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DSC8102 | DSC8122 Page 1 MK-Q-B-P-D-030411-02-2
Programmable Low-Jitter Precision LVPECL Oscillator
DSC8102
DSC8122
General Description
The DSC8102 & DSC8122 series of high
performance field-programmable oscillators
utilizes a proven silicon MEMS technology to
provide excellent jitter and stability over a
wide range of supply voltages and
temperatures. Using the TIMEFLASH
programmer, the end user can easily
program the oscillators’ frequency in the field
for immediate testing or use in advance
prototype development or production.
DSC8102 has a standby feature allowing it to
completely power-down when EN pin is
pulled low; whereas for DSC8122, only the
outputs are disabled when EN is low. Both
oscillators are available in industry standard
packages, including the small 3.2x2.5 mm2,
and are “drop-in” replacement for standard
6-pin LVPECL quartz oscillators.
Block Diagram
Output Enable Modes
EN Pin
DSC8102
DSC8122
High
Outputs Active
Outputs Active
NC
Outputs Active
Outputs Active
Low
Standby
Outputs Disabled
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
Short Lead Time: 2 Weeks
Wide Freq. Range: 10 to 460 MHz
Small Industry Standard Footprints
o 2.5x2.0, 3.2x2.5, 5.0x3.2, & 7.0x5.0 mm
Excellent Shock & Vibration Immunity
o Qualified to MIL-STD-883
High Reliability
o 20x better MTF than quartz oscillators
Low Current Consumption
Supply Range of 2.25 to 3.6 V
Standby & Output Enable Function
Lead Free & RoHS Compliant
LVDS & HCSL Versions Available
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: Gen 1 & Gen 2
DisplayPort
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DSC8102 | DSC8122 Page 2 MK-Q-B-P-D-030411-02-2
DSC8102
Programmable Low-Jitter Precision LVPECL Oscillator
DSC8122
Absolute Maximum Ratings
Item
Min
Max
Unit
Condition
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
40sec max.
ESD
HBM
MM
CDM
-
4000
400
1500
V
Ordering Code
Note: 1000+ years of data retention on internal memory
Specifications
Notes:
1. Pin 6 VDD should be filtered with 0.1uf capacitor.
2. tsu is time to 100ppm of output frequency after VDD is applied and outputs are enabled.
3. Output Waveform and Test Circuit figures below define the parameters.
4. Output is enabled if pad is floated or not connected.
Parameter
Condition
Min.
Typ.
Max.
Unit
Supply Voltage1
VDD
2.25
3.6
V
Supply Current
IDD
EN pin low – outputs are disabled
DSC8102
DSC8122
20
0.095
22
mA
Frequency Stability
Δf
Includes frequency variations due
to initial tolerance, temp. and
power supply voltage
±10
±25
±50
ppm
Aging
Δf
1 year @25°C
±5
ppm
Startup Time2
tSU
T=25°C
5
ms
Input Logic Levels
Input logic high
Input logic low
VIH
VIL
0.75xVDD
-
-
0.25xVDD
V
Output Disable Time3
tDA
5
ns
Output Enable Time
tEN
DSC8102
DSC8122
5
20
ms
ns
Enable Pull-Up Resistor4
Pull-up resistor exist
40
kΩ
LVPECL Outputs
Supply Current
IDD
Output Enabled, RL=50Ω
56.5
58
mA
Output Logic Levels
Output logic high
Output logic low
VOH
VOL
RL=50Ω
VDD-1.08
-
-
VDD-1.55
V
Pk to Pk Output Swing
Single-Ended
800
mV
Output Transition time3
Rise Time
Fall Time
tR
tF
20% to 80%
RL=50Ω, CL= 0pF
250
ps
Frequency
f0
Single Frequency
10
460
MHz
Output Duty Cycle
SYM
Differential
48
52
%
Period Jitter
JPER
2.5
psRMS
Integrated Phase Noise
JPH
200kHz to 20MHz @156.25MHz
100kHz to 20MHz @156.25MHz
12kHz to 20MHz @156.25MHz
0.25
0.38
1.7
2
psRMS
DSC81
125.0000
Freq (MHz)
125.0000
0
Enable Modes
0: Enable/Standby
2: Enable/Disable
-
Packing
T: Tape & Reel
: Tube
2
C
I
5
Package
A: 7.0x5.0mm
B: 5.0x3.2mm
C: 3.2x2.5mm
D: 2.5x2.0mm
N: 7.0x5.0mm (no center pad)
Temp Range
E: -20 to 70
I: -40 to 85
L: -40 to 105
M: -55 to 125
Stability
1: ±50ppm
2: ±25ppm
5: ±10ppm
