Linear Technology DC416 Guida rapida alla configurazione

dc416f

DEMO MANUAL DC416

Description

quick start proceDure

LTC1864

16-Bit 250ksps ADC

Demonstration circuit 416 features the LTC1864 16-bit

250ksps analog-to-digital converter.

This board provides a means to evaluate the performance

oftheLTC1864witheithertheLinearTechnologyPScope™

data acquisition system, or with other parallel or serial

data acquisition systems.

The board also demonstrates proper layout techniques in

the circuitry surrounding the ADC and in the segmenta-

tion of the planes required to achieve full performance

with the ADC.

These techniques include proper grounding of the device

and associated bypass capacitors, placement of the device

relativetointerconnectionofanaloganddigitalsubsystems

and signal routing in proximity to the ADC.

This board performs serial to parallel conversion in a man-

ner that is unlikely to be used in an actual implementation,

but is representative of what could be implemented in an

FPGA. It is expected that with this ADC, the interface will

be performed serially with either programmable logic, a

general-purpose processor, a DSP, or across an isolated

link of one of many types. The complexity of the circuitry

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.

is hence much greater than what would be required in

almost any practical application.

The LTC1864 and its demo board are intended to be used

with the PScope data acquisition system for characteriza-

tion of the ADC in AC applications extending from Hz to

MHz. The full power bandwidth of the LTC1864 is high

enough to produce good performance in under-sampling

applications, as well as applications where the signal

content is below Nyquist.

The board contains a bandwidth-limiting filter at the input

of the ADC (C7, C8, C9, R1 and R2), as well as provision

for an amplifier (U2). This bandwidth-limiting filter (–3dB at

1.5MHz)istypicalofwhatmay be requiredformany applica-

tions, but it is not necessarily the best for all applications.

Theboard also incorporates an LTC1799 resistor program-

mable oscillator as an optional clock source.

Design files for this circuit board are available at

http://www.linear.com/demo/DC416

Demonstration circuit 416 is easy to set up to evaluate

the performance of the LTC1864. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below:

NOTE: The demo board is shipped with jumpers in place

to allow the use of an external oscillator at 80×the sample

rate. Figure 1 shows the default jumper positions.

1. Connect the parallel output J4 to either the DC718 data

collection board, or to a suitable acquisition system.

Pin 3 of J4 is the data strobe.

2. Observe correct polarity; Connect +8V to +15V to

terminal E1. Note that –15V is only required if U2 is

installed. There are two on board regulators. Both are

5V, although U1 the reference can be substituted with

a lower voltage.

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dc416f

DEMO MANUAL DC416

quick start proceDure

Figure 1. Proper Measurement Equipment Setup

3. If the intent is to do an evaluation of AC performance,

connect a sinusoidal (or other) input signal to J1, or

J1 and J2, with a nominal DC bias of 2.5V. If only J1 is

used (single-ended operation), JP3 should be installed.

Thisconverterconvertsunipolardifferentialinputsfrom

0 – VREF.

NOTE: The AIN inputs do not have 50Ω termination. Most

generators will produce the correct signal level only if the

cable is terminated at 50Ω. If you are driving this from

a generator, you should use 50Ω through terminators.

Take care not to overdrive the inputs if you do not use

terminators.

4. Connect a 20MHz digital clock to CLKIN. With default

jumpers in place, this will result in a 250ksps conver-

sion rate.

5. Collect data via PScope for a Fourier transform into the

frequency domain, or to allow data to be collected and

saved to a file for subsequent import and analysis in

Excel, Matlab or other analysis packages.

Duplication of the FFT results shown in the data sheet

requires the use of a low jitter clock and waveform genera-

tors synchronized such that the input waveform must be

within a few ppm of an exact multiple of the conversion

clockdividedbythe FFT size(termed coherent). For 250kHz

sample rate and a 4096 point FFT, input frequencies should

bean exact multiple of 61.035156Hz, and preferably aprime

number multiple or at least an odd number multiple. The

use of an even number multiple will exercise a minimal

number of codes, producing poor results.

DC416 F01

–

SIGNAL

SOURCE

PARALLEL

DATA

COLLECTION

SYSTEM

CLOCK

SOURCE

IF DIFFERENTIAL

SIGNAL SOURCE

IF U2 POPULATED WITH BIPOLAR AMPLIFIER

USE EITHER

PARALLEL OR SERIAL

DATA COLLECTION SYSTEM

SERIAL DATA

COLLECTION SYSTEM

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dc416f

DEMO MANUAL DC416

operation

The conversion clock (CONV) is derived from the CLKIN

connector (J3) via a programmable divider.

The board is shipped with this divider set to divide by 80

(JP8 and JP9). In order for this converter to achieve its

maximum throughput of 250ksps, the data transfer time

must be completed in 1/fSAMPLE – TCONV, which requires

that the SCLK be at 20MHz.

