High Stability Coefficient Oscillator -
I
2
C interface Oven Controlled Crystal Oscillator
MD-173
MD-173
The MD-173 is a Vectron “Coefficient Oscillator” (CCXO) that contains a high-stability ovenized crystal oscillator and an I
2
C
interface that communicates with temperature and current sensors, and an onboard EEPROM. The interface enables the customer
to improve upon the already exceptional stability of the oscillator. Provided in a fully hermetic 28 x 38 mm package, the device is
capable of aging rates of
≤
0.06 ppb/day and uncorrected temperature stabilities of 0.4ppb from 0 to 70
0
C. Use of the information
provided in the I
2
C interface provides a cost effective means of further improving temperature stability.
Features
• Reflow process compatible
• Uncorrected temperature stability to 0.4 ppb
• Aging rate to 0.06 ppb/day
• Frequency range 5 to 20 MHz
• Standard frequencies: 5, 10, 12.8, 20 MHz
• I
2
C interface with frequency coefficients, temperature
sensor, and current sensor
Applications
• LTE base stations
• Rubidium replacement
• Military communication equipment
Performance Specifications
Frequency Stabilities
1
(Stabilities listed for
≤10
MHz. For stabilities > 10 MHz refer to page 6)
Parameter
vs. Operating Temperature
Range (referenced to +25°C)
(uncorrected)
Initial Tolerance
vs. Supply Voltage Change
vs. Load Change
vs. Aging / Day
vs. Aging / Day
vs. Aging/ Day
vs. Aging / 1
st
Year
vs. Aging / Year (following year)
vs. Aging/ 10 years
Hysteresis
Retrace
2
Warm-up Time
Min
-0.4
-0.6
-0.8
-25
-0.5
-0.2
-1
-0.1
-0.06
-15
-10
-75
-0.2
-10
Typical
Max
+0.4
+0.6
+0.8
+25
+0.5
+0.2
+1
+0.1
+0.06
+15
+10
+75
+0.2
+10
5
Units
ppb
ppb
ppb
ppb
ppb
ppb
ppb
ppb
ppb
ppb
ppb
ppb
ppb
ppb
minutes
Condition
0 to +70°C
-20 to +70°C
-40 to +85°C
at time of shipment, nominal EFC
V
S
±5%
Load ±5%
after 24 hours operation
after 72 hours operation
after 7 days operation
after 72 hours operation
after 72 hours operation
maximum 4th order curve fit error
over -40 to 85 10
o
C/hour
to ±10ppb of final frequency (1 hour reading)
@ +25°C
Improved Frequency versus temperature F(T) performance obtained using on board temperature sensor (T) and frequency vs. tem-
perature coefficients (A
n
)stored in EEPROM, using formula:
F(T)=A
4
T
4
+A
3
T
3
+A
2
T
2
+A
1
T+A
0
Page 1 of 6
Vectron International • 267 Lowell Road, Unit 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Performance Specifications
Supply Voltage (Vs)
Parameter
Supply Voltage (Vs)
Min
4.75
11.4
Typical
5.0
12.0
Max
5.25
12.6
4.5
1.8
Units
VDC
VDC
Watts
Watts
Watts
Watt
Condition
Ordering code D
Ordering code B , temp stability T and J only
during warm-up, all temperatures
steady state @ +25°C
steady state @ -40°C
steady state @ +85°C
time required to achieve 90% of amplitude
frequencies ≥10 MHz
Power Consumption
4
1.0
RF Output
Start Time
Subharmonics
Signal [standard]
Load
Signal Level (Vol)
Signal Level (Voh)
Duty Cycle
Signal
Load
Output Power @ 5.0V,12 V
Harmonics
+5
50
+8
+11
-40
3.5
45
55
Sine Wave
Ω
dBm
dBc
16 bit DAC controlled through I2C interface
(fixed frequency option available)
15
0.5
HCMOS
pF
VDC
VDC
%
with Vs=5.0V & 12V and 15pF Load
