Model 637
Features
Ceramic Surface Mount Package
Very Low Phase Jitter Performance, 500fs Maximum
Fundamental or 3
rd
Overtone Crystal Design
Frequency Range 10 – 320MHz *
+2.5V or +3.3V Operation
Output Enable Standard
Tape and Reel Packaging, EIA‐418
Very Low Jitter LVPECL or LVDS Clock
Part Dimensions:
7.0 × 5.0 × 2.0mm • 178.462mg
Applications
SerDes
Storage Area Networking
Broadband Access
SONET/SDH/DWDM
PON
Ethernet/GbE/SyncE
Fiber Channel
Test and Measurement
Standard Frequencies
‐ 25.00MHz
‐ 50.00MHz
‐ 100.00MHz
‐ 125.00MHz
‐ 155.52MHz
‐ 156.25MHz
‐ 161.1328MHz
‐ 187.50MHz
‐ 200.00MHz
‐ 212.50MHz
‐ 250.00MHz
‐ 312.50MHz
* Check with factory for availability.
Description
CTS Model 637 is a low cost, high performance clock oscillator supporting differential LVPECL or LVDS outputs.
Employing the latest IC technology, M637 has excellent stability and low jitter/phase noise performance.
Ordering Information
Model
637
Output Type
P
Frequency Code
[MHz]
X X X or X X XX
Frequency
Stability
3
Temperature
Range
I
Supply
Voltage
3
Packaging
T
Code
P
L
E
V
Output
LVPECL ‐ Pin 1 Enable
LVDS ‐ Pin 1 Enable
LVPECL ‐ Pin 2 Enable
LVDS ‐ Pin 2 Enable
Code
6
5
3
2
Stability
±20ppm
±25ppm
±50ppm
±100ppm
2
Code
2
3
Voltage
+2.5Vdc
+3.3Vdc
Code
Frequency
1
Product Frequency Code
Code Temp. Range
‐10°C to +60°C
A
‐20°C to +70°C
C
‐40°C to +85°C
I
Packing
Code
1k pcs./reel
T
Notes:
1] Refer to document 016‐1454‐0, Frequency Code Tables. 3‐digits for frequencies <100MHz, 4‐digits for frequencies 100MHz or greater.
2] Consult factory for availability of 6I Stability/Temperature combination.
Not all performance combinations and frequencies may be available.
Contact your local CTS Representative or CTS Customer Service for availability.
DOC# 008‐0453‐0 Rev. B
Page 1 of 8
©2015 CTS® Corporation.
Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Model 637
Very Low Jitter LVPECL or LVDS Clock
Electrical Specifications
Operating Conditions
P
ARAMETER
Maximum Supply Voltage
Supply Voltage
Supply Current
LVP
ECL
LVDS
O
perating Temperature
Storage Temperature
T
A
T
STG
‐
‐
I
CC
Maximum Load
‐
‐
‐20
‐40
‐40
55
45
+25
‐
88
66
+70
+85
+125
mA
SYMBO L
V
CC
V
CC
CO NDITIO NS
‐
±5%
MIN
‐0.5
2.375
3.135
TYP
‐
2.5
3.3
MAX
5.0
2.625
3.465
UNIT
V
V
°C
°C
Frequency Stability
P
ARAMETER
Frequenc
y
Range
LVP
ECL
LVDS
Frequenc
y
Stability
[Note 1]
SYMBO L
f
O
CO NDITIO NS
‐
MIN
TYP
10 ‐ 320
10 ‐ 320
MAX
UNIT
MHz
±ppm
3
ppm
Δf/f
O
Δf/f
25
‐
First Year @ +25°C, nominal V
CC
‐3
20, 25, 50 or 100
‐
Aging
1.] Inclusive of initial tolerance at time of shipment, c hanges in supply voltage, load, temperature and 1st year aging.
