This document describes the AD9518-0 Rev. C, a 6-output clock generator with an integrated 2.8 GHz VCO. The clock generator features a low phase noise phase-locked loop (PLL) with a tunable range from 2.55 GHz to 2.95 GHz. It also offers an optional external VCO/VCXO up to 2.4 GHz and supports 1 differential or 2 single-ended reference inputs. It accepts LVPECL, LVDS, or CMOS references up to 250 MHz and provides programmable delays and digital or analog lock detect. The device includes 3 pairs of 1.6 GHz LVPECL outputs, each pair sharing a 1-to-32 divider with coarse phase delay. It supports channel-to-channel synchronization and automatic synchronization on power-up. The clock generator is suitable for applications requiring low jitter and low phase noise clock distribution.
The AD9518-0 provides multi‑output clock distribution with sub‑picosecond jitter performance. It features an on‑chip PLL and VCO that tunes from 2.55 GHz to 2.95 GHz, six LVPECL outputs (three differential pairs) up to 1.6 GHz, and programmable delays and lock‑detect options. The device operates from a single 3.3 V supply and can accept LVPECL, LVDS or CMOS reference inputs up to 250 MHz.
Typical applications include high‑speed networking line cards, high‑performance ADC/DAC clocking, wireless transceivers, and test instrumentation. The part is specified for industrial temperature range (‑40 °C to +85 °C) and is available in a 48‑lead LFCSP package.
| VCO Frequency Range | 2.55 GHz – 2.95 GHz |
|---|---|
| Maximum LVPECL Output Frequency | 2.95 GHz |
| Additive Output Jitter | 225 fs rms |
| Channel‑to‑Channel Skew (paired outputs) | <10 ps |
| Supply Voltage (Vs) Typical | 3.3 V |
| Reference Input Frequency Range | 0 – 250 MHz |
| Phase Noise at 100 kHz Offset | ‑105 dBc/Hz |
| Operating Temperature Range | ‑40 °C to +85 °C |
The on‑chip VCO tunes from 2.55 GHz to 2.95 GHz.
The LVPECL outputs can reach up to 2.95 GHz.
The device achieves an additive output jitter of 225 fs rms.
It operates from a 3.3 V supply, with a typical range of 3.135 V to 3.465 V.