Figures 5 and 6 illustrate the logic used to drive

connections at header JP6 (Rev. B Board) or J2

(Rev. C Board).

The Rev. C evaluation board can directly inter-

face to the CDBCAPTURE board through

connector J2. A D-type Flip-Flop must be added

in the patch area of the Rev. B evaluation board

to enable it to interface to the CDBCAPTURE

board. The CDBCAPTURE can be used to per-

form FFT analysis and noise histograms.

Tables 1 and 2 illustrate the DIP switch posi-

tions of switches S3 and S4. The switch

positions with asterisks indicate preferred set-

tin gs fo r driving th e inte rfac e on the

CDBCAPTURE system.

The CS5322 filter should be set up for hardware

mode (H/S on switch S4 open). DIP switch S4

can then be used to select the desired output

word rate.

After the selection on the DECA,

DECB, and DECC positions of the S4 DIP

switch, the S2 RESET switch must be activated,

followed by the S1 SYNC switch (unless these

signals are controlled via the J1 and J3 header

signals).

Figure 7 illustrates the component layout of the

board while figures 8 and 9 illustrate the board

layout (not to scale).

Using the Evaluation Board

Connect the appropriate power supplies to the

binding posts of the board. Twist the +5V digi-

tal supply lead with the digital ground lead from

the board to the supply. Also twist the supply

leads for the analog voltages. Use a high quality

power supply which is low in noise and line fre-

quency(50/60 Hz) interference.

Power up the supplies. Then connect a coaxial

cable from the analog BNC to the signal source.

Note that the performance of the A/D converter

chip set will exceed the capability of most signal

generators, with respect to noise, distortion, and

line frequency interference.

SCLK

SOD

DRDYD

+5V

+5V

J2

10

10

µF

+

+5 V

R4

C5

DRDYD

SOD

SCLK

14

2

3

14

4

13

D

CL

Q

D

CL

U10 74HC74

12

11

Q

10

7

+5

+5

+5

+5

5

1

DRDY

SCLK

SOD

From

Figure 4

98

56

13

12

1

2

11

10

3

4

U4 74HC04

Figure 6. Serial Latch Interface on CDB5321 (Rev C) board.

CDB5321

DS88DB2

21