Analog Devices Linear Technology LTC6953 Quick setup guide

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dc2610af
DEMO MANUAL DC2610A
DESCRIPTION
LTC6953
Ultralow Jitter, 4.5GHz Clock Distributor with 11 Outputs
and JESD204B Support
Demonstration circuit 2610A features the LTC6953, an
Ultralow Jitter, 4.5GHz Clock Distributor with 11 Outputs
and JESD204B Support.
By default, the DC2610A is powered from a single 3.3V
supply. An option is provided to power to the DC2610A
from dual supplies, allowing for the LTC6953’s output
supply pins to connect to an LTC Silent Switcher
®
and the
LTC6953 input supply pin to connect to a low noise LDO.
All differential inputs and seven of the differential outputs
are populated with 0.5”spaced SMA connectors. These
outputs are AC-coupled with 50Ω transmission lines mak -
ing them suitable to drive 50Ω impedance instruments.
The remaining four differential outputs are terminated
with 100Ω.
L, LT, LTC, LTM, Linear Technology, Silent Switcher and the Linear logo are registered
trademarks and LTC6952 Wizard, QuickEval and EZSync are trademarks of Analog Devices, Inc.
All other trademarks are the property of their respective owners.
The LTC6953’s EZSync™and SYSREF request func-
tions are made available via the LTC6953 SPI interface
or the EZS_SRQ SMA/turret connectors. The DC2609A,
DC2610A, and DC2611A SMA placement was designed
for ease of connection for all multi-part synchronization
and SYSREF request modes.
A calibration path is provided to aid in accurate LTC6953
propagation delay measurements.
A DC2026 USB serial controller board is used for SPI
communication with the LTC6953, controlled by the sup-
plied LTC6952Wizard™ software.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2610A
EZS_SRQ INPUT,
SMA & TURRET
RIBBON CABLE CONNECTION
TO DC590 OR DC2026
OUT1, CML
OUTPUTS, SMA
OUT0, CML
OUTPUTS, SMA
SINGLE SUPPLY
J30 & J31
OUT9, CML
OUTPUTS, SMA
OUT8, CML
OUTPUTS, SMA
OUT10, CML
OUTPUTS, SMA
IN INPUT,
SMA & TURRET
VIN33 OPTION,
OUT5, CML
OUTPUTS, SMA OUT4, CML
OUTPUTS, SMA
STAT LED, D1
AC-COUPLED
AC-COUPLED
3.3V INPUT,
BANANA JACKS
AC-COUPLED
AC-COUPLED
AC-COUPLED
REFER TO DC2610
RECONFIGURATION
AC-COUPLED
AC-COUPLED
LTC6953
DEMO CIRCUIT 2610A
Figure 1. DC2610A Connections

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DEMO MANUAL DC2610A
QUICK START PROCEDURE
The DC2610A is easy to set up to evaluate the perfor-
mance of the LTC6953. Follow the procedure below.
The LTC6952Wizard and the DC2026 are required to con-
trol the DC2610A through a personal computer (PC).
DC2026 CONFIGURATION
Refer to Figure 2. Set the JP3 jumper to the 3.3V (pre-
ferred) or 5V position.
Connect the DC2026 to one of your computer’s USB ports
with the included USB cable.
The DC2026 has the ability to run Linduino code, refer
to http://www.linear.com/solutions/linduino and the Fre-
quently Asked Question section (Question #2) for more
details.
LTC6952WIZARD INSTALLATION
The LTC6952Wizard software is used to communi-
cate with the LTC6953. It uses the DC2026 to translate
between USB and SPI-compatible serial communications
formats. It also includes advanced design and simulation
capabilities. The following are the LTC6952Wizard system
requirements:
•Windows Operating System:Windows XP, Windows
2003 Server, Windows Vista, Windows 7
• Microsoft .NET 3.5 SP1 or later
• Windows Installer 3.1 or later
•Linear Technology’s DC2026 (with the DC590B emula-
tor sketch loaded)
The DC2026 arrives from the factory with the DC590B
Emulator sketch loaded. If this is not the case refer to the
troubleshooting section.
