AD9517-4ASLASHPCBZ datasheet(48/80 Pages) AD

48 / 80 page

AD9517-4

Data Sheet

Rev. E | Page 48 of 80

910

INPUT TO VCO DIVIDER

INPUT TO CHANNEL DIVIDER

OUTPUT OF

CHANNEL DIVIDER

SYNC PIN

14 TO 15 CYCLES AT CHANNEL DIVIDER INPUT + 1 CYCLE AT VCO DIVIDER INPUT

CHANNEL DIVIDER OUTPUT STATIC

CHANNEL DIVIDER

OUTPUT CLOCKING

CHANNEL DIVIDER

OUTPUT CLOCKING

Figure 57. SYNC Timing When VCO Divider Is Used—CLK or VCO Is Input

INPUT TO CLK

IINPUT TO CHANNEL DIVIDER

OUTPUT OF

CHANNEL DIVIDER

SYNC PIN

14 TO 15 CYCLES AT CHANNEL DIVIDER INPUT + 1 CYCLE AT CLK INPUT

910

CHANNEL DIVIDER OUTPUT STATIC

CHANNEL DIVIDER

OUTPUT CLOCKING

CHANNEL DIVIDER

OUTPUT CLOCKING

Figure 58. SYNC Timing When VCO Divider Is Not Used—CLK Input Only

A sync operation brings all outputs that have not been excluded

(by the nosync bit) to a preset condition before allowing the outputs

to begin clocking in synchronicity. The preset condition takes

into account the settings in each of the channel’s start high bit

and its phase offset. These settings govern both the static state

of each output when the sync operation is happening and the

state and relative phase of the outputs when they begin clocking

again upon completion of the sync operation. Between outputs

and after synchronization, this allows for the setting of phase

offsets.

The AD9517 outputs are in pairs, sharing a channel divider per

pair (two pairs of pairs, four outputs, in the case of CMOS). The

synchronization conditions apply to both outputs of a pair.

Each channel (a divider and its outputs) can be excluded from

any sync operation by setting the nosync bit of the channel.

Channels that are set to ignore SYNC (excluded channels) do

not set their outputs static during a sync operation, and their

outputs are not synchronized with those of the nonexcluded

channels.

Clock Outputs

The AD9517 offers three different output level choices:

LVPECL, LVDS, and CMOS. OUT0 to OUT3 are LVPECL

differential outputs; and OUT4 to OUT7 are LVDS/CMOS

outputs. These outputs can be configured as either LVDS

differential or as pairs of single-ended CMOS outputs.

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