AD9546SLASHPCBZ datasheet(77/205 Pages) AD

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Data Sheet

AD9546

Rev. 0 | Page 77 of 205

REFERENCE CLOCK INPUT RESOURCES

The AD9546 has eight reference clock inputs as shown in

Figure 59. The eight inputs comprise two groups of four:

•

Four primary reference inputs (REFA, REFAA, REFB, and

REFBB)

•

Four auxiliary reference inputs (auxiliary REF0, auxiliary

REF1, auxiliary REF2, and auxiliary REF3)

The two groups are functionally identical except for the

configuration of their input receivers.

The primary reference inputs have configurable input receivers

(see the Reference Receivers section) and dedicated pins. The

user can configure the REFA and REFAA inputs as a single

differential receiver or as two independent, single-ended

receivers. The REFB and REFBB inputs can be configured

likewise.

The auxiliary reference clock inputs have nonconfigurable,

single-ended CMOS receivers, and rather than having

dedicated pins, they are accessible only through Mx Pins (see

the Status and Control Pins section).

Each reference clock input has a dedicated reference monitor,

reference divider (R divider), TDC, and reference demodulator.

AD9546

TIME STAMPS

REFA

REFAA

REFB

REFBB

TIME STAMPS

AUX REF0

AUX REF1

AUX REF2

AUX REF3

SDO/M5

CSB/M6

DEMOD

TDC

REF

MON

÷R

DEMOD

REF

MON

DEMOD

TDC

REF

MON

÷R

DEMOD

REF

MON

DEMOD

TDC

REF

MON

÷R

Mx PIN

FUNCTION

LOGIC

Figure 59. Reference Inputs Block Diagram

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