CS5317 datasheet(27/32 Pages) CIRRUS

27 / 32 page

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.

CIRCUIT DESCRIPTION

Figure 2 illustrates the CS5317 A/D converter IC

circuit connections. The chip operates off of

±5V.

These voltages are supplied from a power source

external to the evaluation board.

Binding posts

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

and ground power lines. A good quality low rip-

p le, low no ise su pp ly will giv e 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

CLKIN

GND

-5V

AIN

TP10

R11

C13

C12

CLKG1

CLKG2

CLKOR

CLKIN (fig.6)

µF

TP9

C18

C16

µF

6.8v

TP7

TP8

R1*

200

10k

CS5317

+5V

C19

C17

R10

6.8v

0.22

µF

VA+

VD+

0.1

µF

10 k

CLKOUT

DATA

DOUT

(fig. 3)

10 k

0.1

µF

C15

0.1

µF

0.1

µF

C14

TP6

0.1

µF

VA-

VD-

0.1

µF

* Remove for logic gate CLKIN source

DGND

CLKOUT

DATA

MODE

RST

DOE

DOUT

AIN

CLKIN

AGND

REFBUF

PHDT

VCOIN

1.2k

0.01

µF

NPO

Figure 2. Analog-to-Digital Converter

CDB5317

DS27DB3

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