ADRF6510ACPZ-R7 datasheet(19/28 Pages) AD

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ADRF6510

Rev. 0 | Page 19 of 28

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, VCM, can range from

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.

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.

•

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.

VPSD

COMD

CLK

DATA

SDO

COM

VPS

OPP1

OPM1

COM

GAIN

VOCM

COM

OPM2

OPP2

COM

INP2

INM2

VPS

COM

OFDS

OFS2

VPS

ENBL

INP1

INM1

VPS

COM

GNSW

OFS1

VPS

ADRF6510

VPS

VPSD

0.1µF

VPS

OUTPUT1(+)

INPUT1(–)

0.1µF

INPUT1(+)

INPUT2(+)

INPUT2(–)

OUTPUT1(–)

OUTPUT2(–)

OUTPUT2(+)

0.1µF

VPS

Figure 48. Basic Connections

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