ADL5375-05-EVALZ Analog Devices, ADL5375-05-EVALZ Datasheet - Page 27

• Manufacturer Part Number: ADL5375-05-EVALZ
• Description: RF Development Tools ADL5375-05 EVAL
• Manufacturer: Analog Devices
• Type: Modulators / Demodulatorsr
• Series: ADL5375r

Specifications of ADL5375-05-EVALZ

• Rohs: yes
• Product: Evaluation Boards
• Factory Pack Quantity: 1

Data Sheet
Using the AD9122 DAC For Carrier Feedthrough and
Unwanted Sideband Nulling
The
Register 0x43, Register 0x46, and Register 0x47) or the digital
dc offset adjustments (Register 0x3C through Register 0x3F)
that can be used to null the carrier feedthrough by applying the
dc offset voltage at each main DAC channels. Unwanted
sideband suppression can be done by adjusting the I/Q phase
(Register 0x38 through Register 0x3B) and DAC FS (Register
0x40 and Register 0x44) registers.
GSM/EDGE OPERATION
The performance of the
GSM/EDGE environment is shown in Figure 68 and Figure 69.
Figure 68 illustrates the 6 MHz offset noise floor of the
ADL5375-05
condition vs. output power, and Figure 69 demonstrates IMD
performance of the same six carriers MCGSM/EDGE(8-PSK)
for the
Figure 65, for this measurement. The AD9122 is set at −3 dB
digital FS back off, F
PLL and inverse sync off. Complex IF at 174.32 MHz is generated
at NCO of the AD9122 and fed into the
fifth order Butterworth filter. Special care must be taken not to
be affected by the noise power of images through proper DAC
setup at the selection of IF Frequency, F
such a low IMD and noise level measurement. Be sure to load
clean LO signals and use equipment that allows enough
dynamic range capability and noise correction feature to
compensated the noise originated by equipment itself.
Figure 68.
–73
–74
–75
–76
–77
–78
–79
–80
–81
–82
–83
–84
AD9122
at 950 MHz vs Output Power(1 Carrier/100 KHz), LO Drive = 0 dBm
ADL5375-05
ADL5375-05
–30
at the six carriers MCGSM/EDGE(8-PSK) operating
OUTPUT POWER (1 CARRIER/100kHz) (dBm)
features an auxiliary DACs (Register 0x42,
–28
GSM/EDGE(8-PSK) 6 Carriers 6 MHz Offset Noise Floor
DATA
at 950 MHz. It is configured, as shown at
ADL5375-05
= 368.64 MSPS, 2× interpolation, and
–26
–24
in a Multi-Carriers
DATA
ADL5375-05
, F
DAC
–22
, and so on for
–104.0
–104.5
–105.0
–105.5
–106.0
–106.5
–107.0
–107.5
through a
Rev. B | Page 27 of 36
The performance of the
ment is shown in Figure 70 and Figure 71.
Figure 70 illustrates the 6 MHz offset noise of the
and
demonstrates how the 6 MHz offset noise is affected by variations
in LO drive level for both version of the
Channel Power Performance at 950 MHz; Output Power(1 Carrier/100 KHz) =
Figure 69.
Figure 70. GSM/Edge (8-PSK) 6 MHz Offset Noise at 940 MHz vs. Output
–100
–101
–102
–103
–104
–105
–106
–107
–99
ADL5375-15
–5
ADL5375-05
–4
vs. output power at 940 MHz. Figure 71
GSM/EDGE(8-PSK) 6 Carriers Adjacent and Alternate
−24.4 dBm LO Drive = 0 dBm
ADL5375-05
Power, LO Drive = 0 dBm
ADL5375-15
OUTPUT POWER (dBm)
ADL5375
–3
in a GSM/EDGE environ-
–2
ADL5375
–1
ADL5375-05
ADL5375
at 940 MHz.
0