AD9912/PCBZ Analog Devices Inc, AD9912/PCBZ Datasheet - Page 10

• Manufacturer Part Number: AD9912/PCBZ
• Description: Eval Board
• Manufacturer: Analog Devices Inc
• Series: AgileRF™r

Specifications of AD9912/PCBZ

• Kit Features: Flexible System Clock I/P Accepts Crystal
• Supported Devices: AD9912
• Tool / Board Applications: Direct Digital Synthesizer
• Development Tool Type: Hardware - Eval/Demo Board
• Mcu Supported Families: AD9912
• Main Purpose: Timing, Direct Digital Synthesis (DDS)
• Embedded: No
• Utilized Ic / Part: AD9912
• Primary Attributes: 14-Bit DAC, 48-Bit Tuning Word Width
• Secondary Attributes: 1GHz, Graphical User Interface
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

AD9912/PCBZ
DIFFERENTIAL FILTER DESIGN
The differential filter advantages include fewer components and
a simpler design when the
Note that the 100 Ω differential source impedance is internal to
the IOUT/IOUB driver. Also, note that the ac coupling between
the IOUT differential pair and the FDBK_IN differential pair is
critical. Component matching between the corresponding LC
sections is important in this design. The example shown in
Figure 6 is for a cutoff of 240 MHz.
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
10M
INTERNAL TO AD9912
DACOUT/DACOUTB
DRIVER
AD9912
R1
100Ω
PHASE
Figure 7. Frequency Response of Differential Reconstruction Filter Shown in Figure 6
is used in an actual design.
C3
10.0pF
Q = 50.0
320MHz
320MHz
L4
22.0nH
Q = 20.0
C4
11.0pF
Q = 50.0
L5
22.0nH
Q = 20.0
C5
11.0pF
Q = 50.0
Figure 6. Differential Low-Pass Reconstruction Filter
C6
14.0pF
Q = 50.0
370MHz
370MHz
L7
29.0nH
Q = 20.0
C7
6.30pF
Q = 50.0
L8
29.0nH
Q = 20.0
C8
6.30pF
Q = 50.0
Rev. 0 | Page 10 of 12
FREQUENCY (Hz)
100M
C9
17.0pF
Q = 50.0
7
•
•
•
•
•
th
L10
34.0nH
Q = 20.0
610MHz
L11
34.0nH
Q = 20.0
610MHz
C10
2.00pF
Q = 50.0
C11
2.00pF
Q = 50.0
Order Elliptical Differential Low-Pass Filter
Pass-band frequency: 240 MHz
Pass-band ripple: 1.0 dB
Stop-band ratio: 1.3
Stop-band frequency: 312 MHz
Stop-band attenuation: 70 dB
MAGNITUDE
C12
13.0pF
Q = 50.0
R13
100Ω
TO FDBK_IN
TO FDBK_INB
1G
480
400
320
240
160
80
0
–80
–160
–240