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Texas Instruments ADS8381EVM User Manual Download Page 29

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ti

12500 TI Boulevard.  Dallas, Texas 75243

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Revision History

REV

ECN Number

Approved

DOCUMENT CONTROL #:

2

3

Analog-to-Digital Converter

A

DATE:

6-May-2004 

ADS8381/ADS8383EVM Analog Circuits

6448017

C21

0.01uF

C43

0.1uF

C42
0.1uF

C48

0.01uF

C41

0.01uF

C47

0.1uF

C52

0.1uF

C44

0.01uF

C55

0.1uF

C56

0.01uF

+5VCC

+5VCC

+5VCC

+5VCC

C54

0.1uF

C50

.01uF

+5VCC

C51

0.1uF

C53

0.01uF

+VBD

B_CS
B_RD
B_CONVST
B_BYTE

BUSY

B_BUS18/16

+VBD

DB0

DB1
DB2

DB3

DB4

DB5

DB6

DB7

DB8
DB9

DB10

DB11

DB12

DB13

DB14

DB15

DB16

DB17

C46

0.01uF

C40

0.1uF

+5VCC

BUSY

DB[17...0]

B_CS
B_RD

B_BYTE

B_CONVST

B_BUS18/16

-VCC

+VCC

+IN

NC

1

+VIN

2

EN

3

GND

4

NC

5

VREF

6

NC

7

NC

8

U9

SOIC-8 Footprint

+5VCC

C18

NI

C45

NI

C17

47uF

EXT_REF

R14

100

+VCC

C16
1uF

C36
0.1uF

-VCC

IN

1

OUT

2

GND

3

U3

REF3040

+5VCC

DB[17...0]

TP4

3

1

2

SJP1

3

1

2

SJP2

1

2

SJP3

R15

100

+

C49
10uF

IN

1

OUT

2

GND

3

U10

NI

C61
NI

C62

NI

+5VCC

C60

NI

C63
0.47uF

R13

10

C39
6800pF

C35

NI

R5

NI

R4

0

R6

1000

R11

NI

R10

1000

C31

1uF

C7
0.1uF

C33

0.22uF

C37
1uF

C15
0.1uF

R21

0

C13

NI

R3

NI

C8
1uF

C32
0.1uF

C64
0.1uF

C65
0.01uF

REFIN

1

BIAS

2

NC

3

+VA

4

AGND

5

+IN

6

-IN

7

AGND

8

+VA

9

+VA

10

AGND

11

AGND

12

AGND

14

AGND

15

DB17

16

DB16

17

DB15

18

DB14

19

DB13

20

DB12

21

DB11

22

DB10

23

+VBD

24

BDGND

25

DB9

26

DB8

27

DB7

28

DB6

29

DB5

30

DB4

31

DB3

32

DB2

33

DB1

34

DB0

35

BUSY

36

+VA

37

BUS18/

16

38

BYTE

39

CONVST

40

RD

41

CS

42

+VA

43

AGND

44

AGND

45

+VA

46

REFM

47

REFM

48

+VA

13

U4

ADS8381

Lijoy Philipose
Lijoy Philipose

R23

10k

1

2

SJP4

TP9

R24

49.9

R25

NI

*

*

*

*

3

2

6

7

4

 

5

 

1

U1

OPA627

3

1

2

SJP6

3

1

2

SJP5

3

2

6

7

4

5

1

8

U2

THS4031

C30

NI

*

R1

0

R2

NI

Summary of Contents for ADS8381EVM

Page 1: ...ADS8381EVM May 2004 Data Acquistion User s Guide SLAU133...

Page 2: ...itute a license from TI to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual p...

Page 3: ...handling or use of the goods Please be aware that the products received may not be regulatory compliant or agency certified FCC UL CE etc Due to the open construction of the product it is the user s r...

Page 4: ...there is uncertainty as to the load specification please contact a TI field representative During normal operation some circuit components may have case temperatures greater than 60 C The EVM is desi...

Page 5: ...Chapter 3 Digital Interface Chapter 4 Power Supply Requirements Chapter 5 Using the EVM Chapter 6 ADS8381EVM BOM Layout and Schematic Related Documentation From Texas Instruments To obtain a copy of a...

Page 6: ...t J of part 15 of FCC rules which are designed to provide reasonable protection against radio frequency interference Operation of this equipment in other en vironments may cause interference with radi...

Page 7: ...erence 2 3 3 Digital Interface 3 1 4 Power Supply Requirements 4 1 5 Using the EVM 5 1 5 1 As a Reference Board 5 2 5 2 As a Prototype Board 5 2 5 3 As a Software Test Platform 5 2 6 ADS8381EVM BOM La...

Page 8: ...er Layer 4 6 6 Tables 2 1 Analog Input Connector 2 1 2 2 Solder Short Jumper Setting 2 3 3 1 Pinout for Parallel Control Connector P2 3 1 3 2 Jumper Settings 3 2 3 3 Data Bus Connector P3 3 2 3 4 Pino...

