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AD8348
differential impedance of 200 Ω (100 Ω per side). The
differential inputs should then be fed into SMA connectors
MXIP and MXIN.
Mixer Outputs
The I and Q mixer outputs are available through the IMXO and
QMXO SMA connectors. These outputs are biased to VCMO
and are not designed to drive loads smaller than 200 Ω. To
prevent damage to test equipment that cannot tolerate dc biases,
pads for series dc-blocking capacitors are provided. These pads
are populated with 0 Ω by default.
Baseband Outputs
The baseband outputs are made available at the IOPP, IOPN,
QOPP, and QOPN test points and SMA connectors. These
outputs are not designed to be connected directly to 50 Ω loads
and should be presented with loads of approximately 2 kΩ or
greater.
The dc bias level of the baseband amplifier outputs are by
default tied to VREF through LK11. If desired, the dc bias level
can be changed by removing LK11 and driving a dc voltage
onto the VCMO test point.
+V S
C52
0.1μF
C51
100pF
J21
LO
4 5
T21
ETC1-1-13
GND
J3I
IOPN
IOPN
GND
C9I
OPEN
R5I
0 ?
C21
1000pF
3 1
R21
60.4 ?
C22
1000pF
R5Q
0 ?
C9Q
OPEN
QOPN
GND
J3Q
QOPN
J2I
IOPP
IOPP
C8I
OPEN
R4I
0 ?
1
AD8348
LOIP LOIN 28
R4Q
0 ?
C8Q
OPEN
QOPP
J2Q
QOPP
2
VPOS1 COM1 27
VCMO
C13
0.1μF
3
4
IOPN
IOPP
QOPN 26
QOPP 25
+V S
IF
MX
SW12
J1I
IMXO
LK2I
C10I
0 ?
IMXO
L3I
OPEN
C3I
OPEN
L2I
OPEN
C2I
OPEN
L1I
OPEN
C1I
OPEN
R3I
49.9 ?
LK4I
LK3I
LK1I
LK11
5
6
7
VCMO
IAIN
COM3
ENVG 24
QAIN 23
COM3 22
LK4Q
LK3Q
LK1Q
R3Q
49.9 ?
VCMO
L1Q
OPEN
C1Q
OPEN
L2Q
OPEN
C2Q
OPEN
QMXO
L3Q
OPEN
C3Q
OPEN
C10Q
0 ?
LK2Q
J1Q
QMXO
R2I
OPEN
C7I
OPEN
C6I
OPEN
C5I
OPEN
C4I
OPEN
R1I
OPEN
8
9
IMXO QMXO 21
COM2 VPOS3 20
R1Q
OPEN
C4Q
OPEN
C5Q
OPEN
C6Q
OPEN
C7Q
OPEN
R2Q
OPEN
VCMO
C32
1000pF
10
11
IFIN
IFIP
MXIN 19
MXIP 18
C55
100pF
C55
0.1μF
+V S
R44
OPEN
VCMO
C43 R42
1000pF 0 ?
100pF LK5I
IFIP
R31
57.6 ?
+V S
R32
174 ?
C31
1000pF
C54
0.1μF
C53
12
13
14
VPOS2
IOFS
VREF
VGIN 17
QOFS 16
ENBL 15
LK5Q
C41
1μF
R14
10k ?
R43
OPEN
T41
ETK4-2T
C42
1000pF
R41
OPEN
MXIN
MXIP
ENBL
VENB
R12
10k ?
ENBL
SW11
R11
49.9 ?
DENBL
IOFS
C0I
0.1μF
VREF
C11
4.7μF
QOFS
C0Q
0.1μF
+V S
SW13
POT
EXT
R13
OPEN
C12
0.1μF
R15
10k ?
POT
VGIN
Figure 60. Evaluation Board Schematic
Rev. A | Page 24 of 28
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