CX3SCSM2

CX3SM CRYSTAL 800 kHz to 1.35 MHz Low Profile Miniature Surface Mount Quartz Crystal ™ DESCRIPTION actual size The CX3SM quartz crystals are leadless devices designed for surface mounting on printed circuit boards or hybrid substrates. They are hermetically sealed in a rugged, miniature ceramic packages and are designed specifically for manufacturing temperatures up to 260OC. side view Glass Lid Shown PACKAGE DIMENSIONS FEATURES D Extensional mode Ideal for use with microprocessors Designed for low power applications Compatible with hybrid or PC board packaging Low aging Full military testing available Ideal for battery operated applications Designed and manufactured in the USA B C A TOP BOTTOM E D E EQUIVALENT CIRCUIT C0 DIM inches 0.263 0.097 0.052 0.030 TYP. mm 6.68 2.46 1.32 0.76 inches 0.270 0.104 0.058 0.035 MAX. mm 6.86 2.64 1.47 0.89 1 L1 C1 R1 2 A B C D E DIM “C“” MAX see below R1 Motional Resistance L1 Motional Inductance C1 Motional Capacitance C0 Shunt Capacitance GLASS LID inches 0.053 0.055 0.058 mm 1.35 1.40 1.47 CERAMIC LID inches 0.067 0.069 0.072 mm 1.70 1.75 1.83 SUGGESTED LAND PATTERN 0.070 (1.78) SM1 SM2 SM3 0.110 (2.79) inches (mm) 0.210 (5.33) 10123 - Rev B S YS ERT T E M C IFIC T A N IO RSG Electronic Components GmbH - Sprendlinger Landstr. 115 - 63069 Offenbach - Germany - www.rsg-electronic.de 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. Frequency Range Functional Mode Calibration Tolerance* 800 kHz - 1.35 MHz Extensional 500 ppm (0.05%) 1000 ppm (0.1%) + _ 10000 ppm (1.0%) 7 pF + _ + _ Load Capacitance Motional Resistance (R1) Motional Capacitance (C1) Quality Factor (Q) Shunt Capacitance (C0) Drive Level Turning Point (T0)** 5 kΩ MAX 1.2 fF 150 k 1.0 pF 3 µW MAX. 35OC The low profile CX miniature surface mount crystal is ideal for small, high density, battery operated portable products. The CX 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 PI-network circuit with CD and CG provides the additional phase shift necessary to sustain oscillation. The oscillation frequency (f0) is 15 to 150 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 CX 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 Temperature Coefficient (k) -0.035 ppm/OC2 Note: Frequency f at temperature T is related to frequency f0 at turning point temperature T0 by: f-f0 2 = k (T-T0) f0 Aging, first year Shock, survival Vibration, survival Operating Temp. Range 5 ppm MAX 1000 g peak, 0.3 ms,1/2 sine 10 g RMS, 20-1,000 Hz random -10OC to +70OC (Commercial) -40OC to +85OC (Industrial) -55OC to +125OC (Military) -55OC to +125OC 260OC for 20 sec. (1) Storage Temp. Range Max Process Temperature * Tighter tolerances available. ** Other values available. 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 PACKAGING OPTIONS C [1 + 2(C 1 0 + CL) ] (2) CX3SM - Tray Pack - Tape and Reel (Reference tape and reel data sheet 10109) Where f S C1 C0 = Series resonant frequency of the crystal = Motional Capacitance = Shunt Capacitance TERMINATIONS CONVENTIONAL CMOS PIERCE OSCILLATOR CIRCUIT Designation SM1 SM2 SM3 Termination Gold Plated Solder Plated Solder Dipped Rf BUFFER OSC Freq (fO ) HOW TO ORDER CX3SM CRYSTALS CX3 S C SM1 1.0M, 500 Calibration Tolerance @ 25OC (in ppm) Frequency K = kHz M = MHz AMPLIFIER RA / M “S” if special or custom design. Blank if Std. SM1 = Gold Plated SM2 = Solder Plated SM3 = Solder Dipped Blank = Glass Lid C = Ceramic Lid Operating Temp. Range: C = -10OC to +70OC I = -40OC to +85OC M = -55OC to +125OC S = Customer Specified CG CX3 XTAL CD 10123 - Rev B S YS ERT T E M C IFIC T A N IO RSG Electronic Components GmbH - Sprendlinger Landstr. 115 - 63069 Offenbach - Germany - www.rsg-electronic.de IS O 90 01