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參數資料
| 型號： | QEM77-AHFREQFT28 |
| 廠商： | TEMEX COMPONENTS |
| 元件分類： | XO, clock |
| 英文描述： | CRYSTAL OSCILLATOR, CLOCK, 5 MHz - 16 MHz, HCMOS OUTPUT |
| 文件頁數： | 1/2頁 |
| 文件大小： | 34K |
| 代理商： | QEM77-AHFREQFT28 |
MILITARY CRYSTAL OSCILLATORS
QEM 77-AH (Package 41x41)
5-42
Vol. 2
SALES OFFICES: VISIT OUR WEB SITE AT
http://www.temex.net
Table 1:
Other temperature ranges and stability available
Typical value at
QEM 77-AH
at 10 MHz
FMCXO output: 10 MHz, 5 MHz, 1 MHz user-selectable by external digital control
FM1 output: 1 Hz
Calibration precision
Nominal frequency suitability at 25° C attained for 1.4 V ±1% on pin 18
Normal operation mode:
≤ 7 mA
Input current
Stand-by mode
≤ 5 mA
Start-up
≤ 7 mA
Output levels
"0"
≤ 0.4 V / "1" ≥ 2.4 V
Load
1 LS-TTL
Duty cycle
50 / 50 ± 5% at Vcc/2
Rise/Fall time
≤ 20 nS between 20% and 80% of the actual output level, at 25° C ±2° C
Frequency adjustment
≥ ±1 ppm (suitability to ±4 ppb)
@ 10 MHz
potentiometer 47 k
between pin 18 and GND or
control voltage 0 to 3 V on pin 18 (slope 1 ppm / V)
delay between adjustment and corresponding change of FMCXO:
≤ 500 S to 4 ppb
or
≤ 500 S to 100 ppb of FMCXO
Description
The MCXO combines the advantages of OCXOs and
TCXOs, delivering the frequency stability of an
ovenized oscillator with the power consumption
associated
with
temperature
compensated
oscillators and do so over the entire military range
of -55° C to +125° C. Using digital techniques, it is
possible to operate a stand-by mode with low
power consumption and to synchronize the 1 Hz
signal with an external source. In addition, a choice
of output frequencies is available.
HIGH STABILITY MCXO
Frequency range
5 MHz to 16 MHz
Applications
Synchronization system
Test equipment
Military radio
Low power equipment
Features
Temperature ranges:
up to -55° C to +125° C
Frequency stability:
≤ ±0.02 to ±0.1 ppm
Supply voltage:
3.25 V to 6 V
Input current (Stand-by mode):
≤ 5 mA
Output current FMCXO:
≤ ±0.5 mA
Short term stability:
≤ ±0.02 ppm / 1 S
Frequency adjustment:
≥ ±5 ppm
Ageing:
≤ ±0.001 ppm/day
≤ ±0.01 ppm/month
Minimum ordering information requirement
(See Table 1 for available combinations)
(See page 5-46 for package drawing)
Example: QEM 77 - AH 10 MHz AY17
Output
AH = HCMOS
Temperature range
LM = 0° C ~+50° C
FT = -30° C ~ +85° C
AY = -55° C ~ +125° C
Thermal stability
28 = ±0.02 ppm
17 = ±0.1 ppm
Notes
1. Options with the same marker may not be combined with each
other.
2. Secondary functions: please, ask for the technical notes. The
secondary functions of the MCXO are obtained by two methods:
Application of logic levels on the pin-out
Inputting bytes on the RS232 port.
QEM77
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