The programmable divider can be strapped for differ-

ent divide ratios if the required sample rate is less than

250ksps, allowing a greater percentage of the time avail-

able doing data transfer (divide ratio of less than 80), or

if a comparable SCLK rate is used, with a lower sample

rate (divide ratio greater than 80).

JP8 and JP9 are set to code 16–(divide ratio/16) or 11 in

the case of a divide ratio of 80.

The counter circuitry gates a sequence of 16 clock pulses

during CONV = 0. These can be observed on CLKOUT, or

if CONV is introduced externally, (remove JP4) the clock

pulses can be introduced via CLKIN (JP6 to pin 1, JP7 to

pin 1 if no inversion is required).

JP6 (pin 2–3) allows the use of the onboard LTC1799

oscillator. Note that this oscillator will not produce data

sheet performance unless the input frequency is quite low,

as the phase jitter of this oscillator will be transformed in

the presence of high slew rate signals into random noise.

If the amplitude of the signal falls off with increasing

frequency as many natural phenomena do, this oscillator

may produce acceptable results.

If you are under-sampling, or operating the converter near

Nyquist, it is important to have a low jitter clock source.

The data output DOUT is shifted into a pair of 74HC595

serial to parallel shift registers that have output holding

registers, and tri-stateable outputs. If you intend to in-

corporate the demo board into a prototype of a system,

ENABLEDATA can be used to gate the outputs onto a

16-bit bus. Alternatively, all of the signals can be produced

externally, and data can be read into a DSP via DOUT.

If you elect to use the on-board timing to clock data into a

slaved serial input port, you can use DOUT, CKOUT, along

with CONV as a busy signal or as a means of producing

a frame sync.

In the event that you do not have “coherent” signal sources

as described above, you can use windowing functions

to reduce the “leakage” effect that occurs in the Fourier

transform and get a reasonably accurate figure for SNR,

THD, SINAD and the levels of the various harmonics.

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dc416f

DEMO MANUAL DC416

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 15 C1, C4-C6, C10, C11, C13-C20, C23 CAP., X7R, 0.1µF, 16V AVX, 0603YC104MAT1A

