Analog Devices

The high impedance analog inputs and the ability to operate with reduced spans (below 1V full scale) allow direct connection to sensors and transducers in many applications, eliminating the need for gain stages.An efficient serial port communicates without external hardware to most MPU serial ports and all MPU parallel I/O ports allowing eight channels of data to be transmitted over as few as three wires. This, coupled with low power consumption, makes remote location possible and facilitates transmitting data through isolation barriers.Temperature drift of offset, linearity and full-scale error are all extremely low (1ppm/°C typically) allowing all grades to be specified with offset and linearity errors of ±0.5LSB maximum over temperature. In addition, the A grade devices are specified with full-scale error and total unadjusted error (including the effects of offset, linearity and full-scale errors) of ±1LSB maximum over temperature. The lower grade has a full-scale specification of ±2LSB for applications where full scale is adjustable or less critical.

The high impedance analog inputs and the ability to operate with reduced spans (below 1V full scale) allow direct connection to sensors and transducers in many applications, eliminating the need for gain stages.An efficient serial port communicates without external hardware to most MPU serial ports and all MPU parallel I/O ports allowing eight channels of data to be transmitted over as few as three wires. This, coupled with low power consumption, makes remote location possible and facilitates transmitting data through isolation barriers.Temperature drift of offset, linearity and full-scale error are all extremely low (1ppm/°C typically) allowing all grades to be specified with offset and linearity errors of ±0.5LSB maximum over temperature. In addition, the A grade devices are specified with full-scale error and total unadjusted error (including the effects of offset, linearity and full-scale errors) of ±1LSB maximum over temperature. The lower grade has a full-scale specification of ±2LSB for applications where full scale is adjustable or less critical.

The LTC1096/LTC1096L/LTC1098/LTC1098L are micropower, 8-bit A/D converters that draw only 80μA of supply current when converting. They automatically power down to 1nA typical supply current whenever they are not performing conversions. They are packaged in 8-pin SO packages and have both 3V (L) and 5V versions. These 8-bit, switched-capacitor, successive approximation ADCs include sample-and-hold. The LTC1096/LTC1096L have a single differential analog input. The LTC1098/LTC1098L offer a software selectable 2-channel MUX.On-chip serial ports allow efficient data transfer to a wide range of microprocessors and microcontrollers over three wires. This, coupled with micropower consumption, makes remote location possible and facilitates transmitting data through isolation barriers.These circuits can be used in ratiometric applications or with an external reference. The high impedance analog inputs and the ability to operate with reduced spans (below 1V full scale) allow direct connection to sensors and transducers in many applications, eliminating the need for gain stages.ApplicationsBattery-Operated SystemsRemote Data AcquisitionBattery MonitoringBattery Gas GaugesTemperature MeasurementIsolated Data Acquisition

The LTC1096/LTC1096L/LTC1098/LTC1098L are micropower, 8-bit A/D converters that draw only 80μA of supply current when converting. They automatically power down to 1nA typical supply current whenever they are not performing conversions. They are packaged in 8-pin SO packages and have both 3V (L) and 5V versions. These 8-bit, switched-capacitor, successive approximation ADCs include sample-and-hold. The LTC1096/LTC1096L have a single differential analog input. The LTC1098/LTC1098L offer a software selectable 2-channel MUX.On-chip serial ports allow efficient data transfer to a wide range of microprocessors and microcontrollers over three wires. This, coupled with micropower consumption, makes remote location possible and facilitates transmitting data through isolation barriers.These circuits can be used in ratiometric applications or with an external reference. The high impedance analog inputs and the ability to operate with reduced spans (below 1V full scale) allow direct connection to sensors and transducers in many applications, eliminating the need for gain stages.ApplicationsBattery-Operated SystemsRemote Data AcquisitionBattery MonitoringBattery Gas GaugesTemperature MeasurementIsolated Data Acquisition

