Analog Devices

The LTC6605-14 contains two independent, fully differential amplifiers configured as matched 2nd order 14MHz lowpass filters. The f–3dBof the filters is adjustable in the range of 12.4MHz to 20MHz and 25MHz.The internal op amps are fully differential, feature very low noise and distortion, and are compatible with 16-bit dynamic range systems. The inputs can accept single ended or differential signals. An input pin is provided for each amplifier to set the common mode level of the differential outputs.Internal laser-trimmed resistors and capacitors determine a precise, very well matched (in gain and phase) 14MHz 2nd order filter response. A single optional external resistor per channel can tailor the frequency response for each amplifier.Three-state BIAS pins determine each amplifier’s power consumption, allowing a choice between shutdown, medium power or full power.The LTC6605-14 is available in a compact 6mm × 3mm 22-pin leadless DFN package and operates over a –40°C to 85°C temperature range.ApplicationsBroadband Wireless ADC Driver/FilterAntialiasing FilterSingle-Ended to Differential ConversionDAC Smoothing FilterZero-IF Direct Conversion Receivers

The LTC6652 family of precision, low drift, low noise references is fully specified over the temperature range of –40°C to 125°C. High order curvature compensation allows these references to achieve a low drift of less than 5ppm/°C with a predictable temperature characteristic and an output voltage accuracy of ±0.05%. The performance over temperature should appeal to automotive, high performance industrial and other high temperature applications.The LTC6652 voltage references can be powered from supply voltages up to 13.2V. They boast low noise, excellent load regulation, source and sink capability and exceptional line rejection, making them a superior choice for demanding precision applications. A shutdown mode allows power consumption to be reduced when the reference is not needed. The optional output capacitor can be left off when space constraints are critical.The LTC6652 references are offered in an 8-lead MSOP package and an 8-lead LS8 package. The LS8 is a 5mm × 5mm surface mount hermetic package that provides outstanding stability.ApplicationsAutomotive Control and MonitoringHigh Temperature IndustrialHigh Resolution Data Acquisition SystemsInstrumentation and Process ControlPrecision RegulatorsMedical Equipment

The LTC6655 is a complete family of precision bandgap voltage references, offering exceptional noise and drift performance. This low noise and drift is ideally suited for the high resolution measurements required by instrumentation and test equipment. In addition, the LTC6655 is fully specified over the temperature range of –40°C to 125°C, ensuring its suitability for demanding automotive and industrial applications. Advanced curvature compensation allows this bandgap reference to achieve a drift of less than 2ppm/°C with a predictable temperature characteristic and an output voltage accurate to ±0.025%, reducing or eliminating the need for calibration.The LTC6655LN Low Noise comes with a noise reduction pin that enables reduction of wideband noise with the addition of a single capacitor.The LTC6655 can be powered from as little as 500mV above the output voltage to as much as 13.2V. Superior load regulation with source and sink capability, coupled with exceptional line rejection, ensures consistent performance over a wide range of operating conditions. A shutdown mode is provided for low power applications.The LTC6655 references are offered in an 8-lead MSOP package and an 8-lead LS8 package. The LS8 is a 5mm × 5mm surface mount hermetic package that provides outstanding stability.APPLICATIONSInstrumentation and Test EquipmentHigh Resolution Data Acquisition SystemsWeigh ScalesPrecision Battery MonitorsPrecision RegulatorsMedical Equipment

The LTC6702 is an extremely small dual comparator designed to maximize battery life while providing both speed and low voltage operation in applications where board space is a premium.These comparators operate on supplies between 1.7V and 5.5V, and have a maximum guaranteed propagation delay of 500ns while drawing only 30µA maximum quiescent current. Internal hysteresis desensitizes the LTC6702 to input noise and makes it easy to use, even with slow moving signals. CMOS inputs allow the use of large source impedances.The LTC6702 is available in the 8-pin SOT-23 and the tiny 2mm × 2mm DFN package.ApplicationsBattery Powered SystemsWindow ComparatorsThreshold Detectors/DiscriminatorsClock RegenerationAutomotive Sensing and Controls

The LTC6752 is a family of very high speed comparators capable of supporting toggle rates up to 280MHz. These comparators exhibit low propagation delays of 2.9ns, and fast rise/fall times of 1.2ns. There are a total of 5 members in the LTC6752 family, with different options for separate input and output supplies, shutdown, output latch, adjustable hysteresis, complementary outputs, and package.The LTC6752 comparators have rail-to-rail inputs that operate from 2.45V, up to 3.5V or 5.25V, depending on the option. The outputs are CMOS and the separate supply options can operate down to 1.71V, allowing for directly interfacing to 1.8V logic devices.The low propagation delay of only 2.9ns combined with low dispersion of only 1.8ns (10mV to 125mV overdrive variation) makes these comparators an excellent choice for critical timing applications. Similarly, the fast toggle rate and the low jitter of 4.5ps RMS (100mVP-P, 100MHz input) make the LTC6752 family ideally suited for high frequency line driver and clock recovery circuits.ApplicationsClock and Data RecoveryLevel ShiftingHigh Speed Data Acquisition SystemsWindow ComparatorsHigh Speed Line ReceiversFast Crystal OscillatorsTime of Flight MeasurementsTime Domain Reflectometry

