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LVPECL Oscillator. DSC2022 Datasheet

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LVPECL Oscillator. DSC2022 Datasheet
















DSC2022 Oscillator. Datasheet pdf. Equivalent













Part

DSC2022

Description

Low-Jitter Configurable Dual LVPECL Oscillator



Feature


DSC2022 Low-Jitter Configurable Dual LV PECL Oscillator General Description T he DSC2022 series of high performance dual output oscillators utilize a prove n silicon MEMS technology to provide e xcellent jitter and stability while in corporating additional device function ality. The two outputs are controlled by separate supply voltages to allow f or high output iso.
Manufacture

Micrel

Datasheet
Download DSC2022 Datasheet


Micrel DSC2022

DSC2022; lation. The frequencies of the outputs can be identical or independently deri ved from a common PLL frequency source . The DSC2022 has provision for up to eight user-defined pre- programmed, p in-selectable output frequency combin ations. DSC2022 is packaged in a 14-pi n 3.2x2.5 mm QFN package and available in temperature grades from Ext. Commerc ial to Industrial..


Micrel DSC2022

Block Diagram Features Low RMS Phase Jitter: <1 ps (typ) High Stability: 10, ±25, ±50 ppm Wide Temperature R ange o Industrial: -40° to 85° C o Ex t. commercial: -20° to 70° C High Su pply Noise Rejection: -50 dBc Two Inde pendent LV .


Micrel DSC2022

.





Part

DSC2022

Description

Low-Jitter Configurable Dual LVPECL Oscillator



Feature


DSC2022 Low-Jitter Configurable Dual LV PECL Oscillator General Description T he DSC2022 series of high performance dual output oscillators utilize a prove n silicon MEMS technology to provide e xcellent jitter and stability while in corporating additional device function ality. The two outputs are controlled by separate supply voltages to allow f or high output iso.
Manufacture

Micrel

Datasheet
Download DSC2022 Datasheet




 DSC2022
DSC2022
Low-Jitter Configurable Dual LVPECL Oscillator
General Description
The DSC2022 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 DSC2022 has
provision for up to eight user-defined pre-
programmed,
pin-selectable
output
frequency combinations.
DSC2022 is packaged in a 14-pin 3.2x2.5
mm QFN package and available in
temperature grades from Ext. Commercial to
Industrial.
Block Diagram
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 LVPECL Outputs
Pin-Selectable Configurations
o 3-bit Output Frequency Combinations
Short Lead Times: 2 Weeks
Wide Freq. Range:
o LVPECL Output: 2.3 460 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
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
_____________________________________________________________________________________________________________________________ _________________
DSC2022
Page 1
MK-Q-B-P-D-12042605-3




 DSC2022
DSC2022
Low-Jitter Configurable Dual LVPECL 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 Middle bit for frequency selection
7 FS2
I Most significant bit for frequency selection
8 Output1+ O Positive LVPECL Output 1
9 Output1- O Negative LVPECL Output 1
10 Output 2-
O Negative LVPECL Output 2
11 Output 2+ O Positive LVPECL Output 2
12
VDD2
Power Power Supply 2 for LVPECL Output 2
13
VDD
Power Power Supply
14 NC NA Leave unconnected or grounded
Operational Description
The DSC2022 is a dual output LVPECL
oscillator consisting of a MEMS resonator and
a support PLL IC. The two outputs are
generated through independent 8-bit
programmable dividers from the output of the
internal PLL. 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 the DSC2022
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. Discera supports
customer defined versions of the DSC2022.
Standard frequency options are described in in
the following sections.
When Enable (pin 1) is floated or connected to
VDD, the DSC2022 is in operational mode.
Driving Enable to ground will tri-state both
output drivers (hi-impedance mode).
_____________________________________________________________________________________________________________________________ _________________
DSC2022
Page 2
MK-Q-B-P-D-12042605-3




 DSC2022
DSC2022
Low-Jitter Configurable Dual LVPECL Oscillator
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 [FS2, FS1, FS0] Default is [111]
000 001 010 011 100 101 110 111
F0001
fOUT1
fOUT2
106.25
25
100
100
125 156.25 156.25 156.25 125
125 156.25 25 125 25
400
200
F0002
fOUT1
fOUT2
156.25
25
0*
0*
0*
0*
0* 156.25 0*
0* 25 0*
0* 156.25
0* 25
F0003
fOUT1
fOUT2
150
150
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
F0004
fOUT1
fOUT2
100
150
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
FXXXXX
fOUT1
fOUT2
Contact factory for additional configurations.
Frequency select bit 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.
0* denotes invalid selection, output frequency is not specified.
_____________________________________________________________________________________________________________________________ _________________
DSC2022
Page 3
MK-Q-B-P-D-12042605-3




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