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Texas Instruments ADS8472EVM, Руководство пользователя

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Texas Instruments ADS8472EVM Скачать руководство пользователя страница 17

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ti

12500 TI Boulevard.  Dallas, Texas 75243

TITLE:

SHEET:

OF:

FILE:

SIZE:

REV:

Drawn By:

Engineer:

Revision History

REV

ECN Number

Approved

DOCUMENT CONTROL #:

2

3

Analog-to-Digital Converter

A

DATE:

31-Jan-2009

Analog-to-Digital Converter 

6485904

C32

1000pF

C5

1uF

C22

2.2uF

C30

1000pF

C34

1000pF

C23

2.2uF

C26

2.2uF

C35

1000pF

C27

2.2uF

C36

1000pF

+5VCC

+5VCC

+5VCC

+5VCC

C20

2.2uF

C28

1000pF

+5VCC

C21

2.2uF

C29

1000pF

+VBD

B_CS
B_RD
B_CONVST
B_BYTE

BUSY

B_BUS18/16

+VBD

DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
DB8
DB9

D

B

1

0

D

B

1

1

D

B

1

2

D

B

1

3

D

B

1

4

D

B

1

5

C31

1000pF

C24

2.2uF

+5VCC

BUSY

DB[17...0]

B_CS
B_RD

B_BYTE

B_CONVST

B_BUS18/16

D

B

[1

7

...

0

]

