Linear Technology DC1760A Quick setup guide

dc1760af

DEMO MANUAL DC1760A

DESCRIPTION

LTC2261-14 and LTC6409

12-/14-Bit, 25Msps to 150Msps

ADC Combo Board

Demonstration circuit 1760A supports a family of 14-

/12-bit 25Msps to 150Msps ADCs and an LTC

6409 low

noise amplifier. Each assembly features a device from the

LTC2261-14 family of high dynamic range 1.8V ADCs and

a LTC6409 low noise amplifier.

Demonstration circuit 1760A supports the LTC2261-14

family full rate CMOS and DDR CMOS output mode. The

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

and QuikEval are trademarks of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

PERFORMANCE SUMMARY

(TA= 25°C)

circuitry on the analog inputs is optimized for analog input

frequencies from DC to 100MHz. Refer to the data sheet

for proper input networks for different input frequencies.

Design files for this circuit board are available at

http://www.linear.com/demo

PARAMETER CONDITION VALUE

Supply Voltage—ADC Depending on Sampling Rate and the A/D

Converter Provided, This Supply Must Provide Up

to 150mA

Optimized for 3.3V [3.0V ⇔3.5V Min/Max]

Supply Voltage—Amplifier Depending on Supply Voltage Used, This Supply

Must Provide Up to 25mA

Optimized for 3.0V [2.7V ⇔5.0V Min/Max]

Analog Input Range Depending On Sense Pin Voltage 1VP-P to 2VP-P

Logic Input Voltages Minimum Logic High 1.3V

Maximum Logic Low 0.6V

Logic Output Voltages (OVDD = 1.8V) Minimum High Level Output Voltage 1.750V (1.790V Typical)

Maximum Low Level Output Voltage 0.050V (0.010V Typical)

Sampling Frequency (Convert Clock Frequency) Depending on ADC This Can Vary Between

20Msps and 125Msps

LTC2261-14 = 125Msps

Convert Clock Level Single-Ended Encode Mode (ENC–Tied To Gnd) 0V to 3.6V

Convert Clock Level Differential Encode Mode (ENC–Not Tied to GND) 0.2V to 3.6V

Resolution 14 Bits

Input Frequency Range DC-100MHz

SFDR See Applicable Data Sheet

SNR See Applicable Data Sheet

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DEMO MANUAL DC1760A

QUICK START PROCEDURE

Figure 1. DC1760 Setup (Zoom for Detail)

Demonstration circuit 1760A is easy to set up to evaluate

the performance of the LTC2261-14 family of A/D convert-

ers. Refer to Figure 1 for proper measurement equipment

setup and follow the procedure below:

Setup

If a DC890 QuikEval™-II data acquisition and collection

system was supplied with the DC1760A demonstration

circuit, follow the DC890 Quick Start Guide to install the

required software and for connecting the DC890 to the

DC1760A and to a PC.

DC1760A Demonstration Circuit Board Jumpers

The DC1760A demonstration circuit board should have

the following jumper settings as default positions: (as

per Figure 1).

+–

3.3V

2.7V TO 5V

SINGLE-ENDED

INPUT SIGNAL

JUMPERS ARE SHOWN

IN DEFAULT POSITIONS

PARALLEL DATA

OUTPUT TO DC890

SINGLE-ENDED

ENCODE CLOCK

–

MATCHED

SOURCE

IMPEDANCE

PAR/SER: Selects parallel or serial programming mode

(Default: Serial).

DutyCycleStabilizer(DCS):Inparallelprogrammingmode

enables/disable Duty Cycle Stabilizer (Default: Enable).

SHDN: In parallel programming modeenables and disables

the LTC2261-14 (Default: Enable).

LVDS: In parallel programming mode selects between

CMOS and LVDS outputs. (Default: LVDS, required for

serial programming mode. When using parallel mode the

required setting is CMOS).