Figure 2. DC2026 Connector Location
J5, USB
CONNECTION
TO PC
J1, RIBBON CABLE
CONNECTION
TO DC2610A
JP3,SELECT
3.3V OPTION

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DEMO MANUAL DC2610A
QUICK START PROCEDURE
Download the LTC6952Wizard setup file at www.linear.
com/LTC6952Wizard.
Run the LTC6952Wizard setup file and follow the instruc -
tions given on the screen. The setup file will verify and/
or install Microsoft .NET and install the LTC6952Wizard.
Refer to the LTC6952Wizard Help menu for software
operation.
DC2610A CONFIGURATION
1. Connect J30 and J31 to a power supply and apply
power (see Figure 1 and the Typical DC2610A Require-
ments and Characteristics table).
2. Connect the DC2026 to the DC2610A with the provided
ribbon cable.
3. Connect a low phase-noise (low jitter) single-ended
signal to IN–(J28). Refer to the LTC6953 data sheet
for acceptable input frequencies and amplitudes.
4. Run the LTC6952Wizard application.
5. In LTC6952Wizard, click File →Load Settings and
select file “LTC6953 EZSync StandAlone.6952set”.
The DC2610A’s red STAT LED (D1) should illuminate.
6. From the LTC6952Wizard, update Fin to the frequency
of the input signal in step 3. This will update the
LTC6952Wizard with the correct output frequencies.
7. Synchronize outputs by toggling the LTC6953 SSYNC
bit on then off from the LTC6952Wizard.
8. Connect desired output (OUT10, OUT9, OUT8, OUT5,
OUT4, OUT1 or OUT0) to a test instrument or other
demo board to evaluate performance.
Be sure to power down or terminate any unused RF output
with 50Ω, or poor spurious performance may result.
Figure 3. LTC6952Wizard Screenshot

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DEMO MANUAL DC2610A
TROUBLESHOOTING GUIDE
If the red LED (D1) does not illuminate:
1. Ensure LTC6953 input signal is at the LTC6953 IN
–
pin.
2. In LTC6952Wizard’s System tab click ‘Read All’.
LTC6952Wizard should match Figure 3. If not, see ‘Verify
DC2610A and LTC6952Wizard Communication’
Verify DC2610A and LTC6952Wizard Communication:
To verify communication with the DC2610A. The bottom
status line in LTC6952Wizard should read “LTC6953”and
“Comm Enabled”as shown in Figure 3. If not, then per-
form the following steps:
1. Ensure the DC2026 is connected to PC
2. Disconnect and Reconnect DC2026 to PC
3. Ensure DC2026 is connected to DC2610A
4. Close LTC6952Wizard and restart
5. Verify the DC2026 has the DC590B Emulator sketch
loaded by contacting the factory or following these
steps.
a. Download QuickEval™ at
http://www.linear.com/designtools/software/#Data
b. Run QuickEval (Linduino connected to the PC)
If QuickEval does not find a DC590B, reload the DC590
Linduino sketch. To use the LTSketchbook refer to the Lin-
duino QuickStart tab at http://www.linear.com/solutions/
linduino for instructions on how to start using Linduino.
If DC2610A performance is less than the LTC6953 data
sheet specifications:
1. For unexpected spurious response, verify power sup-
plies are low noise and spurious free power supplies.
Power supplies that are based off a switching regulator
architecture are known to generate spurs on low jitter
clock outputs.
2. For poor phase noise results, verify the phase noise
specifications of the input signal and the phase noise
measurement instrument. Traditional signal sources
and spectrum analyzers have higher phase noise than
the LTC6953 and will degrade measurement results.
To measure phase noise performance it is recom-
mended to use a low jitter oscillator and a signal source
analyzer, such as Keysight’s (previously Agilent/HP)
E5052.
3. Contact the factory for further troubleshooting.

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DEMO MANUAL DC2610A
DC2610A RECONFIGURATION
The following covers the hardware reconfiguration of the
DC2610A. Refer to LTC6952Wizard and the LTC6953 data
sheet to better understand how to change programmed
parameters on the DC2610A.