The LTC1099 is a high speed microprocessor compatible 8-bit analog-to-digital converter (A/D). An internal sample-and-hold (S/H) allows the A/D to convert inputs up to the full Nyquist limit. With a conversion rate of 2.5µs, this allows 156kHz 5VP-Pinput signals or slew rates as high as 2.5V/µs, to be digitized without the need for an external S/H.Two modes of operation, READ (RD) mode and WRITE-READ (WR-RD) mode, allows easy interface with processors. All timing is internal and edge sensitive which eliminates the need for external pulse shaping circuits. The Stand-Alone (S/A) mode is convenient for those applications not involving a processor.Data outputs are latched with three-state control to allow easy interface to a processor data bus or I/O port. An overflow output (OFL) is provided to allow cascading for higher resolution.ApplicationsResolution: 8 BitsConversion Time:2.5µs (RD Mode)2.5µs (WR-RD Mode)Slew Rate Limit (Internal S/H): 2.5V/µsLow Power: 75mW MaxTotal Unadjusted ErrorLTC1099: ±1LSBLTC1099A: ±1/2LSB

The LTC1142/LTC1142L/LTC1142HV are dual synchronous step-down switching regulator controllers featuring automatic Burst Mode™operation to maintain high efficiencies at low output currents. The devices are composed of two separate regulator blocks, each driving a pair of external complementary power MOSFETs, at switching frequencies up to 250kHz, using a constant off-time current mode architecture providing constant ripple current in the inductor.The operating current level for both regulators is user programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 18V (20V maximum). Constant off-time architecture provides low dropout regulation limited only by the RDS(ON)of the external MOSFET and resistance of the inductor and current sense resistor.The LTC1142 series is ideal for applications requiring dual output voltages with high conversion efficiencies over a wide load current range in a small amount of board space.ApplicationsNotebook and Palmtop ComputersBattery-Operated Digital DevicesPortable InstrumentsDC Power Distribution Systems

The LTC1143 series is a dual step-down switching regulator controller featuring automatic Burst Mode™operation to maintain high efficiencies at low output currents. This device is composed of two separate regulator blocks, each driving an external power MOSFET at switching frequencies up to 400kHz using a constant off-time current mode architecture. Both fixed and adjustable voltages are available.The operating current level for both regulators is user-programmable via an external current sense resistor. Wide input supply range allows operation from 4V to 14V (16V maximum). The LTC1143L and LTC1143L-ADJ extend operation to VIN= 3.5V. 100% duty cycle provides low dropout regulation limited only by the RDS(ON)of the external MOSFET and resistance of the inductor and current sense resistor.The LTC1143 series is ideal for applications requiring dual output voltages with high conversion efficiencies over a wide load current range in a small amount of board space.ApplicationsPersonal Digital AssistantsNotebook and Palmtop ComputersBattery-Operated Digital DevicesPortable InstrumentsDC Power Distribution Systems

The LTC1144 is a monolithic CMOS switched-capacitor voltage converter. It performs supply voltage conversion from positive to negative from an input range of 2V to 18V, resulting in complementary output voltages of –2V to –18V. Only two noncritical external capacitors are needed for the charge pump and charge reservoir functions.The converter has an internal oscillator that can be overdriven by an external clock or slowed down when connected to a capacitor. The oscillator runs at a 10kHz frequency when unloaded. A higher frequency outside the audio band can also be obtained if the Boost Pin is tied to V+. TheSHDNpin reduces supply current to 8μA and can be used to save power when the converter is not in use.The LTC1144 contains an internal oscillator, divide-by-two, voltage level shifter, and four power MOSFETs. A special logic circuit will prevent the power N-channel switch substrate from turning on.ApplicationsConversion of 15V to ±15V SuppliesInexpensive Negative SuppliesData Acquisition SystemsHigh Voltage Upgrade to LTC1044 or 7660Voltage Division and MultiplicationsAutomotive ApplicationsBattery Systems with Wall Adapter/Charger

The LTC1147 series are step-down switching regulator controllers featuring automatic BurstMode™operation to maintain high efficiencies at low output currents. These devices drive an external P-channel power MOSFET at switching frequencies exceeding 400kHz using a constant off-time current mode architecture providing constant ripple current in the inductor.The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 14V (16V maximum). Constant off-time architecture provides low dropout regulation limited by only the RDS(ON)of the external MOSFET and resistance of the inductor and current sense resistor.The LTC1147 series incorporates automatic power saving Burst Mode operation to reduce switching losses when load currents drop below the level required for continuous operation. Standby power is reduced to only 2mW at VIN= 10V (at IOUT= 0). Load currents in Burst Mode operation are typically 0mA to 300mA.For applications where even higher efficiency is required, refer to the LTC1148 data sheet and Application Note 54.ApplicationsNotebook and Palmtop ComputersPortable InstrumentsBattery-Operated Digital DevicesCellular TelephonesDC Power Distribution SystemsGPS Systems