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Linear Technology DC1795A Demo Manual
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Linear Technology DC1795A Demo Manual

Ltc6950 1.4ghz low phase noise, low jitter pll with clock distribution
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Description
Demonstration circuit 1795A features the
1.4GHz low phase noise, low jitter PLL with clock dis-
tribution.
For ease of use, the DC1795A comes installed with a
100MHz reference and a 1GHz VCSO, voltage controlled
SAW oscillator with sine wave output. All differential
inputs and outputs have 0.5" spaced SMA connectors.
The DC1795A has four AC coupled LVPECL outputs with
50Ω transmission lines making them suitable to drive
50Ω impedance instruments. The LVDS/CMOS output is
DC coupled. The LTC6950's EZSync™ function is made
available via a turret and an SMA connector.
Ribbon
cable
connection
to DC590
3.3V DC Supply,
BNC & turret
5V U4 (VCXO) DC
Supply, turret
External VCO
Input, SMA
U3 (VCO) DC
Supply, turret
5V DC Supply,
BNC & turret
Arrow.com.
Downloaded from
1.4GHz Low Phase Noise, Low Jitter PLL
LTC
6950, a
®
LVDS/CMOS
DC-coupled
Stat Outputs,
Outputs, SMA
turrets
External VCO Charge
Pump Output, SMA
Active Loop Filter
and turret
Op-amp (U2) DC
Supply, turret
Figure 1. DC1795A Connections
DEMO MANUAL DC1795A
with Clock Distribution
For the evaluation of the LTC6950 with other VCOs and
references, the DC1795A can be modified to accommodate
different on-board or external components. It also allows
the user the option of a passive or active loop filter.
A DC590 USB serial controller board is used for SPI com-
munication with the LTC6950, controlled by the supplied
ClockWizard™ software.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1795A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and EZSync
and ClockWizard are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TM
EZSync
SYNC Input,
SMA & turret
Frequency Reference
Input, SMA
LTC6950
PECL0
AC Coupled
Outputs, SMA
PECL1
AC Coupled
Outputs, SMA
PECL2
AC Coupled
Outputs, SMA
PECL3
AC Coupled
Outputs, SMA
dc1795af
1

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Summary of Contents for Linear Technology DC1795A

  • Page 1 50Ω impedance instruments. The LVDS/CMOS output is L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and EZSync DC coupled. The LTC6950’s EZSync™ function is made and ClockWizard are trademarks of Linear Technology Corporation. All other trademarks are the available via a turret and an SMA connector.

  • Page 2: Quick Start Procedure

    DEMO MANUAL DC1795A Quick start proceDure The DC1795A is easy to set up to evaluate the performance Connect the DC590 to one of your computer’s USB ports of the LTC6950. Follow the procedure below. with the included USB cable. The DC590 and ClockWizard application are required to CloCkWizArD instAllAtion control the DC1795A through a personal computer (PC).
  • Page 3 DEMO MANUAL DC1795A Quick start proceDure Download the ClockWizard setup file at www.linear.com/ 2. Connect the DC590 to the DC1795A with the provided ClockWizard. ribbon cable. Run the ClockWizard setup file and follow the instructions 3. Run the ClockWizard application.
  • Page 4 Typical DC1795A Requirements and Characteristics table). Dc1795a reconfiguration The DC1795A allows the use of a variety of references, ezsync FunCtion VCOs and active or passive loop filters. The following Apply a 1ms or longer high pulse to the SYNC SMA con- covers the hardware reconfiguration of the DC1795A.
  • Page 5 Tables 3, 4 and 5 cross reference the loop filter options footprints on the board: U3, which accommodates the shown in ClockWizard’s Loop Design tab with the DC1795A popular 0.5" × 0.5" package, and U4, which accommodates component reference designators. Table 3 is dedicated to another common 14mm ×...
  • Page 6 * General Recommendations: There are several termination and common mode options on the DC1795A for different input signal types. Refer to the DC1795A schematic, the LTC6950 data sheet and the data sheet for the VCO or clock distribution component used for an optimum termination network.
  • Page 7 , PECL0 Two Outputs J17 and J16 SMA connectors** AC coupled, 250MHz, 800mV differential*. Must have LTC6950’s IBIAS0 = H with default BOM. DC1795A has options for an external pull down resistor if IBIAS0 = L. – PECL1 , PECL1...

  • Page 8: Layout Top Layer

    DEMO MANUAL DC1795A layout top layer dc1795af Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...

  • Page 9: Parts List

    DEMO MANUAL DC1795A parts list iteM reFerenCe PArt DesCriPtion MAnuFACturer/PArt nuMber CI1_A, C22, C29, CP_A CAP., 0603 CI1_P CAP., X7R, 0.1µF, 25V, 10%, 0603 AVX, 06033C104KAT2A CI2_A CAP., 1206 CI2_P CAP., X7R, 0.56µF, 25V, 10%, 1206 AVX, 12063C564KAT2A CP_P CAP., X7R, 0.056µF, 16V, 10%, 0603...

  • Page 10: Schematic Diagram

    DEMO MANUAL DC1795A schematic Diagram dc1795af Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 11 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
  • Page 12 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following As is conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for engineering DeVeloPMent or eVAluAtion PurPoses onlY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.