Crystal-to-LVCMOS/LVTTL Frequency Synthesizer
FemtoClocks™ Crystal-to-LVCMOS/ LVTTL Frequency Synthesizer
840002I
DATASHEET
GENERAL DESCRIPTION
The 840002I is a 2 o...
Description
FemtoClocks™ Crystal-to-LVCMOS/ LVTTL Frequency Synthesizer
840002I
DATASHEET
GENERAL DESCRIPTION
The 840002I is a 2 output LVCMOS/LVTTL Synthesizer optimized to generate Fibre Channel reference clock frequencies. Using a 26.5625MHz 18pF parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (F_SEL1:0): 212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, and 53.125MHz. The 840002I uses IDT’s 3rd generation low phase noise VCO technology and can achieve 1ps or lower typical rms phase jitter, easily meeting Fibre Channel jitter requirements. The 840002I is packaged in a 16-pin TSSOP package.
FREQUENCY SELECT FUNCTION TABLE
FEATURES
Two LVCMOS outputs @ 3.3V, 17Ω typical output impedance
Selectable crystal oscillator interface or LVCMOS single-ended input
Output frequency range: 46.66MHz - 233.33MHz
VCO range: 560MHz - 700MHz
Supports the following output frequencies: 212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz
RMS phase jitter @ 212.5MHz (637KHz - 10MHz): 0.83ps (typical)
Typical phase noise at 212.5MHz:
Offset
Noise Power
100Hz ................-91.3 dBc/Hz 1KHz ..............-114.3 dBc/Hz 10KHz ..............-120.7 dBc/Hz 100KHz ..............-120.2 dBc/Hz
Power supply modes: Core/Output 3.3V/3.3V 3.3V/2.5V 2.5V/2.5V
-40°C to 85°C ambient operating temperature
Lead-Free package RoHS compliant
Input Frequency
(MHz)
F_SEL1
26.5625
0
26.5625
0
26.5625
1
26.5625
1
26.04166
0
BL...
Similar Datasheet