Linear DC1685A Guía de configuración rápida

dc1685af

DEMO MANUAL DC1685A

Description

LTC6417

LTC6417 and LTC2209

Combo Board

Demonstration circuit 1685A features the LT C

6417, a

1.6GHzdifferentialADCbufferdrivingtheLTC2209,a16-bit

160Msps ADC. The DC1685B is supplied with a bandpass

filter centered at 140MHz between the buffer and ADC.

The filter center frequency can be changed to optimize

performance at different analog input frequencies. Both

single-ended and differentialconfigurations are supported

Quick start proceDure

at the inputs. The DC1685A has been developed from the

DC1281A, used to characterize LTC2209 family of ADCs.

Use the DC1685A with a DC890 FastDAACS and PScope™

Software to collect time and frequency data.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1685A

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PScope

is a trademark of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

DC1685A is easy to set up. Refer to Figure 1 for proper

measurement equipment setup and follow the procedure

below:

1. Apply power to the DC1685A 3.3V across the pins

markedVCC andPWR_GND and 5VacrossAMP_POWER

and PWR_GND. The DC1685A requires up to 800mA

from the VCC, and 200mA from the AMP_POWER.

2.Supply power to the DC890B fast DAACS board with an

external 6V±0.5V, 1A on turrets G7(+) and G1(–) or the

adjacent 2.1mm power jack. Unless the DC890Bdetects

external power, it will not activate the LVDS mode of the

Xilinx Spartan-III FPGA. The FPGA actively terminates

the LVDS repeaters at the outputs of the LTC2209.

3. Connect encode clock to the DC1685A on the SMA

connector marked (J3) Encode Clock. This transformer

coupled input is terminated with a 100Ω at the ADC

clock inputs. For best noise performance the clock input

must be driven with a very low jitter source. When us-

ing a sinusoidal generator, the amplitude should be as

large as possible, up to 13dBm. Using bandpass filters

on the clock and analog inputs will improve the noise

performance by reducing the wideband noise power of

the signals. Data sheet FFT plots are taken with 10 pole

LC filters made by TTE (Los Angeles, CA) to suppress

signal generator harmonics, non-harmonically related

spurs and broadband noise. Low phase noise (jitter)

Agilent 8644B generators are used with the TTE band-

pass filters for the clock and analog input.

4. Connect the analog input to the DC1685A to the SMA

connector marked (J6) IN+ at 140MHz. This input is

capacitivelycoupledtoa1:4baluntransformerWBC4-11.

5. Start and configure PScope data collection software for

the FastDAACS (DC890) by selecting AutoConfigure.

If the board is not detected, update PScope for latest

software and device list, and then select LTC2209 from

the Configure →Device menu. You can also manually

configure PScope for the LTC2209 by setting the pa-

rameters listed in Table 1.

6. Collect data by clicking on the Collect button. Time and

frequency plots will be displayed in the PScope window.

Consult the DC890B Quick Start Guide for more details.

This procedure contains only one critical sequence.

The user must apply supply voltage before applying

signal power to the analog and clock inputs or forc-

ing a voltage to any other turrets. The user must also

remove the signal to the analog and clock inputs and

voltages on any other turret before turning down the

supply voltage.

dc1685af

DEMO MANUAL DC1685A

Quick start proceDure

Table2summarizesthefunction of each SMA connector and

jumper on the board and their suggested default settings.

Table 1. PScope User Configuration for LTC2209.

USER CONFIGURE

Bits 16

Channels 1

Alignment 16

FPGA Ld LVDS

Bipolar [x]

Positive Edge Clk [x]

Table 2. DC1685A Connector and Jumpers

CONNECTOR/

JUMPER FUNCTION

J2 (MODE) ADC Output Format and Clock Duty Stabilizer CDS.

Default to VCC for twos complement and CDS off.

J3 (SHDN) ADC Power Shutdown. Default to RUN.

J3 (DITH) ADC Internal Dither Enable. Default to OFF to disable

internal dither.

J4 (PGA) ADC Programmable Gain Amplifier. Default to 1×

gain mode.

J5 (IN–) Differential Input. Not connected by default. Install

capacitor C9 to drive the input differentially.