POWER SUPPLY OPTIONS
Table 1 provides the power supply options for DC2610A.
By default the DC2610A is setup to use the single supply
option. However, a dual supply option is available to power
the higher current supply from an LTC Silent Switcher,
such as the LT8609S. The LTC Silent Switcher improves
the power efficiency over the low noise LDO. A low noise
LDO is required on the LTC6953’s VIN+supply pin.
Table 1. Power Supply Options
Power Supply Voltage/Current
(Recommended Supply)
Default Option R4 J30 (3.3V) E23 (VIN33)
X Single
Supply
Installed 3.3V/1.5A
(Low Noise LDO)
NA
Dual
Supply
Do Not
Install
3.3V/1.5A
(LTC Silent
Switcher)
3.3V/150mA
(Low Noise LDO)
INPUT TERMINATION OPTIONS
Table 2 provides the single-ended and differential input
termination options. By default the DC2610A is setup for
a single-ended input on the IN–SMA (J28).
Table 2: Input Termination Options (*)
Default Termination R26
Ω
R30
Ω
R29
Ω
R37
Ω
C59
µF
C60
µF
X SE, IN–75 30 DNI DNI 0.1 DNI
SE, IN+30 75 DNI DNI DNI 0.1
DIFF, CML or
PECL
DNI DNI 160 DNI 0.1 0.1
DIFF, LVDS DNI DNI DNI 160 0.1 0.1
* SE = Single-Ended, DIFF = Differential, DNI = Do Not Install
LTC6953 6952SET FILES
The LTC6952Wizard provides a 6952set file for all
LTC6953 data sheet application examples and typical
application circuits. After loading a 6952set file a pop-up
window will detail any user actions and board modifica-
tions required for the selected file.
SYNC OPTIONS
The LTC6953 data sheet describes several synchroniza-
tion modes. After selecting the desired synchronization
mode, refer to Table 3 to identify the required DC2610A
board modifications. Refer to the LTC6953 data sheet for
SYNC timing and level requirements.
CML OUTPUTS, OUT[10:0]
The DC2610A has 11 CML outputs. Seven of these out-
puts are AC-coupled and brought out to SMAs (OUT10,
OUT9, OUT8, OUT5, OUT4, OUT1, and OUT0). To drive
50Ω impedance instruments connect OUTx+to the instru-
ment and OUTx–to a 50Ω termination, or vice versa.
The remaining four outputs (OUT7, OUT6, OUT3, and
OUT2) are terminated with a 100Ω resistor on board. To
connect these outputs to a 50Ω instrument, remove the
100Ω termination, and install the appropriate SMAs and
AC blocking capacitors.
Refer to LTC6953 data sheet for differential termination
options.

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DEMO MANUAL DC2610A
Table 3. LTC6953 Sync Mode Programming Options
Board Modifications (DNI = Do Not Install)
SYNC/SYSREF
Method
EZS_SRQ Pins
State
R27 (Ω) R24 (Ω) R25 (Ω) R28 (Ω) R23 (Ω) R39 (Ω) R38 (Ω)
EZS_SRQ Pin Differential, CML
or LVPECL
DNI DNI 100 0 0 DNI DNI
Differential LVDS 100 100 750 50 50 130 130
EZS_SRQ+: CMOS
EZS_SRQ–: GND
200k 0 DNI 0 0 DNI DNI
SSRQ Register Bit EZS_SRQ+: GND
EZS_SRQ–: GND
200k 0 DNI 0 0 DNI DNI
DC2610A RECONFIGURATION
FREQUENTLY ASKED QUESTIONS
1. Can the LTC6952Wizard control a LTC6953 on a board other than the DC2610A?
Yes, follow these steps.
Step 1: Configure the DC2026 for 3.3V SPI as shown in Figure 2
Step 2:Connect the DC2026 J1 connector SPI pins to the LTC6953 SPI pins. Refer to page two of the DC2610A sche-
matic for pin assignments.