AMP_SHDN: Enables and disables the LTC6409. (Default:

Enable)

dc1760af

DEMO MANUAL DC1760A

QUICK START PROCEDURE

Applying Power and Signals To The FT996

Demonstration Circuit

If a DC890 is used to acquire data from the DC1760A, the

DC890 must first be connected to a powered USB port

or provided an external 6V to 9V before applying 3.0V to

6.0V across the pins marked +3.3V and GND, or 2.7V to

3.5V on the V_AMP pin on the DC1760A. The DC1760A

requires 3.3V on the ADC input for proper operation,

regulators on the board produce the voltages required

for the ADC. The voltage applied to the amplifier is not

regulated. The DC1760A demonstration circuit requires

up to 150mA on the ADC input depending on the sampling

rate and the A/D converter supplied, and up to 25mA on

the amplifier power input.

The DC890 data collection board is powered by the USB

cable and does not require an external power supply unless

it must be connected to the PC through an unpowered hub

in which case it must be supplied an external 6V to 9V on

turrets G7(+) and G1(–) or the adjacent 2.1mm power jack.

Analog Input Network

The DC1760A can be driven from a differential or single-

ended source. If the DC1760A is driven from asingle-ended

source applied to the AIN+ connector (J8), the equivalent

impedance characteristic should be seen on the AIN–

connector (J9). If there is a difference in the impedance

characteristic between the two input ports common mode

noise sources in the amplifier will translate to differential

mode noise and will raise the noise floor.

For optimal distortion and noise performance the filter

network can be optimized for different analog input fre-

quencies. Refer to the LTC6409 data sheet for information

on setting the gain and input impedance of the LTC6409.

In almost all cases, filters will be required on both analog

input and encode clock to produce maximum SNR. In the

case of the DC1760A the bandpass filter used for the clock

should be used prior to the DC1075A clock divide board.

The filters should be located close to the inputs to avoid

reflections from impedance discontinuities at the driven

end of a long transmission line. Most filters do not present

50Ω outside the passband. In some cases, 3dB to 10dB

pads may be required to obtain low distortion.

Encode Clock

Note: Apply an encode clock to the SMA connector on

the DC1760A demonstration circuit board marked J7.

As a default the DC1760A is populated to have a single-

ended input.

For the best noise performance, the encode input must

be driven with a very low jitter, square wave source. The

amplitude should be large, up to 3VP-P or 13dBm. When

using a sinusoidal signal generator a squaring circuit can

be used. Linear Technology also provides demo board

DC1075A that divides a high frequency sine wave by four,

producing a low jitter square wave for best results with

the LTC2261-14 ADC family.

Using bandpass filters on the clock and the analog input

will improve the noise performance by reducing the

wideband noise power of the signals. In the case of the

DC1760A a bandpass filter used for the clock should be

used prior to the DC1075A. 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 spursand broadband noise.Low phasenoise Agilent

8644B generators are used with TTE bandpass filters for

both the clock input and the analog input.

Applythe analog input signal of interest to the SMA connec-

tors on the DC1760A demonstration circuit board marked

J5 and J3. This combo board is currently populated to

receive a differential signal.

An internally generated conversion clockoutput is available

on J1 which could be collected via a logic analyzer, or other

data collection system if populated with a SAMTEC MEC8-

150 type connector or collected by the DC890 QuikEval-II

Data Acquisition Board using PScope™ software.

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DEMO MANUAL DC1760A

QUICK START PROCEDURE

Figure 2. ADC Configuration

Software

The DC890 is controlled by the PScope system software

provided or downloaded from the Linear Technology

website at http://www.linear.com/software/. If a DC890

was provided, follow the DC890 Quick Start Guide and

the instructions below.

To start the data collection software if PScope.exe, is in-

stalled (by default) in \Program Files\LTC\PScope\, double

click the PScope icon or bring up the run window under

the start menu and browse to the PScope directory and

select PScope.

If the DC1760Ademonstration circuit is properly connected

to the DC890, PScope should automatically detect the

DC1760A, and configure itself accordingly. If necessary

the procedure below explains how to manually configure

PScope.

UndertheConfiguremenu, go to ADC Configuration.Check

the Config Manually box and use the following configura-

tion options, see Figure 2:

Figure 3: PScope Toolbar

Manual configuration settings:

Bits: 14

Alignment: 14

FPGA Ld: CMOS

Channs: 2

Bipolar: Un-checked

Positive-Edge Clk: Checked

If everything is hooked up properly, powered and a suit-

able convert clock is present, clicking the Collect button

should result in time and frequency plots displayed in

the PScope window. Additional information and help for

PScope is available in the DC890 Quick Start Guide and in

the online help available within the PScope program itself.

