DC1765A - Demo Manual

DEMO MANUAL DC1765A
LTC6957-1/LTC6957-2
Low Phase Noise, Dual LVPECL or LVDS
Output Buffer/Driver/Logic Converter
Description
Demonstration Circuit 1765A features the LTC®6957-1/
LTC6957-2, a low phase noise, dual LVPECL or LVDS
output buffer/driver/logic converter.
The DC1765A provides 0.5" spaced SMA connectors for
the differential inputs and outputs. The inputs are terminated to on-board 50Ω resistors. The LVPECL outputs
of the DC1765A-A are individually biased through 130Ω
resistors to ground and then AC-coupled. The transmission lines are 50Ω, making the outputs suitable to drive
50Ω input impedance instruments. The LVDS outputs
of the DC1765A-B are terminated with 100Ω differential
and are DC-coupled. The DC1765A allows the user to
take advantage of the shutdown and bandwidth selection
features of the LTC6957. The DC1765A can operate with
a single-ended or differential sine wave or square-wave
input signal. Supply the DC1765A with 3.3V and it is
ready to function. The DC1765A offers extra component
population options to make it compatible with different
logic signal types.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
Figure 1. DC1765A Inputs and Outputs
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DEMO MANUAL DC1765A
Quick Start Procedure
The DC1765A is very straightforward to operate. Refer to
Figure 1 for the following discussion.
DC1765A Configuration
1.Apply a low-noise and low-spurious 3.3V supply between
the V+ (E1) and GND (E2) turrets.
2.Connect a low phase-noise (or jitter) single-ended or
differential input signal to IN+ (J1) and/or IN– (J2)
SMA connectors. Refer to the LTC6957 data sheet for
appropriate input signal types and levels.
DC1765A Reconfiguration
The DC1765A is flexible and allows the connectivity of a
variety of input and output signal types. The DC1765A is
configured as shown in the schematic diagram. However,
the DC1765A allows the installation of different input and
output configurations to adapt to a variety of logic signals. Refer to the Applications Information section of the
LTC6957 data sheet for all possible connectivity options
that can be implemented by modifying the DC1765A.
3.Connect either of the outputs (OUT1, J3 and J4 or OUT2,
J5 and J6) to a high-speed scope, spectrum analyzer or
a signal analyzer to start the evaluation of the LTC6957.
4.Configure the input bandwidth of the LTC6957 with the
use of FILTA (JP1) and FILTB (JP2) jumpers. Follow the
instructions given in the LTC6957 data sheet to choose
the correct bandwidth given an input signal.
5.Shut down an unused output by using jumper SD1 (JP3)
to shutdown OUT1 or jumper SD2 (JP4) to shutdown
OUT2.
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DEMO MANUAL DC1765A
Assembly Options
Table 1. DC1765A Assembly Options
ASSEMBLY VERSION
PART NUMBER
OUTPUT TYPE
DC1765A-A
LTC6957HMS-1
LVPECL
DC1765A-B
LTC6957HMS-2
LVDS
Layout Top Layer
The top metal layer of the DC1765A is shown here as an example of good PCB layout for the LTC6957-1/LTC6957-2.
