Analog Devices Inc./Maxim Integrated

The LTC1562-2 is a low noise, low distortion continuous time filter with rail-to-rail inputs and outputs, optimized for a center frequency (fO) of 20kHz to 300kHz. Unlike most monolithic filters, no clock is needed. Four independent 2nd order filter blocks can be cascaded in any combination, such as one 8th order or two 4th order filters. Each block’s response is programmed with three external resistors for center frequency, Q and gain, using simple design formulas. Each 2nd order block provides lowpass and bandpass outputs. Highpass response is available if an external capacitor replaces one of the resistors. All pass, notch and elliptic responses can also be realized.The LTC1562-2 is designed for applications where dynamic range is important. For example, by cascading 2nd order sections in pairs, the user can configure the IC as a dual 4th order Butterworth lowpass filter with 90dB signal-to-noise ratio from a single 5V power supply. Low level signals can exploit the built-in gain capability of the LTC1562-2. Varying the gain of a section can achieve a dynamic range as high as 114dB with a ±5V supply.Other cutoff frequency ranges can be provided upon request.ApplicationsHigh Resolution Systems (14 Bits to 18 Bits)Antialiasing/Reconstruction FiltersData Communications, EqualizersDual or I-and-Q Channels (Two Matched 4th Order Filters in One Package)Linear Phase FilteringReplacing LC Filter Modules

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 LTC1569-6 is a 10th order lowpass filter featuring linear phase and a root raised cosine amplitude response. The high selectivity of the LTC1569-6 combined with its linear phase in the passband makes it suitable for filtering both in data communications and data acquisition systems. 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 LTC1569-6 sampled data filter 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 six octaves. Alternatively, the cutoff frequency can be set with an external clock and the clock-to-cutoff frequency ratio is 64:1. The ratio of the internal sampling rate to the filter cutoff frequency is 128:1.The LTC1569-6 is fully tested for a cutoff frequency of 64kHz with a single 3V supply.The LTC1569-6 features power saving 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 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