Micrel DSC2030FE2 Low-jitter configurable lvds oscillator Datasheet

DSC2030
Low-Jitter Configurable LVDS Oscillator
General Description
Features
The DSC2030 series of high performance
LVDS oscillators utilize a proven silicon MEMS
technology to provide excellent jitter and
stability while incorporating additional device
functionality. The DSC2030 allows the user
to easily modify the frequency of the
oscillator using pins.
The DSC2030 has
provision for up to four user-defined preprogrammed,
pin-selectable
output
frequencies.
 Low RMS Phase Jitter: <1 ps (typ)
DSC2030 is packaged in a 14-pin 3.2x2.5
mm
QFN
package
and
available
in
temperature grades from Ext. Commercial to
Automotive.
 Wide Freq. Range:
o LVDS Output: 2.3 to 460 MHz
 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
 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
 Consumer Electronics
 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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DSC2030
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MK-Q-B-P-D-12042606-2
DSC2030
Low-Jitter Configurable LVDS Oscillator
Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Name
Enable
NC
NC
GND
FS0
FS1
NC
Output+
OutputNC
NC
VDD2
VDD
NC
Pin Type
I
NA
NA
Power
I
I
NA
O
O
NA
NA
Power
Power
NA
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 LVDS Output
Negative LVDS Output
Leave unconnected or grounded
Leave unconnected or grounded
Power Supply
Power Supply
Leave unconnected or grounded
Operational Description
The DSC2030 is a LVDS oscillator consisting of
a MEMS resonator and a support PLL IC. The
LVDS
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
DSC2030. Standard frequency options are
described in the following sections.
The actual frequency output by the DSC2030
is controlled by an internal pre-programmed
memory (OTP).
This memory stores all
coefficients required by the PLL for up to four
When Enable (pin 1) is floated or connected to
VDD, the DSC2030 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
Freq Select Bits [FS1, FS0] – Default is [11]
Ordering
Info
Freq
(MHz)
00
01
10
11
C0001
fOUT
148.35165
74.17582
148.5
74.25
C0002
fOUT
100
0*
0*
100
C0003
fOUT
100
150
156.25
312.5
C0004
fOUT
148.5
148.35
0*
0*
C0005
fOUT
315
0*
0*
315
C000X
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.
0* – denotes invalid selection, output frequency is not specified.
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DSC2030
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MK-Q-B-P-D-12042606-2
DSC2030
Low-Jitter Configurable LVDS Oscillator
Absolute Maximum Ratings
Item
Min
Max
Unit
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
ESD
HBM
MM
CDM
-
Ordering Code
Condition
Temp Range
E: -20 to 70
I: -40 to 85
40sec max.
DSC2030
V
F I 2
Package
F: 3.2x2.5mm
4000
400
1500
-
xxxxx
Stability
1: ±50ppm
2: ±25ppm
5: ±10ppm
Packing
T: Tape & Reel
: Tube
T
Freq (MHz)
See Freq. table
Note: 1000+ years of data retention on internal memory
Specifications
(Unless specified otherwise: T=25° C)
Parameter
Supply Voltage
1
Condition
VDD
Supply Current
IDD
Supply Current2
IDD
Frequency Stability
Δf
Aging
Startup Time3
Δf
tSU
Input Logic Levels
Input logic high
Input logic low
VIH
VIL
Output Disable Time4
Output Enable Time
Min.
Typ.
2.25
EN pin low – output is disabled
EN pin high – outputs are enabled
RL=100Ω, FO= 156.25 MHz
Includes frequency variations due
to initial tolerance, temp. and
power supply voltage
1 year @25°C
T=25°C
Max.
Unit
3.6
V
21
23
mA
29
32
mA
±10
±25
±50
±5
5
ppm
ms
0.25xVDD
V
tDA
5
ns
tEN
20
ns
2
Pull-Up Resistor
0.75xVDD
-
ppm
Pull-up exists on all digital IO
40
kΩ
LVDS Output
Output Offset Voltage
R=100Ω Differential
1.125
Delta Offset Voltage
Pk to Pk Output Swing
Single-Ended
350
20% to 80%
RL=100Ω, CL= 2pF
200
Output Transition time4
Rise Time
Fall Time
tR
tF
Frequency
f0
Single Frequency
SYM
Differential
Output Duty Cycle
5
Period Jitter
Integrated Phase Noise
Notes:
1.
2.
3.
4.
5.
1.4
V
50
mV
mV
350
ps
2.3
460
MHz
48
52
%
JPER
FO=156.25 MHz
2.5
JCC
200kHz to 20MHz @156.25MHz
100kHz to 20MHz @156.25MHz
12kHz to 20MHz @156.25MHz
0.28
0.4
1.7
psRMS
2
psRMS
Pin 4 VDD should be filtered with 0.01uf capacitor.
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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DSC2030
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MK-Q-B-P-D-12042606-2
DSC2030
Low-Jitter Configurable LVDS Oscillator
Nominal Performance Parameters (Unless specified otherwise: T=25° C, VDD=3.3 V)
2.5
Phase Jitter (ps RMS)
156MHz-LVDS
212MHz-LVDS
2.0
320MHz-LVDS
1.5
410MHz-LVDS
1.0
0.5
0.0
0
200
400
600
800
1000
Low-end of integration BW: x kHz to 20 MHz
LVDS Phase jitter (integrated phase noise)
Output Waveform: LVDS
tR
Output
tF
80%
350
mV
830 mv
50%
Output
20%
tEN
1/f o
tDA
VIH
Enable
VIL
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DSC2030
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MK-Q-B-P-D-12042606-2
DSC2030
Low-Jitter Configurable LVDS Oscillator
Solder Reflow Profile
20-40
Sec
Se
3C
/
217°C
200°C
60-150
Sec
.
ax
cM
Se
3C
/
25°C
a x.
Reflow
60-180
Sec
cM
150°C
Se
6C/
Temperature (°C)
cM
ax
.
260°C
Cool
Pre heat
Time
8 min max
MSL 1 @ 260°C refer to JSTD-020C
Ramp-Up Rate (200°C to Peak Temp) 3°C/Sec Max.
Preheat Time 150°C to 200°C
60-180 Sec
Time maintained above 217°C
60-150 Sec
255-260°C
Peak Temperature
Time within 5°C of actual Peak
20-40 Sec
6°C/Sec Max.
Ramp-Down Rate
Time 25°C to Peak Temperature
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
● Email: [email protected]
●
●
USA
www.micrel.com
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DSC2030
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MK-Q-B-P-D-12042606-2
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