2. Does the LTC6953 have Linduino Code available?
Yes, download the LTC6953 sketch in the LTSketchbook. To use the LTSketchbook and for instructions on how to
start using Linduino refer to the Linduino QuickStart tab at http://www.linear.com/solutions/linduino. This will give
programmers a head start in writing code for the LTC6953. It is recommended to use LTC6952Wizard to create the
best possible register settings for all conditions. These LTC6953 register settings from LTC6952Wizard can be pro-
grammed in a lookup table.

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DEMO MANUAL DC2610A
TYPICAL DC2610A REQUIREMENTS AND CHARACTERISTICS
ASSEMBLY OPTIONS
PARAMETER INPUT OR OUTPUT PHYSICAL LOCATION DETAILS
3.3V Power Supply Input J30 and J31 BNC Banana Jacks If R4 Populated, Default Option, Single Supply: 3.3V
Low-noise and spur-free supply, 1.5A;
If R4 Depopulated, Dual Supply Option, allows
for experiments with more efficient power supply
evaluation (LTC Silent Switcher).
See 3.3V Power Supply #2 (VIN33)
3.3V Power Supply #2 (VIN33) Input E23 turret (VIN33) If R4 Depopulated, Dual Supply Option, 3.3V Low-
noise and spur-free supply, 150mA;
OUT10+; OUT10–Two Outputs J1 and J2 SMA Connectors* CML, AC-Coupled, 800mVpk Differential
OUT9+; OUT9–J3 and J4 SMA Connectors*
OUT8+; OUT8–J5 and J6 SMA Connectors*
OUT5+; OUT5–J19 and J20 SMA Connectors*
OUT4+; OUT4–J17 and J18 SMA Connectors*
OUT1+; OUT1–J11 and J12 SMA Connectors*
OUT0+; OUT0–J9 and J10 SMA Connectors*
OUT7+; OUT7–Two Outputs
(Not Connected)
J7 and J8 (SMA Not Populated) Onboard Differential 100Ω termination
OUT6+; OUT6–J21 and J22 (SMA Not Populated)
OUT3+; OUT3–J15 and J16 (SMA Not Populated)
OUT2+; OUT2–J13 and J14 (SMA Not Populated)
IN+Input
(Not connected)
J29 SMA Connector Default: Not Connected
(see Table 2, for correct input termination options)
IN–Input J28 SMA Connector Default: Preferred Single Ended Input
(see Table 2, for correct input termination options)
EZS_SRQ+Input J27 SMA Connector/E20 Turret Default: Preferred Single Ended Input
EZS_SRQ–Input J26 SMA Connector/E19 Turret Default: Shorted to GND
ISD Input Test Point 3.3V(Default): Device Active, set by pull-up resistor
GND: Shut Down Device
STAT Output STATUS Turret Red LED D1 illuminates when STAT pin in high state
*Any unused RF output must be powered down or terminated with 50Ω, or poor spurious performance may result.
Table 5. DC2610A Options
Assembly Version Part Number
DC2610A-A LTC6953IUKG

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DEMO MANUAL DC2610A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 24 C1-C12, C17-C20, C51-C59, C61 CAP., X7R, 0.1µF, 10V, 10%, 0402 MURATA, GRM155R71A104KA01D
