DSC2044 Low-Jitter Configurable Dual HCSL Oscillator General Description Features The DSC2044 series of high performance Low RMS Phase Jitter: <1 ps (typ) dual output oscillators utilize a proven silicon High Stability: 10, 25, 50 ppm MEMS technology to provide excellent jitter and stability while incorporating additional Wide Temperature Range device functionality. The two outputs are o Industrial: -40 to 85 C controlled by separate supply voltages to o Ext. commercial: -20 to 70 C allow for high output isolation. The High Supply Noise Rejection: -50 dBc frequencies of the outputs can be identical or independently derived from a common PLL Two Independent HCSL Outputs frequency source. The DSC2044 has Pin-Selectable Configurations provision for up to eight user-defined pre- o 3-bit Output Frequency Combinations programmed, pin-selectable output frequency combinations. Short Lead Times: 2 Weeks Wide Freq. Range: DSC2044 is packaged in a 14-pin 3.2x2.5 mm QFN package and available in o HCSL Output: 2.3 460 MHz temperature grades from Ext. Commercial to Miniature Footprint of 3.2x2.5mm Industrial. Excellent Shock & Vibration Immunity o Qualified to MIL-STD-883 High Reliability o 20x better MTF than quartz oscillators Supply Range of 2.25 to 3.6 V Block Diagram Lead Free & RoHS Compliant Applications Storage Area Networks o SATA, SAS, Fibre Channel Passive Optical Networks o EPON, 10G-EPON, GPON, 10G-PON Ethernet o 1G, 10GBASE-T/KR/LR/SR, and FCoE HD/SD/SDI Video & Surveillance PCI Express DSC2044 Page 1 MK-Q-B-P-D-12042614-2 Low-Jitter Configurable Dual HCSL Oscillator DSC2044 Pin Description Pin No. Pin Name Pin Type Description 1 Enable I Enables outputs when high and disables when low 2 NC NA Leave unconnected or grounded 3 NC NA Leave unconnected or grounded 4 GND Power Ground 5 FS0 I Least significant bit for frequency selection 6 FS1 I Middle bit for frequency selection 7 FS2 I Most significant bit for frequency selection 8 Output1+ O Positive HCSL Output 1 9 Output1- O Negative HCSL Output 1 10 Output 2- O Negative HCSL Output 2 11 Output 2+ O Positive HCSL Output 2 12 VDD2 Power Power Supply for HCSL Output 2 13 VDD Power Power Supply 14 NC NA Leave unconnected or grounded Operational Description The DSC2044 is a dual output HCSL oscillator coefficients required by the PLL for up to eight consisting of a MEMS resonator and a support different frequency combinations. Three PLL IC. The two outputs are generated control pins (FS0 FS2) select the output through independent 8-bit programmable frequency combination. Discera supports dividers from the output of the internal PLL. customer defined versions of the DSC2044. Two constraints are imposed on the output Standard frequency options are described in in frequencies: 1) f =M x f /N, where M and N the following sections. 2 1 are even integers between 4 and 254, 2) When Enable (pin 1) is floated or connected to 1.2GHz < N x f < 1.7GHz. 2 VDD, the DSC2044 is in operational mode. The actual frequencies output by the DSC2044 Driving Enable to ground will tri-state both are controlled by an internal pre-programmed output drivers (hi-impedance mode). memory (OTP). This memory stores all DSC2044 Page 2 MK-Q-B-P-D-12042614-2