1
dc1216f
DEMO MANUAL DC1216
Description
High Speed ADC
Clock Source
Demonstration circuit 1216 is a low jitter, low noise clock
source for demonstrating high speed ADCs. Each assem-
bly includes a LDO regulator and a high precision VCXO.
Functionally, this circuit uses a linear regulator to provide
a clean 5V to a VCXO at a fixed frequency. This VCXO is
capable of providing a signal which is clean enough to
produce data sheet performance from high speed ADCs.
It is designed to have 50Ω output impedance, but has
provision for other termination resistors if needed.
Table 1. DC1216A Variants
DC1216A VARIANTS VCXO PART NUMBER OUTPUT FREQUENCY
DC1216A-A Crystek 601964 100MHz
DC1216A-B Crystek 602017 122.88MHz
DC1216A-C Crystek 602019 80MHz
DC1216A-D Crystek 601964 100MHz
Note: DC1216A-A, DC1216A-B and DC1216A-C are optimized to be used
with the data converter demo boards. The DC1216A-D is optimized to
drive the synthesizer demo boards.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
This circuit also is a model for the clock source of ADCs.
It shows how to properly implement a VCXO correctly to
drive the clock of an ADC. It can be used with a DC1075
to produce lower clock frequencies.
Design files for this circuit board are available at
http://www.linear.com/demo
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dc1216f
DEMO MANUAL DC1216
Quick start proceDure
SETUP
The DC1216 requires an external voltage of 5V. This volt-
age can be as high as 9V. The SMA connector should be
connected to the ADC directly, or through a clock divider
circuit such as the DC1075A. No external filter is required.
CONNECT SMA DIRECTLY TO HIGH
SPEED ADC DEMO BOARD
OUTPUT FREQUENCY
DEPENDENT ON CRYSTAL FREQUENCY
5V TO 9V
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dc1216f
DEMO MANUAL DC1216
parts List
DEMO BOARD 1216A
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 1 B1 BEAD, 47Ω IMPEDANCE 0603 MURATA, BLM18BB470SN1D
2 1 C1 CAP, TANT, 100µF, 10V, 20% 6032 AVX, TPSC107M010R0200
3 1 C2 CAP, X5R, 1µF, 10V, 10% 0603 AVX, 0603ZD105KAT2A
4 1 C4 CAP, X7R, 0.1µF, 25V, 10% 0603 AVX, 06033C104KAT2A
5 2 C6, C5 CAP, X7R, 0.01µF, 50V, 10% 0603 AVX, 06035C103KAT2A
6 2 E3, E5 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
7 0 E1, E2, E4 (OPT) TESTPOINT, TURRET, 0.094"
8 1 J1 CON, SMA-EDGE, 50Ω, PLUG AMPHENOL, 901-9895-RFX
9 1 J2 AUX POWER CONNECTOR, B03B-PASK JST, B03B-PASK (LF)(SN)
10 2 R1, R2 RES, CHIP, 4.99k, 1/10W, 1% 0603 VISHAY, CRCW06034K99FKEA
11 0 R3, R5 (OPT) RES, 0603
12 1 R6 RES, CHIP, 1k, 1/10W, 5% 0603 VISHAY, CRCW06031K00JNEA
13 1 U1 IC LT1761ES5-3.3, SOT23-S5 LINEAR TECHNOLOGY, LT1761ES5-3.3#PBF
14 4 (STAND-OFF) STAND-OFF, NYLON 0.25" KEYSTONE, 8831(SNAP ON)
15 1 STENCIL STENCIL 1216A
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dc1216f
DEMO MANUAL DC1216
parts List
DEMO BOARD 1216-A
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 1 DC1216A DC1216A GENERAL BOM GENERAL BOM
2 1 Y1 CRYSTAL 601964 CRYSTEK, 601964
3 1 R4 RES, CHIP, 5.1Ω, 1/10W, 5% 0603 VISHAY, CRCW06035R10JNEA
4 0 C3 OPT
5 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1216A
DEMO BOARD 1216-C
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 1 DC1216A DC1216A GENERAL BOM GENERAL BOM
2 1 Y1 CRYSTAL, 602019 CRYSTEK, 602019
3 1 R4 RES, CHIP, 5.1Ω, 1/10W, 5% 0603 VISHAY, CRCW06035R10JNEA
4 0 C3 OPT
5 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1216A
DEMO BOARD 1216-D
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 1 DC1216A DC1216A GENERAL BOM GENERAL BOM
2 1 C3 CAP, X5R, 4.7µF, 10V, 10% 0603 TDK, C1608X5R1A475K
3 1 R4 RES, CHIP, 100Ω, 1/10W, 5% 0603 VISHAY, CRCW0603100RJNEA
4 1 Y1 CRYSTAL, 601964 CRYSTEK, 601964
5 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1216A
DEMO BOARD 1216-B
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 1 DC1216A DC1216A GENERAL BOM GENERAL BOM
2 1 Y1 CRYSTAL 602017 CRYSTEK, 602017
3 1 R4 RES, CHIP, 5.1Ω, 1/10W, 5% 0603 VISHAY, CRCW06035R10JNEA
4 0 C3 OPT
5 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1216A
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dc1216f
DEMO MANUAL DC1216
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.
