The 813N322-02 device uses Renesas' 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 813N322-02 is a PLL based synchronous multiplier that is optimized for Ethernet to SONET/PDH clock jitter attenuation and frequency translation.
The 813N322-02 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 10Hz 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 industrial temperature range.
Features
Fourth Generation FemtoClock® NG technology
Two LVPECL output pairs
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 parallel resonant 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): -95dB (typical)
FemtoClock NG VCXO frequency: 2488.32MHz
RMS phase jitter @ 155.52MHz, using a 27MHz crystal (12kHz '- 20MHz): 0.674ps (typical)
3.3V supply voltage
0°C to 70°C ambient operating temperature
Available in lead-free (RoHS 6) package
Comparison
Applications
Documentation
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Models
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