Linear Technology DC1485A Guida rapida alla configurazione

dc1485afa

DEMO MANUAL DC1485A

Description

LTC2757

18-Bit, Parallel Input,

SoftSpan IOUT DAC

Demonstrationcircuit1485AfeaturestheLT C

2757Asingle

18-bitSoftSpan™IOUT DAC with±1LSB maximumINL.This

device features six programmable output ranges: 0V to 5V,

0V to 10V, ± 5V, ±10V, ±2.5V and –2.5V to 7.5V. The demo

circuit 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 and QuikEval are trademarks 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

CONNECTIONS

ANALOG POWER SUPPLY

(NORMALLY ±15V)

RIBBON CABLE

TO DC590

CONTROLLER

Figure 1. Connection Diagram

Downloaded from Arrow.com.

dc1485afa

DEMO MANUAL DC1485A

quick start proceDure

Connect a clean ±15V power supply to the turret posts at

the bottom of the DC1485A board. Connect J1 to a DC590

USB serial controller using the supplied 14-conductor rib-

bon cable. Connect DC590 to a host PC with a standard

USB A/B cable. Run the QuikEval™ evaluation software

which can be downloaded from www.linear.com/software.

The correct control panel will be loaded automatically. The

software automatically setsthe LTC2757 outputs according

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 documentation may be available

from the Help menu item, as features may be added

periodically.

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dc1485afa

DEMO MANUAL DC1485A

using the parallel connector

Protocol

The DC1485A can be used without the DC590 QuikEval

system. If a DC590 demo board is not connected the shift

registers on the DC1485A are disabled, allowing the user

to clock in data through the parallel connector (P1).

The data input register is loaded directly from the 18-bit

microprocessor bus (D0-D17 on the parallel connector)

by holding the D_/S pin low and then pulsing the WR_

pin low. The second register (DAC register) is loaded by

pulsing the UPD pin high, which copies the data held in

the input register into the DAC register. Note that updates

always include both data and span; but the DAC register

values will not change unless the input register values

have been changed by writing.

Loading the span input register isaccomplished ina similar

manner, by holding the D_/S pin high and then bringing

the WR_ pin low. The span and data register structures

are the same except for the number of parallel bits. The

span registers have three bits, while the data registers

have 18 bits.

Please see the LTC2757 data sheet for in depth timing

diagrams and more information about the communica-

tion protocol.

Parallel Pin Descriptions

D0-D17: DAC Input/Output Data Bits. These I/O pins set

and read back the DAC code. D17 is the 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 span

registers. For single-span operation, tie D_/S to GND.

READ: Read Pin. When READ is asserted high, the data

I/O pins (D0-D17) or span I/O pins (S0-S2) output the

contentsof the selected register

. For single-span operation,

readback of the span I/O pins is disabled.

UPD: Update and Buffer Select Pin. When READ is held low

and UPD isassertedhigh,thecontentsof the input registers

(both data and span) are copied into their respective DAC

registers. The output of the DAC is updated, reﬂecting the

new DAC register values. When READ is held high, the

update function is disabled and the UPD pin functions as

a buffer selector—logic low to select the input register,

high for the DAC register.

WR_: Active Low Write Pin. A Write operation copies

the data present on the data or span I/O pins (D0-D17 or

S0-S2, respectively) into the input register. When READ

is high, the Write function is disabled.

MSPAN: Manual Span Control Pin. MSPAN is used to

conﬁgure the LTC2757 for operation in a single, ﬁxed

output range.

G: Ground Pin. (Note, if an IDE cable is used, Pin 21 is

often keyed on the connector and may be trimmed.)

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dc1485afa

DEMO MANUAL DC1485A

harDware setup

Jumpers

MSPAN: Manual Span Control Pin. MSPAN is used to

conﬁgure the LTC2757 for operation in a single, ﬁxed

output range. If MSPAN is high it will be conﬁgured for

single-span use. If MSPAN is low it will be set through the

QuikEval Software. Default position is 0 (low).

S0, S1, S2: Used to set the ﬁxed output range if MSPAN

is high. Default position is 0, 0, 0 (0V to 5V).

S2 S1 S0 SPAN

0 0 0 0V to 5V

0 0 1 0V to 10V

0 1 0 ±5V

0 1 1 ±10V

1 0 0 ±2.5 V

1 0 1 –2.5V to 7.5V

REFADJ: Gain Adjust Pin. If no adjustments are required,

select GND. Selecting EXT connects the pin to the turret

allowing external adjustment to null gain error or com-

pensate for reference errors.

