Overview

The RC18008A is a fully integrated clock and SYSREF signal eight output fanout buffer for JESD204B/C applications. It is designed as a high-performance clock and converter synchronization solution for wireless base station radio equipment boards with JESD204B/C subclass 0, 1, and 2 compliances. The main function of the device is the distribution and fanout of high-frequency clocks and low-frequency system reference signals generated by a JESB204B/C clock generator such as the RC38312A, extending its fanout capabilities and providing additional phase-delay. The RC18008A is optimized to deliver very low phase noise clocks and precise, phase-adjustable SYSREF synchronization signals. Low-skew outputs, low device-to-device skew characteristics and fast output rise/fall times help the system design to achieve deterministic clock and SYSREF phase relationship across devices.

  • Distribution, fanout, phase-delay of clock, and SYSREF signals
  • Low output noise floor: -163dBc/Hz (245.76MHz)
  • Supports clock frequencies up to 3GHz, including clock output frequencies of 983.04MHz, 491.52MHz, 245.76MHz, and 122.88MHz
  • Phase alignment mode across multiple buffers with any frequency divider setting
  • Configuration through 3-wire SPI interface
  • Supply voltage:
    • 3.3V core and signal I/O
    • 1.8V digital control SPI I/O (3.3V-tolerant inputs)
  • Reference inputs are fail-safe
  • Provides four output channels with a total of 8 differential outputs
  • Outputs channels include:
    • Dedicated clock outputs
    • Outputs configurable as SYSREF outputs with individual phase delay stages, or configurable as additional clock outputs
    • Clock outputs are powered-on/enabled at startup
    • QREF_r (SYSREF) outputs disabled at startup
  • Each clock channel contains:
    • Frequency Dividers: ÷1, ÷2, ÷3, ÷4, ÷6, ÷8, ÷12, ÷16, ÷24
    • Clock phase delay circuits, delay unit is the clock period; 256 steps
  • SYSREF: Configurable precision phase delay circuits: 8 steps of 131ps, 262ps, 393ps, or 524ps
  • Flexible differential outputs:
    • LVDS/LVPECL/AC-HCSL
    • Amplitude configurable for LVDS and LVPECL
    • Power-down modes for unused outputs
    • Supports DC and AC coupling
    • QREF_r (SYSREF) output pre-bias feature to prevent glitches when turning output on or off
  • Package: 40-VFQFPN (6.0 × 6.0 × 0.9 mm)
  • Ambient temperature range: -40°C to +105°C (case)

Applications

  • Wireless infrastructure applications: 4G, 5G, and mmWave
  • Frequency divider synchronization across multiple devices
  • Ideal clock driver for jitter-sensitive ADC and DAC circuits
  • Radar, imaging, instrumentation, and medical

Documentation

= Featured Documentation
Type Title Date
Datasheet
RC18008 Datasheet
PDF 1.75 MB
Overview
RF Timing Family Product Overview
PDF 331 KB
2 items

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Explore ECAD Models
Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Moisture Sensitivity Level (MSL)
    Price (USD) | 1ku
    Buy / Sample
    Part Number
    RC18008AGNC#BB0
    circleActive
    memory
    view_in_ar
    Samples Available
    		 VFQFPN 40 I Yes Tray Get Samples,
    RC18008AGNC#KB0
    circleActive
    memory
    view_in_ar
    		VFQFPN 40 I Yes Reel
    Parametric Table tips

    Tips for Using This Parametric Table:

    • Hide Filters button in header: Collapse or expands filters
    • Column sort buttons in header: Sort Column alphabetically / numerically descending or ascending
    • Reset button in header: Reset all filters to the page default
    • Full Screen button in header: Expand the table to full screen view (user must close out of full screen before they can interact with rest of page)
    • Export button in header: Export the filtered results of the table to an Excel document
    • Filter parts search bar in header: Type to filter table results by part number
    • Hide column button in column headers: Select to hide columns in table
    • AND / OR toggle switches in header: Toggles the logic of this particular filter to be “AND” or “OR” logic for filtering results
    • Multiselect checkboxes at beginning of each row in table: Select these checkboxes to compare products against each other
    • Document icon next to product name in row: View the featured document for this product
    • Chip icon next to the right of the document icon in row: View the block diagram for this product
    • Cart icon to the right of the chip icon: Indicates that samples are available for this product