Serial Programming

PScope has the ability to program the DC1760A board

serially through the DC890. There are several options

available in the LTC2261-14 family that are only available

through serially programming. PScope allows all of these

features to be tested.

These options are available by first clicking on the “Set

Demo Bd Options” icon on the PScope toolbar (Figure 3).

This will bring up the menu shown in Figure 4.

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DEMO MANUAL DC1760A

QUICK START PROCEDURE

Figure 4: Demobd Configuration Options.

This menu allows any of the options available for the

LTC2261-14 family to be programmed serially. The

LTC2261-14 family has the following options:

Power Control: Selects between normal operation, nap

and sleep modes.

• Normal (Default) – Entire ADC is powered, and active.

• Nap – ADC core powers down while references stay

active.

• Shutdown – The entire ADC is powered down.

Clock Inversion: Selects the polarity of the CLKOUT signal:

• Normal (Default) – Normal CLKOUT polarity

• Inverted – CLKOUT polarity is inverted

Clock Delay: Selectsthephasedelay of the CLKOUT signal:

• None (Default) – No CLKOUT delay

• 45° – CLKOUT delayed by 45°

• 90° – CLKOUT delayed by 90°

• 135° – CLKOUT delayed by 135°

Clock Duty Cycle: EnablesordisablesDutyCycle Stabilizer.

• Stabilizer off (Default) – Duty Cycle Stabilizer disabled

• Stabilizer on – Duty Cycle Stabilizer enabled

Output Current: Selects the LVDS output drive current.

This option is not used on the FT1370.

• 1.75mA (Default) - LVDS output driver current

• 2.1mA - LVDS output driver current

• 2.5mA - LVDS output driver current

• 3.0mA - LVDS output driver current

• 3.5mA - LVDS output driver current

• 4.0mA - LVDS output driver current

• 4.5mA - LVDS output driver current

Internal Termination: Enables LVDS internal termination

This option is not used on the FT1370.

• Off (Default) – Disables internal termination

• On – Enables internal termination

Outputs: Enables Digital Outputs.

• Enabled (Default) – Enables digital outputs

• Disabled – Disables digital outputs

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DEMO MANUAL DC1760A

Output Mode: Selects Digital output mode.

• Full Rate (Default) – Full rate CMOS output mode (This

mode is not supported by the DC1760A).

• Double LVDS – double data rate LVDS output mode

• Double CMOS – double data rate CMOS output mode

(This mode is not supported by the DC1760A).

Test Pattern: Selects Digital output test patterns.

• Off (Default) – ADC data presented at output

• All out =1 – All digital outputs are 1

• All out = 0 – All digital outputs are 0

• Checkerboard - OF, and D13-D0 Alternate between 101

0101 1010 0101 and 010 1010 0101 1010 on alternat-

ing samples.

• Alternating – Digital outputs alternate between all 1’s

and all 0’s on alternating samples.

Alternate Bit: Alternate Bit Polarity (ABP) mode.

• Off (Default) – Disables alternate bit polarity

• On – Enables alternate bit polarity (Before enabling ABP,

be sure the part is in offset binary mode)

Randomizer: Enables Data Output Randomizer.

• Off (Default) – Disables data output randomizer

• On – Enables data output randomizer

Two’s Complement: Enables two’s complement mode.

• Off (Default) – Selects offset binary mode

• On – Selects two’s complement mode

Once the desired settings are selected hit OK and PScope

will automatically update the register of the device on the

DC1760A demo board.

QUICK START PROCEDURE

dc1760af

DEMO MANUAL DC1760A

PARTS LIST

ITEM QTY

REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

C1, C56 CAP., 0603 2.2μF 6.3V 20% X5R AVX, 06036D255MAT2A

C11, C12, C15 CAP., 0402 1000pF 5% 50V COG MURATA, GRM1555C1H102JA01

C13, C14, C33, C37, C39, C40 CAP., 0402 1μF 10V 10% X5R AVX, 0402ZD105KAT2A

C16, C20 CAP., Tant., 100μF, 10V, 20% 6032 AVX, TAJW107M010R

C17 CAP., 0805 2.2μF 10V 20% X5R AVX, 0805ZD225MAT

C18, C45, C46, C47, C48 CAP., 0402 OPT

C2, C5 CAP., 0201 0.8pF 25V ±0.1pF NP0 AVX, 02013A0R8BAT2A

819

C3, C4, C6-C10, C21,C25-C27, C32,

C34-C36, C41, C43, C44, C57

CAP., 0402 0.1μF 10V 10% X5R AVX, 0402ZD104KAT

C42 CAP., 0402 TBD

10 1

J10 HEADER, 3-PIN 0.079 SINGLE ROW SAMTEC, TMM-103-02-L-S

11 2

J2, J4 HEADER, 2 ×3 PIN 0.079 DOUBLE ROW SAMTEC, TMM-103-02-L-D

12 3

J7, J8, J9 CONN., SMA 50Ω EDGE-LANCH CONNEX, 132357 / 142-0701-851

13 1

L1 IND., BEAD, 60Ω Impedance 0805 MURATA, BLM21BB600SN1D

14 5

R1, R5, R6, R7, R8 RES., ARRAY, 33Ω 0402 5% VISHAY, CRA04S08333R0JTD

15 0

R10, R11, R42, R46, R47, R52, R53 RES., 0402 TBD

16 1

R15 RES., 0402 100Ω 1% 1/16W VISHAY, CRCW0402100RFKED

17 1

R16 RES., 0201 100Ω 1% 1/20W VISHAY, CRCW0201100RFNED

18 1

R17 RES., 0402 10Ω 1% 1/16W VISHAY, CRCW040210R0FKED

19 0

R18, R19, R20 RES., 0402 OPT

20 1

R2 RES., 0402 10k 1% 1/16W VISHAY, CRCW040210K0FKED

21 1

R24 RES., 0402 100k 1% 1/16W VISHAY, CRCW0402100KFKED

22 3

R25, R26, R29 RES., 0402 4.99k 1% 1/16W VISHAY, CRCW04024K99FKED

23 2

R3, R31 RES., 0402 180k 1% 1/16W 5%? VISHAY, CRCW0402180KFKED

24 2

R39, R40 RES., 0201 10Ω 5% 1/20W VISHAY, CRCW020110R0JNED

25 5

R4, R14, R32, R33, R35 REA., 0603 1k 5% 1/16W VISHAY, CRCW06031K00FKEA

26 1

R43 RES., 0402 66.5Ω 1% 1/16W VISHAY, CRCW040266R5FKED

27 2

R49, R54 RES., 0402 30.1Ω 1% 1/16W VISHAY, CRCW040230R1FKED

28 4

R57, R58, R59, R60 RES., 0402 150Ω 5% 1/16W VISHAY, CRCW0402150RJNED

29 9

R9, R12, R13, R41, R48, R50, R51, R55,

R56

RES., 0402 0Ω JUMPER VISHAY, CRCW04020000Z0ED

30 8

TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 TP, TURRET, 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0

31 1

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

32 1

U10 IC, LT6409 QFN-3MM ×2MM LINEAR, LTC6409CUD#PBF

33 2

U2, U4 IC, LT3080EDD LINEAR, LT3080EDD#PBF

34 2

U3, U5 IC, FXLH42245 DFN-8X4 FAIRCHILD, FXLH42245MPX

35 1

U6 IC, NC7SP17P5X SC70-5 FAIRCHILD, NC7SP17P5X

36 1

U7 IC, PCF8574 SSOP20 PHILLIPS, PCF8574TS

37 1

U9 IC, LTC2262IUJ, TQFN-6 ×6-40PIN LINEAR, LTC2262IUJ-14#PBF

SHUNTS

39 4

MTG1, MTG2, MTG3, MTG4 STAND-OFF, NYLON (SNAP ON), 0.25" TALL KEYSTONE, 8831(SNAP ON)

40 2

STENCILS FOR BOTH SIDES STENCIL DC1760A-1

dc1760af

DEMO MANUAL DC1760A

SCHEMATIC DIAGRAM

dc1760af

DEMO MANUAL DC1760A

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

dc1760af

DEMO MANUAL DC1760A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0411 • 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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