ADL5380-29A-EVALZ AD [Analog Devices], ADL5380-29A-EVALZ Datasheet - Page 23

• Manufacturer Part Number: ADL5380-29A-EVALZ
• Description: 400 MHz to 6 GHz Quadrature Demodulator
• Manufacturer: AD [Analog Devices]

APPLICATIONS INFORMATION
BASIC CONNECTIONS
Figure 78 shows the basic connections schematic for the ADL5380.
POWER SUPPLY
The nominal voltage supply for the ADL5380 is 5 V and is
applied to the VCC1, VCC2, and VCC3 pins. Connect ground
to the GND1, GND2, GND3, and GND4 pins. Solder the exposed
paddle on the underside of the package to a low thermal and
electrical impedance ground plane. If the ground plane spans
multiple layers on the circuit board, these layers should be stitched
together with nine vias under the exposed paddle. The AN-772
Application Note discusses the thermal and electrical grounding
of the LFCSP in detail. Decouple each of the supply pins using
two capacitors; recommended capacitor values are 100 pF and 0.1 μF.
IHI
ILO
V
0.1µF
S
V
0.1µF
S
100pF
100pF
Figure 78. Basic Connections Schematic
1
2
3
4
5
6
GND3
GND1
IHI
ILO
GND1
VCC1
100pF
24
7
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RFIN
100pF
BALUN
23
8
ADL5380
22
BALUN
9
LO_SE
21
10
LOCAL OSCILLATOR (LO) INPUT
For optimum performance, drive the LO port differentially
through a balun. The recommended balun for each performance
level includes the following:
• Up to 3 GHz is the Mini-Circuits TC1-1-13.
• From 3 GHz to 4 GHz is the Johanson Technology
• From 4.9 GHz to 6 GHz is the Johanson Technology
AC couple the LO inputs to the device with 100 pF capacitors.
The LO port is designed for a broadband 50 Ω match from
400 MHz to 6 GHz. The LO return loss can be seen in Figure 19.
Figure 77 shows the LO input configuration.
The recommended LO drive level is between −6 dBm and +6 dBm.
The applied LO frequency range is between 400 MHz and 6 GHz.
100pF
3600BL14M050.
5400BL15B050.
20
11
100pF
GND3
GND2
GND2
VCC2
19
12
QLO
QHI
RADJ
18
17
16
15
14
13
LO INPUT
V
S
BALUN
100pF
Figure 77. Differential LO Drive
0.1µF
100pF
100pF
V
S
10
9
QLO
LOIP
LOIN
QHI
ADL5380