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Schematics and Layout

www.ti.com

8

Schematics and Layout

Schematics for the DAC8728EVM are appended to this user's guide. The bill of materials is provided in

Table 13

.

8.1

Bill of Materials

NOTE:

All components should be compliant with the European Union Restriction on Use of

Hazardous Substances (RoHS) Directive. Some part numbers may be either leaded or
RoHS. Verify that purchased components are RoHS-compliant. (For more information about
TI's position on RoHS compliance, see the

TI web site

.)

Table 13. DAC8728EVM Bill of Materials

(1)

Item No.

Qty

Ref Des

(2)

Description

Manufacturer

Mfr Part Number

1

1

N/A

Printed wiring board

TI

6499061

2

9

C1, C14, C28,

Capacitor, Ceramic 1

m

F 50V X7R 0805

MuRata

GRM21BR71H105KA12L

C29, C30, C31,

C32, C33, C34

3

6

C2, C15, C18,

Capacitor, Ceramic 1.0

m

F 16V X5R 10% 0603

TDK

C1608X5R1C105K

C19, C40, C41

4

1

C3

Capacitor, Ceramic 22

m

F 6.3V X5R 20% 0805

TDK

C2012X5R0J226M

5

3

C4, C9, C16

Capacitor, Ceramic 47

m

F 6.3V X5R 0805

Taiyo Yuden

JMK212BJ476MG-T

6

2

C5, C6

Capacitor, Ceramic 10000pF 50V X7R 10%

TDK

C1608X7R1H103K

0603

7

8

C7, C8, C12, C13,

Capacitor, Ceramic 0.10

m

F 50V X7R 10% 0603

TDK

C1608X7R1H104K

C20, C42, C43,

C44

8

0

C10, C11

Do not install

9

7

C17, C23, C25,

Capacitor, Ceramic 10

m

F 16V X5R 0805

Taiyo Yuden

EMK212BJ106KG-T

C36, C37, C38 ,

C39

10

4

C22, C24, C26,

Capacitor, Ceramic 10

m

F 50V X7S 1210

Taiyo Yuden

UMK325C7106MM-T

C27

11

3

J1, J3, J5 Top

20-pin header

Samtec

TSM-110-01-T-DV

12

3

J1, J3, J5 Bottom

20-pin socket

Samtec

SSW-110-22-S-D-VS

13

1

J2

TERMINAL BLOCK 3.5MM 2POS PCB

On Shore

ED555/2DS

14

1

J4 Top

10-pin header

Samtec

TSM-105-01-T-DV

15

1

J4 Bottom

10-pin socket

Samtec

SSW-105-22-S-D-VS

16

1

J6 Top

32-pin header

Samtec

TSM-116-01-T-DV

17

1

J6 Bottom

32-pin socket

Samtec

SSW-116-22-S-D-VS

18

2

JP1, JP2

2-position, dual row header

Samtec

TSW-104-22-T-D

19

11

JP3, JP4, JP5,

3-position header

Samtec

TSW-103-22-T-S

JP6, JP7, JP9,

JP14, JP15, JP17,

JP19, JP20

20

5

JP8, JP11, JP13,

2-position header

Samtec

TSW-102-22-T-S

JP16, JP18

21

1

JP10

3-position, dual row header

Samtec

TSW-103-22-T-D

22

5

L1 - L5

Ferrite bead

TDK

MMZ2012R601A

23

1

R1

Resistor, 10.0

Ω

1/10W 1% 0603 SMD

Yageo

RC0603FR-0710RL

24

1

R2

Resistor, 49.9

Ω

1/10W 1% 0603 SMD

Yageo

RC0603FR-0749R9L

25

1

R3

Resistor, 100

Ω

1/10W 1% 0603 SMD

Yageo

RC0603FR-07100RL

26

1

R4, R5, R13

Resistor, 0.0

Ω

1/10W 5% 0603 SMD

Yageo

RC0603JR-070RL

27

6

R6, R9, R11, R12,

Resistor, 10.0k

Ω

1/10W 1% 0603 SMD

Yageo

RC0603FR-0710KL

R14, R15

28

1

R7

Resistor, 1.5

Ω

1/10W 5% 0603 SMD

Yageo

RC0603JR-071R5L

29

1

R8

Resistor, 15.0k

Ω

1/10W 1% 0603 SMD

Yageo

RC0603FR-0715KL

(1)

Manufacturer and part number for items may be substituted with electrically equivalent items.

(2)

Reference designators C21, C35, and JP12 are not used.

16

DAC8728EVM

SBAU161 – February 2010

Submit Documentation Feedback

Copyright © 2010, Texas Instruments Incorporated

Содержание DAC8728EVM

Страница 1: ...e circuit descriptions schematic diagrams and bills of material are included in this document The following related documents are available through the Texas Instruments web site at www ti com Related...

Страница 2: ...pply Configuration 15 List of Tables 1 J5 Analog Output Connector Pinout 3 2 J2 Parallel Interface Pins 5 3 External Logic Behavior 6 4 SN74LVC374 Control 7 5 LDAC Control 7 6 A0 and A1 Address Combin...

