DSC2020FI1-T [MICREL]
Low-Jitter Configurable LVPECL Oscillator;
| 型号： | DSC2020FI1-T |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | Low-Jitter Configurable LVPECL Oscillator |
| 文件： | 总5页 (文件大小：629K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DSC2020
Low-Jitter Configurable LVPECL Oscillator
General Description
Features
The DSC2020 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
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
4 Pin-Selectable Output Frequencies
Short Lead Times: 2 Weeks
frequency source.
provision for up to eight user-defined pre-
programmed, pin-selectable output
frequency combinations.
The DSC2020 has
Wide Freq. Range:
o LVPECL Output: 2.3 to 460 MHz
Miniature Footprint of 3.2x2.5mm
DSC2020 is packaged in a 14-pin 3.2x2.5
mm QFN package and available in
temperature grades from Ext. Commercial to
Excellent Shock & Vibration Immunity
o Qualified to MIL-STD-883
Industrial.
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
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DSC2020 Page 1 MK-Q-B-P-D-12042603-2
Low-Jitter Configurable LVPECL Oscillator
DSC2020
Pin Description
Pin No.
Pin Name Pin Type
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 LVPECL Output
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Enable
NC
NC
GND
FS0
I
NA
NA
Power
I
FS1
I
NC
NA
O
O
NA
NA
Power
Power
NA
Output+
Output-
NC
Negative LVPECL Output
Leave unconnected or grounded
Leave unconnected or grounded
Power Supply
Power Supply
Leave unconnected or grounded
NC
VDD2
VDD
NC
Operational Description
The DSC2020 is a LVPECL oscillator consisting
of a MEMS resonator and a support PLL IC.
The LVPECL 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
DSC2020. Standard frequency options are
described in the following sections.
The actual frequency output by the DSC2020
is controlled by an internal pre-programmed
When Enable (pin 1) is floated or connected to
VDD, the DSC2020 is in operational mode.
Driving Enable to ground will tri-state output
driver (hi-impedance mode).
memory (OTP).
This memory stores all
coefficients required by the PLL for up to four
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
B0001
B000X
fOUT
fOUT
125
212.5
106.25
156.25
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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DSC2020
Page 2
MK-Q-B-P-D-12042603-02
Low-Jitter Configurable LVPECL Oscillator
DSC2020
Absolute Maximum Ratings
Ordering Code
Item
Min
Max
Unit Condition
Temp Range
E: -20 to 70
I: -40 to 85
Packing
T: Tape & Reel
: Tube
Supply Voltage
-0.3
+4.0
V
Input Voltage
Junction Temp
Storage Temp
Soldering Temp
-0.3 VDD+0.3
V
-
-55
-
+150
+150
+260
°C
°C
°C
V
DSC2020
F
2
xxxxx
I
T
40sec max.
Package
Stability
1: ±50ppm
2: ±25ppm
5: ±10ppm
Freq (MHz)
See Freq. table
ESD
HBM
MM
-
F: 3.2x2.5mm
4000
400
CDM
1500
Note: 1000+ years of data retention on internal memory
Specifications (Unless specified otherwise: T=25° C)
Parameter
Supply Voltage1
Condition
Min.
Typ.
Max.
Unit
V
VDD
IDD
2.25
3.6
23
Supply Current
Supply Current2
EN pin low – outputs are disabled
21
mA
EN pin high – outputs are enabled
RL=50Ω, FO= 156.25 MHz
IDD
56.5
58
mA
Includes frequency variations due
to initial tolerance, temp. and
power supply voltage
±10
±25
±50
±5
5
Frequency Stability
Aging
Startup Time3
Δf
ppm
Δf
tSU
1 year @25°C
T=25°C
ppm
ms
Input Logic Levels
Input logic high
Input logic low
VIH
VIL
0.75xVDD
-
-
V
0.25xVDD
Output Disable Time4
Output Enable Time
Pull-Up Resistor2
tDA
5
ns
ns
tEN
20
Pull-up exists on all digital IO
40
kΩ
LVPECL Outputs
Output Logic Levels
Output logic high
Output logic low
VOH
VOL
RL=50Ω
VDD-1.08
-
-
V
VDD-1.55
Pk to Pk Output Swing
Output Transition time4
Rise Time
Single-Ended
800
250
mV
ps
20% to 80%
tR
tF
RL=50Ω
Fall Time
Frequency
f0
Single Frequency
Differential
2.3
48
460
52
MHz
%
Output Duty Cycle
Period Jitter5
SYM
JPER
FO=156.25 MHz
2.5
0.25
0.38
1.7
psRMS
200kHz to 20MHz @156.25MHz
100kHz to 20MHz @156.25MHz
12kHz to 20MHz @156.25MHz
Integrated Phase Noise
JPH
psRMS
2
Notes:
1.
Pin 4 VDD should be filtered with 0.01uf capacitor.
2.
3.
4.
5.
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.
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DSC2020 Page 3 MK-Q-B-P-D-12042603-02
Low-Jitter Configurable LVPECL Oscillator
DSC2020
Nominal Performance Parameters (Unless specified otherwise: T=25° C, VDD=3.3 V)
LVPECL
LVPECL
LVPECL
LVPECL Phase jitter (integrated phase noise)
Output Waveform: LVPECL
tR
tF
Output
Output
80%
50%
20%
830 mv
tEN
1/fo
tDA
VIH
Enable
VIL
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DSC2020 Page 4 MK-Q-B-P-D-12042603-02
Low-Jitter Configurable LVPECL Oscillator
DSC2020
Solder Reflow Profile
20-40
Sec
260°C
MSL 1 @ 260°C refer to JSTD-020C
Ramp-Up Rate (200°C to Peak Temp) 3°C/Sec Max.
217°C
200°C
60-150
Sec
Preheat Time 150°C to 200°C
Time maintained above 217°C
Peak Temperature
Time within 5°C of actual Peak
Ramp-Down Rate
60-180 Sec
60-150 Sec
255-260°C
20-40 Sec
6°C/Sec Max.
8 min Max.
Reflow
60-180
Sec
150°C
Cool
Pre heat
25°C
Time 25°C to Peak Temperature
Time
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
●
●
USA
●
Email: hbwhelp@micrel.com
www.micrel.com
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DSC2020 Page 5 MK-Q-B-P-D-12042603-02
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