The LTC3544 is a quad, high efficiency, monolithic synchronous buck regulator using a constant-frequency, current mode architecture. The four regulators operate independently with separate run pins. The 2.25V to 5.5V input voltage range makes the LTC3544 well suited for single Li-Ion/polymer battery-powered applications. 100% duty cycle provides low dropout operation, extending battery runtime in portable systems. Low ripple Burst Mode? operation increases efficiency at light loads, further extending battery runtime with typically only 20mV of ripple.Switching frequency is internally set to 2.25MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switches increase efficiency and eliminate the need for external Schottky diodes. Low output voltages are easily supported with the 0.8V feedback reference voltage.The LTC3544 is available in a low profile (0.75mm) (3mm ? 3mm) QFN package. Light Load Operation LTC3544 Burst Mode (20mVP-P),

DC1040A-B: Demo Board for the LTC3544B Quad Synchronous Step-Down Regulator, 2.25MHz, 300mA, 200mA, 200mA and 100mA.

Demonstration circuit 1046A is a non-isolated, high efficiency buck-boost DC/DC supply featuring LTC3780EG and LTC4440ES6. The LTC3780 is a high performance 4-switch synchronous buck boost regulator and the LTC4440 is a 100V-rated FET driver. The input voltage of the demo board is designed for 36V to 72V. The output voltage is 48V. At 25C° room temperature, the maximum output current is 5A without a cooling fan and 6A with 150LFM air flow for cooling. An optional 12V bias flyback supply using the LTC3803 is stuffed on the board to power the LTC3780 and LTC4440.

The LTC1068 product family consists of four monolithic clock-tunable filter building blocks. Each product contains four matched, low noise, high accuracy 2nd order switched-capacitor filter sections. An external clock tunes the center frequency of each 2nd order filter section. The LTC1068 products differ only in their clock-to-center frequency ratio. The clock-to-center frequency ratio is set to 200:1 (LTC1068-200), 100:1 (LTC1068), 50:1 (LTC1068-50) or 25:1 (LTC1068-25). External resistors can modify the clock-to-center frequency ratio. High performance, quad 2nd order, dual 4th order or 8th order filters can be designed with an LTC1068 family product. Designing filters with an LTC1068 product is fully supported by FilterCAD? filter design software for Windows. The LTC1068 products are available in a 28-pin SSOP surface mount package. A customized version of an LTC1068 family product can be obtained in a 16-lead SO package with internal thin-film resistors. Please contact LTC Marketing for details.Applications Lowpass or Highpass Filters: LTC1068-200, 0.5Hz to 25kHz; LTC1068, 1Hz to 50kHz; LTC1068-50, 2Hz to 50kHz; LTC1068-25, 4Hz to 200kHz Bandpass or Bandreject (Notch) Filters: LTC1068-200, 0.5Hz to 15kHz; LTC1068, 1Hz to 30kHz; LTC1068-50, 2Hz to 30kHz; LTC1068-25, 4Hz to 140kHz

The LTC4218 is a Hot Swap?controller that allows a board to be safely inserted and removed from a live backplane. An internal high side switch driver controls the gate of an external N-channel MOSFET for supply voltages from 2.9V to 26.5V. A dedicated 12V version (LTC4218-12) contains preset 12V specific thresholds, while the standard LTC4218 allows adjustable thresholds.The LTC4218 provides an accurate (5%) current limit with current foldback limiting. The current limit threshold can be adjusted dynamically using an external pin. Additional features include a current monitor output that amplifies the sense voltage for ground referenced current sensing. Overvoltage, undervoltage and power good monitoring are also provided.Applications RAID Systems ATCA, AMC, ?TCA Systems Server I/O Cards Industrial

Demonstration circuits 1053A-E through 1053A-H exercise the LTC3526L family of high efficiency synchronous boost converters, and are capable of operating with an input voltage range from 0.8V to 5.5V. The 2 × 2 mm DFN thermally enhanced package, high switching frequency (1MHz or 2MHz) and 550mA internal power switches provide a very tiny solution. The LTC3526L family also features output disconnect, and the input voltage can be greater or less than the output voltage. DC1053A-E features the LTC3526L (Burst mode operation) and the DC1053A-F features the LTC3526LB (Burst mode defeated). Both have a 1MHz switching frequency and use a 4.7µH inductor.

