Analog Devices

The LTC1564 is a new type of continuous time filter for antialiasing, reconstruction and other band-limiting applications. No other analog components or filter expertise are needed to use it. There is one analog input pin and one analog output pin. The cutoff frequency (fC) and gain are programmable while the shape of the lowpass response is fixed. A latching digital interface stores fCand gain settings or it can be bypassed for control directly from the pins. The LTC1564 operates from 2.7V to 10V total (single or split supplies) and comes in a 16-pin surface mount SSOP.The LTC1564 is a rail-to-rail high resolution 8th-order lowpass filter with two stopband notches, giving approximately 100dB attenuation at 2.5 times the passband cutoff frequency fC(a de-facto standard for DSP front ends). Signals with low or variable levels can be normalized with the built-in variable gain that reduces input-referred noise with increasing gain for a typical dynamic range (maximum signal level to minimum noise) of 122dB (20 equivalent bits) with 20kHz fCand 118dB at 100kHz fCon a ±5V supply.Other frequency-response shapes can be provided upon request. Please contact Analog Devices Marketing.ApplicationsAntialias or Reconstruction FilteringDSP SystemsCommunications SystemsScientific InstrumentsHigh Resolutions (16 Bits to 20 Bits)Processing Signals Buried in NoiseAudio Signal ProcessingProgrammable Data RatesAutomatic Gain Control (AGC)Single Part Replacing Multiple Filters

The LTC1565-31 is a 7th order, continuous time, linear phase lowpass filter. The selectivity of the LTC1565-31, combined with its linear phase and dynamic range, make it suitable for filtering in data communications or data acquisition systems. The filter attenuation is 36dB at 2× fCUTOFFand at least 72dB for frequencies above 3× fCUTOFF. Unlike comparable LC filters, the LTC1565-31 achieves this selectivity with a linear phase response in the passband.With 5% accuracy of the cutoff frequency, the LTC1565-31 can be used in applications requiring pairs of matched filters, such as transceiver I and Q channels. Furthermore, the differential inputs and outputs provide a simple interface for these wireless systems.With a single 5V supply and a 2VP-Pinput, the LTC1565-31 features an impressive spurious free dynamic range of 75dB. The maximum signal-to-noise ratio is 78dB and it is achieved with a 2.5VP-Pinput signal.The LTC1565-31 features a shutdown mode where power supply current is typically less than 10μA.For W-CDMA, 3G, CDMA 2000 and other cellular and noncellular cutoff frequencies or single-ended I/O, please contact Analog Devices Marketing for additional information.ApplicationsCDMA BasestationsData CommunicationsAntialiasing FiltersSmoothing or Reconstruction FiltersMatched Filter PairsReplacement for LC Filters

The LTC1566-1 is a 7th order continuous time lowpass filter with 12dB of passband gain. The selectivity, linearity and dynamic range makes the LTC1566-1 suitable for filtering in data communications or data acquisition systems. The filter attenuation is 40dB at 1.5 × fCUTOFFand at least 60dB for frequencies above 10MHz.The LTC1566-1 has an input referred noise of 62µVRMSin a 2MHz bandwidth. In receiver applications where the signal levels are small, the filter features 71dB of spurious free dynamic range.With 5% accuracy of the cutoff frequency, the LTC1566-1 can be used in applications requiring pairs of matched filters, such as transceiver I and Q channels.The differential inputs and outputs provide a simple interface for wireless systems. The high impedance inputs are easily coupled to differential demodulators or D/A converters. The output DC common mode voltage and output DC offset voltage are adjustable so the signal path can be optimized for driving an A/D converter or differential modulator.Other cutoff frequencies and single-ended I/O can be provided upon request. Please contact LTC Marketing.ApplicationsWCDMA BasestationsCommunication FiltersAntialiasing FiltersSmoothing or Reconstruction FiltersMatched Filter PairsReplacement for LC Filters

The LTC1569-7 is a 10th order lowpass filter featuring linear phase and a root raised cosine amplitude response. The high selectivity of the LTC1569-7 combined with its linear phase in the passband makes it suitable for filtering both in data communications and data acquisition sytems. Furthermore, its root raised cosine response offers the optimum pulse shaping for PAM data communications. The filter attenuation is 50dB at 1.5 • fCUTOFF, 60dB at 2 • fCUTOFF, and in excess of 80dB at 6 • fCUTOFF. DC-accuracy-sensitive applications benefit from the 5mV maximum DC offset.The LTC1569-7 is the first sampled data filter which does not require an external clock yet its cutoff frequency can be set with a single external resistor with a typical accuracy of 3.5% or better. The external resistor programs an internal oscillator whose frequency is divided by either 1, 4 or 16 prior to being applied to the filter network. Pin 5 determines the divider setting. Thus, up to three cutoff frequencies can be obtained for each external resistor value. Using various resistor values and divider settings, the cutoff frequency can be programmed over a range of seven octaves. Alternatively, the cutoff frequency can be set with an external clock and the clock-to-cutoff frequency ratio is 32:1. The ratio of the internal sampling rate to the filter cutoff frequency is 64:1.The LTC1569-7 is fully tested for a cutoff frequency of 256kHz/128kHz with single 5V/3V supply although up to 300kHz cutoff frequencies can be obtained.The LTC1569-7 features power savings modes and it is available in an SO-8 surface mount package.ApplicationsData Communication Filters for 3V OperationLinear Phase and Phase Matched Filters for I/Q Signal ProcessingPin Programmable Cutoff Frequency Lowpass Filters