Output Parameters
P
ARAMETER
O
utput Type
O
utput Load
SYMBO L
‐
R
L
V
OH
O
utput Voltage Levels
V
OL
V
OH
V
OL
O
utput Duty
Cy
c le
Rise and Fall Time
SYM
T
R
, T
F
CO NDITIO NS
‐
Terminated to V
CC
‐ 2.0V
PECL Load, ‐20°C to +70°C
‐
V
CC
‐ 1.025
V
CC
‐ 1.810
V
CC
‐ 1.085
V
CC
‐ 1.830
45
‐
MIN
TYP
LVPECL
50
‐
‐
‐
‐
‐
0.3
LVDS
‐
‐
0.90
45
247
1.125
‐
100
1.43
1.10
‐
330
1.25
0.4
‐
1.60
‐
55
454
1.375
0.7
‐
V
CC
‐ 0.880
V
CC
‐ 1.620
V
CC
‐ 0.880
V
CC
‐ 1.555
55
0.7
MAX
UNIT
‐
Ohms
V
PECL Load, ‐40°C to +85°C
@ V
CC
‐ 1.3V
@ 20%/80% Levels, R
L
= 50 Ohms
V
%
ns
O
utput Type
O
utput Load
O
utput Voltage Levels
O
utput Duty
Cy
c le
Differential O
utput Voltage
O
ffset Voltage
Rise and Fall Time
‐
R
L
V
OH
V
OL
SYM
V
OD
V
OS
T
R
, T
F
‐
Between Outputs
LVDS Load
@ 1.25V
R
L
= 100 Ohms
LVDS Load
@ 20%/80% Levels, R
L
= 100 Ohms
‐
Ohms
V
%
mV
V
ns
DOC# 008‐0453‐0 Rev. B
Page 2 of 8
©2015 CTS® Corporation.
Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Model 637
Very Low Jitter LVPECL or LVDS Clock
Electrical Specifications
Output Parameters
P
ARAMETER
Start Up Time
Enable Func
tion [Standby ]
Enable Input Voltage
Disable Input Voltage
Disable Time
Enable Time
P
hase Jitter, RMS
P
eriod Jitter, pk‐pk
P
eriod Jitter, RMS
V
IH
V
IL
T
PLZ
T
PLZ
tjrms
pjpk‐pk
pjrms
Pin 1 or 2 Logic '1', Output Enabled
Pin 1 or 2 Logic '0', Output Disabled
Pin 1 or 2 Logic '0', Output Disabled
Pin 1 or 2 Logic '1', Output Enabled
Bandwidth 12 kHz ‐ 20 MHz
‐
‐
0.7V
CC
‐
‐
‐
‐
‐
‐
‐
‐
‐
‐
300
2.6
25
‐
0.3V
CC
200
2
500
‐
‐
V
V
ns
ms
fs
ps
ps
SYMBO L
T
S
CO NDITIO NS
Application of V
CC
MIN
‐
TYP
2
MAX
5
UNIT
ms
Enable Truth Table
Pin 1 or Pin 2
Logic ‘1’
Open
Logic ‘0’
Pin 4 & Pin 5
Output
Output
High Imp.
Test Circuit
LVPECL
LVDS
Output Waveform
LVPECL or LVDS
DOC# 008‐0453‐0 Rev. B
Page 3 of 8
©2015 CTS® Corporation.
Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Model 637
Very Low Jitter LVPECL or LVDS Clock
Electrical Specifications
Performance Data
Phase Noise [typical]
25MHz, LVPECL, V
CC
= 3.3V, T
A
= +25°C
100MHz, LVPECL, V
CC
= 3.3V, T
A
= +25°C
DOC# 008‐0453‐0 Rev. B
Page 4 of 8
©2015 CTS® Corporation.
Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Model 637
Very Low Jitter LVPECL or LVDS Clock
Electrical Specifications
Performance Data
Phase Noise [typical]
312.50MHz, LVPECL, V
CC
= 3.3V, T
A
= +25°C
155.52MHz, LVDS, V
CC
= 3.3V, T
A
= +25°C
DOC# 008‐0453‐0 Rev. B
Page 5 of 8
©2015 CTS® Corporation.
Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
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