T
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DSC8102 | DSC8122 Page 3 MK-Q-B-P-D-030411-02-2
DSC8102
Programmable Low-Jitter Precision LVPECL Oscillator
DSC8122
Nominal Performance Parameters (Unless specified otherwise: T=25° C, VDD=3.3 V)
Power supply rejection ratio
Phase jitter (integrated phase noise)
Output Waveform
Typical Termination Scheme
-80
-70
-60
-50
-40
-30
-20
-10
0
0.1 1 10 100 1000 10000
Rejection (dBc)
Supply Noise Frequency (kHz)
50-mV
100-mV
0.0
0.5
1.0
1.5
2.0
2.5
0200 400 600 800 1000
Phase Jitter (ps RMS)
Low-end of integration BW: x kHz to 20 MHz
156MHz-LVPECL
212MHz-LVPECL
320MHz-LVPECL
410MHz-LVPECL
VIL
1/fo
Output
Enable
tDA
tEN
tF
tR
VIH
80%
20%
50%
Output
830 mv
VDD
0.1uF
82 Ω
130 Ω
100 Ω
82 Ω
130 Ω
VDD
2
3 4
5
6
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DSC8102 | DSC8122 Page 4 MK-Q-B-P-D-030411-02-2
DSC8102
Programmable Low-Jitter Precision LVPECL Oscillator
DSC8122
Test Circuit
Solder Reflow Profile
0.1uF
VDD 0.01uF
IDD
VDA
6 4
5
1 3
2
LVPECL
LVPECL
VTT
50Ω50Ω
VTT= VDD-2.0V
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
Peak Temperature
255-260°C
Time within 5°C of actual Peak
20-40 Sec
Ramp-Down Rate
6°C/Sec Max.
Time 25°C to Peak Temperature
8 min Max.
60-150
Sec
20-40
Sec
60-180
Sec
8 min max
Pre heat
Reflow
Cool
Time
Temperature (°C)
3C/Sec Max.
6C/Sec Max.
200°C
217°C
150°C
25°C
260°C
3C/Sec Max.
60-150
Sec
20-40
Sec
60-180
Sec
8 min max
Pre heat
Reflow
Cool
Time
Temperature (°C)
3C/Sec Max.
6C/Sec Max.
200°C
217°C
150°C
25°C
260°C
60-150
Sec
20-40
Sec
60-180
Sec
8 min max
Pre heat
Reflow
Cool
Time
Temperature (°C)
3C/Sec Max.
6C/Sec Max.
200°C
217°C
150°C
25°C
260°C
3C/Sec Max.
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DSC8102 | DSC8122 Page 5 MK-Q-B-P-D-030411-02-2
DSC8102
Programmable Low-Jitter Precision LVPECL Oscillator
DSC8122
Package Dimensions
7.0 x 5.0 mm Plastic Package
5.0 x 3.2 mm Plastic Package
12
0.85
1.40
2.54
1.10
5.00
7.00
3.70
External Dimensions
units: mm[inch]
Output4 GND3 nc2
1Pin terminalNo. Enable
5VDD6
3
654
1 2 3
456
1.80
2.80
Output
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DSC8102 | DSC8122 Page 6 MK-Q-B-P-D-030411-02-2
DSC8102
Programmable Low-Jitter Precision LVPECL Oscillator
DSC8122
3.2 x 2.5 mm Plastic Package
2.5 x 2.0 mm Plastic Package
2.5±0.05 [0.098±0.002]
2.0±0.05 [0.079±0.002] 0.65±0.05 [0.026±0.002]
0.25±0.05 [0.099±0.002]
0.7±0.10 [0.028±0.004]
0.825 [ .032 ]
0.1 [.004] REF
0.9 [.035] REF
0.70 [0.028]
0.65 [0.026]
0.25 [0.0098]
0.85 [0.033]
0.375 [0.015]
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DSC8102 | DSC8122 Page 7 MK-Q-B-P-D-030411-02-2
DSC8102
Programmable Low-Jitter Precision LVPECL Oscillator
DSC8122
7.0 x 5.0 mm Plastic Package
Disclaimer:
Discera makes no warranty of any kind, express or implied, with regard to this material,
including, but not limited to, the implied warranties of merchantability and fitness for a
particular purpose. Discera reserves the right to make changes without further notice to
materials described herein. Discera does not assume any liability arising from the
application or use of any product or circuit described herein. Discera does not authorize its
products for use a critical components in life-support systems where a malfunction or
failure may reasonably be expected to result in significant injury to the user. The inclusion
of Discera’s product in a life-support systems application implies that the manufacturer
assumes all risk of such use and in doing so indemnifies Discera against all charges.
DISCERA, Inc. ● 1961 Concourse Drive, San Jose, California 95131 ● USA
Phone: +1 (408) 432-8600 ● Fax: +1 (408) 432-8609 ● Email: sales@discera.com ● www.discera.com
