DSC2040FE1-D0001 Microchip

DSC2040 Low-Jitter Configurable HCSL Oscillator General Description Features The DSC2040 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 DSC2040 has 4 Pin-Selectable Output Frequencies provision for up to eight user-defined pre- programmed, pin-selectable output Short Lead Times: 2 Weeks frequency combinations. Wide Freq. Range: DSC2040 is packaged in a 14-pin 3.2x2.5 o HCSL Output: 2.3 to 460 MHz mm QFN package and available in Miniature Footprint of 3.2x2.5mm temperature grades from Ext. Commercial to Excellent Shock & Vibration Immunity Industrial. o Qualified to MIL-STD-883 High Reliability o 20x better MTF than quartz oscillators Supply Range of 2.25 to 3.6 V Lead Free & RoHS Compliant Block Diagram 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 DSC2040 Page 1 MK-Q-B-P-D-12042610-2 Low-Jitter Configurable HCSL Oscillator DSC2040 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 Most significant bit for frequency selection 7 NC NA Leave unconnected or grounded 8 Output+ O Positive HCSL Output 9 Output- O Negative HCSL Output 10 NC NA Leave unconnected or grounded 11 NC NA Leave unconnected or grounded 12 VDD2 Power Power Supply 13 VDD Power Power Supply 14 NC NA Leave unconnected or grounded Operational Description The DSC2040 is a HCSL oscillator consisting of different frequencies. Two control pins (FS0 a MEMS resonator and a support PLL IC. The FS1) select the output frequency. Discera HCSL output is generated through supports customer defined versions of the independent 8-bit programmable dividers from DSC2040. Standard frequency options are the output of the internal PLL. described in the following sections. The actual frequency output by the DSC2040 When Enable (pin 1) is floated or connected to is controlled by an internal pre-programmed VDD, the DSC2040 is in operational mode. memory (OTP). This memory stores all Driving Enable to ground will tri-state output coefficients required by the PLL for up to four driver (hi-impedance mode). Output Clock Frequencies Table 1 lists the standard frequency configurations and the associated ordering information to be used in conjunction with the ordering code. Customer defined combinations are available. Table 1. Pre-programmed pin-selectable output frequency combinations Freq Select Bits FS1, FS0 Default is 11 Ordering Freq Info (MHz) 00 01 10 11 D0001 f 125 156.25 200 100 OUT D000X f Contact factory for additional configurations. OUT Frequency select bit are weakly tied high so if left unconnected the default setting will be 11 and the device will output the associated frequency highlighted in Bold. DSC2040 Page 2 MK-Q-B-P-D-12042610-2