DC1058A-F: Demo Board for the LTC2203 16-Bit, 25Msps ADCs and LTC6403-1 200MHz, Low Noise, Low Power Fully Differential Input/Output Amplifier/Driver.

DC1068A: Demo Board for the LTC3550 Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter.

Demonstration Circuit 1073 is a 100kHz-500kHz programmable frequency, high voltage, current-mode DC/DC step-down converter featuring the LT3845. The operating frequency can be synchronized up to 600kHz. The demo board is designed for 12V @ 6.25A (75W) output from a 20V to 55V input. A soft-start feature controls the output voltage slew rate at start-up, reducing current surges and voltage overshoots. The modes of operation (Burst Mode, Discontinuous Current Mode and Continuous Current Mode) are jumper selectable. Both Burst Mode and Discontinuous Current Mode increase the efficiency at light loads. Continuous Current Mode will maintain a constant switching frequency regardless of the load current.

The LTC2630 is a family of 12-, 10-, and 8-bit voltage output DACs with an integrated, high-accuracy, low-drift reference in a 6-lead SC70 package. It has a rail-to-rail output buffer and is guaranteed monotonic.The LTC2630-L has a full-scale output of 2.5V, and operates from a single 2.7V to 5.5V supply. The LTC2630-H has a full-scale output of 4.096V, and operates from a 4.5V to 5.5V supply. Each DAC can also operate in supply as reference mode, which sets the full-scale output to the supply voltage.The parts use a simple SPI/MICROWIRE? compatible 3-wire serial interface which operates at clock rates up to 50MHz.The LTC2630 incorporates a power-on reset circuit. Options are available for reset to zero or reset to midscale after power-up.Applications Mobile Communications Process Control and Industrial Automation Automatic Test Equipment Portable Equipment Automotive

The AD9780 / AD9781 / AD9783 include pin-compatible, high dynamic range, dual digital-to-analog converters (DACs) with 12-/14-/16-bit resolutions, and sample rates of up to 500 MSPS. The devices include specific features for direct conversion transmit applications, including gain and offset compensation, and they interface seamlessly with analog quadrature modulators such as the?ADL5370.A proprietary, dynamic output architecture permits synthesis of analog outputs even above Nyquist by shifting energy away from the fundamental and into the image frequency.Full programmability is provided through a serial peripheral interface (SPI) port. Some pin-programmable features are also offered for those applications without a controller.PRODUCT HIGHLIGHTS Low noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals. Proprietary switching output for enhanced dynamic performance. Programmable current outputs and dual auxiliary DACs provide flexibility and system enhancements.APPLICATIONS Wireless infrastructure W-CDMA, CDMA2000, TD-SCDMA, WiMAX Wideband communications LMDS/MMDS, point-to-point RF signal generators, arbitrary waveform generators

The AD9785/AD9787/AD9788 are 12-bit, 14-bit, and 16-bit,high dynamic range TxDAC? devices, respectively, that providea sample rate of 800 MSPS, permitting multicarrier generationup to the Nyquist frequency. Features are included for optimizingdirect conversion transmit applications, including complexdigital modulation, as well as gain, phase, and offset compensation.The DAC outputs are optimized to interface seamlesslywith analog quadrature modulators, such as the ADL5375family from Analog Devices, Inc. A serial peripheral interface(SPI) provides for programming and readback of many internalparameters. Full-scale output current can be programmed overa range of 10 mA to 30 mA. The AD9785/AD9787/AD9788family is manufactured on a 0.18 ?m CMOS process and operatesfrom 1.8 V and 3.3 V supplies. It is enclosed in a 100-lead TQFPpackage.Product Highlights Low noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies. Proprietary DAC output switching technique enhances dynamic performance. CMOS data input interface with adjustable setup and hold. Low power complex 32-bit numerically controlled oscillators (NCOs).Applications Wireless infrastructure W-CDMA, CDMA2000, TD-SCDMA, WiMAX, GSM Digital high or low IF synthesis Transmit diversity Wideband communications LMDS/MMDS, point-to-point

