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ADL5350ACPZ-R7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
ADL5350
Rev. 0 | Page 19 of 24
APPLICATIONS INFORMATION
LOW FREQUENCY APPLICATIONS
The ADL5350 can be used in low frequency applications. The
circuit in
Figure 59 is designed for an RF of 136 MHz to 176 MHz
and an IF of 45 MHz using a high-side LO. The series and
parallel resonant circuits are tuned for 154 MHz, which is
the geometric mean of the desired RF frequencies. The
performance of this circuit is depicted in
Figure 60.
RF/IF GND2 LOIN NC
RF/IF NC VPOS
100nH
100nF
4.7µF
27pF36nH
10nF
27pF
LO
1nF
36nH
RF
3
V
IF
GND1
ADL5350
1234
8765
A
LL INDUCTORS
A
RE 0603CS
ERIES FROM
C
OILCRAFT
05615-061
Figure 59. 136 MHz to 176 MHz RF Downconversion Schematic
05615-065
40
35
30
25
20
15
10
12
10
8
6
4
2
0
136 176166156146
IP1dB, IIP3 (dBm)
CONVERSION LOSS (dB)
RF FREQUENCY (MHz)
IIP3
IP1dB
LOSS
Figure 60. Measured Performance for Circuit in
Figure 59
Using High-Side LO Injection and 45 MHz IF
HIGH FREQUENCY APPLICATIONS
The ADL5350 can be used at extended frequencies with
some careful attention to board and component parasitics.
Figure 61 is an example of a 2560 MHz to 2660 MHz down-
conversion using a low-side LO. The performance of this circuit
is depicted in
Figure 62. Note that the inductor and capacitor
values are very small, especially for the RF and IF ports. Above
2.5 GHz, it is necessary to consider alternate solutions to avoid
unreasonably small inductor and capacitor values.
RF/IF GND2 LOIN NC
RF/IF NC VPOS
2.1nH
100pF
4.7µF
0.7pF1.5nH
1nF
1pF
0.67nH
RF
3
V
IF
GND1
ADL5350
1234
8765
3.0nH
LO
100pF
A
LL INDUCTORS
A
RE 0302CS
SERIES FROM
COILCRAFT
+
0
5615-062
Figure 61. 2560 MHz to 2660 MHz RF Downconversion Schematic
05615-066
35
30
25
20
15
10
5
0
14
13
12
11
10
9
8
7
2560 26602580 2600 2620 2640
IP1dB, IIP3 (dBm)
CONVERSION LOSS (dB)
RF FREQUENCY (MHz)
IIP3
IP1dB
LOSS
Figure 62. Measured Performance for Circuit in
Figure 61
Using Low-Side LO Injection and 374 MHz IF
The typical networks used for cellular applications below
2.6 GHz use band-select and band-reject networks on the RF
and IF ports. At higher RF frequencies, these networks are not
easily realized by using lumped element components. As a result, it
is necessary to consider alternate filter network topologies to
allow more reasonable values for inductors and capacitors.
ADL5350
Rev. 0 | Page 20 of 24
Figure 63 depicts a crossover filter network approach to provide
isolation between the RF and IF ports for a downconverting
application. The crossover network essentially provides a high-
pass filter to allow the RF signal to pass to the RF/IF node (Pin 1
and Pin 8), while presenting a low-pass filter (which is actually
a band-pass filter when considering the dc blocking capacitor,
C
AC
). This allows the difference component (f
RF
− f
LO
) to be
passed to the desired IF load.
RF/IF GND2 LOIN NC
RF/IF NC VPOS
3.8nH
100pF
C2
1.8pF
L2
1.5nH
C
AC
100pF
C1
1.2pF
LO
100pF
2.2nH
RF
3
V
IF
GND1
ADL5350
1234
8765
L1
3.5nH
4.7µF
+
A
LL
INDUCTORS
A
RE 0302CS
ERIES FROM
C
OILCRAFT
05615-064
Figure 63. 3.3 GHz to 3.8 GHz RF Downconversion Schematic
When designing the RF port and IF port networks, it is
important to remember that the networks share a common
node (the RF/IF pins). In addition, the opposing network presents
some loading impedance to the target network being designed.