Страница 3: ...ety of processors Consequently access to the parallel interface is achieved through external logic controlled by the host processor parallel interface Throughout this document the acronym EVM and the...

Страница 4: ...r line decoder demultiplexer U7 on EVM This device is used to create eight control bits from the processor address that are used around the board to control various signals such as the LATCH input to...

Страница 5: ...mpletes DSP Write Strobe Signal is cycled low to J2 3 WE high within the CE strobe when a parallel bus write occurs DSP Read Strobe Signal is cycled low to J2 5 RE high within the CE strobe when a par...

Страница 6: ...nections to the SN74LVC139 Figure 1 Parallel Control Header and SN74LVC139 4 1 Required External Logic Most of TI s host processors do not have a hardware chip select that meets the timing requirement...

Страница 7: ...374 Control LATCH_CTRL WE LATCH 0 0 0 0 1 1 1 0 1 1 1 1 The final piece of external logic gives the EVM user the ability to control the LDAC signal from both the processor I O pins and the SN74LVC139...

Страница 8: ...on the 1Y0 output of the SN74LVC139 U7 The LATCH_CTRL signal is logic ORed with the WE signal to create the LATCH signal that is used to control the CLK input to the SN74LVC374 on the EVM During the...

Страница 9: ..._CS0 0 0 1 1 1 0 0 1 1 1 0 1 1 0 1 0 1 1 1 1 0 1 1 1 Table 8 Commonly Used Address Combinations A3 to A0 Hex Open1 LATCH_CTRL 0x0 DC_CS R W 0x5 LDAC LATCH_CTRL 0xC DC_CS Open2 0x7 4 10 BUSY Signal The...

Страница 10: ...d TSM 116 01 T DV to provide a convenient 16 pin dual row header socket combination at J6 This header socket combination provides access to the parallel data pins of the DAC8728 and the inputs to the...

Страница 11: ...ed from VA a 8 to 36V analog supply range When the DAC8728 is run in bipolar mode AVSS and AVDD are required AVSS can range from 4 5V to 18V and AVDD can range from 4 5V to 18V The DAC8728 AVDD VA sup...

Страница 12: ...pers JP1 and JP2 allow the user to route the DAC outputs to the input of a voltage follower amplifier that drives an RC low pass filter The capacitor is not installed and a 0 resistor connects the op...

Страница 13: ...ht binary Sets the DAC8728 to unipolar operation by routing JP14 2 3 the AVSS pin to AGND Sets the DVDD input to the DAC8728 to 3 3V from JP15 1 2 pin 10 on the J4 header Routes the OFFSET_B pin direc...

Страница 14: ...ET_B pins must be shorted directly to GND for unipolar single supply operation Table 11 Unipolar Single Supply Configuration Jumper Position JP3 JP4 JP5 JP6 JP7 JP9 1 2 JP15 JP17 JP19 JP20 JP14 2 3 JP...

Страница 15: ...dual supply operation Table 12 Bipolar Dual Supply Configuration Jumper Position JP3 JP4 JP5 JP6 JP7 JP9 1 2 JP14 JP15 JP17 JP19 JP20 JP1 JP2 JP8 JP13 JP16 JP18 Open JP11 Closed JP10 3 4 Figure 6 Bip...

Страница 16: ...r Ceramic 10mF 50V X7S 1210 Taiyo Yuden UMK325C7106MM T C27 11 3 J1 J3 J5 Top 20 pin header Samtec TSM 110 01 T DV 12 3 J1 J3 J5 Bottom 20 pin socket Samtec SSW 110 22 S D VS 13 1 J2 TERMINAL BLOCK 3...

Страница 17: ...Op Amp 8 SOP TI OPA227UA 35 1 U4 Dual Precision Op Amp 8 SOP TI OPA2277U 36 2 U5 U6 Little Logic OR Gate SOT23 5 TI SN74LVC1G32DBV 37 1 U7 Dual 2 4 Line Decoder 16 SOP TI SN74LVC139AD 38 2 U8 U12 Litt...

Страница 18: ...4 2B3 16 2B4 17 2B5 19 2B6 20 2B7 22 2B8 23 1A1 47 1A2 46 1A3 44 1A4 43 1A5 41 1A6 40 1A7 38 1A8 37 2A1 36 2A2 35 2A3 33 2A4 32 2A5 30 2A6 29 2A7 27 2A8 26 U10 SN74LVC16245A IOVDD R8 15k IOVDD EVM_A0...

Страница 19: ...oduct This notice contains important safety information about temperatures and voltages For additional information on TI s environmental and or safety programs please contact the TI application engine...

Страница 20: ...h statements TI products are not authorized for use in safety critical applications such as life support where a failure of the TI product would reasonably be expected to cause severe personal injury...

Страница 21: ...ltera Analog Devices Intersil Interpoint Microsemi Aeroflex Peregrine Syfer Eurofarad Texas Instrument Miteq Cobham E2V MA COM Hittite Mini Circuits General Dynamics 8 812 309 58 32 8 812 320 02 42 or...

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