|
This new design concept features a precision double
oven crystal oscillator capable of analog or digital tuning. The
serial digital tuning is ideal for disciplined applications in today’s
telecommunications industry where holdover is important. The temperature
coefficient of this device is less than 1x10-10.
This is accomplished with no over or under shoot, with fast temperature
slew rates of 4°C per minute. Performance is Determined by a
Double Oven SC Cut 5 th Overtone Crystal. Output Frequency is Digitally
Synthesized.
Technical Highlights
Superior crystal oscillator precision
is required for both time and frequency in precision instrument
applications such as synthesizers, counters and spectrum analyzers.
The same high end performance characterisics are required in satellite
transmissions, geophysical survey positioning systems, and standard
time/time-interval generation and transfer. Using breakthrough design
and packaging concepts, FEI has applied advanced technologies to
create the best of both worlds... with small size and low costs.
This makes the FE-205A, FE- 405A, and FE-505A your best choices
for applications in which it is essential to combine excellent spectral
purity with short- and long-term stability.
| Physical Characteristics |
| FE-205A |
2.00" x 2.00" x 1.50" |
| FE-405A |
3.01" x 3.03" x 1.44" |
| FE-505A |
2.98" x 2.80" x 0.89" |
| Supply
Voltage |
Standard
+15v DC ±5%, l amp max
+5v DC±5%, 200ma
Option 20 for single 15v input
|
| Warm-Up Power |
7W, max |
| Steady State |
3.5W Max at 25¡C |
| Environmental |
| Operating Temperature
Range |
-40¡C to +75¡C
meets all specifications |
Operational
Temperature Range
|
-55¡C to +85¡C may not meet freq. stability |
| |
|
| Options Available |
| Option
20 |
15V DC - Input |
| Option 28 |
Aging 2.5x10-11/day
after 15 days of continuous Operation |
| Option 30 |
Analog Tuning (0V to 10V) |
| * Contact factory for specials
including custom packages |
|
|
Output
Frequency |
10MHz and 15MHz
Standard (Option for any other frequency 5 to 25MHz) |
| RF
Output |
- Level:
9dBm ±2dBm into 50 ohm load
- Waveform:
Sine wave
- Harmonics:
-40dBc max
- Spurious:
-65dBc to 1 GH
|
Allan Variance
(Short Term Frequency Stability) |
| t=1 second |
(1 x 10-11) |
| t=10 second |
(2 x 10-12) |
| t=100 second |
(1 x 10-12) |
|
| Long Term
Stability |
5 x 10-10
/day, 5 x 10-8 /year |
| Frequency
Temperature Stability |
<1 x 10 -10
(-40° C to +75° C) (Including frequency over or undershoot
at any fast or slow temperature slew rate) |
| |
|
Phase
Noise
|
1Hz
|
-85dBc/Hz |
10Hz
|
-95dBc/Hz |
100Hz
|
-125dBc/Hz |
1
KHz
|
-135dBc/Hz |
| 10 KHz |
-145dBc/Hz |
|
| Aging |
| Per Day |
<1 x 10 (after 14 days continuous
operation)
Typical 5 x 10 -11 |
| Per Year |
<1 x 10 -8 |
| Per 10 Years |
<5 x 10 -8 |
|
| Frequency
Retrace |
1 x 10-10 in 1 hr. after
24 hours power off
5 x 10-10 in 20 min. after
24 hours power off
|
| G-Sensitivity |
2 x 10-9
per G, any axis |
| Input Voltage |
±15 VDC± 5% |
| Input Voltage
Sensitivity |
±1 x 10-9
for ±5% |
| Digital Frequency Adjustment:
Standard |
| RF Output
Frequency Adjustment: |
Digital control Via TTL serial port interface. For detail
see Manual.
|
| Serial Communication |
9600 Baud, TTL level, 8 bits,
no parity, 1 stop bit |
|
Adjustment resolution
|
LSB ÷ 1.7 x 10-14
|
| Adjustment
Range |
• ± 20Hz for 15MHz output
• ± 9.5Hz for 10MHz output
(Other trim ranges can be special ordered) |
| Analog Frequency Adjustment:
Option 30 |
| Coarse Adjust
Range |
±2.4 x 10-7
Via DC input of 5v±5v (0 to +10v) |
| Fine Adjust
Range |
±0.5 x 10-8
Via DC input of 5v±5v (0 to +10v) |
|
Analog or Digital Interface (LSB "1.7 x10