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6

dc1485af

DEMO MANUAL DC1485A

SCHEMATIC DIAGRAM

5

5

4

4

3

3

2

2

1

1

D

D

C

C

B

B

A

A

2.

7V

V

in

5V

N

O

T

E

S

 U

N

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S

 OTHERW

ISE SPECIFIED

RE

F

RE

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L

E

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 IN

TERFACE

1.

  AL

L

 RE

S

IS

T

O

R

S

 ARE

 I

N

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H

M

S

, 0402.

     AL

L

 CAP

ACI

T

O

RS

 ARE

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N

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ICRO

F

A

RADS

, 0402.

2.

  IN

S

T

A

LL S

H

U

N

TS

 ON

 J

U

MP

E

R

S

 A

S

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H

OW

N

.

EXT

1

0

0

0

S0

0

1

1

1

1

0

0    

 1

0

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.5

    

  7

.5

0

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5

     

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1

M

A

NUAL

 S

P

A

N CO

NT

RO

L

-2

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  2

.5

0

0

0

1

-1

0

      1

0

0

0

     5

0

1

S1

S2

0

1

SPA

N

2

DC1485A-

2 * LTC

27

57

C

L

X

W

ed

n

es

d

ay

, Ju

ly

 29,

 2009

11

KIM

 T

.

LEO

 C

.

18

-B

IT

 P

A

R

A

L

L

E

L

 I

N

P

U

T

, CURRE

NT

 O

U

T

P

UT

 DAC W

IT

H

 RE

ADBACK

A

SC

H

E

MA

T

IC

SI

Z

E

DAT

E

:

DW

G

 N

O

.

R

E

V

SH

EE

T

O

F

TITLE

:

CO

NT

RAC

T

 N

O

.

A

PPR

O

V

A

L

S

DRAW

N

:

CHECKED:

APPRO

V

E

D

:

ENG

INE

E

R

:

DESIGN

E

R

:

T

E

CHNO

L

O

G

Y

F

ax:

 (4

08)

434-

050

7

M

ilp

it

as

, C

A

 95035

P

h

o

n

e:

 (4

08)

432-

1900

1630 M

cCart

h

y B

lv

d

.

LTC

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o

nf

ide

n

ti

al

-For

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u

st

om

er

 U

se

 Only

CUS

TOME

R NOTI

CE

L

INEAR T

E

CHNOL

OGY HAS M

A

DE A BEST

 EF

FO

R

TO

 D

E

S

IG

N

 A

CIRCUIT

 T

H

AT

 M

EET

S CUST

OM

ER-SUPPL

IED SPECI

FI

C

A

TI

O

N

S

;

HO

W

EVER, IT REM

A

INS THE CUSTO

M

ER'

S

 R

E

S

P

O

N

S

IB

IL

IT

Y

 T

O

VERIF

Y PROPER AND REL

IABL

E

 OPERAT

ION I

N

 T

H

E

 A

C

TU

A

L

APPL

ICAT

ION.  COM

P

ONENT

 SUBST

IT

U

T

ION AN

D

 P

R

IN

TE

D

CIRUIT

 BOARD L

A

YOUT

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A

Y SIGNIF

ICANT

L

Y

 AF

F

E

CT

 CIRCUIT

PERF

O

RM

ANCE OR REL

IABIL

IT

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ACT

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IN

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A

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T

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P

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G

IN

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R ASSIST

ANCE.

T

H

IS CIRCUIT

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ARY T

O

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E

C

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Y

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N

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IN

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A

R

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CHNOL

OGY 

PART

S.

VR

EF

RE

A

D

D1

D11

D15

D13

D10

G

D17

D17

D4

D8

D6

D3

D14

S0

MSPA

N

D8

D12

CL

R_

D14

VR

EF

VO

U

T

D5

D12

D6

UP

D

D13

CL

R_

WR

_

D2

RE

A

D

MSPA

N

D7

D16

D7

D0

D1

D15

D11

G

D0

D2

D10

D9

D_/

S

S2

D4

D16

S1

D9

UP

D

D_/

S

WR

_

S0

D3

D5

S1

S1

MSPA

N

S0

G

G

S2

S2

G

G

G

G

V+

V+

5V

V+

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V-

V-

VC

C

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5V

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VC

C

V-

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VC

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-5

V

VC

C

V+

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VC

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V

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V

C20 100p

F

 

