Linear Technology DC2197A Guida rapida alla configurazione

dc2197afa

DEMO MANUAL DC2197A

Description

Quad 12-/10-/8-Bit

PWM to VOUT DACs

with 10ppm/°C Reference

Demonstration circuit 2197A features the LT C

2645,

Quad 12-/10-/8-Bit PWM to VOUT DACs with 10ppm/°C

reference in a tiny 4.9mm ×4mm 16-lead MSOP package.

DC2197A-A is populated with the 2.5V, 12-bit version of

the LTC2645.

The LTC2645 measures the period and pulse width of the

PulseWidthModulation(PWM)inputandupdatesthevolt-

age output DAC at each rising edge. The PWMfrequency

can be any frequency between 30Hz and 100kHz. The input

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.

BoarD photo

level can be between 1.71V and 5.5V, set by a separate

IOVCC pin. This device solves many of the problems as-

sociated with filtering a PWM signal to produce an analog

voltage, producing a fast-settling, accurate analog voltage

in response to a digital PWM input.

Design files for this circuit board are available at

http://www.linear.com/demo

Figure 1. Basic Connections

ANALOG

OUTPUTS

HEADERS ON REVERSE SIDE ARE FOR

OPERATION WITH A LINDUINO BOARD.

(SEE TEXT)

POWER-DOWN, REFERENCE

CONNECTIONS (SEE TEXT)

PWM

INPUTS

OPTIONAL LOGIC

SUPPLY CONNECTION

1.71V TO 5.5V (SEE TEXT)

VCC CONNECTION

2.7V TO 5.5V (SEE TEXT)

IOVCC

dc2197afa

DEMO MANUAL DC2197A

Quick start proceDure

Standalone Operation

DC2197A makes evaluation of the LTC2645 very easy.

Figure 1 shows the basic connections to operate the

DC2197A as a standalone board. Connect a 2.7V to

5.5V supply to the VCC turret and a GND turret. IOVCC

is connected to VCC by default such that the input logic

level matches the VCC supply. If a different logic level is

required, move the IOVCC jumper to the EXT position and

connect a supply equal to the PWM signals’ logic level

to the IOVCC and GND turrets. There is no sequencing

requirement between VCC and IOVCC.

Any convenient PWM source can be used. A pulse genera-

tor with a computer interface (GPIP, USB, Ethernet, etc.)

can be used for characterization. In the end application,

signals can originate from an FPGA, microcontroller,

programmable logic controller (PLC), optocoupler, etc.

Linduino Operation

DC2197A is in an “Arduino Shield” form factor, compat-

ible with Linear Technology’s DC2026 Linduino board and

other Arduino Uno compatible boards. This provides a

convenient way to evaluate the LTC2645 under computer

control. The Linduino board has two PWM outputs with

16-bit resolution and four with 8-bit resolution. INA and

INB are connected to 16-bit PWM capable outputs on

digital pins 9 and 10, INC and IND are connected to 8-bit

PWM capable outputs on digital pins 5 and 6; these can

be remapped by removing R8 – R11 and making appro-

priate connections to TPA – TPD. The Linduino program

(“sketch”) provides a simple terminal interface allowing

voltages or codes to be entered manually. It can also be

controlled by any programming language that can com-

municate with a USB virtual COM port (Matlab, Python,

C++, C#, etc.) The program can be modified as desired to

change or add functionality.

Install the DC2197A onto the DC2026 as shown in Figure 2.

Ensure that the IOVCC jumper is set to VCC.

dc2197afa

DEMO MANUAL DC2197A

Quick start proceDure

ANALOG

OUTPUTS

LINE UP AND

INSERT CONNECTORS

USB

CONNECTION

TO COMPUTER

Figure 2. Linduino Connections

Follow the procedure for installing drivers and sketchbook in the DC2026 Demo Manual. Upload the DC2197 program

(“sketch”). Select:

File →Sketchbook →Part Number →2000 →2600 →2645 →DC2197

Then click the “Upload” button. Open the Serial Monitor to interact with the program.

dc2197afa

DEMO MANUAL DC2197A

Altera C5G Board Operation

Altera’s C5G evaluation board for the Cyclone 5 GX FPGA

has an Arduino shield port that is compatible with the

DC2197A. The C5G provides 5V to the LTC2645’s VCC

supply, so IOVCC must be changed to 3.3V to match

the voltage of the digital signals coming from the FPGA.

Remove the IOVCC jumper and solder a 100Ω resistor

from the IOVCC turret post to the test point indicated in

Figure 3. Make sure gaps between connectors in the up-

per and lower rows line up properly. The upper row (JP3

and JP4 on the C5G board) will match perfectly; JP10 will

Quick start proceDure

have two empty holes on the left-hand side and JP11 will

have two empty holes on the right-hand side.

A Quartus archive project and FPGA configuration bi-

nary file are included with the DC2197A design files.

The program sends PWM signals to all four DACs. Tw o

quadrature numerically controlled oscillators supply data

to the PWM generator. While not normally intended for AC

signal generation, this demonstration shows the cycle by

cycle updating operation of the LTC2645. Figure 4 shows

all four DAC outputs, and Figure 5 shows the details of

the relationship between the PWM input and DAC output.

