AD9548 datasheet(19/111 Pages) AD

19 / 111 page

Data Sheet

AD9548

–160

–150

–140

–130

–120

–110

–100

–90

–80

–70

100

10k

100k

10M

100M

FREQUENCY OFFSET (Hz)

INTEGRATED RMS JITTER (PHASE NOISE):

5kHz TO 20MHz: 361fs (–69.0dBc)

20kHz TO 80MHz: 441fs (–67.3dBc) (EXTRAPOLATED)

Figure 7. Absolute Phase Noise (Output Driver = LVPECL),

fR = 19.44 MHz, fO = 155.52 MHz,

LBW = 1 kHz, fSYS = 50 MHz, PLL On

–160

–150

–140

–130

–120

–110

–100

–90

–80

–70

100

10k

100k

10M

100M

FREQUENCY OFFSET (Hz)

INTEGRATED RMS JITTER (PHASE NOISE):

5kHz TO 10MHz: 717fs (–65.1dBc)

12kHz TO 20MHz: 725fs (–65.0dBc)

20kHz TO 80MHz: 790fs (–64.3dBc)

Figure 8. Absolute Phase Noise (Output Driver = LVPECL),

fR = 1 Hz, fO = 122.88 MHz,

LBW = 0.05 Hz, fSYS = 20 MHz (OCXO), PLL On

100

10k

100k

10M

100M

FREQUENCY OFFSET (Hz)

–160

–150

–140

–130

–120

–110

–100

–90

–80

–70

INTEGRATED RMS JITTER (PHASE NOISE):

5kHz TO 20MHz: 336fs (–69.7dBc)

20kHz TO 80MHz: 425fs (–67.6dBc) (EXTRAPOLATED)

Figure 9. Absolute Phase Noise (Output Driver = LVPECL),

fR = 8 kHz, fO = 155.52 MHz,

LBW = 100 Hz, fSYS = 50 MHz (Crystal), PLL On

–160

–150

–140

–130

–120

–110

–100

–90

–80

–70

100

10k

100k

10M

100M

FREQUENCY (Hz)

ROHDE & SCHWARZ

SMA100 (1GHz)

ROHDE & SCHWARZ

SMA100 (50MHz)

50MHz CRYSTAL

Figure 10. Absolute Phase Noise Comparison of SYSCLK Input Options

(Output Driver = LVPECL),

fR = 19.44 MHz, fO = 311.04 MHz, LBW = 1 kHz

–160

–150

–140

–130

–120

–110

–100

–90

–80

–70

100

10k

100k

10M

100M

FREQUENCY OFFSET (Hz)

INTEGRATED RMS JITTER (PHASE NOISE):

5kHz TO 20MHz: 356fs (–69.2dBc)

20kHz TO 80MHz: 435fs (–67.4dBc) (EXTRAPOLATED)

Figure 11. Absolute Phase Noise (Output Driver = LVPECL),

fR = 1 Hz, fO = 155.52 MHz,

LBW = 0.05 Hz, fSYS = 50 MHz, PLL On

–160

–150

–140

–130

–120

–110

–100

–90

–80

–70

100

10k

100k

10M

100M

FREQUENCY OFFSET (Hz)

INTEGRATED RMS JITTER (PHASE NOISE):

5kHz TO 20MHz: 245fs (–72.4dBc)

20kHz TO 80MHz: 300fs (–64.3dBc) (EXTRAPOLATED)

Figure 12. Absolute Phase Noise (Output Driver = LVPECL),

fR = 19.44 MHz, fO = 155.52 MHz,

LBW = 1 kHz, fSYS = 50 MHz (Crystal), PLL On with

2x Frequency Multiplier, ICP = 375 μA, LF = External (350 kHz)

Rev. G | Page 19 of 111

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