ZL30791, ZL30795, ZL30793
IEEE 1588 & Synchronous Ethernet
Packet Clock Network Synchronizers
Product Brief
August 2019
Features
Ordering Information
• One, Two or Three DPLL Channels
ZL30791LFG7 1-Channel 80-lead LGA Trays
ZL30795LFG7 2-Channel 80-lead LGA Trays
ZL30793LFG7 3-Channel 80-lead LGA Trays
• Packet and/or physical-layer frequency, phase
and time synchronization
• Physical-layer compliance with ITU-T G.8262,
G.8262.1, G.813, G.812, Telcordia GR-1244,
GR-253
NiAu (Pb-free)
Package size: 11 x 11 mm
-40 C to +85 C
• Packet-timing compliance with ITU-T G.8261,
G.8263, G.8273.2 (class A,B,C&D), G.8273.4
• Per-output programmable duty cycle
• Enables 5G wireless applications with sub-
• Precise output alignment circuitry and per-
100ns time/phase alignment requirements
output phase adjustment
• Programmable bandwidth, 0.1mHz to 470Hz
• Hitless reference switching and mode switching
• High-resolution holdover averaging
• Per-output enable/disable and glitchless
start/stop (stop high or low)
• Local Oscillator
• Programmable phase slope limit for transients,
• Operates from a single TCXO or OCXO: 23.75-
downto 1 ns/s
25MHz, 47.5-50MHz, 114.285-125MHz
• Per-DPLL phase adjustment, 1ps resolution
• Very-low-jitter applications can connect a TCXO
or OCXO as the stability reference and a low-
jitter XO as the jitter reference
• Input Clocks
• Accepts up to 10 differential or CMOS inputs
• Any input frequency from 0.5Hz to 900MHz
• Per-input activity and frequency monitoring
• Automatic or manual reference switching
• Fast lock to 1 PPS input, <30 seconds
• General Features
• Automatic self-configuration at power-up from
internal Flash memory
• Input-to-output alignment <2ns
• Internal compensation (1ppt) for local oscillator
• Any input can be a 1PPS SYNC input for
frequency error in DPLLs and input monitors
REF+SYNC frequency/phase/time locking
• Numerically controlled oscillator behavior in
• Any input can be a clock with embedded 1PPS
• Per-input phase adjustment, 1ps resolution
each DPLL and each fractional output divider
• Programmable Time of Day counters
• Output Clock Frequency Generation
• Easy-to-configure design requires no external
VCXO or loop filter components
• Any output frequency from <0.5Hz to 1045MHz
(180MHz max for Synth0)
• 7 GPIO pins with many possible behaviors
• SPI or I2C processor Interface
• High-resolution fractional frequency conversion
with 0ppm error
• 1.8V and 3.3V core VDD voltages
• Synthesizers 1 & 2 have integer and fractional
• Power: 1.3W for 2 inputs, 1 synth, 6 LVDS out
• Easy-to-use evaluation/programming software
• Factory programmable power-up configuration
dividers to make a total of 5 frequency families
• Output jitter from Synths 1 & 2 is <0.3ps RMS
• Output jitter from fractional dividers is typically
< 1ps RMS, many frequencies <0.5ps RMS
Applications
• Each HPOUTP/N pair can be LVDS, LVPECL,
•
Central system timing ICs for SyncE and/or
IEEE 1588, SONET/SDH, OTN, wireless base
station and other carrier-grade systems
HCSL, 2xCMOS, HSTL or programable diff.
• Four output banks each with VDDO pin; CMOS
output voltages from 1.5V to 3.3V
•
G.8262/813 EEC/SEC, Telcordia Stratum 2-4
• Per-synthesizer phase adjust, 1ps resolution
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