supply down to the negative supply rail. Like the LT1016, this comparator is specifically designed to interface directly to TTL logic with complementary outputs. The comparator may operate from either a single 5V supply or dual ±5V supplies. Tight offset voltage specifications and high gain allow the LT1116 to be used in precision applications.The LT1116 is designed for improved speed and stability for a wide range of operating conditions. The output stage provides active drive in both directions for maximum speed into TTL logic or passive loads, yet it has minimal cross-conduction current. Unlike other fast comparators, the LT1116 remains stable even for slow transitions through the active region, which eliminates the need to specify a minimum input slew rate.The LT1116 has an internal, TTL compatible latch for retaining data at the outputs. The latch holds data as long as the latch pin is held high. Device parameters such as gain, offset, and negative power supply current are not significantly affected by variations in negative supply voltage.ApplicationsHigh Speed A/D ConvertersZero Crossing DetectorsCurrent Sense for Switching RegulatorsExtended Range V to F ConvertersFast Pulse Height/Width DiscriminatorsHigh Speed TriggersLine ReceiversHigh Speed Sampling Circuits

The LT1120A is a combination micropower positive regulator and free collector comparator on a single monolithic chip. With only 20µA supply current, the LT1120A can supply over 125mA of output current. Input voltage range is from 4.5V to 36V and dropout voltage is 0.6V at 125mA. Dropout voltage decreases with lower load currents.Also included on the chip is a class B output 2.5V reference that can either source or sink current. This allows it to be used as a supply splitter or auxiliary output. A shutdown pin allows logic shutdown of the output.The comparator can be used for system or battery monitoring. For example, the comparator can be used to warn of low system voltage. Frequency compensation of the comparator for amplifier applications can be obtained by adding external output capacitance.No Load Quiescent CurrentLT112080uALT1120A30uAApplicationsBattery SystemsBattery Backup SystemPortable TerminalsPortable InstrumentsMemory Keep Alive