3

1

2

SJP2

C6

22uF

R33

0

C25

2.2uF

C33

1000pF

R1

49.9

Lijoy Philipose
Lijoy Philipose

C37
47uF

+VCC

-VCC

C9

0.1uF

C10

0.1uF

R27

300

R4

300

3

2

1

8

4

U4A

THS4032

5

6

7

U4B

THS4032

R28

NI

R29

300

C3
NI

C38
NI

C4

NI

C39

NI

R16

0

R6
NI

-VCC

+VCC

C13

0.1uF

C14

0.1uF

3

2

6

7

4

5

1

8

U7

THS4031

3

2

6

7

4

5

1

8

U6

THS4031

C12 0.1uF

C11

0.1uF

+VCC

-VCC

R9

NI

-IN

+IN

R37

1k

R21

1k

R35

NI

R31 1k

R32

NI

1

2

SJP5

-DC

R38

75

R36

75

+DC

R20

NI

R34

NI

R12

NI

R18
NI

R7

NI

R39

5.1

R40

5.1

C45
2200pF

C47
NI

C46
NI

R19

0

R22

0

*

*

*C0G*

*

*

C41

1uF

C42

1uF

R8

1k

R26

33

C19

NI

C18

NI

R25

33

+DC

-DC

R2

49.9

R3

49.9

C44

NI

C43

NI

R17

0

+

V

B

D

1

B

U

S

1

8

/1

6

2

B

Y

T

E

3

C

O

N

V

S

T

4

R

D

5

C

S

6

+

V

A

7

A

G

N

D

8

A

G

N

D

9

+

V

A

1

0

R

E

F

M

1

1

R

E

F

M

1

2

REFIN

13

REFOUT

14

NC

15

+VA

16

AGND

17

+IN

18

-IN

19

AGND

20

+VA

21

+VA

22

AGND

23

AGND

24

+

V

A

2

5

A

G

N

D

2

6

A

G

N

D

2

7

D

B

1

7

2

8

D

B

1

6

2

9

D

B

1

5

3

0

D

B

1

4

3

1

D

B

1

3

3

2

D

B

1

2

3

3

D

B

1

1

3

4

D

B

1

0

3

5

+

V

B

D

3

6

BDGND

37

DB9

38

DB8

39

DB7

40

DB6

41

DB5

42

DB4

43

DB3

44

DB2

45

DB1

46

DB0

47

BUSY

48

U5

ADS8472

D

B

1

6

D

B

1

7

EXT_REF

3

1

2

SJP1

J3

J4

3

1

2

SJP3

3

1

2

SJP4

R10

NI

R13

NI

R24

10K

1

2

SJP6

C40

10uF

+5VCC

C1

0.47uF

GND_F

1

GND_S

2

ENABLE

3

IN

4

OUT_S

5

OUT_F

6

U1

REF3230

+5VCC

C2

0.47uF

GND_F

1

GND_S

2

ENABLE

3

IN

4

OUT_S

5

OUT_F

6

U2

REF3240

NC

1

+VIN

2

EN

3

GND

4

NC

5

VREF

6

NC

7

NC

8

U3

NI

C8
NI

+5VCC

C7

1uF

**VRE4141**

R5

33

R11

NI

Содержание ADS8472EVM

Страница 1: ...BoM 10 8 ADS8472EVM Layout 12 9 ADS8472EVM Schematic 15 List of Figures 1 Input Buffer Bipolar Fully Differential Input 4 2 Top Layer 1 12 3 Ground Plane Layer 2 13 4 Power Plane Layer 3 13 5 Bottom Layer 4 14 6 Top Overlay 14 7 Bottom OverLay 15 List of Tables 1 Analog Input Connector 3 2 Analog Circuitry Jumper Configurations 4 3 Pinout for Parallel Control Connector P3 5 4 Jumper Settings 5 5 D...

Страница 2: ...ation register SAR converter with an inherent sample and hold The ADS8472 has a 16 bit and 8 bit parallel interface bus options allowing a variety of processors to interface easily with it The ADS8472EVM is an evaluation and demonstration platform for the ADS8472 ADC The board is a flexible design that allows the user to choose among many different analog signal conditioning reference and interfac...

Страница 3: ...s resistor to filter the input signal behaves like a charge reservoir and provides a path to ground for high frequency noise and the low small input current transient which occurs when the device switches from hold to sample mode This external filter capacitor works with the amplifier to charge the internal sampling capacitor during sampling mode The supplies to the input amplifier are selectable ...

Страница 4: ...minus rail supply to ground Not Installed Installed 1 Set U6 operational amplifier minus rail supply to VCC SJP4 Installed Not Installed Set U7 operational amplifier minus rail supply to ground Not Installed Installed 1 Set U7 operational amplifier minus rail supply to VCC SJP5 Not Installed N A Short voltage node DC to U6 pin 2 via R35 SJP6 Not Installed N A Short IN pin of U5 to ground at C45 1 ...

Страница 5: ...cal when measuring large amplitude and or high frequency input signals the user provide a clean low jitter convert start pulse The convert start signal can be applied to the ADS8472 from the decoder outputs or from connector P3 pin 17 Address decoder SN74ACH138 is used to generate the read RD and conversion start CONVST signals to the converter Jumpers W3 and W4 allow the user to assign these two ...

Страница 6: ...GND Ground Data Bit 12 DB12 P2 29 P2 30 GND Ground Data Bit 13 DB13 P2 31 P2 32 GND Ground Data Bit 14 DB14 P2 33 P2 34 GND Ground Data Bit 15 DB15 P2 35 P2 36 GND Ground In addition to interfacing to the various micro controller and digital signal processors from Texas Instruments this board also plugs into the TSW1100 card The TSW1100 is a PC based data capture card J7 connector is installed to ...

Страница 7: ...ccepts four power supplies A dual VA DC supply for the dual supply op amps Recommend 6VDC supply A single 5 0 V DC supply for analog section of the board A D Reference A single 5 0V or 3 3V DC supply for digital section of the board A D address decoder buffers There are two ways to provide these voltages 1 Wire in the voltages at test points on the EVM See Table 8 Table 8 Power Supply Test Points ...

Страница 8: ...ply voltage can be applied at test point TP4 or at connector J5 pin 1 There are two common methods to evaluate the ADS8472EVM s performance 1 EVM used as a stand alone system The user is responsible for capturing and analyzing the data typically via a logic analyzer and analysis software LABView MATLAB etc 2 EVM used in conjunction with TI s TSW1100 data capture card http focus ti com docs toolsw ...

Страница 9: ...e the 5 6K Interface Board user s guide SLAU104 For the software engineer the ADS8472EVM provides a simple platform for interfacing to the converter The EVM provides standard 0 1 inch headers and sockets to wire into prototype boards The user need only provide three address lines A2 A1 and A0 and address valid line DC_CS to connector P3 To select which address combinations generate RD and CONVST s...

Страница 10: ...anasonic ERJ 3EKF1002V RES 10 0kΩ 1 10W 1 0603 SMD ECG or Alternate 1 10k R46 805 Panasonic ERJ 6GEYJ103V RES 10kΩ 1 8W 5 0805 SMD ECG or Alternate 2 NI R6 R28 603 Not Installed Not Installed 11 NI R7 R9 R13 805 Not Installed Not Installed R18 R20 R32 R34 R35 2 47 RP1 RP2 CTS_742 CTS 742C163470JTR RES ARRAY 47Ω 16TERM 8RES SMD Corporation 1 1K RP3 CTS_742 CTS 742C163102JTR RES ARRAY 1kΩ 16TERM 8RE...