The AD9864 is a general-purpose IF subsystem that digitizes alow level, 10 MHz to 300 MHz IF input with a signal bandwidthranging from 6.8 kHz to 270 kHz. The signal chain of the AD9864consists of a low noise amplifier (LNA), a mixer, a band-pass ?-?analog-to-digital converter (ADC), and a decimation filter withprogrammable decimation factor. An automatic gain control(AGC) circuit gives the AD9864 12 dB of continuous gainadjustment. Auxiliary blocks include both clock and localoscillator (LO) synthesizers.The high dynamic range of the AD9864 and inherent antialiasingprovided by the band-pass ?-? converter allow the device to copewith blocking signals up to 95 dB stronger than the desired signal.This attribute often reduces the cost of a radio by reducing IFfiltering requirements. Also, it enables multimode radios of varyingchannel bandwidths, allowing the IF filter to be specified for thelargest channel bandwidth.The SPI port programs numerous parameters of the AD9864,allowing the device to be optimized for any given application.Programmable parameters include synthesizer divide ratios, AGCattenuation and attack/decay time, received signal strength level,decimation factor, output data format, 16 dB attenuator, and theselected bias currents.The AD9864 is available in a 48-lead LFCSP package and operatesfrom a single 2.7 V to 3.6 V supply. The total power consumptionis typically 56 mW and a power-down mode is provided viaserial interfacing.APPLICATIONS Multimode narrow-band radio products Analog/digital UHF/VHF FDMA receivers TETRA, APCO25, GSM/EDGE Portable and mobile radio products SATCOM terminals

The AD9911 is a complete direct digital synthesizer (DDS).This device includes a high speed DAC with excellent widebandand narrowband spurious-free dynamic range (SFDR) as well asthree auxiliary DDS cores without assigned digital-to-analogconverters (DACs). These auxiliary channels are used for spurreduction, multitone generation, or test-tone modulation.The AD9911 is the first DDS to incorporate SpurKillertechnology and multitone generation capability. Multitonemode enables the generation up to four concurrent carriers;frequency, phase and amplitude can be independentlyprogrammed. Multitone generation can be used for systemtests, such as inter-modulation distortion and receiver blockersensitivity. SpurKilling enables customers to improve SFDRperformance by reducing the magnitude of harmoniccomponents and/or the aliases of those harmonic components.Test-tone modulation efficiently enables sine wave modulationof amplitude on the output signal using one of the auxiliaryDDS cores.The AD9911 can perform modulation of frequency, phase, oramplitude (FSK, PSK, ASK). Modulation is implemented bystoring profiles in the register bank and applying data to theprofile pins. In addition, the AD9911 supports linear sweep offrequency, phase, or amplitude for applications such as radarand instrumentation.The DDS acts as a high resolution frequency divider with theREF_CLK as the input and the DAC providing the output. TheREF_CLK input can be driven directly or used in combinationwith an integrated REF_CLK multiplier (PLL). The REF_CLKinput also features an oscillator circuit to support an externalcrystal as the REF_CLK source. The crystal can be used incombination with the REF_CLK multiplier.The AD9911 I/O port offers multiple configurations to providesignificant flexibility. The I/O port offers an SPI-compatiblemode of operation that is virtually identical to the SPI operationfound in earlier Analog Devices DDS products.Flexibility is provided by four data pins (Pin SDIO_0,Pin SDIO_1, Pin SDIO_2, and Pin SDIO_3) that allow fourprogrammable modes of I/O operation.The DAC output is supply referenced and must be terminatedinto AVDD by a resistor and an AVDD center-tapped transformer.The DAC has its own programmable reference to enabledifferent full-scale currents.The DDS core (the AVDD pins and the DVDD pins) is poweredby a 1.8 V supply. The digital I/O interface (SPI) operates at3.3 V and requires that the Pin DVDD_I/O (Pin 49) beconnected to 3.3 V. Applications Agile local oscillator Test and measurement equipment Commercial and amateur radio exciter Radar and sonar Test-tone generation Fast frequency hopping Clock generation

