CDCE62005 datasheet(19/76 Pages) TI

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PHASE NOISE ANALYSIS

CDCE62005

www.ti.com........................................................................................................................................................................................... SCAS862 – NOVEMBER 2008

Table 1. Device Output Phase Noise for 30.72 MHz External Reference

Phase Noise Specifications under following configuration: VCO = 1966.08 MHz, REF = 30.72 MHz,

PFD Frequency = 30.72 MHz, Charge Pump Current = 1.5 mA Loop BW = 400 kHz at 3.3 V and 25°C

Phase Noise

Reference 30.72

LVPECL 491.52

LVDS

LVCMOS

Unit

MHz

122.88

491.52 MHz

MHz

10 Hz

-108

–81

–92

dBc/Hz

100 Hz

-130

–94

–96

–108

dBc/Hz

1 kHz

-134

–106

–118

dBc/Hz

10 kHz

-152

–119

–132

dBc/Hz

100 kHz

-156

–121

–122

–134

dBc/Hz

1 MHz

-157

–131

–143

dBc/Hz

10 MHz

—

–145

–144

–150

dBc/Hz

20 MHz

—

–145

–144

–150

dBc/Hz

Jitter(RMS)

193

307

315

377

10k~20 MHz

Table 2. Device Output Phase Noise for 25 MHz Crystal Reference

Phase Noise Specifications under following configuration: VCO = 2000.00 MHz, AUX-REF = 25.00

MHz,

PFD Frequency = 25.00 MHz, Charge Pump Current = 1.5 mA Loop BW = 400 kHz at 3.3 V and 25°C

Phase Noise

Referenc

LVPECL 500 MHz

LVDS 250 MHz

LVCMOS 125 MHz

Unit

e 25 MHz

10 Hz

—

-57

-62

-68

dBc/Hz

100 Hz

—

-90

-95

-102

dBc/Hz

1 kHz

—

-107

-113

-119

dBc/Hz

10 kHz

—

-115

-122

-128

dBc/Hz

100 kHz

—

-118

-124

-130

dBc/Hz

1 MHz

—

-130

-137

-143

dBc/Hz

10 MHz

—

-145

-147

-150

dBc/Hz

20 MHz

—

-145

-147

-150

dBc/Hz

Jitter(RMS)

389

405

437

10k~20 MHz

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