Analog Devices LTC6955 Demo Manual
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Analog Devices LTC6955 Demo Manual

Analog Devices LTC6955 Demo Manual

Ultralow jitter 11 output fanout buffer
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DESCRIPTION
Demonstration Circuit 2611A features the
LTC6955-1, Ultralow Jitter 11 Output Fanout Buffers.
By default, the DC2611A is powered from a single 3.3V
supply. An option is provided to power to the DC2611A
from dual supplies, allowing for the LTC6955's output
supply pins to connect to an LTC Silent Switcher
LTC6955 input supply pin to connect to a low noise LDO.
The differential inputs and six of the differential outputs
are populated with 0.5" spaced SMA connectors. These
outputs are AC-coupled with 50Ω transmission lines
CAL_OUT,
SMA
OUT10, CML
AC-coupled
Outputs, SMA
OUTPUT SEL,
Switches
TEMP, turret
OUT8, CML
AC-coupled
Outputs, SMA
OUT6, CML
AC-coupled
Outputs, SMA
DEMO MANUAL DC2611A
Ultralow Jitter 11 Output
LTC
6955/
making them suitable to drive 50Ω impedance instru-
®
ments. The remaining four differential outputs are termi-
nated with 100Ω.
A calibration path is provided to aid in accurate LTC6955
propagation delay measurements. The calibration path
and the
can be also reconfigured as a DC path, which allows for
®
a convenient method of locking the LTC6955 outputs to
an external PLL/VCO, as shown in Figure 2.
Design files for this circuit board are
All registered trademarks and trademarks are the property of their respective owners.
Single Supply 3.3V Input,
banana jacks J27 & J28
Figure 1. DC2611A Connections
LTC6955/LTC6955-1
Fanout Buffer
available.
CAL_IN,
SMA
FILT, Header
IN Input, SMA
VIN33 Option,
DC2611 Reconfiguration
OUT0, CML
AC-coupled
Outputs, SMA
OUT1, CML
AC-coupled
Outputs, SMA
OUT4, CML
AC-coupled
Outputs, SMA
Refer to
Rev. 0
1

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Summary of Contents for Analog Devices LTC6955

  • Page 1 DC path, which allows for ® LTC6955 input supply pin to connect to a low noise LDO. a convenient method of locking the LTC6955 outputs to an external PLL/VCO, as shown in Figure 2.

  • Page 2: Quick Start Procedure

    2. Connect a low phase-noise (or jitter) single-ended sig- 1. For unexpected spurious response, verify power sup- nal to IN– (J25). Refer to the LTC6955 data sheet for plies are low noise and spurious free power supplies. acceptable input frequencies and amplitudes.
  • Page 3 100Ω termination, and install the appropriate SMAs efficiency over the low noise LDO. A spurious free supply, and AC blocking capacitors. such as a low noise LDO, is required on the LTC6955’s supply pin. Refer to LTC6955 data sheet for differential termination options.
  • Page 4 DEMO MANUAL DC2611A DC2611A RECONFIGURATION Change C56 & C57 to 0 ohm resistors Figure 2. Alternate Configuration, Locking LTC6955 Outputs to an External PLL/VCO Rev. 0...

  • Page 5: Assembly Options

    DEMO MANUAL DC2611A TYPICAL DC2611A REQUIREMENTS AND CHARACTERISTICS Table 4. PARAMETER INPUT OR OUTPUT PHYSICAL LOCATION DETAILS 3.3V Power Supply Input J27 and J28 BNC Banana Jacks If R18 populated, default option, single supply: 3.3V low- noise and spur-free supply, 1A; If R18 depopulated, dual supply option, allows for experiments with more efficient power supply evaluation (Silent Switcher).

  • Page 6: Pcb Layout

    DEMO MANUAL DC2611A PCB LAYOUT Top Layer Rev. 0...

  • Page 7: Parts List

    DEMO MANUAL DC2611A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C1, C2, C5, C6, C9-C12, C17, C18, CAP ., X7R, 0.1µF, 10V, 10%, 0402 MURATA, GRM155R71A104KA01D C21, C22, C50, C56, C57 C3, C4, C7, C8, C13-C16, C19, C20 CAP ., 0402 C25-C36 CAP ., X7R, 0.01µF, 6.3V, 10%, 0201...
  • Page 8 DEMO MANUAL DC2611A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC2611A3-A Required Circuit Components DC2611A3-GENERAL BOM C58, C59, C61 CAP ., X7R, 0.1µF, 10V, 10%, 0402 MURATA, GRM155R71A104KA01D CAP ., 0402 RES., CHIP , 0Ω, 1/20W, 1% 0201 VISHAY, CRCW02010000Z0ED RES., CHIP , 75Ω, 1/16W, 1% 0402 VISHAY, CRCW040275R0FKED...

  • Page 9: Schematic Diagram

    Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
  • Page 10 Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY.

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