DS3105DK Maxim Integrated Products, DS3105DK Datasheet - Page 10

Manufacturer Part Number

DS3105DK

Description

Power Management Modules & Development Tools Demo Kit for DS3105 Demo Kit for DS3105

Manufacturer

Maxim Integrated Products

Datasheet

1.DS3105DK.pdf (34 pages)

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

_________________________________________________________________________________________DS3105DK

4.3

T0 DPLL

The state of the T0 DPLL (free-run, locked, holdover, etc.) is shown in the STATE text box. The STATE and

SRFAIL buttons represent latched status bits in the device. When the button is red, the corresponding latched

status bit has been set in the DS3105. Pressing the button clears the latched status bit and changes the color of

the button back to green. The STATE button indicates that the state of the T0 DPLL has changed since the last

time the button was pressed. SRFAIL indicates that the selected reference has failed since the last time the button

was pressed.

The state of the T0 DPLL can be forced using the combo box to the left of the STATE text box, and the selected

reference can be forced using the CLK SEL field. Below the CLK SEL field is a field that configures the T0 DPLL

for revertive or non-revertive input reference switching.

The frequency of the T0 DPLL is displayed in the FREQ field (fixed at 77.76MHz for the DS3105 T0 DPLL). The

acquisition and locked bandwidths are set by the ABW and LBW fields, respectively, and the damping factor is set

by the DAMP field. The acquisition bandwidth is only used if AUTOBW is checked. If the frequency of the T0

DPLL’s selected reference exceeds the SOFT LIMIT setting (in the DPLL FREQUENCY LIMITS box at the top of

the main window), the SOFTLIM LED turns red.

The PALARM status LED and the PHASE MONITOR AND BUILDOUT fields are advanced topics. See

Table 4-2

and the DS3105 data sheet for more details. Clicking the More button opens another window (see

Figure

4-3) with

additional T0 DPLL configuration and status fields.

Figure 4-3. Software T0 DPLL Window

Rev: 012808

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