Classic audio crossover filter design techniques can be applied
to help derive component values. However, some caution must be
applied when selecting component values. At high RF frequencies,
the board parasitics can significantly influence the final optimum
inductor and capacitor component selections. Some empirical
testing may be necessary to optimize the RF and IF port filter
networks. The performance of the circuit depicted in
Figure 63
is provided in
Figure 64.
05615-067
30
25
20
15
10
5
0
14
2
4
6
8
10
12
3300 38003700360035003400
IP1dB, IIP3 (dBm)
CONVERSION LOSS (dB)
RF FREQUENCY (MHz)
IIP3
IP1dB
LOSS
Figure 64. Measured Performance for Circuit in
Figure 63
Using Low-Side LO Injection and 800 MHz IF
ADL5350
Rev. 0 | Page 21 of 24
EVALUATION BOARD
An evaluation board is available for the ADL5350. The evaluation board has two halves: a low band board designated as Board A
and a high band board designated as Board B. The schematic for the evaluation board is shown in
Figure 65.
RF/IF GND2 LOIN NC
RF/IF NC VPOS
L4-B
C2-BL2-B
C6-B
C1-B
LO-B
C3-B
L3-B
L1-B
V
POS-B
IF-B
GND1
ADL5350
U1-B
1234
8765
C4-B
C5-B
RF-B
+
RF/IF GND2 LOIN NC
RF/IF NC VPOS
L4-A
C2-AL2-A
C6-A
C1-A
LO-A
C3-A
L3-A
L1-A
V
POS-
A
IF-A
GND1
ADL5350
U1-A
1234
8765
C4-A
C5-A
RF-A
+
05615-059
Figure 65. Evaluation Board
Table 9. Evaluation Board Configuration Options
Component Function Default Conditions
C4-A, C4-B,
C5-A, C5-B
Supply Decoupling. C4-A and C4-B provide local bypassing of the supply.
C5-A and C5-B are used to filter the ripple of a noisy supply line. These are not
always necessary.
C4-A = C4-B = 100 pF,
C5-A = C5-B = 4.7 μF
L1-A, L1-B,
C1-A, C1-B
RF Input Network. Designed to provide series resonance at the intended
RF frequency.
L1-A = 6.8 nH (0603CS from Coilcraft),
L1-B = 1.7 nH (0302CS from Coilcraft),
C1-A = 4.7 pF, C1-B = 1.5 pF
L2-A, L2-B,
C2-A, C2-B,
C6-A, C6-B
IF Output Network. Designed to provide parallel resonance at the geometric mean
of the RF and LO frequencies.
L2-A = 4.7 nH (0603CS from Coilcraft),
L2-B = 1.7 nH (0302CS from Coilcraft),
C2-A = 5.6 pF, C2-B = 1.2 pF,
C6-A = C6-B = 1 nF
L3-A, L3-B,
C3-A, C3-B
LO Input Network. Designed to block dc and optimize LO voltage swing at LOIN.
L3-A = 8.2 nH (0603CS from Coilcraft),
L3-B = 3.5 nH (0302CS from Coilcraft),
C3-A = C3-B = 100 pF
L4-A, L4-B
LO Buffer Amplifier Choke. Provides bias and ac loading impedance to LO buffer
amplifier.
L4-A = 24 nH (0603CS from Coilcraft),
L4-B = 3.8 nH (0302CS from Coilcraft)
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ADL5350ACPZ-R7

Mfr. #:
Buy ADL5350ACPZ-R7
Manufacturer:
Analog Devices Inc.
Description:
RF Mixer Single Ended Passive Mixer
Lifecycle:
New from this manufacturer.
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