ADF4157 datasheet(7/20 Pages) AD

7 / 20 page

ADF4157

Rev. 0 | Page 7 of 20

TYPICAL PERFORMANCE CHARACTERISTICS

PFD = 25 MHz, loop bandwidth = 20 kHz, reference = 100 MHz, ICP = 313 μA, phase noise measurements taken on the Agilent E5052A

phase noise system.

–40

FREQUENCY (GHz)

–5

–10

–15

–20

–25

–30

–35

1234

5678

P = 4/5

P = 8/9

6.00

5.65

–100

900

TIME (µs)

5.95

5.90

5.85

5.80

5.75

5.70

100

200

300

400

500

600

700

800

CSR OFF

CSR ON

Figure 5. RF Input Sensitivity

Figure 8. Lock Time for 200 MHz Jump from 5705 MHz to 5905 MHz

with CSR On and Off

–40

0500

5.65

5.60

5.95

5.90

5.85

5.80

5.75

5.70

–100

900

TIME (µs)

FREQUENCY (MHz)

100

200

300

400

VDD = 3V

–5

–10

–15

–20

–25

–30

–35

CSR ON

100

200

300

400

500

600

700

800

CSR OFF

Figure 9. Lock Time for 200 MHz Jump from 5905 MHz to 5705 MHz

with CSR On and Off

Figure 6. Reference Input Sensitivity

–160

10M

FREQUENCY (Hz)

–20

–40

–60

–80

–100

–120

–140

10k

100k

RF = 5800.25MHz, PFD = 25MHz, N = 232,

FRAC = 335544, FREQUENCY RESOLUTION = 0.74Hz,

20kHz LOOP BW, ICP = 313µA, DSB INTEGRATED PHASE

ERROR = 0.97° RMS, PHASE NOISE @ 2kHz = –87dBc/Hz.

–6

VCP (V)

–2

–4

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

Figure 10. Charge Pump Output Characteristics, Pump Up and Pump Down

Figure 7. Phase Noise and Spurs

(Note that the 250 kHz spur is an integer boundary spur; see the Spur

Mechanisms section for more information.)

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