AD8346
EVALUATION BOARD
The schematic of the AD8346 evaluation board is shown in
Figure 30. This is a 4-layer FR4 board; the two center layers are
used as ground planes and the top and bottom layers are used
for signal and power. Figure 31 shows the layout and Figure 32
shows the silkscreen. The evaluation board circuit closely
follows the basic connections circuit shown in Figure 27.
All connectors are of the SMA type. The I and Q inputs are
provided with pads for implementing a simple RC filter
network. The local oscillator input is driven through a balun
(M/A-COM Part Number ETC1-1-13).
Slide SW1 to the A position to connect the ENBL pin to +VS
via the 10 kΩ pull-up resistor REP. Slide SW1 to the B position
to disable the device by grounding the ENOP pin through the
49.9 Ω pull-down resistor REG. The device may be enabled via
an external voltage applied to the SMA connector ENOP or TP2.
CIP
OPEN
CQP
OPEN
AD8346
RIP
RQP
QP
QN
IP
IN
IBBP
IBBN
COM1
COM1
LOIN
LOIP
QBBP
QBBN
COM4
COM4
VPS2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
0Ω
0Ω
RIS
OPEN
RQS
OPEN
RIN
RQN
0Ω
0Ω
CIN
OPEN
CQN
OPEN
RLON
OPEN
1
2
3
CLON
100pF
R2
5
4
+V
LO
S
0
Ω
C4
C3
0.01μF
T1
CLOP
100pF
RLOS
OPEN
100pF
ETC1-1-13
VOUT
COM3
COM2
CVO
100pF
RLOP
OPEN
VPS1
ENBL
TP2
ENOP
VOUT
+V
S
R7
C1
0.01
C2
100pF
0
Ω
μ
F
REP
10k
Ω
A
B
ENOP
SW1
REG
49.9k
Ω
Figure 30. Evaluation Board Schematic
Rev. A | Page 14 of 20
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