2 0 C7, C8, C13-C16, C21, C22, C60 CAP., 0402 OPT
3 13 C24-C36 CAP., X7R, 0.01µF, 6.3V, 10%, 0201 MURATA, GRM033R70J103KA01D
4 1 C37 CAP., X5R, 0.1µF, 16V, 10%, 0201 MURATA, GRM033R61C104KE14D
5 11 C38-C48 CAP., X5R, 1µF, 16V, 10%, 0402 MURATA, GRM155R61C105KE01D
6 1 C49 CAP., X7R, 10µF, 25V, 10%, 1206 MURATA, GRM31CR71E106KA12L
7 1 C62 CAP.,TANT., 330µF,10V, 10%, 7343 AVX, TPME337K010R0035
8 1 D1 LED, RED, LED-ROHM-SML-01 ROHM, SML-012V8TT86
9 10 E14-E23 TURRET, TESTPOINT 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0
10 1 JP1 CONN., HEADER, MALE, 1 ×3, 2mm, THT Wurth Elektronik, 62000311121
11 20 J1-J6, J9-J12, J17-J20, J24-J29 CONN., SMA 50Ω EDGE-LAUNCH CCSJ, 142-0701-851
12 0 J7, J8, J13-J16, J21, J22 CONN., SMA 50Ω EDGE-LAUNCH OPT
13 1 J23 CONN., HEADER, 14-PIN, 2mm MOLEX, 87831-1420
14 2 J30, J31 CONN, JACK, BANANA KEYSTONE, 575-4
15 5 R4, R19, R23, R24, R28 RES., CHIP, 0, 1/10W, 0402 VISHAY, CRCW04020000Z0ED
16 6 R6, R10, R11, R21, R27, R36 RES., CHIP, 200K, 1/10W, 1% 0402 VISHAY, CRCW0402200KFKED
17 9 R7-R9, R18, R31-R35 RES., CHIP, 100, 1/16W, 1% 0402 VISHAY, CRCW0402100RFKED
18 3 R12, R13, R14 RES., CHIP, 4.99K, 1/10W, 1% 0402 VISHAY, CRCW04024K99FKED
19 0 R15, R29, R37, R38, R39 RES., 0402 OPT
20 1 R20 RES., CHIP, 0, 1/10W, 0603 VISHAY, CRCW06030000Z0EA
21 1 R22 RES., CHIP, 330, 1/16W, 1% 0402 VISHAY, CRCW0402330RFKED
22 0 R25 RES., CHIP, 100, 1/16W, 1% 0402 OPT
23 1 R26 RES., CHIP, 75, 1/16W, 1% 0402 VISHAY, CRCW040275R0FKED
24 1 R30 RES., CHIP, 30, 1/16W, 1% 0402 VISHAY, CRCW040230R0FKED
25 1 U1 I.C., QFN52UKG-7 ×8 LINEAR TECH., LTC6953IUKG#PBF
26 1 U2 I.C., Serial EEPROM, TSSOP8 MICROCHIP, 24LC025-I /ST
27 2 U3,U4 I.C., Dual Buffer, SC70-6 FAIRCHILD SEMI., NC7WZ17P6X
28 1 U5 I.C., Single Bit, Dual Supply, 3-State Output, SOT363 NXP SEMI., 74LVC1T45GW,125
29 1 SHUNT ON JP1 (1&2) SHUNT, 2mm Wurth Elektronik, 60800213421
30 4 MH1-MH4 STANDOFF, NYLON, 0.5, 1/2" Wurth Elektronik, 702935000
31 1 DUST CAP FOR J29 WYHP DUST CAP FOR SMA FEMALE RF CONN AMAZON,

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DEMO MANUAL DC2610A
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
3.3V SUPPLIES
1. ALL RESISTORS AND CAPACITORS ARE 0402. NOTES: UNLESS OTHERWISE SPECIFIED
PLACE ON TOP SIDE PLACE ON BOTTOM SIDE
[3] [2]
[2]. J29 = INSTALLED BUT UNUSED. [3]. COMPONENTS WILL BE STUFFED WITH DEFAULT VALUES.
IN-/IN+ TERMINATIONS OPTIONS
DIFFERENTIAL S-E IN- (DEFAULT) S-E IN+
R26 R29 R30 C59 C60
OPT75 30 0.1uF
0.1uF0.1uF
7530 OPT OPT
OPT
0.1uF
OPTOPT 160
OTHER VALUES ARE FOR LAB USED ONLY.
[3] [3]
[3] [3]
ALL INPUT AND OUTPUT CONNECTIONS ARE SAME LENGTH, 50 OHM CONTROLLED IMPEDANCE, USING 20 MIL TRACES, 20 MIL GAP.
