CX4

CX4 CRYSTAL Fundamental Mode: 600 kHz to 1.4 MHz Overtone: 1.8432 MHz - 2.5 MHz ™ Ultra-Miniature Low Profile Surface Mount Quartz Crystal DESCRIPTION STATEK’s CX4 quartz crystals are hermetically sealed in an ultra-miniature low profile surface mount ceramic package. This high quality quartz resonator forms the basis of a stable oscillator. FEATURES XXX SX Ceramic Lid Shown PACKAGE DIMENSIONS D actual size side view Designed for low power applications in this frequency range Smallest available package in this frequency range Hermetically sealed ceramic package Excellent aging characteristics Full military testing to MIL-PRF-3098 available Designed and manufactured in the USA B APPLICATIONS C D E A TOP F BOTTOM Medical Pacemaker, defibrillator and hearing aid Industrial, Computer & Communications PCMCIA (FAX, Modem and LAN) Smart Card Military & Aerospace Airborne hybrid computer Low power system clock Hybrid multi-chip modules TYP. DIM A B C D E F DIM “C” MAX SM1 SM2 SM3 inches 0.197 0.072 0.038 0.020 0.025 mm 5.00 1.83 0.97 0.51 0.64 inches 0.210 0.085 0.048 - MAX. mm 5.33 2.16 1.22 - see below GLASS LID inches 0.045 0.046 0.048 mm 1.14 1.17 1.22 CERAMIC LID inches 0.050 0.051 0.053 mm 1.27 1.30 1.35 EQUIVALENT CIRCUIT SUGGESTED LAND PATTERN 0.059 (1.5) C0 1 L1 C1 R1 2 0.092 (2.3) R1 Motional Resistance L1 Motional Inductance C1 Motional Capacitance C0 Shunt Capacitance 0.160 (4.0) inches (mm) 10161 Rev A S YS TEM C ERT I F I C AT N IO STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com IS O 90 01 SPECIFICATIONS TYPICAL APPLICATION FOR A PIERCE OSCILLATOR Specifications are typical at 25OC unless otherwise noted. Specifications are subject to change without notice. Parameters Frequency, (Hz) Motional Resistance, R1 (Ω) Motional Resistance, R1 MAX Motional Capacitance, C1 (fF) Quality Factor, Q (k) Shunt Capacitance, C0 (pF) Standard Calibration Tolerance* 3.5 250 1.0 + _ + _ + _ Fundamental 600 K 1.0 M 300 400 600 3KΩ 2.0 200 0.8 1.3 150 0.7 + _ Overtone 500 1000 1.4 M 1.8432 M 2.4576 M 3.5 80 1.0 1.5 45 0.8 The CX4 family of surface mount crystals are ideal for small, high density, battery operated portable products. The CX4 crystal designed in a Pierce oscillator (single inverter) circuit provides very low current consumption and high stability. A conventional CMOS Pierce oscillator circuit is shown below. The crystal is effectively inductive and in a PInetwork circuit with CD and CG provides the additional phase shift necessary to sustain oscillation. The oscillation frequency (f0) is 50 to 250 ppm above the crystal’s series resonant frequency (fS). Drive Level RA is used to limit the crystal’s drive level by forming a voltage divider between RA and CD. RA also stabilizes the oscillator against changes in the amplifiers output resistance (R0). RA should be increased for higher voltage operation. Load Capacitance The CX4 crystal calibration tolerance is influenced by the effective circuit capacitances, specified as the load capacitance (CL). CL is approximately equal to: CL = CD x CG CD + CG + CS 500 ppm ( 0.05%) _ 1000 ppm ( + 0.1%) _ 10000 ppm ( + 1.0%) Drive Level 3 µW MAX Load Capacitance, CL** 7pF Turning Point, T0** 35OC Temperature Coefficient, k -0.035 ppm/OC2 TYP Note: Frequency f at temperature T is related to frequency f0 at turning point temperature T0 by: f-f0 2 = k(T-T0) f0 Functional Mode Extensional Aging, first year 5ppm MAX Shock, survival 1500 g peak, 0.3 ms, 1/2 sine Vibration, survival 20 g RMS, 10-2,000 Hz random Operating Temp. Range -10OC to +70OC (Commercial) -40OC to +85OC (Industrial) -55OC to +125OC (Military) Storage Temp. Range -55OC to +125OC (1) NOTE: CD and CG include stray layout to ground and CS is the stray shunt capacitance between the crystal terminal. In practice, the effective value of CL will be less than that calculated from CD, CG and CS values because of the effect of the amplifier output resistance. CS should be minimized. The oscillation frequency (f0) is approximately equal to: f0 = fS 1 + Where f S C1 C0 C1 2(C0 + CL) Max Process Temperature *Tighter tolerances available **Other values available 260OC for 20 sec. [ ] (2) NOTE: All values subject to change without notice. TERMINATIONS = Series resonant frequency of the crystal = Motional Capacitance = Shunt Capacitance Designation SM1 SM2 SM3 Termination Gold Plated Solder Plated Solder Dipped CONVENTIONAL CMOS PIERCE OSCILLATOR CIRCUIT Rf BUFFER OSC Freq (fO ) PACKAGING OPTIONS CX4 - Tray Pack - Tape and Reel (Reference tape and reel data sheet 10109) AMPLIFIER RA HOW TO ORDER CX4 CRYSTALS CX4 S C SM1 1.8432M Frequency K = kHz M = MHz , 500 Calibration Tolerance @25OC (in ppm) / M Operating Temp. Range: C = -10OC to +70OC I = -40OC to +85OC M = -55OC to +125OC S = Customer Specified CG C = Ceramic Lid Blank = Glass Lid “S” if special or custom design. Blank if standard CX4 XTAL CD SM1 = Gold Plated SM2 = Solder Plated SM3 = Solder Dipped 10161 Rev A S YS TEM C ERT I F I C AT N IO STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com IS O 90 01