DSC8101
DSC8121
Programmable Low-Jitter Precision CMOS Oscillator
General Description
The DSC8101 & DSC8121 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.
DSC8101 has a standby feature allowing it to
completely power-down when EN pin is
pulled low; whereas for DSC8121, only the
outputs are disabled when EN is low. Both
oscillators are available in industry standard
packages, including the small 3.2x2.5 mm
2
,
and are “drop-in” replacement for standard
4-pin CMOS quartz oscillators.
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
Short Lead Time: 2 Weeks
Wide Freq. Range: 10 to 170 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
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
DisplayPort
Output Enable Modes
EN Pin
High
NC
Low
DSC8101
Output Active
Output Active
Standby
DSC8121
Output Active
Output Active
Output Disabled
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DSC8101 | DSC8121
Page 1
MK-Q-B-P-D-030411-01-2
DSC8101
DSC8112
1
Min
-0.3
-0.3
-
-55
-
-
4000
400
1500
Programmable Low-Jitter Precision CMOS Oscillator
Absolute Maximum Ratings
Item
Supply Voltage
Input Voltage
Junction Temp
Storage Temp
Soldering Temp
ESD
HBM
MM
CDM
Ordering Code
Condition
Enable Modes
0: Enable/Standby
2: Enable/Disable
Temp Range
E: -20 to 70
I: -40 to 85
L: -40 to 105
M: -55 to 125
Packing
T: Tape & Reel
: Tube
Max
+4.0
V
DD
+0.3
+150
+150
+260
Unit
V
V
°C
°C
°C
V
40sec max.
DSC81
0
1
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)
-
125.0000
T
Freq (MHz)
125.0000
Stability
1: ±50ppm
2: ±25ppm
5: ±10ppm
Note: 1000+ years of data retention on internal memory
Specifications
Parameter
Supply Voltage
1
Supply Current
Frequency Stability
Ext Comm. & Ind. only
All temp ranges
All temp ranges
Aging
Startup Time
2
Input Logic Levels
Input logic high
Input logic low
Output Disable Time
3
Output Enable Time
Enable Pull-Up Resistor
4
V
DD
I
DD
EN pin low – output is disabled
DSC8101
DSC8121
Includes frequency variations due
to initial tolerance, temp. and
power supply voltage
1 year @25°C
T=25°C
0.75xV
DD
-
DSC8101
DSC8121
Pull-up resistor exist
40
Condition
Min.
2.25
Typ.
Max.
3.6
0.095
22
±10
±25
±50
±5
5
-
0.25xV
DD
5
5
20
Unit
V
mA
20
Δf
Δf
t
SU
V
IH
V
IL
t
DA
t
EN
ppm
ppm
ms
V
ns
ms
ns
kΩ
CMOS Output
Supply Current
4
Output Logic Levels
Output logic high
Output logic low
Output Transition time
3
Rise Time
Fall Time
Frequency
Output Duty Cycle
Period Jitter
Integrated Phase Noise
1.
2.
3.
4.
I
DD
V
OH
V
OL
t
R
t
F
f
0
SYM
J
PER
J
PH
output is enabled
C
L
=15pF, F
0
=125 MHz
I=±6mA
20% to 80%
C
L
=15pF
All temp range except Auto
Auto temp range
Fout=125MHz
200kHz to 20MHz @ 125MHz
100kHz to 20MHz @ 125MHz
12kHz to 20MHz @ 125MHz
10
45
0.9xV
DD
-
31
35
-
0.1xV
DD
mA
V
1.1
1.3
2
2
170
100
55
ns
MHz
%
ps
RMS
ps
RMS
3
0.3
0.38
1.7
2
Pin 6 V
DD
should be filtered with 0.1uf capacitor.
t
su
is time to 100PPM of output frequency after V
DD
is applied and outputs are enabled.
Output Waveform and Test Circuit figures below define the parameters.
Output is enabled if pad is floated or not connected.
_____________________________________________________________________________________________________________________________ _________________
DSC8101 | DSC8121
Page 2
MK-Q-B-P-D-030411-01-2
DSC8101
DSC8112
1
Programmable Low-Jitter Precision CMOS Oscillator
Nominal Performance Parameters
(Unless specified otherwise: T=25° C, V
DD
=3.3 V)
2.5
0
25MHz-CMOS
Phase Jitter (ps RMS)
2.0
-10
50-mV
100-mV
50MHz-CMOS
106MHz-CMOS
Rejection (dBc)
1000
-20
-30
-40
-50
-60
-70
1.5
125MHz-CMOS
1.0
0.5
0.0
-80
0
200
400
600
800
0.1
1
10
100
1000
10000
Low-end of integration BW: x kHz to 20 MHz
Supply Noise Frequency (kHz)
Phase jitter (integrated phase noise)
Power supply rejection ratio
Output Waveform
t
R
V
OH
t
F
Output
V
OL
1/f
o
t
DA
V
IH
t
EN
Enable
V
IL
Typical Termination Scheme
V
DD
0.1uF
6
2
3
5
4
Rs
50 Ω
Rs = 0 Ω f or test
Rs serves to match the trace
impedances. Depending on
board layout, the value may
range from 0 to 30 ohms.
C
L
CMOS load
capacitance
_____________________________________________________________________________________________________________________________ _________________
DSC8101 | DSC8121
Page 3
MK-Q-B-P-D-030411-01-2
DSC8101
DSC8112
1
Programmable Low-Jitter Precision CMOS Oscillator
Test Circuit
I
DD
4
6
5
2
3
4
V
DD
0.1uF
1
1
2
3
15pF
V
DA
Board Layout (recommended)
Solder Reflow Profile
ax
260
°
C
Temperature (°C)
Se
cM
.
20-40
Sec
217
°
C
200
°
C
ax
.
60-150
Sec
150
°
C
3C
/Se
60-180
Sec
cM
Reflow
Pre heat
8 min max
Cool
Time
25
°
C
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.
3C
/
_____________________________________________________________________________________________________________________________ _________________
DSC8101 | DSC8121
Page 4
MK-Q-B-P-D-030411-01-2
S
S
S
6C
6C
6C/
M
cM
cM
ec
a.
a.
a x.
PCB Design
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