ADRF6510ACPZ-WP Analog Devices Inc, ADRF6510ACPZ-WP Datasheet - Page 19

• 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

APPLICATIONS INFORMATION
BASIC CONNECTIONS
Figure 48 shows the basic connections for operating the
ADRF6510. A voltage from 4.75 V to 5.25 V should be applied
to the supply pins. Each supply pin should be decoupled with at
least one low inductance, surface-mount ceramic capacitor of
0.1 μF placed as close as possible to the device.
The input buffers provide an interface to the sensitive filter
sections that follow. They set a differential input impedance
of 400 Ω and sit at a nominal common-mode voltage of VPS/2.
The inputs can be dc-coupled or ac-coupled. If using direct
dc-coupling, the common-mode voltage, V
1.5 V to 3 V.
The output buffers of the ADRF6510 are low impedance
(~20 Ω) designed to drive either ADC inputs or subsequent
amplifier stages. The output common-mode voltage defaults to
VPS/2 but can be adjusted from 1.5 V to 3.0 V without loss of
drive capability by presenting the VOCM pin with the desired
common-mode voltage. The high input impedance of VOCM
allows the ADC reference output to be connected directly.
To enable the ADRF6510, the ENBL pin must be pulled high.
Taking ENBL low disables the device, reducing current con-
sumption to approximately 2 mA at ambient temperature.
INPUT2(–)
INPUT1(–)
INPUT2(+)
INPUT1(+)
VPSD
VPS
0.1µF
0.1µF
VPS
CM
, can range from
VPSD
COMD
LE
CLK
DATA
SDO
COM
VPS
R2
VPS
VPS
0.1µF
ADRF6510
Figure 48. Basic Connections
0.1µF
Rev. 0 | Page 19 of 28
VPS
VPS
OPP1
OPM1
COM
GAIN
VOCM
COM
OPM2
OPP2
ERROR VECTOR MAGNITUDE (EVM) PERFORMANCE
Error vector magnitude (EVM) is a measure used to quantify
the performance of a digital radio transmitter or receiver. A
signal received by a receiver has all constellation points at their
ideal locations; however, various imperfections in the implemen-
tation (such as magnitude imbalance, noise floor, and phase
imbalance) cause the actual constellation points to deviate from
their ideal locations.
In general, a receiver exhibits three distinct EVM limitations
vs. received input signal power.
•
•
•
0.1µF
0.1µF
VPS
0.1µF
VPS
At strong signal levels, the distortion components falling
in-band due to nonlinearities in the device components
cause strong degradation to EVM as signal levels increase.
At medium signal levels, where the signal chain behaves
in a linear manner and the signal is well above any notable
noise contributions, EVM has a tendency to reach an
optimum level determined dominantly by the quadrature
accuracy and the precision of the test equipment. As signal
levels decrease such that noise is a major contribution, the
EVM performance vs. the signal level exhibits a decibel-
for-decibel degradation with decreasing signal level.
At lower signal levels, where noise proves to be the domi-
nant limitation, the decibel EVM proves to be directly
proportional to the SNR.
0.1µF
OUTPUT2(–)
OUTPUT2(+)
OUTPUT1(–)
OUTPUT1(+)
ADRF6510