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AD9851 Datasheet(PDF) 11 Page - Analog Devices

No. de pieza AD9851
Descripción Electrónicos  CMOS 180 MHz DDS/DAC Synthesizer
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD9851 Datasheet(HTML) 11 Page - Analog Devices

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AD9851
–11–
REF
CLOCK
90
PHASE
DIFFERENCE
8-BIT DATA BUS
FQ UD
RESET
W CLK
AD9851
#2
IOUT
AD9851
#1
W CLK
FQ UD
RESET
IOUT
RESET
FQ UD
RESET
FQ UD
W CLK #2
W CLK #1
MICROPROCESSOR
OR
MICROCONTROLLER
W CLK #2
W CLK #1
Figure 7. Application Showing Synchronization of
Two AD9851 DDSs to Form a Quadrature Oscillator
After a common RESET command is issued, separate W_CLKs
allow independent programming of each AD9851 40-bit input reg-
ister via the 8-bit data bus or serial input pin. A common FQ_UD
pulse is issued after programming is completed to simultaneously
engage both oscillators at their specified frequency and phase.
AD9851
IOUT
30MHz
CLOCK
BANDPASS
FILTER
50
50
FUNDAMENTAL
FCLK
IMAGE
FC – FO
IMAGE
FC + FO
60 120
180
240
FREQUENCY – MHz
240
FREQUENCY – MHz
IMAGE
FC + FO
BANDPASS
FILTER
 6
AMPLIFIER
240MHz
AD9851
SPECTRUM
FINAL OUTPUT
SPECTRUM
Figure 8. Deriving a High Frequency Output Signal
from the AD9851 by Using an Alias or Image Signal
The differential DAC output connection in Figure 9 enables
reduction of common-mode signals and allows highly reactive
filters to be driven without a filter input termination resistor (see
above single-ended example, Figure 8). A 6 dB power advantage
is obtained at the filter output as compared with the single-ended
example, since the filter need not be doubly terminated.
REFERENCE
CLOCK
FILTER
DIFFERENTIAL
TRANSFORMER COUPLED
OUTPUT
50
1:1 TRANSFORMER
i.e., MINI-CIRCUITS T1–1T
50
AD9851
DDS
21
20
Figure 9. Differential DAC Output Connection for
Reduction of Common-Mode Signals
The AD9851 RSET input is driven by an external DAC (Figure 10)
SET
SET
to provide amplitude modulation or fixed, digital amplitude control
of the DAC output current. Full description of this application is
found as a Technical Note in the AD9851 data sheet under Related
Information. An Analog Devices' application note for the AD9850,
AN-423, describes another method of amplitude control using
an enhancement mode MOSFET that is equally applicable to
the AD9851.
NOTE: If the 6 REFCLK multiplier of the AD9851 is engaged,
the 125 MHz clocking source shown in Figure 10 can be reduced
by a factor of six.
AD9851
DDS
DIFFERENTIAL
TRANSFORMER COUPLED
OUTPUT
50
1:1 TRANSFORMER
50
IOUT
IOUT
RSET
+5V
21
20
12
9
4k
200
330
+5V
20mA
MAX
10-BIT DAC
AD9731
+5V
–5V
125MHz
10 BITS
DATA
GENERATOR
e.g., DG-2020
COMPUTER
CONTROL
DATA
Figure 10.The AD9851 RSET Input Being Driven by an External DAC
REV. D


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