AD9544SLASHPCBZ datasheet(34/62 Pages) AD

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AD9544

Data Sheet

Rev. 0 | Page 34 of 62

SMALL CELL BASE STATION

In this application (shown in Figure 42), the AD9544 provides

all of the synchronization to the baseband unit of a small cell

base station. The built in JESD204B support enables a particu-

larly compact and efficient design.

The AD9544 can lock to any of the following: GPS, SyncE, or

loop timed (if using SONET/SDH or passive optical network

backhaul). The PLL0 of the AD9544 provides one device clock

and up to four device system reference clocks that can be used

to clock wireless transceivers, such as the AD9371.

The PLL1 of the AD9544 clocks the backhaul interface and,

optionally, the CPU interface.

The EEPROM support of the AD9544 allows the AD9544 to

load its configuration automatically at power-up.

SYSTEM

CLOCK PLL

STATUS AND

CONTROL PINS

AD9544

TEMPERATURE

SENSOR

SYSTEM CLOCK

COMPENSATION

REFERENCE

SWITCHING

CONTROL

REFERENCE

MONITORS

TDC

REFERENCE

INPUTS

NCO

DPLL

DPLL0

PLL

APLL0

VCO

NCO

DPLL

DPLL1

PLL

APLL1

VCO

PLL0

PLL1

DISTRIBUTION

OUTPUTS

DISTRIBUTION

OUTPUTS

÷2

÷Q

÷R

OUT0AP,

OUT0AN,

OUT0BP,

OUT0BN,

OUT0CP,

OUT0CN

OUT1AP,

OUT1AN,

OUT1BP,

OUT1BN

XOA,

XOB

INTERNAL ZERO DELAY

EEPROM

(OPTIONAL)

SYSTEM

CLOCK

DIGITAL

CROSS

POINT

MUX

SERIAL PORT (SPI/I2C)

AND EEPROM

CONTROLLER

M0 TO M6

REFA,

REFAA,

REFB,

REFBB

÷2

÷Q

INPUT

GPS, LOOP TIMED

FROM NETWORK

SyncE

RADIO

(2 CARDS)

EXTERNAL

NETWORK

ETHERNET

SyncE

PASSIVE OPTICAL NETWORK

SONET/SDH

SYSREF TO

RADIO 1

SYSREF TO

RADIO 2

SYSREF TO

BASEBAND

1:4

FANOUT

BASEBAND

PROCESSOR

NETWORK

CONNECTION

30.72MHz

61.44MHz

122.88MHz

245.76MHz

307.2MHz

10MHz

25MHz

125MHz

156.25MHz

312.5MHz

30.72MHz

61.44MHz

122.88MHz

JESD204B SUPPORT

SERIAL PORT

Figure 42. Small Cell Application

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