DSC2040 Low-Jitter Configurable HCSL Oscillator General Description The DSC2040 series of high performance dual output oscillators utilize a proven silicon MEMS technology to provide excellent jitter and stability while incorporating additional device functionality. The two outputs are controlled by separate supply voltages to allow for high output isolation. The frequencies of the outputs can be identical or independently derived from a common PLL frequency source. The DSC2040 has provision for up to eight user-defined preprogrammed, pin-selectable output frequency combinations. DSC2040 is packaged in a 14-pin 3.2x2.5 mm QFN package and available in temperature grades from Ext. Commercial to Industrial. Features Low RMS Phase Jitter: <1 ps (typ) High Stability: ±10, ±25, ±50 ppm Wide Temperature Range o Industrial: -40° to 85° C o Ext. commercial: -20° to 70° C High Supply Noise Rejection: -50 dBc Two Independent HCSL Outputs 4 Pin-Selectable Output Frequencies Short Lead Times: 2 Weeks Wide Freq. Range: o HCSL Output: 2.3 to 460 MHz Miniature Footprint of 3.2x2.5mm 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 _____________________________________________________________________________________________________________________________ _________________ DSC2040 Page 1 MK-Q-B-P-D-12042610-2 DSC2040 Low-Jitter Configurable HCSL Oscillator Pin Description Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name Enable NC NC GND FS0 FS1 NC Output+ OutputNC NC VDD2 VDD NC Pin Type I NA NA Power I I NA O O NA NA Power Power NA Description Enables outputs when high and disables when low Leave unconnected or grounded Leave unconnected or grounded Ground Least significant bit for frequency selection Most significant bit for frequency selection Leave unconnected or grounded Positive HCSL Output Negative HCSL Output Leave unconnected or grounded Leave unconnected or grounded Power Supply Power Supply Leave unconnected or grounded Operational Description The DSC2040 is a HCSL oscillator consisting of a MEMS resonator and a support PLL IC. The HCSL output is generated through independent 8-bit programmable dividers from the output of the internal PLL. different frequencies. Two control pins (FS0 – FS1) select the output frequency. Discera supports customer defined versions of the DSC2040. Standard frequency options are described in the following sections. The actual frequency output by the DSC2040 is controlled by an internal pre-programmed memory (OTP). This memory stores all coefficients required by the PLL for up to four When Enable (pin 1) is floated or connected to VDD, the DSC2040 is in operational mode. Driving Enable to ground will tri-state output 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 Info Freq (MHz) 00 01 10 11 D0001 fOUT 125 156.25 200 100 D000X fOUT Contact factory for additional configurations. 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 DSC2040 Low-Jitter Configurable HCSL Oscillator Ordering Code Absolute Maximum Ratings Item Min Max Unit Supply Voltage -0.3 +4.0 V Input Voltage Junction Temp Storage Temp Soldering Temp -0.3 -55 - VDD+0.3 +150 +150 +260 V °C °C °C ESD HBM MM CDM - Condition Temp Range E: -20 to 70 I: -40 to 85 40sec max. DSC2040 V F I 2 Package F: 3.2x2.5mm 4000 400 1500 - xxxxx Stability 1: ±50ppm 2: ±25ppm 5: ±10ppm Packing T: Tape & Reel : Tube T Freq (MHz) See Freq. table Note: 1000+ years of data retention on internal memory Specifications (Unless specified otherwise: T=25° C) Parameter Supply Voltage 1 Condition VDD Min. Typ. 2.25 Max. Unit 3.6 V Supply Current IDD EN pin low – outputs are disabled 21 23 mA Supply Current2 IDD EN pin high – outputs are enabled RL=50 Ω, FO=156.25 MHz 40 42 mA Frequency Stability Δf Includes frequency variations due to initial tolerance, temp. and power supply voltage ±10 ±25 ±50 ppm Aging Startup Time3 Input Logic Levels Input logic high Input logic low Δf tSU 1 year @25°C T=25°C ±5 5 ppm ms VIH VIL 0.25xVDD V Output Disable Time4 tDA 5 ns Output Enable Time tEN 20 ns 2 Pull-Up Resistor 0.75xVDD - Pull-up exists on all digital IO 40 kΩ HCSL Outputs Output Logic Levels Output logic high Output logic low VOH VOL Pk to Pk Output Swing RL=50Ω 0.725 - Single-Ended Output Transition time4 Rise Time Fall Time tR tF Frequency 0.1 750 V mV 20% to 80% RL=50Ω, CL= 2pF 200 400 ps f0 Single Frequency 2.3 460 MHz SYM Differential 48 52 % Period Jitter JPER FO=156.25 MHz 2.8 Integrated Phase Noise JPH 200kHz to 20MHz @156.25MHz 100kHz to 20MHz @156.25MHz 12kHz to 20MHz @156.25MHz 0.25 0.37 1.7 Output Duty Cycle 5 Notes: 1. 2. 3. 4. 5. psRMS 2 psRMS Pin 4 VDD should be filtered with 0.01uf capacitor. Output is enabled if Enable pad is floated or not connected. tsu is time to 100PPM stable output frequency after VDD is applied and outputs are enabled. Output Waveform and Test Circuit figures below define the parameters. Period Jitter includes crosstalk from adjacent output. _____________________________________________________________________________________________________________________________ _________________ DSC2040 Page 3 MK-Q-B-P-D-12042610-2 DSC2040 Low-Jitter Configurable HCSL Oscillator Nominal Performance Parameters (Unless specified otherwise: T=25° C, VDD=3.3 V) 2.5 Phase Jitter (ps RMS) 50MHz-HCSL 106MHz-HCSL 2.0 156MHz-HCSL 1.5 212MHz-HCSL 1.0 0.5 0.0 0 200 400 600 800 1000 Low-end of integration BW: x kHz to 20 MHz HCSL Phase jitter (integrated phase noise) Output Waveform: HCSL tR Output tF 80% 675mv mV 830 50% Output 20% tEN 1/f o tDA VIH Enable VIL _____________________________________________________________________________________________________________________________ _________________ DSC2040 Page 4 MK-Q-B-P-D-12042610-2 DSC2040 Low-Jitter Configurable HCSL Oscillator Solder Reflow Profile 20-40 Sec Se 3C / 217°C 200°C 60-150 Sec . ax cM Se 3C / 25°C a x. Reflow 60-180 Sec cM 150°C Se 6C/ Temperature (°C) cM ax . 260°C Cool Pre heat Time 8 min max MSL 1 @ 260°C refer to JSTD-020C Ramp-Up Rate (200°C to Peak Temp) 3°C/Sec Max. Preheat Time 150°C to 200°C 60-180 Sec Time maintained above 217°C 60-150 Sec 255-260°C Peak Temperature Time within 5°C of actual Peak 20-40 Sec 6°C/Sec Max. Ramp-Down Rate Time 25°C to Peak Temperature 8 min Max. Package Dimensions 3.2 x 2.5 mm 14 Lead Plastic Package Disclaimer: Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. MICREL, Inc. Phone: +1 (408) 944-0800 ● ● 2180 Fortune Drive, Fax: +1 (408) 474-1000 San Jose, California 95131 ● Email: [email protected] ● ● USA www.micrel.com _____________________________________________________________________________________________________________________________ _________________ DSC2040 Page 5 MK-Q-B-P-D-12042610-2