The AD9956 is Analog Devices?s first AgileRF synthesizer.The device is comprised of a DDS and PLL circuitry. The DDSfeatures a 14-bit DAC operating up to 400 MSPS and a 48-bitfrequency tuning word. The PLL Circuitry includes a phasedetector with scaleable 200 MHz inputs (pre-scalar inputsoperate up to 650 MHz) and digital control over the chargepump current. The device also includes a 650 MHz PECL driverwith programmable slew rates.The AD9956 uses advanced DDStechnology, an internal high-speed, high performance D/Aconverter and an advance phase-detector/charge pumpcombination to enable the synthesis of digitally-programmable,frequency-agile analog output sinusoidal waveforms up to2.7 GHz. The AD9956 is designed to provide fast frequencyhopping and fine tuning resolution (48-bit frequency tuningword). Information is loaded into the AD9956 via a serial I/Oport which has a device write speed of 25 MBit/sec. The AD9956DDS block also supports a user defined linear sweep mode ofoperation.The AD9956 is specified to operate over the extendedautomotive range of ?40?C to +125?C.Applications Agile LO frequency synthesis FM chirp source for radar and scanning systems Automotive radars Test and measurement equipment Acousto-optic device drivers

The AD9957 functions as a universal I/Q modulator and agileupconverter for communications systems where cost, size, powerconsumption, and dynamic performance are critical. TheAD9957 integrates a high speed, direct digital synthesizer(DDS), a high performance, high speed, 14-bit digital-to-analogconverter (DAC), clock multiplier circuitry, digital filters, andother DSP functions onto a single chip. It provides basebandupconversion for data transmission in a wired or wirelesscommunications system.The AD9957 is the third offering in a family of quadraturedigital upconverters (QDUCs) that includes the AD9857 andAD9856. It offers performance gains in operating speed, powerconsumption, and spectral performance. Unlike its predecessors,it supports a 16-bit serial input mode for I/Q baseband data.The device can alternatively be programmed to operate either asa single tone, sinusoidal source or as an interpolating DAC.The reference clock input circuitry includes a crystal oscillator,a high speed, divide-by-two input, and a low noise PLL formultiplication of the reference clock frequency.The user interface to the control functions includes a serial porteasily configured to interface to the SPORT of the Blackfin?DSP and profile pins to enable fast and easy shift keying of anysignal parameter (phase, frequency, or amplitude).Applications HFC data, telephony, and video modems Wireless base station transmissions Broadband communications transmissions Internet telephony

The AD9961/AD9963 are pin-compatible, 10-/12-bit, lowpower MxFE? converters that provide two ADC channels withsample rates of 100 MSPS and two DAC channels with samplerates to 170 MSPS. These converters are optimized for transmit and receive signal paths of communication systems requiring lowpower and low cost. The digital interfaces provide flexibleclocking options. The transmit is configurable for 1?, 2?, 4?, and 8? interpolation. The receive path has a bypassable 2? decimating low-pass filter.The AD9961 and AD9963 have five auxiliary analog channels.Three are inputs to a 12-bit ADC. Two of these inputs can beconfigured as outputs by enabling 10-bit DACs. The other two channels are dedicated outputs from two independent 12-bit DACs.The high level of integrated functionality, small size, and lowpower dissipation of the AD9961/AD9963 make them well-suited for portable and low power applications.APPLICATIONS Wireless infrastructure Picocell, femtocell basestations Medical instrumentation Ultrasound AFE Portable instrumentation Signal generators, signal analyzers

The ADA2200 is a synchronous demodulator and configurable analog filter designed to perform precision magnitude and phase measurements in low power, sensor signal conditioning and data acquisition applications for the industrial, medical, and communications markets. Implemented with ADI?s patent pending sampled analog technology (SAT), the ADA2200 is an analog input, sampled analog output device that includes an analog domain, low-pass 1/8x decimation finite impulse response (FIR) filter, a configurable infinite impulse response (IIR) filter, mixer with 0?/90? phase selection, reference clock and ADC driver output. Utilizing sampled analog technology, the signal processing is performed entirely in the analog domain by charge sharing among capacitors, which eliminates the effects of quantization noise and rounding errors and reduces downstream ADC sample rates while also offloading computationally heavy tasks from the digital processor or micro-controller.The ADA2200 acts as a precision filter when the demodulation function is disabled. The filter has a programmable bandwidth and tunable center frequency. The filter characteristics are highly stable over temperature, supply, and process variation.Single-ended and differential signal interfaces are possible on both input and output terminals, simplifying the connection to other components of the signal chain. The low power consumption and rail-to-rail operation is ideal for battery-powered and low voltage systems.The ADA2200 can be programmed over its SPI-compatible serial port or can automatically boot from the EEPROM through its I2C interface. On-chip clock generation produces a mixing signal with a programmable frequency and phase. In addition, the ADA2200 synchronization output signal eases interfacing to other sampled systems, such as data converters and multiplexers.The ADA2200 is available in a 16-lead TSSOP package. Its performance is specified over the industrial temperature range of ?40?C to +85?C. Note that throughout this data sheet, multifunction pins, such as SCLK/SCL, are referred to either by the entire pin name or by a single function of the pin, for example, SCLK, when only that function is relevant.Applications Synchronous demodulation Sensor signal conditioning Lock-in amplifiers Phase detectors Precision tunable Filters Signal recovery Control systems

