ADL5390ACP-REEL7 Analog Devices Inc, ADL5390ACP-REEL7 Datasheet - Page 12

• Manufacturer Part Number: ADL5390ACP-REEL7
• Manufacturer: Analog Devices Inc

Specifications of ADL5390ACP-REEL7

• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

ADL5390
APPLICATIONS
USING THE ADL5390
The ADL5390 is designed to operate in a 50 Ω impedance system.
Figure 29 illustrates an example where the RF/IF inputs are
driven in a single-ended fashion, while the differential RF out-
put is converted to a single-ended output with a RF balun. The
baseband gain controls for the I and Q channels are typically
driven from differential DAC outputs. The power supplies,
VPRF and VPS2, should be bypassed appropriately with 0.1 µF
and 100 pF capacitors. Low inductance grounding of the CMOP
and CMRF common pins is essential to prevent unintentional
peaking of the gain. The exposed paddle on the underside of the
package should be soldered to a low thermal and electrical
impedance ground plane.
RF INPUT AND MATCHING
The RF/IF inputs present 250 Ω resistive terminations to
ground. In general, the input signals should be ac-coupled
through dc-blocking capacitors. The inputs may be driven dif-
ferentially or single-ended, in which case the unused inputs are
connected to common via the dc-blocking capacitors. The
ADL5390’s performance is not degraded by driving these inputs
single-ended. The input impedance can be reduced by placing
external shunt termination resistors to common on the source
side of the dc-blocking capacitors so that the quiescent dc-bias
RFIN_Q
RFIN_I
66.5Ω
66.5Ω
R22
R2
VP
10nF
10nF
C5
C2
VP
0Ω
0Ω
L2
L1
0.1µF
C7
0.1µF
C4
10nF
10nF
100pF
C6
C1
C3
C8
100pF
CMRF
INPI
INMI
IPMQ
INPQ
CMRF
VPRF
VPRF
(SEE TEXT)
(SEE TEXT)
C12
C11
Figure 29. Basic Connections
ADL5390
Rev. 0 | Page 12 of 24
QBBP QBBM
IBBP
IBBM
100pF
DSOP
VPS2
CMOP
CMOP
CMOP
CMOP
RFOM
RFOP
C10
level of the ADL5390 inputs is not affected, as shown in Figure
29. Capacitive reactance at the RF inputs can be compensated
for with series inductance. In fact, the customer evaluation
board has high impedance line traces between the shunt termi-
nation pads and the device input pins, which provides series in-
ductance and improves the return loss at 1.9 GHz to better than
−15 dB with the shunt termination removed, as shown in Figure
28.
Figure 28. ADL5390 Customer Evaluation Board RF Input Return Loss.
0.1µF
–10
–15
–20
–25
–30
–35
–5
C9
0
120nH
0.1µF
C14
R8
10kΩ
L4
SW1
VP
L3
120nH
VP
B
A
S11 MATCH WITH
TERMINATION
FREQUENCY (MHz)
10nF
10nF
C18
C17
(M/A-COM)
ETC1-1-13
S11 MATCH WITHOUT
66.5Ω TERMINATION
1
3
T1
5
4
RFOP