2 EMPTY

LOCATIONS

2 EMPTY

LOCATIONS

REMOVE

JUMPER

IOVCC TO

PIN 2

Figure 3. Altera C5G Connections

dc2197afa

DEMO MANUAL DC2197A

Quick start proceDure

Figure 4. Altera Program Operation

Figure 5. PWM Details

dc2197afa

DEMO MANUAL DC2197A

Quick start proceDure

EXTERNAL CONNECTIONS

GND: Four ground turrets are provided. These are con-

nected directly to the ground plane and are the common

connection for all supplies and signals.

IOVCC: I/O supply voltage that sets the high level of the

PWM inputs. Connect to digital supply voltage between

1.71 and 5.5V. Often this can be connected to the same

supply as the device that is providing the PWM signal

(processor, FPGA, etc.).

INA, INB, INC, IND: PWM Inputs. Logic high level is

determined by IOVCC.

VOUTA, VOUTB, VOUTC, VOUTD: DAC Voltage Outputs.

VCC: Analog Supply. Connect to low noise power supply

between 2.7V and 5.5V.

PD:Active Low Power-Down Input. This signal may be

driven externally if the PD jumper is removed.

REF: Reference Output/Input. When the REFSEL jumper

is set to INT, the LTC2645’s internal reference can be

measured at this point. Nominal impedance is 500Ω. If it

is used to drive external circuits it must be buffered ap-

propriately. When REFSEL is set to EXT, an external refer-

ence between 1V and VCC may be connected to this point.

Arduino Shield Connections (IOL1, IOH1, AD0, POWER

headers installed on back side of board) – These headers

mate with the DC2026 Linduino and other Arduino Uno

compatible microcontroller boards.

JUMPERS

IOVCC: Set to VCC to connect IOVCC directly to VCC

(default). No connection to the IOVCC turret is required

in this case. Set to EXT if a separate supply is connected

to the IOVCC turret.

PD:Power Down – Set to ON to enable normal operation

(default.)SettoPD to put theLTC2645into shutdown mode.

IDLSEL: Idle Mode Select Input. Determines the DAC

behavior when the PWM input remains high or low for

more than the Idle Mode Timeout time (50ms minimum,

70ms maximum). When set to HI-Z#/HOLD (default), a

low level on a PWM input will set the DAC output to a high-

impedance state. A high level will cause the DAC output

to hold its last value. When set to ZS#/FS, a low level on

a PWM input will set the DAC output to zero-scale, and a

high level will set the DAC output to full-scale.

REFSEL: Set to INT (default) to use the internal refer-

ence. Set to EXT to supply an external reference to the

REF turret post.

dc2197afa

DEMO MANUAL DC2197A

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

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0603.

LINDUINO HEADERS

TEST PADS ALLOW REMAPPING

LINDUINO CONNECTIONS

DACS A AND B CONNECTED TO 16-BIT

CAPABLE PWM LINDUINO OUTPUTS

DACS C AND D CONNECTED TO 8-BIT

CAPABLE PWM LINDUINO OUTPUTS

-BIT

12A

ASSY TYPE

*U1

LTC2645-L12

SUFFIX

L12

REF

IDLSEL

REFSEL

VOUTB

VOUTA

VOUTC

VOUTD

NPD

IO7

IO0

IO1

IO2

IO3

IO4

IO5

IO6

IO8

IO9

IO11

IO10

IO13

IO12

AREF

IO2

IO10

IO9

IO6

IO5

INB

INA

IND

INC

IOVCC

SDA

SCL

AD3

AD1

AD0

AD2

VIN

+3V3

RESET

VCC

VCC VCC VCC

VCC

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MARK T.PRODUCTION1 02-11-16

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MARK T.PRODUCTION1 02-11-16

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MARK T.PRODUCTION1 02-11-16

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Thursday, February 11, 2016

QUAD 12/10/8-BIT PWM TO VOUT DACS

KIM T.

MARK T.

N/A

LTC2645CMS FAMILY

DEMO CIRCUIT 2197A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Thursday, February 11, 2016

QUAD 12/10/8-BIT PWM TO VOUT DACS

KIM T.

MARK T.

N/A

LTC2645CMS FAMILY

DEMO CIRCUIT 2197A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Thursday, February 11, 2016

QUAD 12/10/8-BIT PWM TO VOUT DACS

KIM T.

MARK T.

N/A

LTC2645CMS FAMILY

DEMO CIRCUIT 2197A

TPD

OPT R9

49.9

E3 VOUTB

LTC2645

INB

GND

VCC 1

VOUTA 2

VOUTB 3

IDLSEL

IOVCC

INA

IND

INC

REF 12

REFSEL

VOUTC 14

VOUTD 15

GND

E6 GND

E16 VCC

0.1uF

POWER

HD1X6-100

TPA

IOH1

HD1X8-100

R11

49.9

TPB

JP3

IDLSEL

HI-Z#/HOLD

ZS#/FS

10k

49.9

JP4

IOVCC

E11

INC

JP1

IOVCC

VCC

EXT

E1 REF

E4 VOUTC

E2 VOUTA

E13

GND

INA

10uF

6.3V

0805

ADO

HD1X6-100

E15

R10

49.9

E7 GND

IOL1

HD1X8-100

E12

IND

JP2

REFSEL

EXT

INT

0.1uF

E10

INB

TPC

49.9

E14

GND

E5 VOUTD

dc2197afa

DEMO MANUAL DC2197A

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 0216 REV A • 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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