Features and Benefits
- Low Phase Noise Buffer/Driver
- Optimized Conversion of Sine Wave Signals to Logic Levels
- Three Logic Output Types Available
- Additive Jitter 45fsRMS (LTC6957-1)
- Frequency Range Up to 300MHz
- 3.15V to 3.45V Supply Operation
- Low Skew 3ps Typical
- Fully Specified from –40°C to 125°C
- 12-Lead MSOP and 3mm × 3mm DFN Packages
The LTC6957-1/LTC6957-2/LTC6957-3/LTC6957-4 is a family of very low phase noise, dual output AC signal buffer/driver/logic level translators. The input signal can be a sine wave or any logic level (≤2VP-P). There are four members of the family that differ in their output logic signal type as follows:
LTC6957-1: LVPECL Logic Outputs
LTC6957-2: LVDS Logic Outputs
LTC6957-3: CMOS Logic, In-Phase Outputs
LTC6957-4: CMOS Logic, Complementary Outputs
The LTC6957 will buffer and distribute any logic signal with minimal additive noise, however, the part really excels at translating sine wave signals to logic levels. The early amplifier stages have selectable lowpass filtering to minimize the noise while still amplifying the signal to increase its slew rate. This input stage filtering/noise limiting is especially helpful in delivering the lowest possible phase noise signal with slow slewing input signals such as a typical 10MHz sine wave system reference.
- System Reference Frequency Distribution
- High Speed ADC, DAC, DDS Clock Driver
- Military and Secure Radio
- Low Noise Timing Trigger
- Broadband Wireless Transceiver
- High Speed Data Acquisition
- Medical Imaging
- Test and Measurement
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (5)
The AD-SYNCHRONA14-EBZ is an ideal self-contained device to use in evaluation and prototyping of applications that need a highly accurate frequency and phase-controlled source clock. It is designed around the Analog Devices AD9545 and HMC7044 and greatly simplifies clock distribution and multi-channel synchronization in complex systems. It is intended to be used by trained professionals in a laboratory environment, and not intended as an end product for commercial use. It can be taken as a complete reference design and customised as required for any end customer applications. Full design details are made available free of charge.
The AD-SYNCHRONA14-EBZ comes in a 1U mechanical form factor. Using popular industry connector SMA and TwinAX interfaces most labs will already have the needed cables.
With its internal OCXO it can operate in standalone mode or be fed from a choice of external sources, such as 3 separate high speed differential clock inputs, a 10MHz reference and 1PPS. This flexibility combined with the capability to select either of the internal VCXO options of 100MHz or 122.88MHz, gives almost unlimited choice for the frequency of interest and accuracy needed for a wide variety of application areas.
- High accuracy reference clock distribution
- Systems clocked from a single source
- Clocks derived from 100MHz or 122.88MHz
- Phased Array Systems, RADAR, EW, SATCOMS, SDR
- Bench Equipment
- Remote controlled operation
Features & Benefits
- Raspberry Pi 4, ARM Cortex-A72, 2GB SDRAM
- Gigabit Ethernet
- 2 × USB 3.0 ports
- 2 × USB 2.0 ports
- SPI interface
- 2 bicolor LEDs
- Male pin header
Clock Processing Devices
- HMC7044 (High Performance, 3.2 GHz, 14-Output Jitter Attenuator)
- AD9545 (1 PPS Synchronizer and Adaptive Clock Translator)
- 4 x TWINAX LVPECL AC&DC coupled, 100Ω diff
- 2 x SMA LVPECL AC coupled*
- 4 x SMA CMOS*
- 4 x SMA LVDS AC coupled*
*Configurable differential outputs, 50Ω diff
- 3 differential 100Ω SMA clock inputs
- PPS input
- SYNC input
- 10MHz input
- 100Mhz and 122.88Mhz Ultra-Low Phase Noise VCXO's (-165dBc/Hz)
- 40Mhz and 38.4Mhz TCXO's (±1ppm) 50MHz OCXO(+/- 10ppb)
- Internal references are software configurable
- DC 12V, 3A barrel jack
DC1766A-B: Demo Board for the LTC6957 Low Phase Noise, Dual Output Buffer/Driver/Logic Converter.
DC1766A-A: Demo Board for the LTC6957 Low Phase Noise, Dual Output Buffer/Driver/Logic Converter.
DC1765A-B: Demo Board for the LTC6957 Low Phase Noise, Dual Output Buffer/Driver/Logic Converter.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.