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CDB5317

amplitude so that distortion products become neg-

ligible. This allows an accurate measurement of

the noise floor.

More complex analysis such as intermodulation

distortion measurements can be accomplished

with the addition of another sine-wave generator.

are supplied on the board to connect the +5, -5,

and ground power lines. A good quality low rip-

ple, low noise supply will give the best

performance. The +5 V supply can also be used

for VL and should be connected between the VL

board jack and the power supply, as opposed to

connecting the VL jack straight to the +5V jack.

The +5V jack is the positive power source for the

CS5317 IC whereas the VL jack supplies power

to all the digital ICs. Care should be taken that

noise is not coupled between VL and +5V; how-

ever, supply noise is generally not a problem with

the CS5317 since the on-chip decimation filter

will remove any interference outside of its pass-

band. The +5 and -5 V supply lines are filtered on

CIRCUIT DESCRIPTION

Figure 2 illustrates the CS5317 A/D converter IC

circuit connections. The chip operates off of

鹵5V.

These voltages are supplied from a power source

external to the evaluation board. Binding posts

TP6

VL

D1

TP10

+5V

6.8v

D3

C19

C17

0.22碌F

R10

10k

R2

200

R1*

51

AIN

R11

1.2k

C18

0.01

碌F

NPO

TP8

C9

10碌F

C8

0.1

碌F

1

VA+

C5

C4

VL

0.1

碌F

10

碌F

R7

10

2

VD+

3

+ C6

10

碌F

R5

10 k

DOUT (fig. 3)

CLKOUT (fig. 3)

DATA (fig. 3)

R6

10 k

C7

0.1

碌F

17

PHDT

18

VCOIN

9

CLKIN

DOE

CLKIN

CLKIN (fig.6)

11

U6

AIN

8

DOUT

5

CLKOUT

6

DATA

16

RST

R9

10 k

12 REFBUF

C14

0.1

碌F

15

AGND

VA-

14

R8

10

C15

MODE

7

CLKG1

CLKG2 P2

CLKOR

TP7

GND

D2

TP9

-5V

C16

CS5317

DGND

VD-

10

4

C13

C12 +

10

碌F

6.8v

10碌F 0.1

碌F

0.1

碌F

* Remove for logic gate CLKIN source

Figure 2. Analog-to-Digital Converter

DS27DB3

27

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