Evaluation board, Ad8342 – Analog Devices AD8342 User Manual
Page 19
AD8342
Rev. 0 | Page 19 of 20
EVALUATION BOARD
An evaluation board is available for the AD8342. The evaluation board is configured for single-ended signaling at the IF output port via a
balun transformer. The schematic for the evaluation board is presented in Figure 53.
R2
0
Ω
R1
0
Ω
C6
1000pF
C4
1000pF
C1
1000pF
C3
1000pF
C5
0.1
µF
C2
0.1
µF
VPOS
RF_IN
C7
1000pF
INLO
C8
1000pF
C9
0.1
µF
C10
100pF
VPOS
R11
0
Ω
R16
0
Ω
R10
0
Ω
R12
OPEN
Z4
OPEN
R4
OPEN
3
4
1
6
2
TC2-1T
Z2
OPEN
R3
OPEN
100
Ω TRACES,
NO GROUND PLANE
IF_OUT+
IF_OUT–
R15
0
Ω
T1
Z1
OPEN
Z3
OPEN
R5
100
Ω
C14
OPEN
L1
0
Ω
COMM
IFOP
IFOM
COMM
COMM
RFCM
RFIN
VPMX
VPDC PWDN EXRB COMM
VPLO LOCM
LOIN COMM
DUT
12
11
10
9
13
14
15
16
1
2
3
4
8
7
6
5
R6
1.82k
Ω
C11
100pF
R7
0
Ω
C13
100pF
C12
0.1
µF
VPOS
GND
PWDN
VPOS
W1
R8
10k
Ω
R9
0
Ω
PWDN
05352-003
50
Ω
TRACE
Figure 53. Evaluation Board
Table 6. Evaluation Board Configuration Options
Component
Function
Default Conditions
R1, R2, R7,
C2, C4, C5, C6, C10
C12, C13, C14, C9
Supply decoupling. Shorts or power supply decoupling resistors and filter
capacitors.
R1, R2, R7 = 0 Ω
C4, C6 = 1000 pF
C10, C13 = 100 pF
C2, C5, C12, C9 = 0.1 µF
R3, R4
Options for single-ended IF output circuit.
R3, R4 = Open Ω
R15, 16
R15, R16 = 0 Ω
R6, C11
R
BIAS
resistor that sets the bias current for the mixer core. The capacitor
provides ac bypass for R6.
R6 = 1.82 kΩ
C11 = 100 pF
R8
Pull down for the PWDN pin.
R8 = 10 kΩ
R9
Link to PWDN pin.
R9 = 0 Ω
C3, R5, C16, L1
RF input. C3 provides dc block for RF input. R5 provides a resistive input
termination. C16 and L1 are provided for reactive matching the input.
C3 = 1000 pF
R5 = 100 Ω
C14 = Open
L1 = 0 Ω
C1
RF common ac coupling. Provides dc block for RF input common
connection.
C1 = 1000 pF
C8
C7
LO input ac coupling. Provides dc block for the LO input.
LO common ac coupling. Provides dc block for LO input common
connection.
C7, C8 = 1000 pF
W1
Power down. The part is on when the PWDN is connected to ground via a
10 kΩ resistor. The part is disabled when PWDN is connected to the positive
supply (V
S
) via W1.
T1, R12, R11, Z3,
Z4, Z1, Z2, R10
IF output interface. T1 converts a differential high impedance IF output to
single-ended. When loaded with 50 Ω, this balun presents a 100 Ω load to
the mixers collectors. The center tap of the primary is used to supply the
bias voltage (V
S
) to the IF output pins.
T1 = TC2-1T, 2:1 (Mini-Circuits)
R12 = Open Ω
R10, R11 = 0 Ω
Z3, Z4 = Open
Z1, Z2 = Open