AD8314ACP-REEL_02 View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
AD8314ACP-REEL_02 Datasheet PDF : 17 Pages
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AD8314
Operation at 2.7 GHz
While the AD8314 is specified to operate at frequencies up to
2.5 GHz, it will work at higher frequencies, although it does
exhibit slightly higher output voltage temperature drift. Figure 14
shows the transfer function of a typical device at 2.7 GHz, at
ambient as well as hot and cold temperatures.
Figure 15 shows the transfer function of the AD8314 when driven
by both an unmodulated sine wave and a 64 QAM signal. As
already discussed, the higher peak-to-average ratio of the 64
QAM signal causes an increase in the intercept. In this case the
intercept increases by about 1.5 dB, causing the overall transfer
function to drop by the same amount. For precision operation,
the AD8314 should be calibrated for each signal type that is driving it.
Using the Chip Scale Package
On the underside of the chip scale package, there is an exposed
compressed paddle. This paddle is internally connected to the
1.2
3
+25؇C
1.0
2
0.8
+25؇C –30؇C
–30؇C 1
0.6
0
chip’s ground. While the paddle can be connected to the printed
circuit board’s ground plane, there is no thermal or electrical
requirement to do this.
EVALUATION BOARD
Figure 16 shows the schematic of the AD8314 µSO evaluation
board. The layout and silkscreen of the component side are
shown in Figures 17 and 18. An evaluation board is also avail-
able for the CSP package. (For exact part numbers, see Ordering
Guide.) Apart from the slightly smaller device footprint, the
CSP evaluation board is identical to the µSO board. The board
is powered by a single supply in the range, 2.7 V to 5.5 V. The
power supply is decoupled by a single 0.1 µF capacitor. Addi-
tional decoupling, in the form of a series resistor or inductor in
R9, can also be added. Table IV details the various configuration
options of the evaluation board.
1.2
3
1.0
2
CW
0.8
1
CW
0.6
0
0.4
–1
+80؇C
+80؇C
0.2
–2
0.0
–70 –60 –50 –40 –30 –20 –10
0
INPUT POWER – dBm
–3
10
Figure 14. Operating at 2.7 GHz
0.4
–1
64 QAM
0.2
–2
64 QAM
0.0
–70 –60 –50 –40 –30 –20 –10
0
INPUT POWER – dBm
–3
10
Figure 15. Shift in Transfer Function due to 64 QAM
INPUT
VSET
R1
0⍀
LK1
R8
(OPEN)
R2
52.3⍀
C1
0.1F
VPOS
1 RFIN
VPOS 8
R3
0⍀
2 ENBL
V DN 7
SW1
AD8314
3 VSET
V UP 6
R9
0⍀
R4
(OPEN)
4 FLTR
C4
(OPEN)
R7
0⍀
COMM 5
R5
0⍀
R6
(OPEN)
C2
(OPEN)
C3
(OPEN)
Figure 16. Evaluation Board Schematic
VPOS
V DN
V UP
–14–
REV. A
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