ADRF6720-27ACPZ-R7 datasheet(29/44 Pages) AD

29 / 44 page

ADRF6720-27

Data Sheet

Rev. B | Page 28 of 43

Figure 55. SSB Output Power, Second- and Third-Order Harmonics, Carrier

Feedthrough, Sideband Suppression, OIP2, and OIP3 vs. Baseband I/Q

Amplitude = 0.6 V p-p Differential for OIP2, and OIP3, 1 V p-p Differential for

POUT, Sideband Suppression, HD2, HD3, Carrier Feedthrough, fOUT =

2140 MHz, 25°C

OPERATING OUT OF FREQUENCY RANGE

The operating frequency range of the ADRF6720-27 can be

extended above 3000 MHz using the external 1x LO through

the polyphase filter. Above the specified RF frequency range of

3000 MHz, loss from internal balun results in output power

drop and output IP2 and IP3 degradation, accordingly. See

Figure 56 for a plot of typical SSB output power, second- and

third-order harmonics, carrier feedthrough, sideband

suppression, OIP2, and OIP3 performance from 3000 MHz to

4000 MHz above operating frequency.

Figure 56. Typical SSB Output Power, Second- and Third-Order Harmonics,

Carrier Feedthrough, Sideband Suppression, OIP2, and OIP3 Performance

Above Operating Frequency; Baseband I/Q Amplitude = 0.6 V p-p Differential

for OIP2, and OIP3, 1 V p-p Differential for POUT, Sideband Suppression, HD2,

HD3, Carrier Feedthrough, 25°C

SPURIOUS PERFORMANCE

Figure 57 to Figure 60 show typical spurious emission of the

PFD harmonics at the RF output (fLO ± N × fPFD). As shown in

Figure 57 to Figure 60, the ADRF6720-27 typically achieves

better than −90 dBc/Hz PFD harmonic spurious emissions at

most offsets. If required, the spurious emission profile shown in

Figure 57 to Figure 60 can be tailored to each individual

application by selecting a combination of PLL reference

frequency, PFD frequency, and LO frequency in order to ensure

that the higher spurious emissions fall out of the band of

interest. For more information, contact application support.

Figure 57. PFD Spurious Emissions on Modulator Output, fLO − N × fPFD;

fLO = 1036.8 MHz, RFOUT ≈ 4 dBm at 25°C, fREF = 61.44 MHz at 4 dBm, fPFD =

15.36 MHz, Integer PLL Mode

Figure 58. PFD Spurious Emissions on Modulator Output, fLO − N × fPFD;

fLO = 1128.96 MHz, RFOUT ≈ 4 dBm at 25°C, fREF = 61.44 MHz at 4 dBm, fPFD =

15.36 MHz, Integer PLL Mode

Figure 59. PFD Spurious Emissions on Modulator Output, fLO + N × fPFD;

fLO = 1658.88 MHz, RFOUT ≈ 4 dBm at 25°C, fREF = 61.44 MHz at 4 dBm, fPFD =

15.36 MHz, Integer PLL Mode

–20

–10

–80

–70

–60

–50

–40

–30

–20

–10

2.4

2.5

2.6

2.7

2.8

2.9

3.0

BASEBAND COMMON-MODE VOLTAGE (V)

SSB OUTPUT POWER (dBm)

OUTPUT IP2 (dBm)

OUTPUT IP3 (dBm)

SIDEBAND SUPPRESSION (dBc)

CARRIER FEEDTHTOUGH (dBm)

SECOND HARMONIC (dBc)

THIRD HARMONIC (dBc)

–10

–70

–60

–50

–40

–30

–20

–10

2800

3000

3200

3400

3600

3800

4000

LO FREQUENCY (MHz)

SSB OUTPUT POWER (dBm)

OUTPUT IP2 (dBm)

OUTPUT IP3 (dBc)

CARRIER FEEDTHROUGH (dBm)

SIDEBAND SUPPRESSION (dBc)

THIRD HARMONIC (dBc)

SECOND HARMONIC (dBc)

FREQUENCY (MHz)

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

700

750

800

850

900

950

1000

1050

N = 1

N = 8

N = 20

TA = –40°C

TA = +25°C

TA = +85°C

FREQUENCY (MHz)

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

800

850

900

950

1000

1050

1100

1150

N = 1

N = 8

N = 20

TA = –40°C

TA = +25°C

TA = +85°C

FREQUENCY (MHz)

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

1650

1700

1750

1800

1850

1900

1950

2000

N = 20

N = 8

N = 1

TA = –40°C

TA = +25°C

TA = +85°C

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