DSC2044FE2 [MICREL]
Low-Jitter Configurable Dual HCSL Oscillator;
| 型号： | DSC2044FE2 |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | Low-Jitter Configurable Dual HCSL Oscillator |
| 文件： | 总6页 (文件大小：529K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DSC2044
Low-Jitter Configurable Dual HCSL Oscillator
General Description
Features
The DSC2044 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
Two Independent HCSL Outputs
frequency source.
provision for up to eight user-defined pre-
programmed, pin-selectable output
frequency combinations.
The DSC2044 has
Pin-Selectable Configurations
o 3-bit Output Frequency Combinations
Short Lead Times: 2 Weeks
Wide Freq. Range:
o HCSL Output: 2.3 – 460 MHz
DSC2044 is packaged in a 14-pin 3.2x2.5
mm QFN package and available in
temperature grades from Ext. Commercial to
Industrial.
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
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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DSC2044 Page 1 MK-Q-B-P-D-12042614-2
Low-Jitter Configurable Dual HCSL Oscillator
DSC2044
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
1
2
3
Enable
NC
I
NA
NC
NA
4
GND
Power
5
6
7
8
FS0
FS1
FS2
I
I
I
O
O
Least significant bit for frequency selection
Middle bit for frequency selection
Most significant bit for frequency selection
Positive HCSL Output 1
Negative HCSL Output 1
Negative HCSL Output 2
Positive HCSL Output 2
Power Supply for HCSL Output 2
Power Supply
Output1+
Output1-
Output 2-
Output 2+
VDD2
VDD
9
10
11
12
13
14
O
O
Power
Power
NA
NC
Leave unconnected or grounded
Operational Description
The DSC2044 is a dual output HCSL oscillator
consisting of a MEMS resonator and a support
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 DSC2044.
Standard frequency options are described in in
the following sections.
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.
When Enable (pin 1) is floated or connected to
VDD, the DSC2044 is in operational mode.
Driving Enable to ground will tri-state both
The actual frequencies output by the DSC2044
are controlled by an internal pre-programmed
output
drivers
(hi-impedance
mode).
memory (OTP).
This memory stores all
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DSC2044 Page 2 MK-Q-B-P-D-12042614-2
Low-Jitter Configurable Dual HCSL Oscillator
DSC2044
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 [FS2, FS1, FS0] – Default is [111]
Ordering
Info
Freq
(MHz)
000
106.25
25
001
100
010
125
50
011
100
50
100
156.25
25
101
156.25
125
50
110
125
25
111
156.25
156.25
200
fOUT1
fOUT2
fOUT1
fOUT2
fOUT1
fOUT2
fOUT1
fOUT2
fOUT1
fOUT2
H0001
H0002
H0003
H0004
HXXXX
100
100
156.25
156.25
100
100
50
125
125
0*
125
50
200
50
100
50
10
125
125
125
125
125
0*
0*
0*
156.25
156.25
125
156.25
75
100
0*
0*
0*
0*
100
150
150
75
100
150
75
75
100
125
100
150
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.
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DSC2044
Page 3
MK-Q-B-P-D-12042614-2
Low-Jitter Configurable Dual HCSL Oscillator
DSC2044
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
DSC2044 F I 2
xxxxx
T
40sec max.
ESD
HBM
MM
-
Package
Stability
1: ±50ppm
2: ±25ppm
5: ±10ppm
Freq (MHz)
See Freq. table
4000
400
1500
F: 3.2x2.5mm
CDM
Note: 1000+ years of data retention on internal memory
Specifications (Unless specified otherwise: T=25° C)
Parameter
Supply Voltage1
Condition
Min.
Typ.
Max.
3.6
Unit
VDD
IDD
2.25
V
Supply Current
Supply Current2
EN pin low – outputs are disabled
21
60
23
mA
EN pin high – outputs are enabled
RL=50 Ω, FO1=FO2=156.25 MHz
IDD
mA
Includes frequency variations due
to initial tolerance, temp. and
power supply voltage
±10
±25
±50
Frequency Stability
Aging
Startup Time3
Δf
ppm
Δf
tSU
1 year @25°C
T=25°C
±5
5
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
HCSL Outputs
Output Logic Levels
Output logic high
Output logic low
VOH
VOL
RL=50Ω
0.725
-
-
0.1
V
Pk to Pk Output Swing
Output Transition time4
Rise Time
Single-Ended
750
mV
ps
20% to 80%
RL=50Ω, CL= 2pF
tR
tF
200
400
Fall Time
Frequency
f0
Single Frequency
Differential
2.3
48
460
52
MHz
%
Output Duty Cycle
Period Jitter5
SYM
JPER
FO1=FO2=156.25 MHz
2.8
psRMS
200kHz to 20MHz @156.25MHz
100kHz to 20MHz @156.25MHz
12kHz to 20MHz @156.25MHz
0.25
0.37
1.7
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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DSC2044 Page 4 MK-Q-B-P-D-12042614-2
Low-Jitter Configurable Dual HCSL Oscillator
DSC2044
Nominal Performance Parameters (Unless specified otherwise: T=25° C, VDD=3.3 V)
2.5
50MHz-HCSL
106MHz-HCSL
156MHz-HCSL
212MHz-HCSL
2.0
1.5
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
tF
Output
Output
80%
50%
20%
675 mV
tEN
1/fo
tDA
VIH
Enable
VIL
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DSC2044 Page 5 MK-Q-B-P-D-12042614-2
Low-Jitter Configurable Dual HCSL Oscillator
DSC2044
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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DSC2044 Page 6 MK-Q-B-P-D-12042614-2
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