ADRF6821 datasheet(17/61 Pages) AD

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Data Sheet

ADRF6821

Rev. A | Page 17 of 61

PHASE-LOCKED LOOP (PLL) PERFORMANCE

All supply pins = 3.3 V, TA = 25°C, fPFD = 30.72 MHz, fREF = 122.88 MHz, 20 kHz loop filter, measured at LO output, unless otherwise noted.

–10

–110

–90

–80

–40

–140

–60

–160

–70

–30

–130

–50

–150

–20

–120

–170

–100

0.001

0.01

0.1

100

OFFSET FREQUENCY (MHz)

+105°C

+27°C

–40°C

Figure 31. Open-Loop VCO Phase Noise vs. Offset Frequency for Various

Temperatures

–10

–110

–90

–80

–40

–140

–60

–160

–70

–30

–130

–50

–150

–20

–120

–170

–100

0.001

0.01

0.1

100

OFFSET FREQUENCY (MHz)

VCO = 4GHz

VCO = 4.7GHz

VCO = 5.6GHz

VCO = 6.8GHz

Figure 32. Open-Loop VCO Phase Noise vs. Offset Frequency for Various

VCO Frequencies

–60

–110

–90

–80

–140

–160

–70

–130

–150

–120

–170

–100

0.001

0.01

0.1

100

OFFSET FREQUENCY (MHz)

Figure 33. Closed-Loop Phase Noise vs. Offset Frequency for fLO = 1765 MHz

–60

–110

–90

–80

–140

–160

–70

–130

–150

–120

–170

–100

0.001

0.01

0.1

100

OFFSET FREQUENCY (MHz)

Figure 34. Closed-Loop Phase Noise vs. Offset Frequency for fLO = 2350 MHz

–60

–110

–90

–80

–140

–160

–70

–130

–150

–120

–170

–100

0.001

0.01

0.1

100

OFFSET FREQUENCY (MHz)

Figure 35. Closed-Loop Phase Noise vs. Offset Frequency for fLO = 2720 MHz

–170

–250

–240

–200

–220

–230

–190

–210

–180

–270

–260

450

920

1860

1390

2330

2800

LO FREQUENCY (MHz)

+105°C

+27°C

–40°C

FRACTIONAL

FLICKER

Figure 36. PLL Figure of Merit (FOM) vs. LO Frequency

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