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ADL5592-EVALZ1 Datasheet(PDF) 14 Page - Analog Devices

Part No. ADL5592-EVALZ1
Description  250 MHz to 2400 MHz RF Variable Gain Amplifier
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADL5592-EVALZ1 Datasheet(HTML) 14 Page - Analog Devices

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ADL5592
Rev. 0 | Page 14 of
20
GSM/EDGE TRANSMIT APPLICATION
Figure 20, Figure 21, and Figure 22 show effects of different input
power levels on the spectral mask and EVM. The gain code is held
constant at the minimum attenuation (corresponding to Code 0
for both attenuators).
At low output power levels, both the spectral mask and EVM
remain flat. At higher output power levels, however, the spectral
mask expands and the EVM increases.
At an output of 12 dBm at 925.5 MHz, the peak and rms EVM
are 0.56% and 1.51%, respectively. The spectral mask offsets at
400 kHz, 600 kHz, and 1.2 MHz sit at −72.2 dBc, −84.8 dBc,
and −88.01 dBc, respectively.
Note that the minimum attenuation setting results in the highest
spectral mask and EVM values (excluding noise floor limitations).
Increasing the input attenuation of ATTN 1 causes less power to
be presented to the amplifier stage. Therefore, the levels of the
spectral mask and EVM decrease as the input attenuation of
ATTN 1 is increased. As the output attenuation of ATTN 2 is
increased, the levels of the spectral mask and EVM remain flat.
SOLDERING INFORMATION
On the underside of the chip scale package, there is an exposed
compressed paddle. This paddle is internally connected to the
chip’s ground. Solder the paddle to the low impedance ground
plane on the printed circuit board to ensure specified electrical
performance and to provide thermal relief. It is also recommended
that the ground planes on all layers under the paddle be stitched
together with vias to reduce thermal impedance.
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
10
9
8
7
6
5
4
3
2
1
0
7.5
10.0
12.5
15.0
17.5
OUTPUT (dBm)
400kHz OFFSET
RMS EVM
PEAK EVM
600kHz OFFSET
1.2MHz OFFSET
Figure 20. EVM and Spectral Mask vs. Output Power,
488.8 MHz EDGE Signal, 270 nH RF Choke, Minimum Attenuation
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
10
9
8
7
6
5
4
3
2
1
0
7.5
10.0
12.5
15.0
17.5
OUTPUT (dBm)
400kHz OFFSET
RMS EVM
PEAK EVM
600kHz OFFSET
1.2MHz OFFSET
Figure 21. EVM and Spectral Mask vs. Output Power,
925.5 MHz EDGE Signal, 270 nH RF Choke, Minimum Attenuation
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
10
9
8
7
6
5
4
3
2
1
0
7.5
10.0
12.5
15.0
17.5
OUTPUT (dBm)
400kHz OFFSET
RMS EVM
PEAK EVM
600kHz OFFSET
1.2MHz OFFSET
Figure 22. EVM and Spectral Mask vs. Output Power,
1960 MHz EDGE Signal, 33 nH RF Choke, Minimum Attenuation


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