1206

U8

L

T

12

36ACS

8-

5

1

2

3

4

5

6

7

8

NC

VI

N

NC

GN

D

T

R

IM

VO

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T

NC

NC

C41 10u

F

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100

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1u

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100

JP

2

HD2X

3-

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1

3

5

6 4 2

R26 10K

R28 20K

C14 1u

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1206

U12

74

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HC595M

T

C

10

8

14

11

12

16

13

15

1

2

3

4

5

6

7

9

SC

L

R

GN

D

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SC

K

RCK

VC

C

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QA

QB

QC

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U6

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8-

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1

2

3

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JP

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EXT

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RV

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74

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HC595M

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10

8

14

11

12

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13

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1

2

3

4

5

6

7

9

SC

L

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GN

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SC

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VC

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QA

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QC

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R9

100

R6 4.

02K

0603

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1u

F

C23 100

p

F

R27 4.

99K

C17 100

p

F

U9

74

V

HC595M

T

C

10

8

14

11

12

16

13

15

1

2

3

4

5

6

7

9

SC

L

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SC

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VC

C

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QA

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10K 

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54

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EXT

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1

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1206

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C29 0.

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C19 0.

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C11 0.

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5-

5

4

5

1

2

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SH

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IN

BY

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C38 0.

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VR

EF

R17

4.

99K

R29 4.99K

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R21

100

R31 10K

C31

0.

1u

F

C7 0.

1u

F

C33 0.

1u

F

P1

HD2X

20-

10

0

7

12

2

1 3 5

11

9

6

4

10

8

13 15

14 16

17 19 21 23 25 27 29 31 33 35 37 39

18 20 22 24 26 28 30 32 34 36 38 40

C13 10u

F

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5V

1206

D1

BAT

54

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1

3

2

JP

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3-

079

1 3 5

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+

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8

2

3

6

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4

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1206

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C6 0.

1u

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C35

0.

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+

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4

1

5

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1 2

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A

V+ 5V

CS

SC

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/SC

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EEVC

C

MISO

EESC

L

EEG

N

D

AUX

GND

GND

GND

C9 1u

F

0805

R20

100

C34 1u

F

0603

25V

U11

74

V

HC595M

T

C

10

8

14

11

12

16

13

15

1

2

3

4

5

6

7

9

SC

L

R

GN

D

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SC

K

RCK

VC

C

G

QA

QB

QC

QD

QE

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C28 100

p

F

C4 0.

1u

F

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R

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F

ADJ

R16

4.

99K

C30

10u

F

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5V

1206

JP

1

HD2X

3-

079

1

3

5

6 4 2

CS

/

R7 1K 0603

R30 4.99K

C16

0603

OP

T

U1

LTC

27

57

C

L

X

12 13 14

10 11

39

17

15 16 23 24

33

34

36

35

1

25 26 27 28 29 30 31

3

38 37

6

40

2

21

18

19

48

47

46

45

43

44

42

41

5

4

20

7

22

32

9

8

D13 D12 D11

D15 D14

RV

O

S

VDD

D10 D9 D8 D7

D_/S

READ

WR_

UPD

RINS

D6 D5 D4 D3 D2 D1 D0

S2 S1 S0

IOU

T

2

F

IOU

T

1

RINF

MSPAN

GND

GND

REF

ADJ

RCOM

REF

F

REF

S

ROF

SF

ROF

SS

RFBS

RFBF

IOU

T

2

S

GN

D

/IOU

T

3

CLR_

GND

NC

NC

D16

D17

C40 0.

1u

F

E7

VC

C

CL

K

+

-

U3

L

T

C

2054CS

5

3

4

1

5

2

E4

GN

D

C12 0.

1u

F

U14 24L

C025-

I /

S

T

5

8

1

2

3

4

7

6

SD

A

VC

C

A0

A1

A2

VSS

WP

SC

L

D5

BAT

54

C

1

3

2

R22

100

R3

1K

0603

C25 0.

1u

F

E3

AM

P

 V

+

R24 10K

U15

L

T

1761E

S

5-

5

4

5

1

2

3

BY

P

OU

T

VI

N

GN

D

SH

D

N

C39 10u

F

,2

5V

1206

R25 10K

C15

0603

OP

T

J2

OP

T

C18 10u

F

,2

5V

1206

R18

4.

99K

R11

4.

