IQXT-274 Datasheet, PDF (1/3 Pages) IQD Frequency Products Ltd – TCXO Specification

ISSUE 1; July 2016
Description
The IQXT-274 with voltage control option, employs an
analogue IC for the oscillator and temperature compensation.
The crystal is surface mounted on top of the ceramic IC
carrier. The segregation of the crystal from the oscillator
further improves the reliability of the product.
Applications:
Feature phone
Wi-Fi
Wi-MAX/W-LAN
Frequency Parameters
Frequency
10.0MHz to 40.0MHz
Frequency Tolerance
±1.00ppm
Frequency Stability
±0.50ppm to ±5.00ppm
Frequency calibration: Offset from nominal frequency
measured at 25°C
Reflow shift: Two consecutive reflows as per profile after 1
hour recovery at 25°C: ±1ppm max
Frequency stability over temperature: referenced to the
midpoint between minimum and maximum frequency value
over the specified temperature range. Control voltage set to
midpoint of control voltage (Note 1)
Frequency slope, minimum of 1 frequency reading every 2°C,
over the operating temperature range (Note 1): 0.05 to
1ppm/°C
Static temperature hysteresis: frequency change after
reciprocal temperature ramped over the operating range.
Frequency measured before and after at 25°C: ±0.6ppm max
Supply voltage variation (±5% change at 25°C): ±0.1ppm max
Load variation (±10% change, note 2): ±0.2ppm max
Long term stability, frequency drift over 1 year at 25°C: ±2ppm
max
Electrical Parameters
Supply voltage range: 2.4 to 3.7V
Supply current (see note 2)
Note 1: Parts should be shielded from drafts causing
unexpected thermal gradients. Temperature changes due to
ambient air currents can lead to short term frequency drift.
Note 2: Specified for the load stated in the oscillator output
section at 25°C
Note 3: Voltage control cannot exceed Vcc -0.2V or below GND
+0.2V
Note 4: The maximum frequency tuning range depends on the
design frequency and the trimming sensitivity of the crystal.
Linearity performance degrades if maximum frequency tuning
setting is selected
Note 5: External AC-Coupling capacitor required. 1nF or greater
recommended
Frequency Adjustment
Pulling
±6ppm to ±50ppm
Input Impedence
500kΩ min
Control voltage range: The nominal control voltage value is
midway between the minimum and maximum. (Note 3): 0.5 to
2.8V
Linearity (deviation from straight line curve fit): 20% max
TCXO Specification
IQXT-274
Outline (mm)
Pb-Free Reflow
Sales Office Contact Details:
UK: [phone]
Germany: 0800 1808 443
France: 0800 901 383
USA: +1.760.318.2824
Printed on 31 Aug 16 11:05 using Model Data Sheet V1.2550
Email: [e-mail]
Web: www.iqdfrequencyproducts.com
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