adl5387 Analog Devices, Inc., adl5387 Datasheet - Page 15

• Manufacturer Part Number: adl5387
• Description: 50 Mhz To 2 Ghz Quadrature Demodulator
• Manufacturer: Analog Devices, Inc.

APPLICATIONS INFORMATION
BASIC CONNECTIONS
Figure 47 shows the basic connections schematic for the ADL5387.
POWER SUPPLY
The nominal voltage supply for the ADL5387 is 5 V and is
applied to the VPA, VPB, VPL, and VPX pins. Ground should
be connected to the COM, CML, and CMRF pins. Each of
the supply pins should be decoupled using two capacitors;
recommended capacitor values are 100 pF and 0.1 μF.
LOCAL OSCILLATOR (LO) INPUT
The LO port is driven in a single-ended manner. The LO signal
must be ac-coupled via a 1000 pF capacitor directly into LOIP,
and LOIN is ac-coupled to ground also using a 1000 pF capacitor.
The LO port is designed for a broadband 50 Ω match and
therefore exhibits excellent return loss from 100 MHz to 4 GHz.
The LO return loss can be seen in Figure 20. Figure 46 shows
the LO input configuration.
0.1µF
V
POS
0.1µF
V
POS
100pF
100pF
Figure 47. Basic Connections Schematic for ADL5387
1
2
3
4
5
6
VPA
COM
BIAS
VPL
VPL
VPL
1000pF
RFC
120nH
24
7
LO
23
8
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1000pF 1000pF
ADL5387
ETC1-1-13
22
9
1000pF
21
10
20
11
The recommended LO drive level is between −6 dBm and
+6 dBm. The LO frequency at the input to the device should be
twice that of the desired LO frequency at the mixer core. The
applied LO frequency range is between 100 MHz and 4 GHz.
120nH
19
12
QLO
VPB
VPB
QHI
ILO
IHI
18
17
16
15
14
13
100pF
LO INPUT
Figure 46. Single-Ended LO Drive
ILO
IHI
QLO
1000pF
0.1µF
QHI
1000pF
V
POS
8
9
LOIP
LOIN
ADL5387