with Vs=5.0V & 12V and 15pF Load
@ (Voh-Vol)/2
1
2
-30
s
dBc
Frequency Tuning (EFC)
Tuning range
Linearity
Tuning Slope
±150
10
Positive
±350
ppb
%
Additional Parameters
Parameter
Min
Typical
Max
-95
-125
-135
-140
-145
5e-12
8e-12
1e-11
5e-11
1
30
ppb/g
g
Units
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
Condition
1 Hz
10 Hz
100 Hz
1 kHz
10 kHz
1 s tau
10 s tau
100 s tau
1000 s tau
Phase noise
3
@ 10MHz
Allan Deviation
g-sensitivity
Weight
@ 10MHz
Page 2 of 6
Vectron International • 267 Lowell Road, Unit 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
EEPROM (SCL, SDA) Pin 1, Pin 2
Parameter
BUS voltage
SCL Clock Frequency
Communications
AC electrical characteristics
Devices and addresses
EEPROM - Atmel AT24C08C for EEPROM, address 1010100-1010111
Temperature Sensor - LM73 (set to 14 bit resolution), address 1001000
Current Sensor – MCP3021, address 1001101
DAC for EFC - TI DAC8571, address 101100
Reserved Addresses (used by factory)
1010100x
1010101x
1010110x
1010111x
1001000x
1001101x
0101001x
0101010x
0101000x
1001100x
1110111x
For full EEPROM Map please contact factory
0
2
Min
Typical
3.3
Max
100
Units
V
kHz
Condition
Reference I C Protocol
22.1 kOhm pull-up resistor used on SDA and
SCL lines
-40 to 85
o
C for all parameters
Absolute Maximum Ratings
15.0
Output load
25
50
open
VDC
pF
Ohms
CMOS
Sine
Operable temperature range implies the
device will continue to operate with no long-
term damage to unit; however, it will not be
specification compliant outside the operating
temperature range.
Operable temperature range
-55
+95
°C
Environmental and Product Classification
Shock (Endurance)
Sine Vibration (Endurance)
Random Vibration (Endurance)
Humidity
Seal
Altitude
Resistance to Soldering Heat
Terminal Strength
Moisture Sensitive Level
RoHS
Storage Temperature Range
MIL-STD-202, Method 213, Condition J, 30g 11 ms
MIL-STD-202, Method 201 and 204, Condition A, except 5g to 500 Hz, 1 sweep each axis
MIL-STD-202, Method 214, Condition I-D
MIL-STD-202, Method 103, Condition B, 100% rh
MIL-STD-202, Method 112, Condition D, hermetic, washable
MIL-STD-202, Method 105, sea level to space
MIL-STD-202, Method 210, Condition A,B,C
MIL-STD-202, Method 211, Condition C (5 bends at 45
o
, 2 lbs)
1
6 (fully compliant)
-55
+125
°C
Page 3 of 6
Vectron International • 267 Lowell Road, Unit 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Frequency vs temperature plot -uncorrected
Blue line - measured data -
Red line - curve fit of data.
Page 4 of 6
Vectron International • 267 Lowell Road, Unit 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Outline Drawing / Enclosure
Through hole
Package configuration A
Height “H”
Pin Length “L”
4.5 mm min
0
19 max
Pin Connections
1
2
3
I
2
C Clock
I
2
C Data
Supply Voltage Input (Vs)
RF Output
Ground (Case)
4
5
Dimensions in mm
Surface mount
Package configuration B
Height “H”
1
20.3 max
Pin Length “L”
4.5 mm min
Pin Connections
4,5,6,7,
11,12,13
1
2
3
8
9,10
No Connect
I
2
C Clock
I
2
C Data
Supply Voltage Input (Vs)
RF Output
Ground (Case)
all dimensions in mm
Page 5 of 6
Vectron International • 267 Lowell Road, Unit 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
