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ADL5570ACPZ-R7

P1-P3P4-P6P7-P9P10-P12P13-P13
ADL5570
Rev. 0 | Page 9 of 12
64 QAM OFDMA PERFORMANCE
The ADL5570 shows exceptional performance when used with
a higher order modulation scheme, such as a 64 QAM system.
Figure 13, Figure 14, and Figure 15 illuminate the EVM, gain,
and current consumption performance within the context of
a 64 QAM OFDMA system.
06729-006
P
OUT
(dBm)
EVM (%)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
0 5 10 15 20 25 30 35
2400MHz
2350MHz
2300MHz
Figure 13. EVM vs. P
OUT
Performance at
V
CC
= 3.5 V and 64 QAM OFDMA Signal
28
29
30
31
32
2280 2300 2320 2340 2360 2380 2400 2420
0
6729-007
FREQUENCY (MHz)
GAIN (dB)
Figure 14. Gain vs. Frequency Performance at
V
CC
= 3.5 V and 64 QAM OFDMA Signal
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
0 5 10 15 20 25 30 35
06729-008
P
OUT
(dBm)
CURRENT (A)
Figure 15. Burst Current vs. P
OUT
at V
CC
= 3.5 V, 64 QAM,
2350 MHz, 31% 802.16e OFDMA Signal
POWER-ADDED EFFICIENCY
The efficiency of the ADL5570 is defined on the current that it
draws during the data burst of an 802.16e OFDMA signal. In
typical test setup, the average rms current, I
AVG
, is measured.
However,
I
AVG
= Duty Cycle (in decimal) × I
BURST
+
(1 − Duty Cycle [in decimal]) × I
DEFAULT
where:
I
BURST
is the rms current during the data burst of an
OFDMA signal.
I
DEFAULT
can be the quiescent current drawn when there is no
data burst and the device remains biased, the sleep current
(1 mA) if the device is defaulted to sleep mode, or the
standby current.
For example, in a 31% duty cycle 802.16e OFDMA signal,
the burst current is calculated by rearranging the previous
equation to get
0.31
)0.69(
DEFAULT
AVG
BURST
I
I
×
Ι
=
Finally, the PAE is calculated by
100
(mA)(V)
(mW)(mW)
(%) ×
×
−
=
BURST
CC
IV
PowerInputRFPowerOutputRF
PAE
When RF = 2.35 GHz, 31% 16 QAM OFDMA signal,
V
CC
= 3.5 V, RF output power = 25 dBm, and RF input
power = −4 dBm, the ADL5570 consumes a burst current,
I
BURST
= 450 mA and PAE = 21%.
ADL5570
Rev. 0 | Page 10 of 12
EVALUATION BOARD
The evaluation board layout is shown in Figure 16. The ADL5570
performance data was taken on a FR4 board. During board
layout, 50 Ω RF trace impedance must be ensured. The output
matching capacitor, C3, is placed 30 mils from the package edge.
06729-016
Figure 16. Evaluation Board Layout
Table 6. Evaluation Board Configuration Options
Component Function Default Value
VPOS, VPOS1, GND Supply and Ground Connections. W1 = Installed
TP1 (STBY)
Transmit/Standby Mode: When STBY is low (0 V), the device operates in transmit
mode. When the radio is receiving data, STBY can be taken high (2.5 V), reducing
the supply current to 10 mA.
Not applicable
TP2 (VREG)
Normal/Sleep Mode: When VREG is low, the device goes into sleep mode,
reducing the supply current to 10 μA. When VREG is high (2.85 V), the device
operates in its normal transmit mode. When high, VREG draws a bias current of
approximately 10 mA.
Not applicable
TP5 (MODE), R1
High/Low Power Mode: Switches between high power mode and low power
mode. When MODE is low (0 V), the device operates in high power mode.
When MODE is high (2.5 V), the device operates in low power mode.
R1 = 50 kΩ (Size 0402)
L3 Input Interface: L3 matches the input to 50 Ω. L3 = 2.7 nH (Size 0402)
C3, C4 Output Interface: C4 provides dc blocking, and C3 matches the output to 50 Ω.
C4 = 39 pF (Size 0402)
C3 = 3.3 pF (Size 0402)
(Tight tolerance recommended)
C2
Filter Interface: A ground-referenced capacitor should be connected to this
node to reduce bias line noise.
C2 = 2.2 pF (Size 0402)
C7 to C12
Power Supply Decoupling: The capacitors, C7 through C12, are used for power
supply decoupling. They should be placed as close as possible to the DUT.
C7 to C10 = 0.01 μF (Size 0402)
C11, C12 = 1 μF (Size 0402)
L1, L2, C6, C5
RF Trap: L1, C6 and L2, C5 form tank circuits and prevent RF from propagating
on the dc supply lines.
L1 = 1 nH (Size 0402)
C6 = 3.6 pF (Size 0402)
L2 = 11 nH (Size 0402)
C5 = Open
ADL5570
Rev. 0 | Page 11 of 12
MEASUREMENT SETUP USING THE ADL5570
EVALUATION BOARD
When using the ADL5570 evaluation board, the following setup
must be used:
1.
Connect the output of the WiMAX signal generator to the
RF input through a cable.
2.
Connect the RF output SMA of the ADL5570 to the
Spectrum Analyzer (preferably through an attenuator).
3.
Connect the power supply to VPOS. Set voltage to the
desired supply level. Be sure to keep the current limit on
this source to 1 A.
4.
Ensure that Jumper W1 is in place. Alternatively, use a
jumper cable to connect VPOS to VPOS1.
5.
Follow Tabl e 4 for measurement in desired mode.
6.
Turn the RF source on.
7.
Turn all voltage supplies on.
P1-P3P4-P6P7-P9P10-P12P13-P13

ADL5570ACPZ-R7

Mfr. #:
Buy ADL5570ACPZ-R7
Manufacturer:
Analog Devices Inc.
Description:
IC AMP WIMAX 2.4GHZ 16LFCSP-VQ
Lifecycle:
New from this manufacturer.
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