2 1 C2 CAP., X7R, 1µF, 10V, 20% AVX, 0805ZC105MAT1T

3 2 C3, C12 CAP., X5R, 10µF, 6.3V, 20%, 1206 TAIYO YUDEN JMK316BJ106M LT

4 2 C7,C9 CAP., NPO, 100PF, 50V, 1206 VITRAMON, VJ1206A101JXB

5 1 C8 CAP., NPO, 470PF, 100V,1206 AVX, 12061A471JAT

6 2 C21, C22 CAP., NPO, 47PF, 50V AVX, 06035A470MAT1A

7 9 E1-E9 TP, TURRET, .094" MILL-MAX, 2501-2

8 5 JP1, JP2, JP3, JP4, JP5 JMP, 1 ×2 .079CC COMM-CON, 2802S-02-G1

9 2 JP6, JP7 JMP, 1 ×3 .079CC COMM-CON, 2802S-03-G1

10 2 JP8, JP9 JMP, 2 ×3 .079CC COMM-CON, 2202S-06-G2

11 9 SHUNTS FOR JP1-JP9 SHUNT, .079" CENTER COMM-CON, CCIJ2MM-138G

12 3 J1-J3 CONN, BNC 50Ω, PCB-VERTICADTL CONNEX, 112404

13 1 J4 CON, HDR, .1 ×.1 CNTRS, 40PIN COMMCON, 3201S-40G1

14 1 RN1 RES 2 ×4 ARRAY, CHIP, 330Ω, ISO CTS, 742-C083-331JTR-ND

15 2 R1, R2 RES, CHIP 100, 1/16W, 5%, 1206 AAC, CR18-101JM

16 2 R3, R4 RES, CHIP 2, 1/16W, 5%, 0603 AAC, CR16-2R0JM

17 2 R5, R6 RES, CHIP 402, 1/16W, 1%,0603 AAC, CR16-4020FM

18 1 R7 RES, CHIP 20k, 1/16W, 5%,0603 AAC, CR16-203JM

19 1 R8 RES, CHIP 15k, 1/16W, 5%,0603 AAC, CR16-153JM

20 1 R9 RES, CHIP 51, 1/16W, 5%,0603 AAC, CR16-510JM

21 1 R10 RES POT3321H, POT-3321H-MURATA MURATA, POT3321H-1-103

22 1 U1 IC, LT1021DCS8-5, SO8 LINEAR TECH., LT1021DCS8-5

23 0 U2 IC, OP AMP, SO8 TBD

24 1 U3 IC, LTC1864AIMS8, MSOP8 LINEAR TECH., LTC1864AIMS8

25 2 U4, U5 IC, MC74HC595ADT, TSSOP16 MOTOROLA, MC74HC595ADT

26 2 U6, U7 IC, MC74HC163AD, SO16 MOTOROLA, MC74HC163AD

27 1 U8 IC, MC74AC14DTR2, TSSOP14 ON SEMI., MC74AC14DTR2

28 1 U9 IC, MC74AC00DTR2, TSSOP14 ON SEMI., MC74AC00DTR2

29 1 U10 IC, LTC1799, SOT23-5 LINEAR TECH., LTC1799

30 1 U11 IC, LT1121CST-5, SOT223 LINEAR TECH., LT1121CST-5

31 1 U12 IC, MC74AC109DR2, SO16 ON SEMI., MC74AC109DR2

32 1 U13 IC, MC74AC32DTR2, TSSOP14 ON SEMI., MC74AC32DTR2

33 4 MTGS AT 4 CORNERS SCREW, #4-40, 1/4" ANY

34 4 MTGS AT 4 CORNERS STANDOFF, NYLON HEX #4-40 1/2" MICRO PLASTICS 14HTSP003

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS.

2. INSTALL SHUNTS ON JP1, JP3-JP7 PIN 1 AND 2;

ON JP8 AND JP9 PIN 2 AND 4, PIN 3 AND 5.

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dc416f

DEMO MANUAL DC416

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

D D

C C

B B

A A

0805

ANALOG GROUND PLANE

NOTES:UNLESS O TH E RWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS.

ON JP8 AND JP9 PIN 2 AND 4, PIN 3 AND 5.

2. INSTALL SHUNTS ON JP1,JP3-JP7 PIN 1 AND 2;

DC416A-2 * LTC1864CMS8

Wednesday, February 06, 20 02 1 1

16 BIT 250 KSPS ADC

KIM T.

DEREK R.

SIZE

DATE:

DWG NO. REV

SHEET OF

TITLE:

CONTRACT NO.

APPROVALS

DRAWN:

CHECKED:

APPROVED:

ENGINEER:

DESIGNER:

TECHNOLOGYFax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

ENABLEDATA

CONV

IN-

IN+

CLKIN

DOUT

CLKOUT

CLK

+5VDIG

+5VAN

+5VDIG

-15V

+5VDIG

+15V

+5VDIG +5VDIG

+5VAN

+15V

+15V+5VDIG

+5VDIG

+5VDIG+5VDIG

U13B

74AC32 4

U9D

74AC00

12 11

10UF

6.3V

1206J4

3201S-40G1

U9B

74AC00

147

U9A

74AC00

C10

0.1UF

100PF

1206

JP9

5 6

JP6 13

LTC1864CMS8

CONV

VCCVREF

+IN

-IN

GND

SCLK

DOUT

0.1UF

74HC163AD

GND

RESET

CLK

ENP

VCC

RCO

ENT

100

1206

U8F

74AC14

13 12

20K

U8C

74AC14

OPT

R10

10K

JP2

1 2

74HC163AD

GND

RESET

CLK

ENP

VCC

RCO

ENT

JP4

1 2

U8D

74AC14

9 8

IN- 1

C16

0.1UF U8E

74AC14

11 10

JP7

C11

0.1UF

U13A

74AC32

JP1

1 2

C23

0.1UF

CLKOUT

AGND

+15V

U10

LTC1799

3 4

V+

GND

SET DIV

OUT

C22

47PF

1UF 10V

470PF

1206

U12B

74AC109

CLK

VCC

PRE

GND

CLR

U13C

74AC32

10 8

C12

10UF

6.3V

1206

JP3

1 2

CLKIN

0.1UF

15K

IN+ 1

U11

LT1121CST-5

VIN

GND

OUT

0.1UF

DGND

100

1206

U9C

74AC00

100PF

1206

C13

0.1UF

JP8

1 2

5 6

C21

47PF

RN1

330

C14

0.1UF

C15

0.1UF

74HC595ADT

GND

VCC

OENB

LCLK

SCLK

RESET

SQH

U8A

74AC14

1 2

C17

0.1UF

DOUT

402, 1%

C19

0.1UF

C20

0.1UF

ENABLEDATA

0.1UF

CONV

U13D

74AC32

13 11

147

74HC595ADT

GND

VCC

OENB

LCLK

SCLK

RESET

SQH

JP5

1 2

DGND

C18

0.1UF

402, 1%

-15V

LT1021-5

VIN

GND

VOUT

U8B

74AC14

3 4

147

U12A

74AC109

CLK

VCC

PRE

GND

CLR

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dc416f

DEMO MANUAL DC416

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 0713 • 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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