描述 Description

The 813N2532 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 813N2532 is a PLL based synchronous multiplier that is optimized for PDH or SONET to Ethernet clock jitter attenuation and frequency translation. The 813N2532 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.

特性 Features

? Fourth generation FemtoClock? NG technology
? Two LVPECL output pairs
? Output frequencies: 19.44MHz, 25MHz, 125MHz, 155.52MHz and 156.25MHz
? Two differential inputs support the following input types: LVPECL, LVDS, LVHSTL, HCSL
? Accepts input frequencies from 8kHz to 38.88MHz including 8kHz, 19.44MHz, 25MHz and 38.88MHz
? Crystal interface optimized 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 external loop filter connection
? FemtoClock NG frequency multiplier provides low jitter, high frequency output
? Absolute pull range: ±100ppm
? Power supply noise rejection (PSNR): -95dB (typical)
? RMS phase jitter @ 156.25MHz, using a 27MHz crystal (12kHz - 20MHz): 0.6ps (typical)
? RMS phase jitter @ 155.52MHz, using a 27MHz crystal (12kHz - 20MHz): 0.622ps (typical)
? RMS phase jitter @ 125MHz, using a 27MHz crystal (12kHz - 20MHz): 0.6ps (typical)
? 3.3V supply voltage
? 0°C to 70°C ambient operating temperature
? Available in lead-free (RoHS 6) package