The ADA4254 is a zero drift, high voltage, low power?programmable gain instrumentation amplifier (PGIA) designed?for process control and industrial applications. The ADA4254?features 12 binary weighted gains ranging from 1/16 V/V to?128 V/V and three scaling gain options of 1 V/V, 1.25 V/V, and?1.375 V/V, resulting in 36 possible gain settings. The power?consumption of the ADA4254 is a mere 22 mW, making the?device an excellent choice for industrial systems that demand?precision, robustness, and low power.The zero drift amplifier topology of the ADA4254 self calibrates dc errors and low frequency 1/f noise, achieving excellent dc precision over the entire specified temperature range. This high level of precision maximizes dynamic range and greatly reduces calibration requirements in many applications.?The input multiplexer provides ?60 V protection to the high impedance inputs of the amplifier, while providing the capability to switch between two input sources. In addition, integrated electromagnetic interference (EMI) filters block harsh RF noise from the sensitive inputs of the amplifier.?Various safety features on the ADA4254 detect both internal and external faults. The serial port interface (SPI) supports cyclical redundancy check (CRC) error detection to ensure robust communication. These safety features ease system safety integrity level (SIL) certification.?Seven general-purpose input/output (GPIO) pins, which can be configured to provide various special functions, are included in the ADA4254. An excitation current source output is available to bias sensors such as resistance temperature detectors (RTDs).?The ADA4254 is specified over the ?40?C to +105?C temperature range and is offered in a compact 5 mm ? 5 mm, 28-lead LFCSP and a 24-lead TSSOP.?Applications Universal process control front ends Data acquisition systems Test and measurement systems?

The ADA4255 is a precision programmable gain instrumentation amplifier (PGIA) with integrated bipolar charge pumps. With its integrated charge pumps, the ADA4255 internally produces the high voltage bipolar supplies needed to achieve a wide input voltage range (38 V typical with VDDCP = 5 V) without lowering input impedance. The charge pump topology of the ADA4255 allows channels to be isolated with only low voltage components, reducing complexity, size, and implementation time in industrial and process control systems.The zero drift PGIA topology of the ADA4255 self calibrates dc errors and lower frequency 1/f noise, achieving excellent dc precision over the entire specified temperature range. The combination of 36 precision gains ranging from 1/16 V/V to 176 V/V within the ADA4255 and high voltage, high impedance inputs allow a wide range of inputs to be scaled to the range of the analog-to-digital converter (ADC). By integrating all gain setting and level shifting resistors, the ADA4255 achieves excellent common-mode rejection ratio (CMRR) performance (111 dB minimum at G = 1 V/V) and extremely low gain drift (?1 ppm/?C maximum). This high level of precision maximizes dynamic range and greatly reduces calibration requirements in many applications.The ?60 V input protection, integrated electromagnetic interference (EMI) filtering and various safety features make the ADA4255 an ideal choice for robust industrial systems. Seven general-purpose input and output (GPIOx) pins, which can be configured to provide various special functions, are included in the ADA4255. An excitation current source output is available to bias sensors such as resistance temperature detectors (RTDs).The ADA4255 is specified over the ?40?C to +105?C temperature range and is offered in a compact 5 mm ? 5 mm, 28-lead LFCSP.APPLICATIONSUniversal process control front endsData acquisition systemsTest and measurement systemsSystem power monitoring