J6 (IN+) Differential Input. Connected to input balun for

single-ended operation. Drive from a 50Ω signal

source. No external termination needed.

J7 (ENCODE

CLOCK)

Single-Ended Input. Drive with a 13dBm low jitter

50Ω source.

J11 (OR) Overrange Output. Connect to an oscilloscope input.

Buffer ADC Interface

The LTC6417 has been specifically designed to interface

directly with high speed A/D converters. In Figure 2, the

differential LTC6417 outputs are bandpass filtered to drive

the differential inputs of the LTC2209. Such a filter sup-

presses harmonics and limits the wideband noise of the

amplifier to achieve the best SFDR and SNR. Table 3 lists

componentvalues suggested for bandpass filters optimized

for various input frequencies. The 1:4 transformer at the

inputofthe LTC6417 performs asingle-endedto differential

conversion and provides 6dB voltage gain.

For more detail on the LTC6417 and LTC2209, consult

the data sheets.

Table 3. Bandpass Filter Component Values for Various Input

Frequencies

INPUT FREQUENCIES

COMPONENTS 70MHz 140MHz 270MHz 380MHz

R12 = R36 [Ω] 60.4 60.4 60.4 60.4

C43 = C44 [pF] 56 27 15 12

E1 = E2 [nH] 100 51 27 18

C41 [pF] 47 12 12 10

C10 = C40 [pF] 13 12 33 2.7

E5 [nH] 100 51 27 18

R42 = R43 [Ω] 300 300 300 300

R53 [Ω] 120 120 120 120

C45 = C46 [pF] 39 18 10 8.2

E3 = E4 [nH] 150 75 39 27

dc1685af

DEMO MANUAL DC1685A

Figure 1. DC1685A Layout

pcB Layout

dc1685af

DEMO MANUAL DC1685A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 3 B1, B4, B5 Ferrite Bead, SMT 1206 MURATA, BLM31PG330SN1L

