CV221-2A
The Communications Edge
TM
Product Information
1.9 – 2.4 GHz Dual-Branch Downconverter
Application Circuit: IF = 240 MHz (CV221-2APCB240)
RF = 1900 – 2200 MHz, IF = 240 MHz
PCB Layout
Circuit Board Material: .014” FR-4, 4 layers, .062” total thickness
Bill of Materials
Ref. Desig.
R1
(1)
R2, R3, R4, L3, L7
L10, L11
R6, R7
C1, C5, C10, C15
C4, C11
(2)
C6, C12, C14
C7, C13
L1
L4, L8
(2)
L5, L9
C2, C3, C8, C9, C16
C17, C19, C20, C21
C22, L2, L6
U1
Component
13
Ω
chip resistor
0
Ω
chip resistor
8.2
Ω
chip resistor
1000 pF chip capacitor
3 pF chip capacitor
.018
μF
chip capacitor
100 pF chip capacitor
120 nH chip inductor
82 nH chip inductor
220 nH chip inductor
Shown on silkscreen, but
not used in actual circuit.
CV221-2A WJ Converter
QFN
Size
0805
0603
0603
0603
0603
0603
0603
0603
0603
0805
Notes:
1.
The R1 resistor can be modified for the CV221-2A to draw less current. Changing it from 13 to 18Ω is expected to have the converter draw 17mA
less current so that the converter will draw about 300mA typically under LO drive, while degrading the IIP3 performance by 0.5 dB.
2.
The values shown above have the IF tuned at 240 MHz and will affect the optimal performance of the converter. For other frequencies, these
components need to be modified as follows:
Ref. Desig.
C4, C11
L4, L8
IF Center Frequency (MHz)
70
75
100
120
140
240
15 pF 15 pF 8.2 pF 8.2 pF 5.6 pF 3 pF
220 nH 220 nH 180 nH 150 nH 150 nH 82 nH
Specifications and information are subject to change without notice
WJ Communications, Inc
•
Phone 1-800-WJ1-4401
•
FAX: 408-577-6621
•
e-mail: sales@wj.com
•
Web site: www.wj.com
Page 3 of 5 May 2006
WJCI [ WJ COMMUNICATION. INC. ]
