AD9854/PCBZ Analog Devices Inc, AD9854/PCBZ Datasheet - Page 18

• Manufacturer Part Number: AD9854/PCBZ
• Description: 300 MHZ QUADRATURE DDS SYN. Eval Board
• Manufacturer: Analog Devices Inc
• Series: AgileRF™r

Specifications of AD9854/PCBZ

• Main Purpose: Timing, Direct Digital Synthesis (DDS)
• Utilized Ic / Part: AD9854
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD9854
µPROCESSOR/
CONTROLLER
REFERENCE
FPGA, ETC.
CLOCK
2kΩ
8-BIT PARALLEL OR
SERIAL PROGRAMMING
DATA AND CONTROL
SIGNALS
300MHz MAX DIRECT
MODE OR 15MHz TO 75MHz
MAX IN THE 4× TO 20×
CLOCK
MULTIPLIER MODE
R
SET
AD9854
REFERENCE
CLOCK
Figure 34. Frequency Agile Clock Generator Applications for the AD9854
AD9854
Q DAC OR
CONTROL
I DAC
A
DAC
OUT
CMOS LOGIC CLOCK OUT
= 100MHz
Figure 33. Clock Frequency Doubler
+
LPF
LPF
Rev. E | Page 18 of 52
COS
SIN
1
2
COMPARATORS
LOW-PASS
LOW-PASS
FILTER
FILTER
NOTES
1. I
2. SWITCH POSITION 1 PROVIDES COMPLEMENTARY
3. SWITCH POSITION 2 PROVIDES THE SAME DUTY CYCLE
SINUSOIDAL SIGNALS TO THE COMPARATOR
TO PRODUCE A FIXED 50% DUTY CYCLE FROM THE
COMPARATOR.
USING QUADRATURE SINUSOIDAL SIGNALS TO THE
COMPARATOR OR A DC THRESHOLD VOLTAGE TO
ALLOW SETTING OF THE COMPARATOR DUTY CYCLE
(DEPENDS ON THE CONFIGURATION OF THE Q DAC).
OUT
CLOCK OUT = 200MHz
= APPROX 20mA MAX WHEN R
SET
= 2kΩ.