2 3 C1, C2, C3 Cap., X7R 0.01µF 100V 10% 0603 AVX, 06031C103KAT2A

3 1 C4 Cap., NPO 8.2pF 50V 0.25pF 0402 AVX, 04025A8R2CAT2A

4 26 C5, C7, C8, C11, C12, C15, C16, C20–C23,

C25–C37, C39, C42

Cap., X5R 0.1µF 10V 10% 0402 AVX, 0402ZD104KAT2A

5 3 C6, C9, C48 Cap., X7R 0.1µF 25V 10% 0603 AVX, 06033C104KAT2A

6 3 C10, C40, C41 Cap., X7R 12pF 25V 10% 0402 AVX, 04023C120KAT2A

7 2 C13, C17 Cap., X5R 2.2µF 10V 20% 0603 AVX, 0603ZD225MAT2A

8 3 C14, C24, C38 Cap., X5R 4.7µF 10V 20% 0805 AVX, 0805ZD475MAT2A

9 0 C18, C19 (OPT) Cap., 0402, OPT

11 2 C43, C44 Cap., NPO 27pF 25V 10% 0402 AVX, 04023A270KAT2A

12 2 C45, C46 Cap., NPO 18pF 25V 10% 0402 AVX, 04023A180KAT2A

13 0 C47, C49 (OPT) Cap., 0603 OPT

14 3 E1, E2, E5 Ceramic Chip Inductor, 51nH, 0603 Coilcraft, 0603HP_51NXGLU

15 2 E3, E4 Ceramic Chip Inductor, 75nH, 0603 Coilcraft, 0603HP_75NXGLU

17 4 J2, J3, J4, J9 Headers, Dbl. Row 2 × 3 2mm Ctrs. Samtec, TMM-103-02-L-D

18 5 XJ2, XJ3_3-5, XJ3_4-6, XJ4_3-5, XJ4_4-6 Shunt, 2mm Ctrs. Samtec, 2SN-BK-G

19 4 J5, J6, J7, J11 Conn., SMA 50Ω EMERSON, 142-0701-851

20 0 J10 EDGE-CON-100

21 4 R1, R2, R9, R10 Res., Chip 49.9Ω 0.06W 1% 0402 YAGEO, RC0402FR-0749R9L

22 0 R3 (OPT) Res., 0603 OPT

23 2 R4, R5 Res., Chip 5.11Ω 0.06W 1% 0402 VISHAY, CRCW04025R11FKED

24 3 R6, R7, R8 Res., Chip 1.00k 0.06W 1% 0603 YAGEO, RC0603FR-071KL

25 5 R11, R44, R45, R55, R56 Res., Chip 0Ω 0402 VISHAY, CRCW04020000Z0ED

26 1 R12 Res., Chip 82Ω 0.06W 1% 0402 Vishay, CRCW040282R0FKED

27 19 R13, R16–R23, R30–R35, R38–R41 Res., Chip 100Ω 0.05W 5% 0201 YAGEO, RC0201JR-07100RL

28 1 R14 Res., Chip 1.00k 0.06W 1% 0402 YAGEO, RC0402FR-071KL

29 1 R15 Res., Chip 100Ω 0.06W 5% 0402 VISHAY, CRCW0402100RFKED

30 1 R24 Res., Chip 100k 0.06W 5% 0402 VISHAY, CRCW0402100KJNED

31 3 R25, R26, R29 Res., Chip 4.99k 0.06W 1% 0402 VISHAY, CRCW04024K99FKED

32 2 R27, R28 Res., Chip 10Ω 0.05W 5% 0201 VISHAY, CRCW020110R0JNED

33 1 R36 Res., Chip 60.4Ω 0.06W 1% 0402 VISHAY, CRCW040260R4FKED

34 1 R37 Res., Chip 100Ω 0.06W 1% 0603 Vishay, CRCW0603100RFKEA

35 2 R42,R43 Res., Chip 300Ω 0.06W 5% 0402 NIC, NRC04F3000TRF

36 0 R49 (OPT) Res., 0402 OPT

37 1 R53 Res., Chip 120Ω 0.06W 5% 0402 YAGEO, RC0402JR-07120RL

38 6 TP1, TP2, TP4, TP5, TP6, TP7 Turret, Testpoint Mill Max, 2308-2-00-80-00-00-07-0

39 1 T2 XFMR 1 : 4 COILCRAFT, WBC4-14LB

40 1 T3 XFMR MACOM/SM-22 M/A-COM, MABA-007159-000000

dc1685af

DEMO MANUAL DC1685A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

41 1 U1 I.C., Serial EEPROM TSSOP-8 MICROCHIP, 24LC025-I/ST

42 1 U2 I.C., 16-Bit, 160Msps ADC QFN(64) (UP)

9mm × 9mm

Linear Tech., LTC2209CUP#PBF

43 2 U3, U4 I.C., LVDS 8-Port, Hi speed Repeater

TSSOP48 6.1mm Wide

FAIRCHILD, FIN1108MTD

44 1 U5 I.C. BUFFER-LVDS-SINGLE US8 FAIRCHILD, FIN1101K8X

45 1 U6 I.C., ADC Buffer QFN(20) (UDC)

3mm × 4mm

Linear Tech., LTC6417CUDC#PBF

46 4 MTGS at 4 Corners STANDOFF, NYLON .5 1/2" KEYSTONE, 8833(SNAP-ON)

dc1685af

DEMO MANUAL DC1685A

Figure 2a. DC1685A Demo Circuit Schematic

schematic Diagram

D D

C C

B B

A A

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TECHNOLOGY

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 









TECHNOLOGY





























































 

 









TECHNOLOGY

























































































 









 









































 

















































 











































































































































 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 







 















































































































































 





 





























  



 

















































































 

 

 

 







































































































































































































 















































































 



























  









 

 

 

 

 

 





 

































 

 

 





 























 

 







 

































 

































































































































































 



















dc1685af

DEMO MANUAL DC1685A

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

Figure 2b. DC1685A Demo Circuit Schematic

E E

D D

C C

B B

A A



































































































 

 









TECHNOLOGY





























































 

 









TECHNOLOGY





























































 

 









TECHNOLOGY





















































































 













































 

















































 

 





 

 

 

 

 

 





 





 

 

 

 

 

 

 

 





 

 

























































































































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dc1685af

DEMO MANUAL DC1685A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2014

LT 0314 • 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:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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