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DEMO MANUAL DC1765A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
C6, C8
CAP., X7R, 0.01µF 50V 10%, 0603
NIC, NMC0603X7R103K50TRP
DC1765A General BOM
1
2
2
1
C13
CAP., X7R, 0.1µF 50V 10%, 0603
TDK, C1608X7R1H104K
3
1
C14
CAP., X5R, 1µF 25V 10%, 0603
TDK, C1608X5R1E105K
4
1
C16
CAP., TANT, 22µF 10V, 3528
AVX, TPSB226K010R0400
5
2
E1, E2
TESTPOINT, TURRET 0.094"
MILLMAX, 2501-2-00-80-00-00-07-0
6
4
JP1, JP2, JP3, JP4
HEADER 1×3 079
SAMTEC, TMM-103-02-L-S
7
6
J1, J2, J3, J4, J5, J6
CONN., SMA 50Ω EDGE-LAUNCH
E.F. JOHNSON, 142-0701-851
8
0
R6, R11, R14
RES., OPT 0603
OPT
9
2
R7, R15
RES., CHIP, 49.9Ω 1% 0603
VISHAY, CRCW060349R9FKEA
10
4
R16, R17, R18, R19
RES., CHIP, 330k 1% 0603
VISHAY, CRCW0603330KFKEA
11
4
SHUNTS FOR JP1-JP4
SHUNT, .079" CENTER
SAMTEC, 2SN-BK-G
12
4
STAND-OFF, NYLON 0.500
KEYSTONE, 8833 (SNAP ON)
1
DC1765A GENERAL BOM
DC1765A
DC1765A-A
1
2
4
Z1, Z2, Z3, Z4
CAP., X7R, 0.01µF 50V, 0603
NIC, NMC0603X7R103K50TRP
3
4
R1, R2, R3, R4
RES., CHIP, 130Ω, 0603
VISHAY, CRCW0603130RFKEA
4
0
R20, R21
RES., 0603
OPT
5
1
U1
IC, LTC6957HMS-1, MS12
LINEAR TECH., LTC6957HMS-1
DC1765A GENERAL BOM
DC1765A
DC1765A-B
1
1
2
4
Z1, Z2, Z3, Z4
RES., CHIP, 0Ω, 0603
VISHAY, CRCW06030000Z0EA
3
0
R1, R2, R3, R4
RES., 0603
OPT
4
2
R20, R21
RES., CHIP, 100Ω 5%, 0603
VISHAY, CRCW0603100RJNEA
5
1
U1
IC, LTC6957HMS-2, MS12
LINEAR TECH., LTC6957HMS-2
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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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
A
B
LVPECL
LVDS
-A
-B
ASSY
SMA-R
J2
SMA-R
U1
R14
OPT
R15
49.9
R7
49.9
LTC6957HMS-2
LTC6957HMS-1
V+
R11
OPT
R6
OPT
L
H
0 OHM
OPT
*
OUT2-
IN-
R18
330k
FILTB
4
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
7
8
9
10
11
12
V+
SCALE = NONE
3
2
1
V+
MICHEL A.
KIM T.
APPROVALS
R19
330k
SD2
OUT2+
OUT1-
GND
OUT1+
IN+
SD1
R17
330k
V+
FILTA
CUSTOMER NOTICE
100 OHM
3
2
1
6
5
4
3
2
1
U1
R16
330k
3
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
0.01uF
JP2
FILTB
V+
V+
GND
E2
FILTA
3
H
2
1
L
JP1
Z1-Z4 R20-R21
C13
0.1uF
C14
1uF
OPT
1. ALL RESISTORS AND CAPACITORS ARE 0603.
5
C16
22uF
3528 10V
130 OHM
R1-R4
C8
0.01uF
C6
0.01uF
NOTE: UNLESS OTHERWISE SPECIFIED
*
IN-
IN+
J1
V+
V+
V+
3.15V - 3.45V
E1
4
+
C
D
5
JP4
L
H
3
DATE:
N/A
SIZE
*
R21
*
R20
*
R4
*
R3
*
R2
*
R1
Z4
Z3
OUT2+
OUT2-
OUT1-
SMA-R
J6
SMA-R
J5
SMA-R
J4
SMA-R
J3
MICHEL A.
APPROVED
1
DATE
OUT2+
OUT2-
OUT1-
OUT1+
08-16-12
2
08/16/2012, 06:45 PM
IC NO.
1
SHEET 1
OF 1
3
REV.
LOW PHASE NOISE, DUAL LVPECL OR LVDS OUTPUT
BUFFER / DRIVER / LOGIC CONVERTER
LTC6957HMS-1 / -2
DEMO CIRCUIT 1765A
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
*
*
Z2 *
Z1 *
OUT1+
DESCRIPTION
PRODUCTION
REVISION HISTORY
TECHNOLOGY
REV
TITLE: SCHEMATIC
3
2
1
L
H
SD2
JP3
SD1
__
ECO
2
A
B
C
D
DEMO MANUAL DC1765A
Schematic Diagram
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DEMO MANUAL DC1765A
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
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Linear Technology Corporation
LT 0213 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2013
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