OUT0+ OUT0- OUT1+ OUT1- OUT2+ OUT2- OUT3+ OUT4+ OUT4- OUT5+ OUT5- OUT6+ OUT6-
OUT7+ OUT7- OUT8+ OUT8- OUT9- OUT10- OUT10+
STAT
EZS_SRQ- EZS_SRQ+
IN- IN+
OUT9+
OUT3-
3.3V
3.3V 3.3V
3.3V 3.3V 3.3V 3.3V
3.3V 3.3V 3.3V 3.3V
3.3V 3.3V 3.3V
3.3V VIN33
VIN33
3.3V
VIN33
VIN33
SDCS
SDI
SDO
SCLK
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
CHRIS P.2ND PROTOTYPE
__ 2 03-21-17
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
CHRIS P.2ND PROTOTYPE
__ 2 03-21-17
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
CHRIS P.2ND PROTOTYPE
__ 2 03-21-17
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
DEMO CIRCUIT 2610A
Tuesday, March 21, 2017
12
ULTRALOW JITTER CLOCK DISTRIBUTOR
N/A
LTC6953IUKG
KIM T.
CHRIS P.
WITH 11 OUTPUTS AND JESD204B SUPPORT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
DEMO CIRCUIT 2610A
Tuesday, March 21, 2017
12
ULTRALOW JITTER CLOCK DISTRIBUTOR
N/A
LTC6953IUKG
KIM T.
CHRIS P.
WITH 11 OUTPUTS AND JESD204B SUPPORT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
DEMO CIRCUIT 2610A
Tuesday, March 21, 2017
12
ULTRALOW JITTER CLOCK DISTRIBUTOR
N/A
LTC6953IUKG
KIM T.
CHRIS P.
WITH 11 OUTPUTS AND JESD204B SUPPORT
J10
SMA
OUT0-
C25
0.01uF
0201
E23
VIN33
C56 0.1uF
J13
SMA
OUT2+
OPT
J5
SMA
OUT8-
C6 0.1uF
J29
SMA
IN+
U1
LTC6953
VOUT+ 32
OUT1+ 31
OUT1- 30
VOUT+ 29
OUT2+ 28
OUT2- 27
VOUT+
26
OUT3+
25
OUT3-
24
VOUT+
23
VOUT+
14
CS
1
VD+
2
OUT10-
3
OUT10+
4
VOUT+
5
OUT9-
6
OUT9+
7
VOUT+
8
OUT8-
9
OUT8+
10
VOUT+
11
OUT7-
12
VIN+ 39
IN- 38
OUT7+
13
VOUT+
20
VOUT+
17
OUT5+
19
OUT6+
16
OUT4-
21
OUT4+
22
OUT5-
18
IN+ 37
NC 36
OUT0+ 34
VOUT+ 35
OUT6-
15
OUT0- 33
SD 40
GND 41
NC 42
NC 43
VREF+ 44
NC 45
NC 46
EZS_SRQ+ 47
EZS_SRQ- 48
STAT 49
SCLK 50
SDO 51
SDI 52
EP 53
J4
SMA
OUT9+
C61 0.1uF
C19 0.1uF C20 0.1uF
J14
SMA
OUT2-
OPT
JP1
HD1X3-079
LED
NC
STAT 1
3 2
C3 0.1uF
C32
0.01uF
0201
C15 OPT
R22 330
J3
SMA
OUT9-
E22
C57 0.1uF
C30
0.01uF
0201
C18 0.1uF
C28
0.01uF
0201
J16
SMA
OUT3-
OPT
C14 OPT
R29 OPT
R28
0
J17
SMA
OUT4+
C5 0.1uF
J24
SMA
CAL_OUT
R33 100
E15
GND
R32 100
J20
SMA
OUT5-
C37 0.1uF 0201
C10 0.1uF
J18
SMA
OUT4-
C31
0.01uF
0201
E14
GND
J26
SMA
EZS_SRQ-
C48 1uF
J8
SMA
OUT7+
OPT
E20
EZS_SRQ+
C35
0.01uF
0201
C59 0.1uF
C17 0.1uF
J6
SMA
OUT8+
C8 OPT
J15
SMA
OUT3+
OPT
C42 1uF
C1 0.1uF
C24
0.01uF
0201
C21 OPT
J11
SMA
OUT1+
E21
J25
SMA
CAL_IN
R4
0
R24 0
C13 OPT
R25 100 OPT
R39 OPT
C44 1uF
C22 OPT
J30
3.3V
KEY-575
E18
GND
J1
SMA
OUT10-
C43 1uF
C29
0.01uF
0201
C38 1uF
R26 75
R38 OPT
C2 0.1uF
J9
SMA
OUT0+
C46 1uF