RVOS: Offset adjustment for DAC. If no offset adjustment

is required, select GND. Selecting EXT connects the offset

pin to the turret allowing external adjustment of offset.

VCC:Select source for 5V VCC supply. Set to 5V for supply

by onboard LT1236 reference (recommended). Set to REG

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:DAC Reference Voltage. If the onboardLT1236 refer-

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.

RVOS: DAC Offset Adjust Input. Use only if RVOS jumper

is set to EXT. Nominal input range is ±5V.

REFADJ: Gain Adjust Pin. This voltage-control pin can be

used to null gain error or to compensate for reference er-

rors. The gain error change expressed in LSB is the same

for any output range.

Power and Ground Connections

Analog Power: The 15V

, –15V and GND turret posts are

the analog supplies for the internal DAC ampliﬁers. These

should be connected to a well regulated, low noise power

supply.

VCC:Connection to VCC. See schematic and description

for VCC jumper.

Grounding: Separate power and signal grounds are pro-

vided. Signal GND is the turret closest to VOUT

, use this

for measurement ground and output return. Power GND

is between AMP V+and AMP V–turrets.

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dc1485afa

DEMO MANUAL DC1485A

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURE/PART NUMBER KIT QTY

NUMBER OF BOARDS = 175

1 16 C1-C4, C6-C8, C10-C12, C19, C25,

C29, C31, C33, C40

CAP., X5R, 0.1µF 25V 20%, 0402 TDK, C1005X5R1E104M 2800

2 2 C5, C20 CAP., NP0, 100pF 50V, 5%,1206 AVX, 12065A101JAT2A 350

3 1 C9 CAP., X7R, 1µF 25V 10%, 0805 TDK, C2012X7R1E105K 175

4 2 C34, C37 CAP., X5R, 1µF 25V 20%, 0603 TDK, C1608X5R1E105M 350

5 6 C13, C18, C30, C36, C39, C41 CAP., X5R, 10µF 25V 20%,1206 TDK, C3216X5R1E106M 1050

6 1 C14 CAP., X7R, 1µF 25V 10%,1206 AVX, 12063C105KAT2A 175

7 0 C15, C16 CAP., 0603 OPT 0

8 0 C21 CAP., 1206 OPT 0

9 3 C17, C23, C28 CAP., NP0, 100pF 50V, 5%,0402 AVX, 04025A101JAT2A 525

10 2 C38, C35 CAP., X7R, 0.01µF 25V 20%,0402 TDK, C1005X7R1E103M 350

11 3 D1, D2, D5 DIODE, SCHOTTKY, SOT23 DIODES INC., BAT54C-7-F 525

12 9 E1, E2, E3, E4, E5, E6, E7, E8, E9 TEST POINT, TURRET, 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0 1575

13 3 JP1, JP2, JP3 JMP, 2X3, 0.079" SAMTEC, TMM-103-02-L-D 525

14 2 JP4, JP5 JMP, 1X3, 0.079" SAMTEC, TMM-103-02-L-S 350

15 1 J1 HEADER, 2X7 PIN, 0.079CC MOLEX, 87831-1420 175

16 0 J2 CONN, BNC, RTANG 50Ω OPT (TYCO ELEC. AMP, 413631-1) 0

17 1 P1 JMP, 2X20, 0.100" SAMTEC, TSW-120-07-L-D 175

18 2 R1, R2 RES., Chip 10k 1/16W 5%, 0603 VISHAY, CRCW060310K0JNEA 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 RES., Chip 10k 1/16W 5%,0402 VISHAY, CRCW040210K0JNED 700