The LTC®1588/LTC1589/LTC1592 are serial input 12-/14-/16-bit multiplying current output DACs that operates from a single 5V supply. These SoftSpan™DACs can be software-programmed for either unipolar or bipolar mode through a 3-wire SPI interface. In either mode, the voltage output range can also be software-programmed. Two output ranges in unipolar mode and four output ranges in bipolar mode are available.INL and DNL are accurate to 1LSB over the industrial temperature range in both unipolar and bipolar modes. True 16-bit 4-quadrant multiplication is achieved with on-chip four quadrant multiplication resistors. The LTC1588/LTC1589/LTC1592 are available in a 16-lead SSOP package.These devices include an internal deglitcher circuit that reduces the glitch impulse to less than 2nV-s (typ).The asynchronous clear pin resets the LTC1588/LTC1589/ LTC1592 to 0V in unipolar or bipolar mode.ApplicationsProcess Control and Industrial AutomationPrecision InstrumentationDirect Digital Waveform GenerationSoftware-Controlled Gain AdjustmentAutomatic Test Equipment

The LTC1590 is a dual, serial input 12-bit multiplying digital-to-analog converter (DAC). It includes two current output multiplying CMOS DACs and an easy SPI compatible serial interface with daisy-chain output. An asynchronousCLRpin sets both DACs to zero scale.Excellent accuracy, stability and versatility are combined with the smallest package available for a dual 12-bit multiplying DAC.Parts are available in 16-pin PDIP and narrow SO packages and are specified over the commercial and industrial temperature ranges.ApplicationsProcess Control and Industrial AutomationSoftware Controlled Gain AdjustmentDigitally Controlled Filter and Power SuppliesAutomatic Test Equipment

The LTC1591/LTC1597 are pin compatible, parallel input 14-bit and 16-bit multiplying current output DACs that operate from a single 5V supply. INL and DNL are accurate to 1LSB over the industrial temperature range in both 2- and 4-quadrant multiplying modes. True 16-bit 4-quadrant multiplication is achieved with on-chip 4-quadrant multiplication resistors.These DACs include an internal deglitcher circuit that reduces the glitch impulse to less than 2nV-s (typ). The asynchronousCLRpin resets the LTC1591/LTC1597 to zero scale and LTC1591-1/LTC1597-1 to mid-scale.The LTC1591/LTC1597 are available in 28-pin SSOP and PDIP packages and are specified over the industrial temperature range.For serial interface 16-bit current output DACs refer to the LTC1595/LTC1596 data sheet.ApplicationsProcess Control and Industrial AutomationDirect Digital Waveform GenerationSoftware-Controlled Gain AdjustmentAutomatic Test Equipment

The LTC1588/LTC1589/LTC1592 are serial input 12-/14-/16-bit multiplying current output DACs that operates from a single 5V supply. These SoftSpan™DACs can be software-programmed for either unipolar or bipolar mode through a 3-wire SPI interface. In either mode, the voltage output range can also be software-programmed. Two output ranges in unipolar mode and four output ranges in bipolar mode are available.INL and DNL are accurate to 1LSB over the industrial temperature range in both unipolar and bipolar modes. True 16-bit 4-quadrant multiplication is achieved with on-chip four quadrant multiplication resistors. The LTC1588/LTC1589/LTC1592 are available in a 16-lead SSOP package.These devices include an internal deglitcher circuit that reduces the glitch impulse to less than 2nV-s (typ).The asynchronous clear pin resets the LTC1588/LTC1589/ LTC1592 to 0V in unipolar or bipolar mode.ApplicationsProcess Control and Industrial AutomationPrecision InstrumentationDirect Digital Waveform GenerationSoftware-Controlled Gain AdjustmentAutomatic Test Equipment

The LTC1594/LTC1598 are micropower, 12-bit sampling A/D converters that feature 4- and 8-channel multiplexers, respectively. They typically draw only 320µA of supply current when converting and automatically power down to a typical supply current of 1nA between conversions. The LTC1594 is available in a 16-pin SO package and the LTC1598 is packaged in a 24-pin SSOP. Both operate on a 5V supply. The 12-bit, switched-capacitor, successive approximation ADCs include a sample-and-hold.On-chip serial ports allow efficient data transfer to a wide range of microprocessors and microcontrollers over three or four wires. This, coupled with micropower consumption, makes remote location possible and facilitates transmitting data through isolation barriers.The circuit can be used in ratiometric applications or with an external reference. The high impedance analog inputs and the ability to operate with reduced spans (to 1.5V full scale) allow direct connection to sensors and transducers in many applications, eliminating the need for gain stages.ApplicationsPen Screen DigitizingBattery-Operated SystemsRemote Data AcquisitionIsolated Data AcquisitionBattery MonitoringTemperature Measurement