CTS
Reeves
FREQUENCY PRODUCTS
Model 120
DAC Controlled OCXO
CRYSTALS
Features:
• Internal 12 BIT Serial DAC
• Small Size
• High Stability
• Digitally Adjustable
CLOCKS
The Model 120 features an internal 12 BIT digital to
analog converter (DAC) which is serially addressable.
The inclusion of the DAC in the OCXO adds additional
ambient temperature control to this device, thus mini-
mizing frequency error due to DAC reference voltage
changes.
VCXOs
Electrical Specifications:
Parameter
Input Voltage
Supply Current - Warm-up
Steady State @ -40°C
Output
Load
Warm-up
Referenced to the frequency @ 1 hr.
Phase Noise
(1 Hz Bandwidth)
@8.192 MHz
Available Frequencies
4.8, 32.768 MHz
+12.0 Vdc
±30%
10 Watts max.
4 Watts Typical
TCXOs
HCMOS Compatible
20 pf
±5
x 10
-8
in 15 minutes
Offset
1 Hz
100 Hz
1 kHz
10 kHz
±5
x 10
-9
12 BIT Serial, MSB first Format
Sufficient for 15 years
±10%
Level (dBc/Hz)
-115
-140
-145
-145
Frequency vs Power Supply (±5%)
Digital Frequency Adjust
DAC Type
Tuning Range
Tuning Linearity
OCXOs
113
400 REIMANN AVE.
•
SANDWICH, IL 60548
Phone: 815-786-8411
•
Fax: 815-786-3600
•
E-Mail: www.ctsreeves.com
CTS
Reeves
CRYSTALS
FREQUENCY PRODUCTS
2.10 SQUARE MAX
Model 120
DAC Controlled OCXO
1.600
.800
.110 MIN
1.00 MAX
.025 MIN
Pin Connections
PIN
1
2
3
4
5
6
7
FUNCTION
RF OUTPUT
GROUND. CASE
PIN FUNCTION
1
RF OUTPUT
+19 TO +26V OSC
GROUND, CASE
2
CLK - CLOCK
3 +19 TO +26V OSC
4
CLK - CLOCK
SDI - SERIAL DATA IN
SDI - SERIAL DATA IN
5
6
LD - LOAD STROBE
LD - LOAD STROBE
7
N/C - CTS USE
N/C - CTS USE
3
C
L
4
5
6
.400
2
.800
.600
C
L
1.600
CLOCKS
1
7
PIN NUMBERS FOR REFERENCE
AND NOT MARKED ON UNIT.
INSULATING SPACER
.040
±.005
(7) PLACES
Mechanical Specifications:
VCXOs
Case:
Metal, hermetically sealed
Leads:
Kovar, solder coated
Seal:
Solder Seal
Leak Test:
Leak rate less than 5x10
-5
Atmosphere-cc/sec of helium
Solderability:
95% solder coverage, using RMA flux 63
SN/37 Pb at +245°C
±5°C
Temperature:
Operating: See chart
Storage: -55° to 85°C
Vibration:
5 G's sine, 10 to 500 Hz
Mechanical Shock:
50 G's 5ms pulse (3 shock/plane)
TCXOs
Ordering Information:
Model Type 120 ___ ___ ___ ___ ___ ___ ___
Temp. Range
Temp Stability
±5
x 10
-9
Temp Range Code
A
0° to 50° C A
X
0° to 70° C B
-30° to 70° C C
-40° to +85° C D
Stability
±1
x 10
-8
B
X
X
±2
x 10
-8
C
X
X
X
Aging
±5
x 10
-8
D
X
X
X
X
Freq. in MHz
±1
x 10
-7
E
X
X
X
X
1
st
Year Aging Code
±0.5
ppm
A
±0.3
ppm
B
±0.1
ppm
C
±0.05
ppm
D
OCXOs
114
Note: Not all Options are Available at all Frequencies. Consult Factory for Details.
400 REIMANN AVE.
•
SANDWICH, IL 60548
Phone: 815-786-8411
•
Fax: 815-786-3600
•
E-Mail: www.ctsreeves.com
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