25 1 R28 RES., Chip 20k 1/16W 5%,0402 VISHAY, CRCW040220K0JNED 175

26 1 U1 I.C., LTC2757ACLX, LQFP48LX LINEAR TECH., LTC2757ACLX 175

27 1 U2 I.C., LT1012ACS8, SO8 LINEAR TECH., LT1012ACS8 175

28 1 U3 I.C., LTC2054HVCS5, SOT23-5 LINEAR TECH., LTC2054HVCS5 175

29 1 U4 I.C., LTC6240HVCS5, SOT23-5 LINEAR TECH., LTC6240HVCS5 175

30 1 U5 I.C., LT1360CS8, SO8 LINEAR TECH., LT1360CS8 175

31 0 U6 I.C., LTC6655AHMS8-5, MSOP8 OPT 0

32 1 U8 I.C., LT1236ACS8-5, SO8 LINEAR TECH., LT1236ACS8-5 175

32 4 U9, U10, U11, U12 I.C., 74VHC595MTC, TSSOP16 FAIRCHILD SEMI., 74VHC595MTCX 700

33 1 U13 I.C., NC7SZ14P5X, SC70-5 FAIRCHILD SEMI., NC7SZ14P5X 175

34 1 U14 I.C., Serial EEPROM, TSSOP8 MICROCHIP, 24LC025-I/ST 175

35 1 U15 I.C., LT1761ES5-5, SOT23-5 LINEAR TECH., LT1761ES5-5 175

36 1 U16 I.C., LT1964ES5-5, SOT23-5 LINEAR TECH., LT1964ES5-5 175

37 8 SHUNTS AS SHOWN ON ASSY DWG SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G 1400

38 4 MTG STAND-OFF, NYLON (SNAP ON), 0.50" TALL KEYSTONE, 8833 (SNAP ON) 700

39 2 STENCILS BOTH SIDES DC1485A-1 2

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dc1485afa

DEMO MANUAL DC1485A

schematic Diagram

D D

C C

B B

A A

NOTES: UNLESS OTHERWISE SPECIFIED

REF

REG

PARALLEL INTERFACE

1. ALL RESISTORS ARE IN OHMS, 0402.

ALL CAPACITORS ARE IN MICROFARADS, 0402.

2. INSTALL SHUNTS ON JUMPERS AS SHOWN.

EXT

0 10

-2.5 7.5

0 -5 5

MANUAL SPAN CONTROL

-2.5 2.5

-10 10

0 5

S1S2

SPAN

VREF

READ

D11

D15

D13

D10

D17

D14

MSPAN

D12

CLR_

D14

VREF

VOUT

D12

UPD

D13

CLR_

WR_

READ

MSPAN

D16

D15

D11

D10

D_/S

D16

UPD

D_/S

WR_

S1 MSPANS0

V+

+5V

V-

VCC

+5V

VCC

V-

V+

VCC

-5V

VCC

V+

V-

VCC

-5V -5V

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

DEMO CIRCUIT 1485A

02/13/2014, 11:18 AM 1 1

LEO C.

18-BIT PARALLEL INPUT, CURRENT OUTPUT DAC WITH READBACK

N/A LTC2757CLX

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

DEMO CIRCUIT 1485A

02/13/2014, 11:18 AM 1 1

LEO C.

18-BIT PARALLEL INPUT, CURRENT OUTPUT DAC WITH READBACK

N/A LTC2757CLX

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

DEMO CIRCUIT 1485A

02/13/2014, 11:18 AM 1 1

LEO C.

18-BIT PARALLEL INPUT, CURRENT OUTPUT DAC WITH READBACK

N/A LTC2757CLX

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

LEO C.

PRODUCTION

__ 202-13-14

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

LEO C.

PRODUCTION

__ 202-13-14

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

LEO C.

