Analog Devices

The LT1032 is a RS232 and RS423 line driver that operates over a ±5V to ±15V range on low supply current and can be shut down to zero supply current. Outputs are fully protected from externally applied voltages of ±30V by both current and thermal limiting. Since the output swings to within 200mV of the positive supply and 600mV of the negative supply, power supply needs are minimized.Also included is a strobe pin to force all outputs low independent of input or shutdown conditions. Further, slew rate can be adjusted with a resistor connected to the supply.A major advantage of the LT1032 is the high impedance output state when off or powered down.For applications requiring dual or triple RS232 driver/receiver devices, see the LT1180A (dual), LT1039A (triple) or the LT1130A data sheets.ApplicationsRS232Power Supply InverterMicropower InterfaceLevel Translator

The LT1033 negative adjustable regulator will deliver up to 3A output current over an output voltage range of –1.2V to –32V, with better line and load regulation and a maximum output voltage error of 1%.The LT1033 is easy to use and difficult to damage. Internal current and power limiting as well as true thermal limiting prevents device damage due to overloads or shorts, even if the regulator is not fastened to a heat sink.Maximum reliability is attained with advanced processing techniques combined with a 100% burn-in in the thermal limit mode. This assures that all device protection circuits are working and eliminates field failures experienced with other regulators that receive only standard electrical testing.ApplicationsAdjustable Power SuppliesSystem Power SuppliesPrecision Voltage/Current RegulatorsOn-Card Regulators

The LT1034 is a micropower, precision 1.2V/2.5 reference combined with a 7V auxiliary reference. The 1.2V/2.5V reference is a trimmed, thin-film, band-gap, voltage reference with 1% initial tolerance and guaranteed 20ppm/°C temperature drift. Operating on only 20µA, the LT1034 offers guaranteed drift, low temperature cycling hysteresis and good long-term stability. The low dynamic impedance makes the LT1034 easy to use from unregulated supplies. The 7V reference is a subsurface zener device for less demanding applications.The LT1034 reference can be used as a high performance upgrade of the LM385 or LT1004, where guaranteed temperature drift is desired.ApplicationsPortable MetersPrecision RegulatorsCalibrators

The LT1007/LT1037 series features the lowest noise performance available to date for monolithic operational amplifiers: 2.5nV/√Hzwideband noise (less than the noise of a 400Ω resistor), 1/f corner frequency of 2Hz and 60nV peak-to- peak 0.1Hz to 10Hz noise. Low noise is combined with outstanding precision and speed specifications: 10µV offset voltage, 0.2µV/°C drift, 130dB common mode and power supply rejection, and 60MHz gain bandwidth product on the decompensated LT1037, which is stable for closed-loop gains of 5 or greater.The voltage gain of the LT1007/LT1037 is an extremely high 20 million driving a 2kΩ load and 12 million driving a 600Ω load to ±10V.In the design, processing and testing of the device, particular attention has been paid to the optimization of the entire distribution of several key parameters. Consequently, the specifications of even the lowest cost grades (the LT1007C and the LT1037C) have been spectacularly improved compared to equivalent grades of competing amplifiers.The sine wave generator application shown below utilizes the low noise and low distortion characteristics of the LT1037.ApplicationsLow Noise Signal ProcessingMicrovolt Accuracy Threshold DetectionStrain Gauge AmplifiersDirect Coupled Audio Gain StagesSine Wave GeneratorsTape Head PreamplifiersMicrophone Preamplifiers

The LT1039A is a triple RS232 driver/receiver that includes shutdown. Each receiver will accept up to ±30V input and can drive either TTL or CMOS logic. The RS232 drivers accept TTL logic inputs and output RS232 voltage levels. The outputs are fully protected against overload and can be shorted to ground or up to ±30V without damage to the drivers. Additionally, when the system is shut down or power is off, the outputs are in a high impedance state allowing data line sharing. On-chip ESD protection eliminates the need for external protection devices. A bias pin allows one receiver to be kept on while the rest of the part is shut down.A bias pin allows one receiver to be kept on while the rest of the part is shut down.The LT1039A is also available in the 16-pin version, without shutdown or bias pin functions.For applications requiring operation from a single 5V supply, see the LT1180A/LT1181A and LT1130A data sheets.ApplicationsRS232 InterfaceTerminalsModems

The LT1054 is a monolithic, bipolar, switched-capacitor voltage converter and regulator. The LT1054 provides higher output current than previously available converters with significantly lower voltage losses. An adaptive switch driver scheme optimizes efficiency over a wide range of output currents. Total voltage loss at 100mA output current is typically 1.1V. This holds true over the full supply voltage range of 3.5V to 15V. Quiescent current is typically 2.5mA.The LT1054 also provides regulation, a feature not previously available in switched-capacitor voltage converters. By adding an external resistive divider a regulated output can be obtained. This output will be regulated against changes in both input voltage and output current. The LT1054 can also be shut down by grounding the feedback pin. Supply current in shutdown is less than 100µA.The internal oscillator of the LT1054 runs at a nominal frequency of 25kHz. The oscillator pin can be used to adjust the switching frequency or to externally synchronize the LT1054.The LT1054 is pin compatible with previous converters such the LTC1044/ICL7660.ApplicationsVoltage InverterVoltage RegulatorNegative Voltage DoublerPositive Voltage Doubler

The LT1055/LT1056 JFET input operational amplifiers combine precision specifications with high speed performance.For the first time, 16V/µs slew rate and 6.5MHz gain-bandwidth product are simultaneously achieved with offset voltage of typically 50µV, 1.2µV/°C drift, bias currents of 40pA at 70°C and 500pA at 125°C.The 150µV maximum offset voltage specification is the best available on any JFET input operational amplifier.The LT1055 and LT1056 are differentiated by their operating currents. The lower power dissipation LT1055 achieves lower bias and offset currents and offset voltage. The additional power dissipation of the LT1056 permits higher slew rate, bandwidth and faster settling time with a slight sacrifice in DC performance.The voltage-to-frequency converter shown below is one of the many applications which utilize both the precision and high speed of the LT1055/LT1056.For a JFET input op amp with 23V/µs guaranteed slew rate, refer to the LT1022 data sheet.ApplicationsPrecision, High Speed InstrumentationLogarithmic AmplifiersD/A Output AmplifiersPhotodiode AmplifiersVoltage-to-Frequency ConvertersFrequency-to-Voltage ConvertersFast, Precision Sample-and-Hold