7

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DEM-ADS7843E/45E

FIGURE 1b. ADS7843E and ADS7845E Evaluation Demo Board Digital Circuit Diagram.

74HC393D

1

3

5

7

9

11

13

15

2

4

6

8

10

12

14

16

1

3

5

7

9

11

13

15

17

2

4

6

8

10

12

14

16

18

19

21

23

25

27

29

31

33

20

22

24

26

28

30

32

34

35

37

39

41

43

45

47

49

36

38

40

42

44

46

48

50

DVALID

(Low)

(Low)

(Low)

(Low)

LSB

Q0

Q1

Q2

Q3

Q4

Q5

Q6

Q7

Q17

SER

RCK

SRCLR

SRCK

RCLR

14

12

10

11

13

JP3

QA

QB

QC

QD

CLK

CLR

U3

+5V

+5V

+5V

QH

U8

8

Din 13

Din 13

9

21

43

Dclk

U4

Dclk

TTLOsc/10 = DUTCLK/(16-24) = Convert

32MHz/10 = 3.2MHz/16 = 200kHz

U4

3

4

5

6

1

2

4

5

6

3

74HC08D

MC74HC390D

MC74HC390D

U15

U3

74HC08D

U4

9

10

8

Busy/Sync

74HC166D

74HC08D

74HC393D

74HC08D

74HC393D

U6

74HC04D

U6

74HC04D

U6

74HC04D

74HC393D

1

2

R

1

10k

Ω

0.125W

1%

QA

QB

QC

QD

CLK

CLR

11

10

9

8

13

12

QA

QB

QC

QD

CLK

CLR

3

4

5

6

1

2

74HC393D

Dclk

QA

QB

QC

QD

CLK

CLR

3

4

5

6

9

15

6

7

1

2

3

4

5

10

11

12

14

CL

SH/LD

CKINH

CK

SER

A

B

C

D

E

F

G

H

1

2

74HC393D

U6

74HC04D

QA

QB

QC

QD

CLK

CLR

11

10

9

8

15

1

2

3

4

5

6

7

9

PD0

PD1

SER/DFR

MODE

A0

A1

A2

START

13

5

U13

U14

SN74HC594D

6

J3

U6

74HC04D

13

12

12

QA

QB

QC

QD

CLK

CLR

3

4

5

6

12

13

1

1

13

2

7

14

+5V

JP5

8

32MHz

Y1

11

2

JP7

U4

13

2

JP8

13

JP6

+5V

+5V

RN2

100k

Ω

RN1

10k

Ω

1

2345 6

789

10 987 6

5432

1

Dclk

P1

External

Clk Input

1

2

3

2

QA

QB

QC

QD

CKA

CKB

CLR

NC

GND

+5V

OUT

3

5

6

7

1

4

2

U15

U5

U5

U7

U7

QA

QB

QC

QD

CLR

13

11

10

9

PD0

PD1

SER/DFR

MODE

A0

A1

A2

START

15

12

14

Q0

Q1

Q2

Q3

Q4

Q5

Q6

Q7

Q17

SER

RCK

SRCLR

SRCK

RCLR

14

12

10

11

13

15

1

2

3

4

5

6

7

9

SN74HC594D

Spares

MSB

Digital Workspace

Dout

Din

Dclk

CS

Busy/Sync

CKA

CKB

POWER

GROUND

BYPASS CAP

REF. DES.

DEVICE

PIN

PIN

REF. DES.

U1

REF1004-1.2

N/A

4

N/A

U2

REF1004-2.5

N/A

4

N/A

U3, U5, U7

74HC393N

16

8

C14, C15, C16

U4

74HC08N

14

7

C20

U6

74HC04N

14

7

C21

U8

74HC166N

16

8

C22

U13, U14

74HC594N

16

8

C23, C24

U15

74HC390N

16

8

C25

POWER AND GROUND CHART