The LTC6754 is a high speed rail-to-rail comparator with LVDS compatible outputs. The LTC6754 exhibits 1.8ns of propagation delay, only 1ns of dispersion (10mV to 125mV overdrive) and a toggle rate up to 890Mbps.The LTC6754 has rail-to-rail inputs, and will operate from a 2.4V to 5.25V supply. For the QFN package, the LVDS output is operated with a separate supply, providing isolation between input and output circuitry, and allowing for logic level translation.In shutdown mode, power is reduced from 13.4mA to under 1.1mA, and the comparator can wake up in 120ns.The LTC6754 includes 4.5mV of hysteresis to minimize instability. For the QFN package, a separate pin is available to set the hysteresis from 0mV (off) up to 40mV. The QFN version also features output latching to provide the ability to quickly capture the state of the comparator.The dispersion of only 1ns combined with excellent propagation delay of 1.8ns makes the device an excellent choice for timing critical applications. Similarly, the 890Mbps toggle rate and low jitter of 1.5psRMS(200mVP–P, 245.76MHz input) make the LTC6754 ideally suited for high frequency line driver and clock recovery circuits.ApplicationsClock and Data RecoveryLevel TranslationHigh Speed Data Acquisition SystemsWindow ComparatorsHigh Speed Line ReceiversTime Domain ReflectometryTime of Flight MeasurementsCable Drivers

The LTC6800 is a precision instrumentation amplifier. The CMRR is typically 116dB with a single 5V supply and is independent of gain. The input offset voltage is guaranteed below 100μV with a temperature drift of less than 250nV/°C. The LTC6800 is easy to use; the gain is adjustable with two external resistors, like a traditional op amp.The LTC6800 uses charge balanced sampled data techniques to convert a differential input voltage into a single ended signal that is in turn amplified by a zero-drift operational amplifier.The differential inputs operate from rail-to-rail and the single ended output swings from rail-to-rail. The LTC6800 is available in an MS8 surface mount package. For space limited applications, the LTC6800 is available in a 3mm × 3mm × 0.8mm dual fine pitch leadless package (DFN).ApplicationsThermocouple AmplifiersElectronic ScalesMedical InstrumentationStrain Gauge AmplifiersHigh Resolution Data Acquisition

The LTC6801 is a multicell battery monitoring IC incorporating a 12-bit ADC, a precision voltage reference, sampled comparator, and a high voltage input multiplexer. The LTC6801 can monitor as many as 12 series connected battery cells for overvoltage, undervoltage, and overtemperature conditions, indicating whether the cells are within specified parameters. The LTC6801 generates a clock output when no fault conditions exist. Differential clocking provides high noise immunity and ensures that battery stack fault conditions cannot be hidden by frozen bits or short circuit conditions.Each LTC6801 can operate with a battery stack voltage up to 60V and multiple LTC6801 devices can be stacked to monitor each individual cell in a long battery string. When multiple devices are stacked, the status signal of each LTC6801 can be daisy-chained, without opto-couplers or isolators, providing a single status output for the entire battery string.The LTC6801 is configurable by external pin strapping. Adjustable overvoltage and undervoltage thresholds support various Li-Ion chemistries. Selectable measurement times allow users to save power.ApplicationsRedundant Battery MonitorHybrid Electric VehiclesBattery Backup SystemsPower Systems Using Multiple Battery Cells

The LTC6802-1 is a complete battery monitoring IC that includes a 12-bit ADC, a precision voltage reference, a high voltage input multiplexer and a serial interface. Each LTC6802-1 can measure up to 12 series connected battery cells with an input common mode voltage up to 60V. In addition, multiple LTC6802-1 devices can be placed in series to monitor the voltage of each cell in a long battery string. The unique level-shifting serial interface allows the serial ports of these devices to be daisy-chained without optocouplers or isolators.When multiple LTC6802-1 devices are connected in series they can operate simultaneously, permitting all cell voltages in the stack to be measured within 13ms.To minimize power, the LTC6802-1 offers a measure mode, which simply monitors each cell for overvoltage and undervoltage conditions. A standby mode is also provided.Each cell input has an associated MOSFET switch for discharging overcharged cells.For large battery stack applications requiring individually addressable serial communications, see the LTC6802-2.SPI InterfaceFeaturesLTC6802-1Daisy ChainMultiple devices can be connected in serial fashion without digital isolationLTC6802-2AddressableParallel addressed SPI interface - each device in a chain communicates with a control processor in parallel via external digital isolatorsApplicationsElectric and Hybrid Electric VehiclesHigh Power Portable EquipmentBackup Battery SystemsHigh Voltage Data Acquisition Systems

The LTC6803 is a 2nd generation, complete battery monitoring IC that includes a 12-bit ADC, a precision voltage reference, a high voltage input multiplexer and a serial interface. Each LTC6803 can measure up to 12 series connected battery cells or supercapacitors. Many LTC6803 devices can be stacked to measure the voltage of each cell in a long battery string. Each LTC6803-2/LTC6803-4 has an individually addressable serial interface, allowing up to 16 LTC6803-2/LTC6803-4 devices to interface to one control processor and operate simultaneously. Each cell input has an associated MOSFET switch for discharging overcharged cells. The LTC6803-2 connects the bottom of the stack to V–internally. It is pin compatible with the LTC6802-2, providing a drop-in upgrade. The LTC6803-4 separates the bottom of the stack from V–, improving cell 1 measurement accuracy.The LTC6803 provides a standby mode to reduce supply current to 12μA. Furthermore, the LTC6803 can be powered from an isolated supply, providing a technique to reduce battery stack current draw to zero.The related LTC6803-1 and LTC6803-3 offer a serial interface that allows the serial ports of multiple LTC6803-1 or LTC6803-3 devices to be daisy chained without optocouplers or isolators.SPI InterfaceIsolated V–LTC6802 Pin CompatibleLTC6803-1Daisy ChainNoYesLTC6803-2AddressableNoYesLTC6803-3Daisy ChainYesNoLTC6803-4AddressableYesNoApplicationsElectric and Hybrid Electric VehiclesHigh Power Portable EquipmentBackup Battery SystemsElectric Bicycles, Motorcycles, Scooters