PRODUCTION

__ 202-13-14

R23 100R23 100

U12

74VHC595MTC

U12

74VHC595MTC

SCLR

GND

SER

SCK

RCK

VCC

QA 15

QB 1

QC 2

QD 3

QE 4

QF 5

QG 6

QH 7

Q'H 9

10K

0603

10K

0603

74VHC595MTC

SCLR

GND

SER

SCK

RCK

VCC

QA 15

QB 1

QC 2

QD 3

QE 4

QF 5

QG 6

QH 7

Q'H 9

0.1uF

1uF

0805

1uF

0805

0603

R25

10K

R25

10K

R28

20K

R28

20K

RVOS

C29

0.1uF

C29

0.1uF

E6 VREF

JP3

HD2X3-079

JP3

HD2X3-079

5 6

HD2X20-100

15 14

U11

74VHC595MTC

U11

74VHC595MTC

SCLR

GND

SER

SCK

RCK

VCC

QA 15

QB 1

QC 2

QD 3

QE 4

QF 5

QG 6

QH 7

Q'H 9

R17

4.99K

R17

4.99K

JP1

HD2X3-079

JP1

HD2X3-079

R30

4.99K

R30

4.99K

C25

0.1uF

C25

0.1uF

C37

1uF

0603

25V

C37

1uF

0603

25V

C17

100pF

C17

100pF

E2 GND

C31

0.1uF

C31

0.1uF

C33

0.1uF

C33

0.1uF

C12

0.1uF

C12

0.1uF

R24

10K

R24

10K

OPT

C15

0603OPT

C15

0603OPT

LT1012ACS8

0603

C14

1uF

1206

C14

1uF

1206

100

BAT54C

1 3

C21

1206

OPT

C21

1206

OPT

0.1uF

R16

4.99K

R16

4.99K

U14

24LC025-I /ST

U14

24LC025-I /ST

SDA 5

VCC 8

VSS

WP 7

SCL 6

U10

74VHC595MTC

U10

74VHC595MTC

SCLR

GND

SER

SCK

RCK

VCC

QA 15

QB 1

QC 2

QD 3

QE 4

QF 5

QG 6

QH 7

Q'H 9

R27

4.99K

R27

4.99K

C23

100pF

C23

100pF

0603

C38

0.01uF

C38

0.01uF

U15

LT1761ES5-5

U15

LT1761ES5-5

BYP 4

OUT 5

VIN

GND

SHDN

C19

0.1uF

C19

0.1uF

U16

LT1964ES5-5

U16

LT1964ES5-5

SHDN 4

OUT 5

GND

BYP

R29

4.99K

R29

4.99K

C40

0.1uF

C40

0.1uF

C18

10uF,25V

1206

C18

10uF,25V

1206

R26

10K

R26

10K

JP4

EXT

GND

JP4

EXT

GND

0.1uF

CS/CS/

GND

E1 VOUT

SDISDI

JP5

EXT

GND

JP5

EXT

GND

LTC6655AHMS8-5

SHDN

VIN

GND

4GND 5

VOUT_S 6

VOUT_F 7

GND 8

C10

0.1uF

C10

0.1uF

SDOSDO

R21 100R21 100

C13

10uF,25V

1206

C13

10uF,25V

1206

C35

0.01uF

C35

0.01uF

CLKCLK

BAT54C

1 3

JP2

HD2X3-079

JP2

HD2X3-079

E7 VCC

LT1236ACS8-5

VIN

GND

4TRIM 5

VOUT 6

NC 7

NC 8

R31

10K

R31

10K

R22 100R22 100

0603

C39

10uF,25V

1206

C39

10uF,25V

1206

R19 4.99KR19 4.99K

0.1uF

BAT54C

1 3

LTC6240HVCS5

C34

1uF

0603

25V

C34

1uF

0603

25V

REFADJ

R18

4.99K

R18

4.99K

0.1uF

U13

NC7SZ14P5X

U13

NC7SZ14P5X

2 4

10K

0603

10K

0603

LT1360CS8

R11

4.99K

R11

4.99K

100pF

1206

100pF

1206

C11

0.1uF

C11

0.1uF

HD2X7-079-MOLEX

MOSI/SDA 7

EESDA 9

V+ 1

5V 2

CS 6

SCK/SCL 4

EEVCC 10

MISO 5

EESCL 11

EEGND 12

AUX 14

GND

C30

10uF,25V

1206

C30

10uF,25V

1206

AMP V+

C20

100pF

1206

C20

100pF

1206

AMP V-

0.1uF

C28

100pF

C28

100pF

LTC2757CLX

D13

D12

D11

D15

D14

RVOS 39

VDD 17

D10

D_/S

READ

WR_

36 UPD

RINS 1

IOUT2F 6

IOUT1 40

RINF 2

MSPAN

GND

REFADJ 48

RCOM 47

REFF 46

REFS 45

ROFSF 43

ROFSS 44

RFBS 42

RFBF 41

IOUT2S 5

GND/IOUT3 4

CLR_

GND

D16

9D17

C41

10uF,25V

1206

C41

10uF,25V

1206

100

C36

10uF,25V

1206

C36

10uF,25V

1206

4.02K

0603

4.02K

0603

0.1uF

R20

100

R20

100

C16

0603

OPT

C16

0603

OPT

LTC2054HVCS5

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dc1485afa

DEMO MANUAL DC1485A

assembly Drawings

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dc1485afa

DEMO MANUAL DC1485A

assembly Drawings

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dc1485afa

DEMO MANUAL DC1485A

pcb layout anD Film

Top Silkscreen Top Solder Paste

Top Solder Mask

dc1485afa

DEMO MANUAL DC1485A

pcb layout anD Film

Layer 1-Top Layer Layer 2-GND Plane 1

Layer 3- GND Plane 2 + PWR Traces

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