General Description
The 810N322I-02 device uses IDT's fourth generation FemtoClock®
NG technology for optimal high clock frequency and low phase noise
performance, combined with a low power consumption and high
power supply noise rejection. The 810N322I-02 is a PLL based
synchronous multiplier that is optimized for Ethernet to SONET/PDH
clock jitter attenuation and frequency translation.
The 810N322I-02 is a fully integrated Phase Locked loop utilizing a
FemtoClock NG Digital VCXO that provides the low jitter, high
frequency SONET/PDH output clock that easily meets OC-48 jitter
requirements. This VCXO technology simplifies PLL design by
replacing the pullable crystal requirement of analog VCXOs with a
fixed 27MHz generator crystal. Jitter attenuation down to 9Hz is
provided by an external loop filter. Pre-divider and output divider
multiplication ratios are selected using device selection control pins.
The multiplication ratios are optimized to support most common
clock rates used in PDH, SONET and Ethernet applications. The
device requires the use of an external, inexpensive fundamental
mode 27MHz crystal. The device is packaged in a space-saving
32-VFQFN package and supports commercial temperature range.

Features
• Fourth generation FemtoClock® NG technology
• Two LVCMOS outputs
• Each output supports independent frequency selection at
19.44MHz, 77.76MHz, 155.52MHz and 622.08MHz
• Two differential inputs support the following input types: LVPECL,
LVDS, LVHSTL, HCSL
• Accepts input frequencies from 8kHz to 156.25MHz including
8kHz,19.44MHz, 25MHz, 62.5MHz, 77.76MHz, 125MHz,
155.52MHz and 156.25MHz
• Crystal interface designed for a 27MHz, 10pF crystal
• Attenuates the phase jitter of the input clock by using a low-cost
fundamental mode crystal
• Customized settings for jitter attenuation and reference tracking
using an external loop filter connection
• FemtoClock NG frequency multiplier provides low jitter, high
frequency output
• Absolute pull range: ±50ppm
• Power supply noise rejection (PSNR): -55 (typical)
• FemtoClock NG VCXO frequency: 2488.32MHz
• RMS phase jitter @ 155.52MHz, using a 27MHz crystal
(12kHz – 20MHz):0.624ps (typical)
• 3.3V supply voltage
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) package