6

®

DEM-ADS7843E/45E

FIGURE 1a. ADS7843E and ADS7845E Evaluation Demo Board Analog Circuit Diagram.

+5V

+5V

+5V

Analog Workspace

Bypass Capacitors

C

14

0.10

µF

50V

10%

C

15

0.10

µF

50V

10%

C

16

0.10

µF

50V

10%

1

3

5

7

9

Dout

Din

Dclk

CS

Busy/Sync

C

20

0.10

µF

50V

10%

C

21

0.10

µF

50V

10%

C

22

0.10

µF

50V

10%

C

23

0.10

µF

50V

10%

C

24

0.10

µF

50V

10%

C

25

0.10

µF

50V

10%

JP4

R

2 100Ω

2

1

2

1

2

1

0.125W 1%

R

4 100Ω

0.125W 1%

R

6 100Ω

0.125W 1%

J2

J2A

J2B

+5V

JP10

JP11

JP2

JP1

+5V

U1

REF1004-1.2

REF1004-2.5

NC1

NC2

CATHODE 2

CATHODE 1

NC3

ANODE

NC5

NC4

1

2

3

4

8

6

7

5

NC1

NC2

CATHODE 2

CATHODE 1

NC3

ANODE

NC5

NC4

1

2

3

4

8

6

7

5

U2

1

3

5

2

4

6

+5V

10

11

U6

74HC040

+5V

R

18

100k

Ω

0.125W

1%

R

11

10.0k

Ω

0.125W

1%

R

13

1.0k

Ω

0.125W

1%

R

15

22.1

Ω

0.125W

1%

C

11

10

µF

16V

10%

C

12

0.10

µF

50V

10%

R

14

1.0k

Ω

0.125W

1%

R

16

22.1

Ω

0.125W

1%

C

8

0.1

µF

50V

10%

R

8

100k

Ω

0.125W

1%

R17

681

Ω

0.125W

1%

C

1

2.2

µF

16V

10%

C2

0.01

µF

50V

10%

LED

HLMP-3201

RED

C13 10µF

16V 10%

1

J4

JP9

1

2

3

4

5

6

7

8

X+

Y+

X–

Y–

IN3

IN4

V

CC

X+

Y+

X–

Y–

GND

IN3

IN4

Dclk

CS

Din

Busy

Dout

Penirq

V

CC

V

REF

16

15

14

13

12

11

10

9

+5V

31

2

+5V

2

R9 0Ω

R10 0Ω

R7 0Ω

R3 0Ω

R5 0Ω

C3

C4

C5

C6

C9

C10

R12 0Ω

DUT socket may

be used or part

may be soldered

directly to PCB

DUT1

OTS-16(24)-0.635-02

User Supply Input

IN4

IN3

Y–

X–

Y+

X+

GND

GND

GND

1

2

J1B

1

2

J1A

1

2

J1