schematic Diagram
VREF
GND
CLKOUT
5V
GND
SHDN
VIN
(opt.)
(opt.)
(opt.)
*
DC1216A-A
ASSEMBLY TYPE Y1
Crystek, 601964
Freq. (MHz)
AUX PWR
100MHz
*
VERSION TABLE
CLKOUT
*
122.88MHzDC1216A-B Crystek, 602017
80MHzDC1216A-C Crystek, 602019
100MHz, PLL Reference
R4 C3
5 ohms
5 ohms
5 ohms
OPT
OPT
OPT
Crystek, 601964
DC1216A-D 100 ohms 4.7uF
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN
CHECKED
APPROVED
ENGINEER
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
A1
DC1216A
Wednesday, October 03, 2012
11
June Wu 1/17/07
Clarence Mayott 1/17/07
High Speed ADC Clock Source
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN
CHECKED
APPROVED
ENGINEER
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
A1
DC1216A
Wednesday, October 03, 2012
11
June Wu 1/17/07
Clarence Mayott 1/17/07
High Speed ADC Clock Source
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN
CHECKED
APPROVED
ENGINEER
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
A1
DC1216A
Wednesday, October 03, 2012
11
June Wu 1/17/07
Clarence Mayott 1/17/07
High Speed ADC Clock Source
REVISION HISTORY
DESCRIPTION DATE
APPROVED
ECO REV
MICHEL A.ADD "-D" VERSIONA1 10-03-12
REVISION HISTORY
DESCRIPTION DATE
APPROVED
ECO REV
MICHEL A.ADD "-D" VERSIONA1 10-03-12
REVISION HISTORY
DESCRIPTION DATE
APPROVED
ECO REV
MICHEL A.ADD "-D" VERSIONA1 10-03-12
E4E4
C2
1uF
C2
1uF
R1
4.99K
R1
4.99K
Y1Y1
Volt Cont. 1
Vdd
4
OUT 3
GND
2
C3
*
C3
*
J1J1
E1E1
U1
LT1761ES5-3.3
U1
LT1761ES5-3.3
IN
1
SHDN
3
GND
2
BYP 4
OUT 5
R2
4.99K
R2
4.99K
B1
BEAD 47ohm
B1
BEAD 47ohm R4
*
R4
*
C6
0.01uF
C6
0.01uF
E3E3
E2E2
R3
opt.
R3
opt.
C4
0.1uF
C4
0.1uF
E5E5
+C1
100uF
10V
+C1
100uF
10V
B03B-PASK
J2
B03B-PASK
J2
3
2
1
C5
0.01uF
C5
0.01uF
R6
1K
R6
1K
R5
opt.
R5
opt.
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dc1216f
DEMO MANUAL DC1216
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2013
LT 0313 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LT C 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 LT C applica-
tion engineer.
Mailing Address:
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1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
