AD9956-VCOSLASHPCB datasheet(7/32 Pages) AD

7 / 32 page

AD9956

Rev. B | Page 7 of 32

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

Latencies/Pipeline Delays7

I/O Update to DAC Frequency Change

SYSCLK Cycles

I/O Update to DAC Phase Change

SYSCLK Cycles

PS<2:0> to DAC Frequency Change

SYSCLK Cycles

PS<2:0> to DAC Phase Change

SYSCLK Cycles

I/O Update to CP_OUT Scaler Change

SYSCLK Cycles

I/O Update to Frequency Accumulator

Step Size Change

SYSCLK Cycles

I/O Update to Frequency Accumulator

Ramp Rate Change

SYSCLK Cycles

RF DIVIDER/CML DRIVER EQUIVALENT

INTRINSIC TIME JITTER

FIN = 414.72 MHz, FOUT = 51.84 MHz

BW = 12 kHz −> 400 kHz

136

fS rms

OC1, RF Divider R = 8

FIN = 1244.16 MHz, FOUT = 155.52 MHz

BW = 12 kHz −> 1.3 MHz

101

fS rms

OC3, RF Divider R = 8

FIN = 2488.32 MHz, FOUT = 622.08 MHz

BW = 12 kHz −> 5 MHz

108

fS rms

OC12, RF Divider R = 4

RF DIVIDER/CML DRIVER RESIDUAL PHASE NOISE

FIN = 157.6 MHz, FOUT = 19.7 MHz

RF Divider R = 8

@ 10 Hz

−115

dBc/Hz

@ 100 Hz

−126

dBc/Hz

@ 1 kHz

−134

dBc/Hz

@ 10 kHz

−143

dBc/Hz

@ 100 kHz

−150

dBc/Hz

> 1 MHz

−151

dBc/Hz

FIN = 1240 MHz, FOUT = 155 MHz

RF Divider R = 8

@ 10 Hz

−111

dBc/Hz

@ 100 Hz

−122

dBc/Hz

@ 1 kHz

−129

dBc/Hz

@ 10 kHz

−138

dBc/Hz

@ 100 kHz

−146

dBc/Hz

@ 1 MHz

−150

dBc/Hz

>3 MHz

−153

dBc/Hz

FIN = 2488MHz, FOUT = 622 MHz

RF Divider R = 4

@ 10 Hz

−97

dBc/Hz

@ 100 Hz

−110

dBc/Hz

@ 1 kHz

−120

dBc/Hz

@ 10 kHz

−126

dBc/Hz

@ 100 kHz

−136

dBc/Hz

@ 1 MHz

−141

dBc/Hz

>3 MHz

−144

dBc/Hz

TOTAL SYSTEM TIME JITTER FOR 622 MHz CLOCK

See the Loop Measurement Condi-

tions section

12 kHz to 5 MHz Bandwidth

0.7

ps rms

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