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DSC2011FM2-E0015T Datasheet(PDF) 3 Page - Micrel Semiconductor |
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DSC2011FM2-E0015T Datasheet(HTML) 3 Page - Micrel Semiconductor |
3 / 6 page Micrel, Inc. DSC2011FM2-E0015 Operational Description The DSC2011FM2-E0015 is a dual output LVCMOS oscillator consisting of a MEMS resonator and a supporting PLL IC. The two LVCMOS outputs are generated through independent 8-bit programmable dividers from the output of the internal PLL. The two constraints are imposed on the output frequencies: 1) f2 = M x f1/N, where M and N are even integers between 4 and 254, 2) 1.2GHz < N x f2 < 1.7GHz. The actual frequencies output by DSC2011FM2-E0015 are controlled by an internal pre-programmed memory (OTP). This memory stores all coefficients required by the PLL for up to eight different frequency combinations. Three control pins (FS0 - FS2) select the output frequency combination. DSC2011FM2-E0015 has independent control of the output voltage levels of the two outputs. The high voltage level of CLK1 is equal to the main supply voltage, VDD (pin 13). VDD2 (pin 12) sets the high voltage level of CLK2. VDD2 must be equal to or less than VDD at all times to insure proper operation. VDD2 can be as low as 1.65V. When OE (pin 1) is floated or connected to VDD, the DSC2011FM2-E0015 is in operational mode. Driving Enable to ground will tri-state both output drivers (hi-impedance mode). DSC2011FM2-E0015 has programmable output drive strength for each output. Using two control pins (OXS0- OXS1) for each output, the drive strength can be indepen- dently adjusted to match circuit board impedances to reduce spower supply noise, overshoot/undershoot and EMI. Table 1 displays typical rise / fall times for the output with a 15pF load capacitance as a function of these control pins at VDD = 3.3V and room temperature. Output Drive Strength Bits [OXS1, OXS0] - Default is [11] 00 01 10 11 tr (ns) 1.6 1.4 1.2 1.1 tf (ns) 2.4 2.2 1.5 1.4 Table 1. Rise/Fall Times for Drive Strengths Output Clock Frequencies Frequency select bits are weakly tied high so if left unconnected the default setting will be [111] and the device will output the associated frequency highlighted in bold. Freq (MHz) Freq Select Bits [FS2, FS1, FS0] - Default is [111] 000 001 010 011 100 101 110 111 CLK1 NA NA NA NA NA NA NA 20 CLK2 NA NA NA NA NA NA NA 20 Table 2. Pin-Selectable Output Frequencies Absolute Maximum Ratings Item Min. Max. Units Condition Supply Voltage -0.3 +4.0 V Input Voltage -0.3 VDD + 0.3 V Junction Temp - +150 °C Storage Temp -55 +150 °C Soldering Temp - +260 °C 40sec max. ESD HBM MM CDM - 4000 400 1500 V 1000+ years of data retention on internal memory May 10, 2016 3 Revision 1.0 tcghelp@micrel.com or (408) 955-1690 3892 |
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