ADL5372 View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'ADL5372' PDF : 24 Pages View PDF
ADL5372
WCDMA OPERATION
The ADL5372 is suitable for operation in a WCDMA
environment, providing better than 72.5 dB of adjacent channel
power ratio (ACPR) at an output power of −10 dBm, with a
20 MHz noise floor of −157 dBm/Hz. Figure 36 and Figure 37
show the ACPR and 20 MHz offset noise floor of the ADL5372
vs. the output power at LO frequencies of 1966 MHz and
2140 MHz, respectively.
–70
–155.5
–72
ADJACENT CPR
–156.0
–74
–156.5
–76
ALTERNATE CPR
20MHz NOISE FLOOR
–157.0
–78
–157.5
–80
–158.0
–82
–158.5
–14
–13
–12
–11
–10
–9
–8
–7
POUT (dBm)
Figure 36. WCDMA Adjacent and Alternate Channel Power Ratios and
20 MHz Offset Noise Floor vs. Output Power at 1966 MHz; LO Power = 0 dBm
–70
–155.5
–72
ADJACENT CPR
–156.0
–74
–156.5
–76
20MHz NOISE FLOOR
–157.0
–78
–157.5
ALTERNATE CPR
–80
–158.0
–82
–158.5
–14
–13
–12
–11
–10
–9
–8
–7
POUT (dBm)
Figure 37. WCDMA Adjacent and Alternate Channel Power and 20 MHz
Offset Noise Floor vs. Output Power at 2140 MHz; LO Power = 0 dBm
WiMAX OPERATION
Figure 38 demonstrates the ACPR vs. the output power for the
ADL5372 at 2350 MHz. The following test conditions were
applied: a 10 MHz wide 64-QAM OFDM signal with 256
subcarriers, and a raised cosine filter with an α = 0.2.
Data Sheet
–58
–153
–60
–154
–62
–155
–64
–156
–66
ACPR
–157
–68
–158
–70
–159
70MHz OFFSET NOISE FLOOR
–72
–160
–16
–14
–12
–10
–8
–6
–4
–2
OUTPUT POWER (dBm)
Figure 38. WiMAX ACPR and Noise Floor vs. Output Power at 2350 MHz;
LO Power = 0 dBm
LO GENERATION USING PLLS
Analog Devices has a line of PLLs that can be used for generating
the LO signal. Table 4 lists the PLLs together with their maximum
frequency and phase noise performance.
Table 4. Analog Devices PLL Selection Table
Part No.
ADF4110
ADF4111
ADF4112
ADF4113
ADF4116
ADF4117
ADF4118
Frequency, fIN (MHz)
550
1200
3000
4000
550
1200
3000
Phase Noise at 1 kHz Offset
and 200 kHz PFD (dBc/Hz)
−91 at 540 MHz
−87 at 900 MHz
−90 at 900 MHz
−91 at 900 MHz
−89 at 540 MHz
−87 at 900 MHz
−90 at 900 MHz
The ADF4360-0/ADF4360-1/ADF4360-2/ADF4360-3/
ADF4360-4/ADF4360-5/ADF4360-6/ADF4360-7/ADF4360-8
come as a family of chips, with nine operating frequency ranges.
One is chosen, depending on the local oscillator frequency
required. While the use of the integrated synthesizer may come
at the expense of slightly degraded noise performance from the
ADL5372, it can be a cheaper alternative to a separate PLL and
VCO solution. Table 5 shows the options available.
Table 5. ADF4360-0 to ADF4360-8 Family Operating
Frequencies
Part No.
Output Frequency Range (MHz)
ADF4360-0
2400 to 2725
ADF4360-1
2050 to 2450
ADF4360-2
1850 to 2170
ADF4360-3
1600 to 1950
ADF4360-4
1450 to 1750
ADF4360-5
1200 to 1400
ADF4360-6
1050 to 1250
ADF4360-7
350 to 1800
ADF4360-8
65 to 400
Rev. A | Page 16 of 24
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