AD8340ACPZ-WP Analog Devices Inc, AD8340ACPZ-WP Datasheet - Page 12

• Manufacturer Part Number: AD8340ACPZ-WP
• Description: IC MOD VECT 700-1000MHZ 24-LFCSP
• Manufacturer: Analog Devices Inc

Specifications of AD8340ACPZ-WP

• Function: Vector, Modulator
• Lo Frequency: 700MHz ~ 1GHz
• Rf Frequency: 700MHz ~ 1GHz
• P1db: 11dBm
• Noise Floor: -149dBm/Hz
• Current - Supply: 150mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Test Frequency: 880MHz
• Package / Case: 24-VFQFN, CSP Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD8340
APPLICATIONS INFORMATION
USING THE AD8340
The AD8340 is designed to operate in a 50 Ω impedance
system. Figure 30 illustrates where the RF input is driven in
a single-ended fashion while the differential RF output is
converted to a single-ended output with an RF balun. The
baseband 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.
RF INPUT AND MATCHING
The input impedance of the AD8340 is defined by the characteris-
tics of the polyphase network. The capacitive component of the
network causes its impedance to roll off with frequency, albeit at
a slower rate than 6 dB/octave. With matching inductors on the
order of 5.6 nH in series with each of the RF inputs, RFIP and
QBBM
INPUT
QBBP
IBBM
IBBP
VP
RF
VP
0.1µF
C3
100pF
100pF
C6
C5
C8
0.1µF
100pF
C4
5.6nH
5.6nH
L3
L4
C7
100pF
VPRF
CMRF
RFIM
RFIP
CMRF
VPRF
(SEE TEXT)
(SEE TEXT)
IFLP
C12
C11
AD8340
Figure 30. Basic Connections
100pF
Rev. B | Page 12 of 20
C2
VP
C9
100pF
DSOP
VPS2
CMOP
CMOP
RFOM
CMOP
CMOP
RFOP
C1
0.1µF
C10
0.1µF
RFIM, a 50 Ω match is achieved with a return loss of >10 dB
over the operating frequency range. Different matching
inductors can improve matching over a narrower frequency
range. The single-ended and differential input impedances are
exactly the same.
The RFIP and RFIM should be ac-coupled through low loss
series capacitors as shown in Figure 29. The internal dc levels
are at approximately 1 V. For single-ended operation, one input
is driven by the RF signal and the other input is ac grounded.
120nH
L1
RF
VP
Figure 29. RF Input Interface to the AD8340 Showing
A
B
Coupling Capacitors and Matching Inductors
OUTPUT
DISABLE
50Ω
C14
0.1µF
L2
120nH
100pF
100pF 5.6nH
100pF
100pF ETC1-1-13
VP
C18
C17
5.6nH
RFIM
RFIP
~1VDC
RF
OUTPUT
PHASE
RC