ADRF6510ACPZ-WP Analog Devices Inc, ADRF6510ACPZ-WP Datasheet - Page 18

• Manufacturer Part Number: ADRF6510ACPZ-WP
• Manufacturer: Analog Devices Inc

Specifications of ADRF6510ACPZ-WP

• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 32
• Lead Free Status / RoHS Status: Supplier Unconfirmed

ADRF6510
The most challenging scenario in terms of dynamic range is the
presence of a large out-of-band blocker accompanying a weaker
in-band wanted signal. In this case, the maximum input level is
dictated by the blocker and its inclination to cause distortion.
After filtering, the weak wanted signal must be amplified to the
desired output level, possibly requiring maximum gain. Both
the distortion limits associated with the blocker at the input and
the SNR limits created by the weaker signal and higher gains are
present simultaneously. Furthermore, not only does the blocker
scenario degrade the dynamic range, it also reduces the range of
input signals that can be handled because a larger part of the
gain range is used to simply extract the weak desired signal
from the stronger blocker.
KEY PARAMETERS FOR QUADRATURE-BASED
RECEIVERS
The majority of digital communication receivers makes use of
quadrature signaling, in which bits of information are encoded
onto pairs of baseband signals that then modulate in-phase (I)
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and quadrature (Q) sinusoidal carriers. Both the baseband and
modulated signals appear quite complex in the time domain with
dramatic peaks and valleys. In a typical receiver, the goal is to
recover the pair of quadrature baseband signals in the presence
of noise and interfering signals after quadrature demodulation.
In the process of filtering out-of-band noise and unwanted inter-
ferers and restoring the levels of the wanted I and Q baseband
signals, it is critical to retain their gain and phase integrity over
the bandwidth.
The ADRF6510 delivers flat in-band gain and group delay,
consistent with a six-pole Butterworth prototype filter as
described in the Programmable Filters section. Furthermore,
careful design ensures excellent matching of these parameters
between the I and Q channels. Although absolute gain flatness
and group delay can be corrected with digital equalization,
mismatch introduces quadrature errors and intersymbol inter-
ference that degrade bit error rates in digital communication
systems.