99K

+

-

U2

L

T

10

12ACS

8

2

3

6

7

4

R

19

4.

99K

Summary of Contents for DC1485A

Page 1: ...t allows all of the LTC2757 s features to be exercised including system level gain and offset adjustments L LT LTC LTM Linear Technology and the Linear logo are registered trademarks and SoftSpan is a trademark of Linear Technology Corporation All other trademarks are the property of their respective owners Design files for this circuit board are available at http www linear com demo DAC CONNECTION...

Page 2: ...Run the evaluation software supplied with DC590ordownloaditfromwww linear com software The correct control panel will be loaded automatically The softwareautomaticallysetstheLTC2757outputsaccording to the entries in the control panel A square wave option is available to test settling time MSPAN jumper should be in the lower position if software span control is desired Additional software documenta...

Page 3: ...he MSB D0 is the LSB S0 S2 Span Input Output Pins S0 S1 and S2 are used to program and to read back the output range of the DAC _D S Data Span Select This pin is used to select acti vation of the data or span I O pins D0 to D17 or S0 to S2 respectively along with their respective dedicated registers for write or read operations Update operations ignore _D S since all updates affect both data and s...

Page 4: ...dLT1236reference recommended SettoREG to be supplied by regulated supply from DC590 Controller and remove the jumper to supply externally Analog Connections Turret Posts VOUT DAC Voltage Output VREF DACReferenceVoltage IftheonboardLT1236refer ences are selected the voltage may be measured at these points If a remote reference is selected then an external reference must be applied to these points V...

Page 5: ...NEA 350 19 3 R7 R8 R3 RES Chip 1k 1 16W 5 0603 VISHAY CRCW06031K00JNEA 525 20 6 R4 R9 R20 R21 R22 R23 RES Chip 100Ω 1 16W 5 0402 VISHAY CRCW0402100RJNED 1050 21 1 R5 RES Chip 10Ω 1 16W 5 0603 VISHAY CRCW060310R0JNEA 175 22 1 R6 RES Chip 4 02k 1 16W 1 0603 VISHAY CRCW06024K02FKED 175 23 8 R11 R16 R17 R18 R19 R27 R29 R30 RES Chip 4 99k 1 16W 1 0402 VISHAY CRCW04024K99FKED 1400 24 4 R24 R25 R26 R31 R...

Page 6: ... QF QG QH Q H U6 LTC6655AHMS8 5 1 2 3 4 5 6 7 8 SHDN VIN GND GND GND VOUT_S VOUT_F GND JP5 EXT GND 1 3 2 E9 RVOS U10 74VHC595MTC 10 8 14 11 12 16 13 15 1 2 3 4 5 6 7 9 SCLR GND SER SCK RCK VCC G QA QB QC QD QE QF QG QH Q H R9 100 R6 4 02K 0603 C2 0 1uF C23 100pF R27 4 99K C17 100pF U9 74VHC595MTC 10 8 14 11 12 16 13 15 1 2 3 4 5 6 7 9 SCLR GND SER SCK RCK VCC G QA QB QC QD QE QF QG QH Q H R2 10K 0...

Page 7: ...7 dc1485af DEMO MANUAL DC1485A ASSEMBLY DRAWINGS ...

Page 8: ...8 dc1485af DEMO MANUAL DC1485A ASSEMBLY DRAWINGS ...

Page 9: ...9 dc1485af DEMO MANUAL DC1485A PCB LAYOUT AND FILM Top Silkscreen Top Solder Paste Top Solder Mask ...

Page 10: ...10 dc1485af DEMO MANUAL DC1485A PCB LAYOUT AND FILM Layer 1 Top Layer Layer 2 GND Plane 1 Layer 3 GND Plane 2 PWR Traces ...

Page 11: ...11 dc1485af DEMO MANUAL DC1485A PCB LAYOUT AND FILM Layer 4 Bottom Layer Bottom Solder Mask ...

Page 12: ...12 dc1485af DEMO MANUAL DC1485A PCB LAYOUT AND FILM Bottom Solder Paste Bottom Silkscreen ...

Page 13: ...nology Corporation is believed to be accurate and reliable However noresponsibilityisassumedforitsuse LinearTechnologyCorporationmakesnorepresentation that the interconnection of its circuits as described herein will not infringe on existing patent rights PC FAB DRAWING ...

Page 14: ...LUDING 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 go...

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