Страница 11: ...8472 U5 48 QFN RGZ Texas ADS8472IBRGZR ADS8472 16 bit 1MSPS A D Instruments 2 THS4031 U6 U7 8 SOP D Texas THS4031IDR 100 MHz Low noise high speed amplifier Instruments 4 SN74AHC U8 U11 20 TSSOP PW Texas SN74AHC245PWR Octal Bus Transceiver 3 State 245PWR Instruments 1 SN74AHC U12 5 SOT DBV Texas SN74AHC1G04DBVR Single Inverter Gate 1G04DBV Instruments 1 SN74AHC U13 16 TSSOP PW Texas SN74AHC138PWR 3...

Страница 12: ...PER 1 2POS_JU W5 2pos_jump Samtec TSW 102 07 L S 2 Position Jumper _ 0 1 spacing MPER 8 TP_0 025 TP3 TP7 TP9 test_point2 Keystone 5000K ND TEST POINT PC MINI 0 040 D RED TP11 TP12 Electronics 6 TP_0 025 TP1 TP2 TP8 test_point2 Keystone 5001K ND TEST POINT PC MINI 0 040 D BLACK TP10 TP13 Electronics TP14 This section contains the EVM layout Figure 2 Top Layer 1 12 ADS8472EVM SLAU203 February 2007 S...

Страница 13: ...www ti com ADS8472EVM Layout Figure 3 Ground Plane Layer 2 Figure 4 Power Plane Layer 3 SLAU203 February 2007 ADS8472EVM 13 Submit Documentation Feedback ...

Страница 14: ...ADS8472EVM Layout www ti com Figure 5 Bottom Layer 4 Figure 6 Top Overlay 14 ADS8472EVM SLAU203 February 2007 Submit Documentation Feedback ...

Страница 15: ...9 ADS8472EVM Schematic www ti com ADS8472EVM Schematic Figure 7 Bottom OverLay Schematic diagram pages are appended to this user s guide SLAU203 February 2007 ADS8472EVM 15 Submit Documentation Feedback ...

Страница 16: ... 2 3 4 5 6 7 8 9 10 J5 VA VA 5VD AGND 5VA DGND 3 3VD W1 Lijoy Philipose Lijoy Philipose 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 P3 Parallel Control INTC A1 DC_CS A2 ADC Data Bus 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 35 35 36 36 P2 B_DB0 B_DB...

Страница 17: ... 0 R6 NI VCC VCC C13 0 1uF C14 0 1uF 3 2 6 7 4 5 1 8 U7 THS4031 3 2 6 7 4 5 1 8 U6 THS4031 C12 0 1uF C11 0 1uF VCC VCC R9 NI IN IN R37 1k R21 1k R35 NI R31 1k R32 NI 1 2 SJP5 DC R38 75 R36 75 DC R20 NI R34 NI R12 NI R18 NI R7 NI R39 5 1 R40 5 1 C45 2200pF C47 NI C46 NI R19 0 R22 0 C0G C41 1uF C42 1uF R8 1k R26 33 C19 NI C18 NI R25 33 DC DC R2 49 9 R3 49 9 C44 NI C43 NI R17 0 VBD 1 BUS18 16 2 BYTE ...

Страница 18: ... OE DIR A1 A2 A3 A4 A5 A6 A7 A8 B1 B2 B3 B4 B5 B6 B7 B8 VCC GND U8 SN74AHC245PWR VBD C66 0 1uF CS RD CONVST BYTE R42 10k R43 10k R44 10k VBD R45 10k R41 10k BUSY B_CS B_RD B_CONVST B_BYTE B_BUS18 16 DB 17 0 B_DB 17 0 B_CS B_BYTE B_CONVST B_RD B_BUS18 16 2 4 5 3 U12 SN74AHC1G04DBV VBD C68 0 1uF W2 INTc Lijoy Philipose Lijoy Philipose A 1 B 2 C 3 G1 6 G2A 4 G2B 5 Y0 15 Y1 14 Y2 13 Y3 12 Y4 11 Y5 10 ...

Страница 19: ...prior to handling the product 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 engineer or visit www ti com esh No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine process or combination in...

Страница 20: ...ice TI is not responsible or liable for any such 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 or death unless officers of the parties have executed an agreement specifically governing such use Buyers represent that they have all necessary expertis...

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