J21
SMA
OUT6+
OPT
J19
SMA
OUT5+
C47 1uF
+
C62 330uF 10V 7343
C45 1uF
C7 OPT
C34
0.01uF
0201
R23
0
J28
SMA
IN-
C11 0.1uF
J12
SMA
OUT1-
C27
0.01uF
0201
J22
SMA
OUT6-
OPT
R31 100
C9 0.1uF
J27
SMA
EZS_SRQ+
E19
EZS_SRQ-
R27 200k
C39 1uF C40
1uF C41
1uF
R30 30
C12 0.1uF
C26
0.01uF
0201
E16
GND
J7
SMA
OUT7-
OPT
C58 0.1uF
E17
GND
C36 0.01uF 0201
C49 10uF 1206 C33
0.01uF
0201
J31
GND
KEY-575
C16 OPT
J2
SMA
OUT10+
D1 RED STAT
2 1
R37 OPT
R34 100
C60 OPT
C4 0.1uF

10
dc2610af
DEMO MANUAL DC2610A
SCHEMATIC DIAGRAM
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
EEPROM FOR BOARD IDENTIFICATION
DC2026 (DC590) SPI INTERFACE
3.3V
3.3V 3.3V 3.3V
3.3V
CS SCLK SDI SDO SD
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
DEMO CIRCUIT 2610A
Tuesday, March 21, 2017
22
ULTRALOW JITTER CLOCK DISTRIBUTOR
N/A
LTC6953IUKG
KIM T.
CHRIS P.
WITH 11 OUTPUTS AND JESD204B SUPPORT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
DEMO CIRCUIT 2610A
Tuesday, March 21, 2017
22
ULTRALOW JITTER CLOCK DISTRIBUTOR
N/A
LTC6953IUKG
KIM T.
CHRIS P.
WITH 11 OUTPUTS AND JESD204B SUPPORT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
DEMO CIRCUIT 2610A
Tuesday, March 21, 2017
22
ULTRALOW JITTER CLOCK DISTRIBUTOR
N/A
LTC6953IUKG
KIM T.
CHRIS P.
WITH 11 OUTPUTS AND JESD204B SUPPORT
R19
0
R10 200k
EEGND
R6 200k
R20 0 0603
R8 100
R11 200k
R18 100
SD
GND VCC
U4
NC7WZ17P6X
1 6
43 52
R9 100
GND VCC
U3
NC7WZ17P6X
1 6
43 52
C51 0.1uF
V+DIG
C53 0.1uF
R7 100
R13 4.99k
SCLK
C52 0.1uF
R21 200k
R36 200k
SDI SDO
WP
R14 4.99k
C55 0.1uF
CS
C54 0.1uF
R35 100
R12
4.99k
R15
OPT
J23
HD2X7-079-MOLEX
MOSI/SDA 7
EESDA 9
V+ 1
5V 2
CS 6
SCK/SCL 4
EEVCC 10
MISO 5
EESCL 11
EEGND 12
AUX 14
GND
3
GND
13
GND
8
GND DIR VCC(A) VCC(B)
U5
74LVC1T45GW
1 6
43 52
EEPROM
ARRAY
U2
24LC025-I /ST
SDA
5
VCC 8
A0
1A1 2A2 3
GND
4
WP
7
SCL
6
Note: The buffers shown on sheet 2 of 2 of the schematic are used to protect the LTC6953 when connected to the DC2026 before the LTC6953 is powered up. There is no need for such circuitry if the SPI bus is not active before powering up the LTC6953. The EEPROM is for identification and is not needed to program the LTC6953.

11
dc2610af
DEMO MANUAL DC2610A
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.
LAYOUT TOP LAYER

12
dc2610af
DEMO MANUAL DC2610A
 LINEAR TECHNOLOGY CORPORATION 2017
LT 1017 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
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. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation