Linear Technology DC890B Manuale utente

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 890B

FastDAACS

DC890B QuickStart Guide

DESCRIPTION

Demonstration circuit DC890B along with QuickEval-

II™software provides a USB based Windows PC

hosted digital data acquisition system supporting

CMOS/LVDS output ADCs up to 250Msps.The

DC890B must be powered from an external 6±0.5VDC

power supply when operating in LVDS mode. When

operating in CMOS mode, the external power supply is

optional. The Linear Technology supplied QuickEval-

II evaluation software automatically detects the

DC890B and can also detect many of the standard ADC

demonstration circuitsboards. The DC890B will not

enable LVDS mode unless an external 6.0VDC power

source is available. The QuickEval-II system provides

for fast and easy performance evaluation of high speed

ADCs. FastDAACS collectsup to 256K word samples

and then performsvarious analyses on the data includ-

ing calculating SNR, SINAD, THD, SFDR and ENOB.

The digitized input, an FFT of the collected data, the

Primitive Wave of the sample set or an IFFT of modi-

fied frequency domain data is plotted to a display win-

dow to facilitate analyzing distortion products and

sources. Figure 1 shows a picture of the DC890B. The

DC890B is connected to the ADC demonstration circuit

via a 100 pin edge connector, to the PC by a USB A-B

cable and to an optional power supply either by a 5mm

power plug or optionally by turrets.Figure 2 details

the connections.

Figure 1. DC890B FastDAACS Board

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 890B

FastDAACS

OPERATING PRINCIPLES

The DC890B is capable of collecting a block of data

samples from an ADC demonstration circuit initiated

either by an internally generated trigger or an externally

supplied 2.5V CMOS level trigger of user-selected

edge. The external trigger is TTL or CMOS compatible

(the trigger line is diode clamped to the 2.5V Rail

through a 475resistor). Refer to the QuickEval-II

Software Help for information on the various operating

modes and options. The Conversion clock to the

DC890B is supplied via the ADC demonstration circuit

either from an optional on board oscillator if installed

or an external signal generator connected to the ADC

demonstration circuit.

QUICK START PROCEDURE

To prevent damage to the DC890B, it is important to

follow the equipment setup procedure outlined be-

low:

1. Do not plug the DC890B into the PC USB port

before running the installation program

2. Download the QuickEval-II installation program

from http://www.linear.com/software/.

3. Run the QuickEval-II installation program and

follow the on-screen instructions.

NOTE: The QuickEval-II evaluation software

requires a PC running Windows98, 2000, or XP

with an available USB port.

4. Connect the DC890B to the USB port and supply

external power to the DC890B, if you will be us-

ing the LVDS mode.Do not use a USB cable

longer than 2m or the board may not reset prop-

erly. (See note in trouble shooting section.)

5. Connect only 2.5VCMOS or LVDS output ADC

demonstration circuits directly to the DC890B via

the 100 pin edge connector. All Linear Technol-

ogy DC890 compatible demo boards meet these

requirements. Apply DCpower to the ADC dem-

onstration circuit.

6. Each ADC demonstration board also comes with

a Quick Start guide similar to this one and should

be referred to for specific usage details relevant

to the demonstration circuit being evaluated.

Please refer to it for proper jumper settings, input

power requirements and input signal levels and

frequency ranges.

7. Apply an appropriate conversion clock and ana-

log input signal to theADC demonstration board.

8. Open the QuickEval-II software and from the

Configure Menu, select FastDAACS. Then also

from the Configure menu, click on Device and

scroll through the list of Linear Technology Cor-

poration ADCs and select the device part number

on the attached demo board.

9. Select Processing Options (the hammer icon)

menu and verify that under Trigger Mode, No

Trigger Wait is selected

10. Enter the exactsample rate in Mhz and select the

sample size in the provided fields in QuickEval-II

page 1.

11. If the sampled signal is not coherent with the en-

code clock, select an appropriate windowing

function from the pull down menu.

12. Initiate a data collection cycle by clicking the

green Collect button; it will turn red during the

collection cycle. An FFT should appear on the

screen along with aplot of the sampled data.

Make sure the input level is not over ranging the

ADC. See online help for specific guidance on

using the QuickEval-II Software.

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 890B

FastDAACS

Figure 2. DC890B FastDAACS Basic Connection Locations

USEFUL SOFTWARE TOOLS

The QuickEval-II software includes tools for automatic

software updates and for quickly retrieving documenta-

tion from the World Wide Web.

The Download Datasheets feature is particularly useful

to laptop users, who can use this feature to download

the data sheets and Quick Start guides in one step, thus

making them available even when the laptop is not

connected to the Internet.

NOTE: Adobe Acrobat reader is required to view the

documents and is available at http://www.adobe.com.

To update the QuickEval-II software (requires an

internet connection):

Choose “Update Program”from the Tools menu.

This automatically updates the main program and driv-

ers for individual demo circuits.

To view the Quick Start Guide for the DC890B dem-

onstration board:

Choose “View Controller QS Guide”from the View

menu.

To View the Quick Start Guide for the Device:

Choose “View Device QS Guide”from the View

menu. This will bring up the product page in your de-

Demonstration

Circuit Connector

Ext 6VDC

Required for

LVDS. Apply

to tur

ret TP2 &

3 or use or use

a 5mm power-

plug or wall

transformer

USB Connector

Ext Trigger Input JTAG

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 890B

FastDAACS

fault browser. Select documentation for “Reference

Design”.

To download data sheets (requires an internet con-

nection):

Choose “Download Data Sheets”from the Tools

menu.

All datasheets and Quick Start guides for all products in

the QuickEval-II family are downloaded to the

QuickEval-II program folder and placed in the dsheets

folder.

OPTIONAL CONNECTIONS TO THE DC890B

In CMOS mode the DC890B can operate from the

USB power, however in LVDS mode, the Spartan-III

FPGA IO ring drivers draw considerable supply cur-

rent to bias the active LVDS terminations. The

DC890B has provisions for a 5mm power plug for

an external 6V ±0.5V supply. The DC890B auto-

matically detects the presence of external power and

disables the USB power input.

X1: The DC890B has provisions for an external

trigger input, Edge selectable by software. This per-

mits initiating data block capture by an external

event.

J2: A JTAG connector is provided for downloading

custom FPGA software to the board. Grounding pin

3 of J2 automatically puts the FPGA into JTAG pro-

gramming mode.User developed code can be

loaded into the FPGA without compromising the fac-

tory installed code. JUMPER PINS 4 & 6 OF PIC

Programming connector J1 to disable the microcon-

troller when using custom FPGA code. Refer to the

schematic for further details. This feature is pro-

vided due to customer requests. Development of

customcode will not be supported by the factory.

J7 & J8 locations (not installed) provide access to 6

additional FPGA pins for test purposes. These pins

also drive LED indicators useful for debug purposes.

Xilinx provides logic analysis and data collection

features through JTAG via ChipScope.

LED INDICATORS

The DC890B provides system status via 8 LEDs:

LED-1.TRANSFER ûIndicates a USB data transfer

from the QuickEval-II to the PC is in progress.

LED-2.SEEP ûIndicates access of the optional dem-

onstration circuit Serial Electrically Erasable

PROM on select demonstration boards. In-

formation in this SEEP permits QuickEval-II

software to configure the DC890B properly

for the device under evaluation using the auto

detect demo board feature in the Config-

ure/Device Menu.

LED-3.RST ûIndicates assertion of either a hard or

soft reset.

LED-4.DCM_RDYûIn LVDS mode, led 4 blinks to

alert the user that the sample clock is either

not present or outside the required frequency

range (Fin mist be >50 MHz).A steady on

condition indicates the Digital Clock Module

is locked to the input sample clock. In CMOS

mode LED 4 functions as a Power On/FPGA

programmed Indicator.

LED-5.RUN ON TRIGGER ûIndicates that the

board is set to run on trigger (versus halt on

trigger mode).

LED-6.DATA_RDY ûIndicates completion of data

block acquisition.

LED-7.RUN ûIndicates the board is ARMED to col-

lect a block of data.

LED-8.TRIGGER ûindicates that a trigger was re-

ceived and data collection has started.

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 890B

FastDAACS

CIRCUIT DETAILS

A schematic,parts list and parts placement drawings

are attached to the end of this Quick Start Guide for

reference only.

TROUBLE SHOOTING GUIDE

Problem: DC890B is plugged in, but QuickEval-II

software still does not recognize DC890B board.

Solution: Assuming that the USB hardware in your

computer is operational (Try verifying an operational

USB port with another USB device such as a USB

Memory stick, printer or scanner if available.), the

likely cause is improper installation of the USB driv-

ers, which results in Windows recognizing the

DC890B as an “Unknown Device”. If this is the

case, the problem can be corrected by the following

procedure:

1) Unplug the DC890B board from the USB port.

2) Re-install the QuickEval-II Software.

CAREFULLY following the on-screen instruc-

tions. This MAY require a reboot of your com-

puter. The on-screen instructions will inform you

if that is the case.

3) If the problem persists, please choose “Contact

Software Support”from the Tools Menu for as-

sistance from LTC staff.

Problem: Demonstration circuit software loads

properly, but will not run or gives “Device Not Ac-

cessible” errors.

Solution: Verify the demonstration circuit is prop-

erly powered up and a correct (signal level and fre-

quency) conversion clock is applied. (The DC890B

can operate from the USB port power in CMOS

mode but will not load the FPGA with the LVDS

code unless external power is detected.) Set the cor-

rect sample rate for the applied conversion clock as

QuickEval-II software uses the sample size and rate

to determine the watch dog time out period to reset

the DC890B if the USB bus should hang. Refer to

the appropriate demonstration circuit Quick Start

Guide for details.

Problem: Collected data samples look like noise or

appear corrupted.

Solution: Make sure the proper device has been se-

lected in the QuickEval-II software, the factory

jumper settings are present and for LVDS output

demo boards, external power is applied to the

DC890B otherwise the captured data will not be

properly interpreted.

Problem: QuickEval-II reports it cannot reset the

DC890B.

Solution: Make sure either a powered USB port is

used or external power is supplied. DO NOT USE A

USB CABLE LONGER THAN 2 METERS. The

time delay of a longer USB cable may result in the

DC890B intercepting the reset.

Problem: USB Bus appears to be hung.

Solution: As the DC890B is used in a lab environ-

ment where power may be inappropriately se-

quenced, cables unintentionally disconnected etc,

some users have reportedly had their USB bus hang.

This condition is easily rectified by right clicking

properties under my computer -> Hardware -> De-

vice Manager -> and then right clicking on the ap-

propriate USB bus controller and again selecting

properties. The device status generally reportsthat it

is working properly. Select the Advanced tab. You

will notice a refresh button. Device manager has

queried the port and as a result reset the bus.

Downloaded from Elcodis.com electronic components distributor

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 890B

FastDAACS

Item Qty Reference Part Description Manufacturer / Part #

1 3

C80,C81,C89

CAP,TANT,470uF,10V,20%, 7343 AVX TPSE477M010R0050

2 0 C94 (Opt) CAP,TANT,470uF,10V,20%, 7343 AVX TPSE477M010R0050

3 0 C88 (Opt) CAP, POLY-TA, 1000uF, 4V

20%,7343 KEMET T530X108M004ASE006

4 1 C88 CAP, POLY-TA, 680uF, 4V 20%,

7343 KEMET,T520D687M004ASE025

5 1 C36 CAP, 330uF16V 20PCT NICHICON UPL1C331MPH6

6 9 C1,C2,C32,C35,C38,C76,C78,

C79,C92 CAP, X5R 10uF 6.3V 20% 1206 TAIYO YUDEN JMK316BJ106ML-T

7 1 C82 CAP,TANT,4.7uF,10V,20%,3216 AVX TAJA475M010R

8 5 C8,C37,C60,C77,C91 CAP, X7R 1uF 10V 10% 0603 AVX, 0603ZD105KAT

9 1 C83 CAP, X5R 0.22uF 16V 20% 0603 AVX, 0603YD224MAT

10 15 C11,C12,C27-31,C34,C42,C44,

C52,C53,C57,C62,C85

CAP, X7R 0.1uF 16V 10% 0603 AVX 0603YC104KAT

11 43 C13-26,C39,C40,C45-50,C54-56,

C58,C59,C61,C63-75,C90,C93

CAP, X5R,0.1uF,10V,10%,0402

AVX, 0402ZD104KAT

12 1

C43

CAP, X7R 0.047uF 16V 10% 0603 AVX 0603YC473KAT

13 5

C4,C5,C33,C84,C87

CAP, X7R 0.01uF 16V 10% 0603 AVX 0603YC103KAT

14 1

C10

CAP, X7R 2200pF 25V 10% 0603 AVX 06033C222KAT2A

15 0 C9 (Opt) CAP, X7R 2200pF 25V 10% 0603 AVX 06033C222KAT2A

16 1 C41 CAP, X7R 1000pF 25V 10% 0603 AVX 06033C102KAT2A

17 0 C86 (Opt) CAP, X7R 1000pF 25V 10% 0603 AVX 06033C102KAT2A

18 1

C51

CAP, NPO,100pF,25V,10% 0603 AVX 06033A101KAT2A

19 3

C3,C6,C7

CAP, NPO 22pF 50V 10% 0603 AVX 06035A220KAT

20 9 D1-8,D12 LED, GRN 0603 LITE ON LTST-C190KGKT

21 1

D10

DIODE, DUAL SCHOTTKY, SOT23 DIODES INC. BAT54S

22 2 D11,D13 RECTIFIER,GP,1A,50V,SMA DIODE INC, S1A

23 2 D9,D14 DIODE, GP 200V 200MA ,SOD323 DIODES INC. BAV20WS

24 1 J1 HEADER, 3X2, 2mm COMM CON 2202S-06G2

25 0 J7,J8 (Opt)

26 1 J2 HEADER, 2X7, 2mm MOLEX, 87831-1420

27 0 J3,J11 (Opt) HEADER, 2X1, 2mm COMM CON 3201S-02G2

28 1

HEADER, 3X1,100MIL COMM CON 3801S-03G2

Downloaded from Elcodis.com electronic components distributor

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