Page 9: ...1 1 EVM Overview EVM Overview This chapter contains the features of the ADS8381EVM Topic Page 1 1 Features 1 1 Chapter 1...

Page 10: ...aluation board for the high speed ADS8381 18 bit single channel parallel interface SAR type analog to digital converters Onboard signal conditioning Onboard reference Input and output digital buffer O...

Page 11: ...the center pin of SMA connector J2 Table 2 1 Analog Input Connector Description Signal Name Connector Pin Signal Name Description Pin tied to Ground AGND P1 1 P1 2 Noninverting Input Channel Reserved...

Page 12: ...elected such that ADS8381EVM meets the 100 kHz AC performance specifications listed in the data sheet The series resistor works with the capacitor to filter the input signal but also isolates the ampl...

Page 13: ...via P1 pin 20 See Table 2 2 for jumper settings See Chapter 6 for the full schematic Table 2 2 Solder Short Jumper Setting Reference Jumper Setting Reference Designator Description 1 2 2 3 SJP1 Select...

Page 14: ...2 4...

Page 15: ...A1 Address line from processor P2 11 A2 Address line from processor P2 13 P2 15 P2 17 P2 19 INTc Set jumper W3 to select BUSY or inverted signal to be applied to this pin Note All even numbered pins o...

Page 16: ...ered Data Bit 6 P3 15 D7 Buffered Data Bit 7 P3 17 D8 Buffered Data Bit 8 P3 19 D9 Buffered Data Bit 9 P3 21 D10 Buffered Data Bit 10 P3 23 D11 Buffered Data Bit 11 P3 25 D12 Buffered Data Bit 12 P3 2...

Page 17: ...l Description TP16 BVDD Apply 3 3 V or 5 0 V See ADC data sheet for full range TP20 AVCC Apply 5 0 V TP14 VA Apply 6 0 V Positive supply for amplifier TP18 VA Apply 6 0 V Negative supply for amplifier...

Page 18: ...4 2...

Page 19: ...The ADS8381EVM serves three functions 1 As a reference design 2 As a prototype board and 3 As software test platform Topic Page 5 1 As a Reference Board 5 2 5 2 As a Prototype Board 5 2 5 3 As a Softw...

Page 20: ...shorts the minus supply pin of the amplifier to ground Positive supply voltage can be applied via test point TP14 or connector J1 pin 1 5 3 As a Software Test Platform As a software test platform con...

Page 21: ...ic ADS8381EVM BOM Layout and Schematic This chapter contains the ADS8381EVM bill of materials the layouts and the schematic Topic Page 6 1 ADS8381EVM Bill of Materials 6 2 6 2 ADS8381EVM Layout 6 5 6...

Page 22: ...805 Not installed Not installed R2 1 NI 805 Not installed Not installed R6 R10 2 1k 805 Panasonic ECG or Alternate ERJ 6ENF1001V 1 00 k 1 10W 1 0805 SMD R16 R17 R18 R19 R20 5 10k 603 Panasonic ECG or...

Page 23: ...V 10 SMT C17 1 47 F 1206 TDK Corporation or Alternate C3216X5R0J476M Capacitor CER 47 F 6 3 V X5R 20 1206 C13 C18 C45 C60 C61 5 NI 603 Not installed Not installed C30 C35 R5 3 NI 805 Not installed No...

Page 24: ...01 Right Angle SMA Connector J4 1 6X2X 1 6X2X 1_SMT _plug_ _soc Samtec SSW 106 22 S D VS 0 025 SMT Socket bottom side of PWB ket Samtec TSM 106 01 T D V P 0 025 SMT PLUG top side of PWB P3 1 18X2X 1_...

Page 25: ...ADS8381EVM Layout 6 5 ADS8381EVM BOM Layout and Schematic 6 2 ADS8381EVM Layout Figure 6 1 Top Layer Layer 1 Figure 6 2 Ground Plane Layer 2...

Page 26: ...ADS8381EVM Layout 6 6 Figure 6 3 Power Plane Layer 3 Figure 6 4 Bottom Layer Layer 4...

Page 27: ...ADS8381EVM Schematic 6 7 ADS8381EVM BOM Layout and Schematic 6 3 ADS8381EVM Schematic The schematic follows this page...

Page 28: ...13 14 15 16 17 18 19 20 P1 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 3...

Page 29: ...8 Footprint 5VCC C18 NI C45 NI C17 47uF EXT_REF R14 100 VCC C16 1uF C36 0 1uF VCC IN 1 OUT 2 GND 3 U3 REF3040 5VCC DB 17 0 TP4 3 1 2 SJP1 3 1 2 SJP2 1 2 SJP3 R15 100 C49 10uF IN 1 OUT 2 GND 3 U10 NI C...

Page 30: ...DIR A1 A2 A3 A4 A5 A6 A7 A8 B1 B2 B3 B4 B5 B6 B7 B8 VCC GND U8 SN74AHC245PWR C59 0 1uF B_RD DB 17 0 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 B_DB17 B_DB16 B_DB1...

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