The AD9520-5 provides a multioutput clock distributionfunction with subpicosecond jitter performance, along withan on-chip PLL that can be used with an external VCO.The AD9520-5 serial interface supports both SPI and I2C ports.An in-package EEPROM, which can be programmed through theserial interface, can store user-defined register settings forpower-up and chip reset.The AD9520-5 features 12 LVPECL outputs in four groups. Anyof the 1.6 GHz LVPECL outputs can be reconfigured as two250 MHz CMOS outputs. If an application requires LVDSdrivers instead of LVPECL drivers, refer to the AD9522-5.Each group of three outputs has a divider that allows both thedivide ratio (from 1 to 32) and the phase offset or coarse timedelay to be set.The AD9520-5 is available in a 64-lead LFCSP and can be operatedfrom a single 3.3 V supply. The external VCO can have anoperating voltage of up to 5.5 V. A separate output driver powersupply can be from 2.375 V to 3.465 V.The AD9520-5 is specified for operation over the standardindustrial range of −40°C to +85°C. Applications Low jitter, low phase noise clock distribution Clock generation and translation for SONET, 10Ge, 10GFC, Synchronous Ethernet, OTU2/3/4 Forward error correction (G.710) Clocking high speed ADCs, DACs, DDSs, DDCs, DUCs, MxFEs High performance wireless transceivers ATE and high performance instrumentation Broadband infrastructures

Clock & Timer Development Tools LTC6993-4 Demo Board - 100ms, Falling Eg

Real Time Clock

Real Time Clock

Real Time Clock

Real Time Clock

Real Time Clock

The LTC6954 is a family of very low phase noise clock distribution parts. Each part has three outputs and each output has an individually programmable frequency divider and delay. There are four members of the family, differing in their output logic signal type:LTC6954-1: Three LVPECL outputsLTC6954-2: Two LVPECL and one LVDS/CMOS outputsLTC6954-3: One LVPECL and two LVDS/CMOS outputsLTC6954-4: Three LVDS/CMOS outputsEach output is individually programmable to divide the input frequency by any integer from 1 to 63, and to delay each output by 0 to 63 input clock cycles. The output duty cycle is always 50%, regardless of the divide number. The LVDS/CMOS outputs are jumper selectable via the OUTxSEL pins to provide either an LVDS logic output or a CMOS logic output.The LTC6954 also features Linear Technology’s EZSync system for perfect clock synchronization and alignment every time.All device settings are controlled through an SPI-compatible serial port.Applications Clocking High Speed, High Resolution ADCs, DACs and Data Acquisition Systems Low Jitter Clock Distribution

The ADF4155 allows implementation of fractional-N or integer-N phase-locked loop (PLL) frequency synthesizers when used with an external loop filter, external voltage controlled oscillator (VCO), and external reference frequency.The ADF4155 is for use with external VCO parts up to an 8 GHz operating frequency. The high resolution programmable modulus allows synthesis of exact frequencies with 0 Hz error.The VCO frequency can be divided by 1, 2, 4, 8, 16, 32, or 64 to allow the user to generate RF output frequencies as low as 7.8125 MHz.Control of all on-chip registers is through a simple 3-wire interface. The device operates with a nominal power supply of 3.3 V ± 5% and can be powered down when not in use.The ADF4155 is available in a 24-lead, 4 mm × 4 mm LFCSP package.APPLICATIONS Wireless infrastructure (W-CDMA, TD-SCDMA, WiMAX, GSM, PCS, DCS, DECT) Point to point/point to multipoint microwave links Test equipment Wireless LANs, CATV equipment Clock generation

The AD9553 is a phase-locked loop (PLL) based clock translator designed to address the needs of passive optical networks (PON) and base stations. The device employs an integer-N PLL to accommodate the applicable frequency translation requirements. The user supplies up to two single-ended input reference signals or one differential input reference signal via the REFA and REFB inputs. The device supports holdover applications by allowing the user to connect a 25 MHz crystal resonator to the XTAL input.The AD9553 is pin programmable, providing a matrix of standard input/output frequency translations from a list of 15 possible input frequencies to a list of 52 possible output frequency pairs (OUT1 and OUT2). The device also has a 3-wire SPI interface, enabling the user to program custom input-to-output frequency translations.The AD9553 output is compatible with LVPECL, LVDS, or single-ended CMOS logic levels, although the AD9553 is implemented in a strictly CMOS process.The AD9553 operates over the extended industrial temperature range of −40°C to +85°C.APPLICATIONS Cost effective replacement of high frequency VCXO, OCXO, and SAW resonators Extremely flexible frequency translation for SONET/SDH, Ethernet, Fibre Channel, DRFI/DOCSIS, and PON/EPON/GPON Wireless infrastructure Test and measurement (including handheld devices)