AD7008JP50 Analog Devices Inc, AD7008JP50 Datasheet - Page 15

• Manufacturer Part Number: AD7008JP50
• Description: IC CMOS DDS MODULATOR 44-PLCC
• Manufacturer: Analog Devices Inc

Specifications of AD7008JP50

• Rohs Status: RoHS non-compliant
• Noise Floor: *
• Voltage - Supply: 5V
• Package / Case: 44-LCC

REV. B
AD7008/PCB DDS EVALUATION BOARD
The AD7008/PCB DDS Evaluation Board allows designers to
evaluate the high performance AD7008 DDS Modulator with a
minimum amount of effort.
To prove this DDS will meet the user’s waveform synthesis re-
quirements, the only things needed are the AD7008/PCB DDS
Evaluation Board, +5 V power supply, an IBM-compatible PC,
and a spectrum analyzer. The evaluation setup is shown below.
The DDS evaluation kit includes a populated, tested AD7008/
PCB board; software which controls the AD7008 through the
parallel printer port in a DOS or Windows environment and an
AD7008P.
The AD7008 direct digital synthesis chip is a numerically
controlled oscillator employing a 32-bit phase accumulator, sine
and cosine look-up tables, and a l0-bit D/A converter integrated
on a single CMOS chip. Modulation capabilities are provided
for phase modulation, frequency modulation, and both in-phase
and quadrature amplitude modulation suitable for SSB
generation.
Clock rates up to 20 MHz and 50 MHz are supported. Fre-
quency accuracy can be controlled to one part in four billion.
Characteristics
+5.0 V Supply Current
AD7008 Output Voltage
CMOS clock input HIGH
CMOS clock input LOW
USING THE AD7008/PCB DDS EVALUATION BOARD
The AD7008/PCB evaluation kit is a test system designed to
simplify the evaluation of the AD7008 50 MHz Direct Digital
Synthesizer. Provisions to control the AD7008 from the printer
port of an IBM-compatible PC are included, along with the
STANDARD
(Terminated into 50
Table IV. AD7008/PCB Typical Electrical Characteristics
PRINTER
GENERATOR
CABLE
REFERENCE
TTL CLOCK
OPTIONAL
Figure 35. AD7008 DDS Evaluation Board Setup
SOFTWARE
PROVIDED
(Nominal power supplies, CLK = 50 MHz)
AD7008 DDS EVALUATION BOARD
IBM-COMPATIBLE PC
OSCILLATOR
INTERFACE
CLOCK
LOGIC
Externally)
CMOS DDS
AD7008
50MHz
50 CABLE
Typical
Value
SPECTRUM ANALYZER
125
0 to +1.0
4.1 to 5
0.0 to 0.5
INTERFACE
SUPPLY
POWER
EXTERNAL
SUPPLY
POWER
Units
mA
V
V
V
+5V
–15–
necessary software. This data sheet provides information on
operating the evaluation board; additional details are available
from the ADI technical assistance line 1-800-ANALOGD.
Prototyping Area
An area near one edge of the board is intentionally left void of
components to allow the user to add additional circuits to the
evaluation test set. Users may want to build custom analog fil-
ters for the outputs, or add buffers and operational amplifiers
used in the final applications.
XO vs. External Clock
The reference clock of the AD7008/PCB is normally provided
by a 50 MHz CMOS oscillator. This oscillator can be removed
and an external CMOS clock connected to CLOCK. If an ex-
ternal clock is used, a 50
Power Supply
Power for the AD7008/PCB must be provided externally
through the pin connections, as described in the Inputs/Outputs.
The power leads should be twisted to reduce ground loops.
Quantity Reference
1
8
6
1
1
1
1
1
3
2
1
1
1
1
1
1
1
4
1
26
C1
C2–C9
CLOCK, FSEL SMB – Submin Snap-on (Male)
I
SCLK, SDATA
FSADJ
LK1
P1
P2
R1–R3
R4, R5
RZ1
RZ2
U1
U2
V
XTAL
OUT
AD7008/PCB BILL OF MATERIAL
REF
, I
OUTN
resistor R6 should be installed.
Description
Tag – Tant Cap, 10 F, 35 V, 20%
Cer Chip Cap, 0.1 F, Murata
Grm42
PCB MT Plug
RN55 – Res Met Film, 392
HDR SIP 3-Pin Male
Shunt 530153-2
36-Pin D Conn Rt Ang Pcmt
Fem AMP
PC Voltage Ter Blk w/Screws
Augat RDI
RN55 – Res Met Film, 10k
RN55 – Res Met Film, 49.9
10P Bussed Res Ntwk, 10k
CSC10A01103G
6P Bussed Res Ntwk, 4.7k
CSC06A01472G
AD7008 JP50 CMOS DDS
Modulator
74HC74 – Dual D-type Pos-Ed-
Trigd Flip-Flop
Pin Terminal, Testpoint
OSC XTAL, Fox F1100H
50 MHz
Socket, Methode 213-044-501
Support, Nylon
PCB, 48295(-)
Pin Sockets, Closed End
AD7008