AD9553 Datasheet, PDF (1/44 Pages) Analog Devices – Flexible Clock Translator for GPON, Base Station, SONET/SDH, T1/E1, and Ethernet

Flexible Clock Translator for GPON, Base
Station, SONET/SDH, T1/E1, and Ethernet
AD9553
FEATURES
Input frequencies from 8 kHz to 710 MHz
Output frequencies up to 810 MHz
Preset pin-programmable frequency translation ratios cover
popular wireline and wireless frequency applications,
including xDSL, T1/E1, BITS, SONET, and Ethernet.
Arbitrary frequency translation ratios via SPI port
On-chip VCO
Accepts a crystal resonator for holdover applications
Two single-ended (or one differential) reference input(s)
Two output clocks (independently programmable as LVDS,
LVPECL, or CMOS)
SPI-compatible, 3-wire programming interface
Single supply (3.3 V)
Very low power: <450 mW (under most conditions)
Small package size (5 mm × 5 mm)
Exceeds Telcordia GR-253 Category II OC-48 jitter
generation, transfer, and tolerance specifications
APPLICATIONS
Cost effective replacement of high frequency VCXO, OCXO,
and SAW resonators
Extremely flexible frequency translation for SONET/SDH,
Gb Ethernet, Fibre Channel, DRFI/DOCSIS, and
PON/EPON/GPON
Wireless infrastructure
Test and measurement (including handheld devices)
GENERAL DESCRIPTION
The AD9553 is a phase-locked loop (PLL) based clock translator
designed to address the needs of passive optical networks (PON)
and base stations. The device employs an integer-N PLL to
accommodate the applicable frequency translation requirements.
The user supplies up to two single-ended input reference signals
or one differential input reference signal via the REFA and REFB
inputs. The device supports holdover applications by allowing the
user to connect a 25 MHz crystal resonator to the XTAL input.
The AD9553 is pin programmable, providing a matrix of
standard input/output frequency translations from a list of 15
possible input frequencies to a list of 51 possible output frequency
pairs (OUT1 and OUT2). The device also has a 3-wire SPI
interface, enabling the user to program custom input-to-output
frequency translations.
The AD9553 output is compatible with LVPECL, LVDS, or
single-ended CMOS logic levels, although the AD9553 is
implemented in a strictly CMOS process.
The AD9553 operates over the extended industrial temperature
range of −40°C to +85°C.
REFA
REFB
XTAL
BASIC BLOCK DIAGRAM
AD9553
INPUT
FREQUENCY
SOURCE
SELECTOR
PLL
OUTPUT
CIRCUITRY
PIN-DEFINED AND SERIAL PROGRAMMING
OUT2
OUT1
Figure 1.
Rev. 0
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