AD9832 Analog Devices, AD9832 Datasheet - Page 15

• Manufacturer Part Number: AD9832
• Description: CMOS Complete DDS
• Manufacturer: Analog Devices

REV. A
Using the AD9832 Evaluation Board
The AD9832 Evaluation kit is a test system designed to simplify
the evaluation of the AD9832. Provisions to control the AD9832
from the printer port of an IBM-compatible PC are included,
along with the necessary software. An application note is also
available with the evaluation board and gives information on
operating the evaluation board.
Prototyping Area
An area is available on the evaluation board for the user to add
additional circuits to the evaluation test set. Users may want to
build custom analog filters for the output or add buffers and
operational amplifiers to be used in the final application.
Integrated Circuits
XTAL1
U1
U2
Capacitors
C1, C2
C3, C4
C5, C6, C7, C9
C8, C10
Resistors
R1–R3
R4
R5
R6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
SCLK
SDATA
FSYNC
PSEL1
SW
PSEL0
MCLK
OSC XTAL 25 MHz
AD9832 (16-Pin TSSOP)
74HCT244 Buffer
0.1 F Ceramic Chip Capacitor
10 nF Ceramic Capacitor
0.1 F Ceramic Capacitor
10 F Tantalum Capacitor
10 k Resistor
50
3.9 k Resistor
300
R4
50
FSELECT
R2
10k
Resistor
Resistor
DVDD
0.1 F
R1
10k
SDATA
FSYNC
C5
J1
SCLK
DVDD
R3
10k
DVDD
DGND
U3
LK3
Figure 31. AD9832 Evaluation Board Layout
DVDD
0.1 F
OUT
C6
LK2
11
XTAL1
4
6
1 10 19
U2
LK1
20
16
14
9
11
12
10
7
8
9
6
DVDD
SCLK
SDATA
FSYNC
PSEL1
PSEL0
FSELECT
MCLK
0.1 F
–15–
C1
XO vs. External Clock
The AD9832 can operate with master clocks up to 25 MHz. A
25 MHz oscillator is included on the evaluation board. How-
ever, this oscillator can be removed and, if required, an external
CMOS clock connected to the part.
Power Supply
Power to the AD9832 Evaluation Board must be provided ex-
ternally through the pin connections. The power leads should be
twisted to reduce ground loops.
Links
LK1–LK3
LK4
Switch
SW
Sockets
MCLK, PSEL0,
PSEL1, FSELECT,
IOUT, REFIN
Connectors
J1
J2, J3
DGND
DVDD
5
4
AD9832
U1
15
AVDD
AGND
FSADJUST
13
REFOUT
C2
0.1 F
COMP
REFIN
IOUT
AVDD
16
2
3
1
14
LK4
C4
10nF
Three-Pin Link
Two-Pin Link
End Stackable Switch (SDC Double
Throw)
Subminiature BNC Connector
36-Pin Edge Connector
PCB Mounting Terminal Block
R5
3.9k
AVDD
10 F
C3
10nF
REFIN
C8
300
R6
DVDD
C7
0.1 F
IOUT
J2
J3
AD9832
0.1 F
AVDD
C9
C10
10 F