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DSC2040FE5 Datasheet(PDF) 2 Page - Micrel Semiconductor |
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DSC2040FE5 Datasheet(HTML) 2 Page - Micrel Semiconductor |
2 / 5 page ______________________________________________________________________________________________________________________________________________ DSC2040 Page 2 MK-Q-B-P-D-12042610-2 DSC2040 Low-Jitter Configurable HCSL Oscillator 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 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. 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 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. 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 Ordering Info Freq (MHz) Freq Select Bits [FS1, FS0] – Default is [11] 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. |
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