Micrel DSC2010FL2 Low-jitter configurable cmos oscillator Datasheet

DSC2010
Low-Jitter Configurable CMOS Oscillator
General Description
The DSC2010 series of high performance
CMOS oscillators utilize a proven silicon
MEMS technology to provide excellent jitter
and stability while incorporating additional
device functionality. The DSC2010 allows
the user to easily modify the frequency and
drive strength of the oscillator using pins.
The DSC2010 has provision for up to four
user-defined pre-programmed, pin-selectable
output frequencies, and eight pin-selectable
output drive levels to help reduce EMI.
DSC2010 is packaged in a 14-pin 3.2x2.5
mm
QFN
package
and
available
in
temperature grades from Ext. Commercial to
Automotive.
Features
 Low RMS Phase Jitter: <1 ps (typ)
 High Stability: ±10, ±25, ±50 ppm
 Wide Temperature Range
o Automotive: -55° to 125° C
o Ext. Industrial: -40° to 105° C
o Industrial: -40° to 85° C
o Ext. commercial: -20° to 70° C
 High Supply Noise Rejection: -50 dBc
 Pin-Selectable Configurations
o 3-bit Output Drive Strength
o 2-bit Output Frequency Combinations
 Short Lead Times: 2 Weeks
 Wide Freq. Range:
o CMOS Output: 2.3 to 170 MHz
 Miniature Footprint of 3.2x2.5mm
Block Diagram
 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
 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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DSC2010
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MK-Q-B-P-D-12042601-2
DSC2010
Low-Jitter Configurable CMOS 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
OS0
OS1
NC
VDD2
VDD
OS2
Pin Type
I
NA
NA
Power
I
I
NA
O
I
I
NA
Power
Power
I
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
CMOS output
Least significant bit for output drive strength selection
Middle bit for output drive strength selection
Leave unconnected or grounded
Power Supply
Power Supply
Most significant bit for output drive strength selection
Operational Description
The DSC2010 is a CMOS oscillator consisting
of a MEMS resonator and a support PLL IC.
The CMOS output is generated through
independent 8-bit programmable dividers from
the output of the internal PLL.
The actual frequency output by the DSC2010
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
DSC2010. Standard frequency options are
described in the following sections.
When Enable (pin 1) is floated or connected to
VDD, the DSC2010 is in operational mode.
Driving Enable to ground will disable the
output driver (hi-impedance mode).
The DSC2010 has programmable output drive
strength. Using three control pins (OS0-OS2)
the drive strength can be adjusted to match
circuit board impedances to reduce power
supply noise, overshoot/undershoot and EMI.
Table 1 displays typical rise / fall times for the
output with a 15pf load capacitance as a
function of these control pins at VDD=3.3V
and room temperature.
Table 1. Rise/Fall times for drive strengths
Output Drive Strength Bits
[OS2, OS1, OS0] - Default [111]
000
001
010
011
100
101
110
111
tr
(ns)
2.1
1.7
1.6
1.4
1.3
1.3
1.2
1.1
tf
(ns)
2.5
2.4
2.4
2.2
1.8
1.6
1.4
1.4
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DSC2010
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MK-Q-B-P-D-12042601-2
DSC2010
Low-Jitter Configurable CMOS Oscillator
Output Clock Frequencies
Table 2 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 2. Pre-programmed pin-selectable output frequency combinations
Freq Select Bits [FS1, FS0] – Default is [11]
Ordering
Info
Freq
(MHz)
00
01
10
11
A0001
fOUT
27
24
148.5
74.25
A0002
fOUT
155.52
106.25
156.25
125
A0003
fOUT
25
75
125
150
A0004
fOUT
72
74.25
36
108
A0005
fOUT
27
50
0*
0*
A0006
fOUT
16
13.56
0*
0*
A0007
fOUT
96
55
0*
0*
A0008
fOUT
25
50
0*
0*
A0009
fOUT
55.296
27.648
0*
0*
A00010
fOUT
27.648
55.296
0*
0*
A000X
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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DSC2010
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MK-Q-B-P-D-12042601-2
DSC2010
Low-Jitter Configurable CMOS 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
40sec max.
Temp Range
E: -20 to 70
I: -40 to 85
L: -40 to 105
M: -55 to 125
DSC2010
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, max CMOS drive strength)
Parameter
Supply Voltage
1
Condition
VDD
Supply Current
IDD
Frequency Stability
Δf
Aging
Startup Time2
Input Logic Levels
Input logic high
Input logic low
Δf
tSU
VIH
VIL
Output Disable Time3
Output Enable Time
Min.
Typ.
2.25
EN pin low – output is disabled
Includes frequency variations due
to initial tolerance, temp. and
power supply voltage
1 year @25°C
T=25°C
21
Unit
3.6
V
23
±10
±25
±50
±5
5
mA
ppm
ppm
ms
0.25xVDD
V
tDA
5
ns
tEN
20
ns
4
0.75xVDD
-
Max.
Pull-Up Resistor
Pull-up exists on all digital IO
Supply Current4
EN pin high – output is enabled
CL=15pF, FO=125 MHz
40
kΩ
CMOS Output
Output Logic Levels
Output logic high
Output logic low
Output Transition time3
Rise Time
Fall Time
Frequency
IDD
VOH
VOL
tR
tF
f0
I=±6mA
31
0.9xVDD
-
20% to 80%
CL=15pf
Commercial/Industrial temp range
Automotive temp range
1.1
1.3
2.3
Output Duty Cycle
SYM
Period Jitter
JPER
FO=125 MHz
3
JCC
200kHz to 20MHz @ 125MHz
100kHz to 20MHz @ 125MHz
12kHz to 20MHz @ 125MHz
0.3
0.38
1.7
Integrated Phase Noise
Notes:
1.
2.
3.
4.
45
35
mA
0.1xVDD
V
2
2
170
100
ns
55
MHz
%
psRMS
2
psRMS
Pin 4 VDD should be filtered with 0.01uf capacitor.
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.
Output is enabled if Enable pad is floated or not connected.
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DSC2010
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MK-Q-B-P-D-12042601-2
DSC2010
Low-Jitter Configurable CMOS Oscillator
Nominal Performance Parameters (Unless specified otherwise: T=25° C, VDD=3.3 V)
2.5
Phase Jitter (ps RMS)
25MHz-CMOS
50MHz-CMOS
2.0
106MHz-CMOS
1.5
125MHz-CMOS
1.0
0.5
0.0
0
200
400
600
800
1000
Low-end of integration BW: x kHz to 20 MHz
CMOS Phase jitter (integrated phase noise)
Output Waveform: CMOS
tR
tF
VOH
Output
VOL
tEN
1/fo
tDA
VIH
Enable
VIL
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DSC2010
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MK-Q-B-P-D-12042601-2
DSC2010
Low-Jitter Configurable CMOS 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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DSC2010
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MK-Q-B-P-D-12042601-2
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