QEM77AH 04-05-2001 QEM77-AH 41 x 41 mm / 19 pins MCXO Operating Procedure TEMEX TIME & FREQUENCY Frequency Range : Applications : 5 MHz to 10 MHz Synchronization System Test equipment Military Radio Low Power Equipment Description : The MCXO offers the parameters of OCXO's and TCXO's, delivering practically the frequency of an ovenized oscillator with the power consumption associated with temperature compensated oscillators 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 frequency is available. Control of Secondary functions : The secondary functions of the MCXO are obtained by two methods : • application of logic levels on the pin-out as indicated • inputting bytes on the RS232 port. The details of the logic controls are shown on the following pages. Block-Diagram : Vcc CTRL Gnd supply voltage stabilisation dual-mode oscillator F0 PC7 RESET IRQ FDDSI VPP6 PD4 digital direct synthesis F3 PLL FMCXO 1, 5 or 10 MHz /3 FM1 (1 Hz output) N2 1 Hz synch. FM2 (1 Hz input) delta PD5 (synch enable) Fβ n n Fβ /2 Counter /2 N1 A /D converter Microcontroller RS 232 out RS 232 in PD1 PD2 PD6 PD7 SALES OFFICES: Benelux: +33 (0) 1 46 90 23 00 / Germany: +49 (0) 89 820 796-27/ Nordic: +46 (0) 8 59030300 France: +33 (0) 1 46 90 23 00 / Italy: +39 (0) 738 8869 / Spain: +33 (0) 1 46 90 23 00 / UK: +44 (0) 1256 883340 USA: +1 (623) 780-1995 / Asia-Pacific : +33 (0) 5 56 46 66 84 WEB SITE: http://www.temex-components.com Specifications are subject to change without notice - Page 1 / 7 QEM77AH 04-05-2001 QEM77-AH 41 x 41 mm / 19 pins MCXO Operating Procedure TEMEX TIME & FREQUENCY Typical value for 10 MHz output frequencies frequency variations vs. temperature changes FMCXO outputs: 10 MHz, 5 MHz, 1 MHz user-selectable by external digital control FM1 output 1 Hz Code FT 28 ≤ ± 2 x 10-8 from -30°C to +85°C Code AY 17 ≤ ± 1 x 10-7 from -55°C to +125°C short-term stability Nominal frequency settability (see below) at + 25°C attained for 1.4 V 1% on pin 18 2x10-8 / 1s. and 2x10-8 / 10s long-term stability 1x10-9 / day and 1x10-8 / month frequency stability vs. supply voltage vs. load ± 1.10-9 ( 5V ± 5% ) ± 1.10-9 (between 1 LSTTL gate and 2 LSTTL gates) supply voltage 3.25 V ≤ Vcc ≤ 6 V supply current Start-up ≤ 8 mA normal operation mode : ≤ 6 mA stand-by mode : ≤ 4 mA output levels ″0″ ≤ 0.4 V and ″1″ ≥ 2.4 V output current FMCXO ≥ ± 0.5 mA rise / fall time ≤ 20 ns between 20 % and 80 % of the actual output level, at +25°C ± 2°C duty cycle 50 / 50 ± 5% at Vcc/2 frequency adjustment on 10 MHz ≥ ± 5x 10-6 through RS232 (settability to 4.10-9) ≥ ± 1x 10-6 with a 47 kΩ potentiometer connected between pin 18 and GND or with control voltage 0.5V to 2.8V on pin 18 (slope 1 x 10-6 / V) Delay between adjustment and corresponding change of FMCXO : ≤ 500s to 4.10-9 or ≤ 10 s to 1.10-7 secondary functions see next page shock test vibration test (sinewave) vibration test (random) MIL STD 202F, method 213B, condition l : 3 x 3 shocks 100 g, sawtooth, 6 ms MIL STD 202F, method 204D, condition D : 10 Hz to 2 kHz / 10g / 3 axes on request package marking n° 77 QEM 77-AH + CQE + date code + serial number Calibration precision SALES OFFICES: Benelux: +33 (0) 1 46 90 23 00 / Germany: +49 (0) 89 820 796-27/ Nordic: +46 (0) 8 59030300 France: +33 (0) 1 46 90 23 00 / Italy: +39 (0) 738 8869 / Spain: +33 (0) 1 46 90 23 00 / UK: +44 (0) 1256 883340 USA: +1 (623) 780-1995 / Asia-Pacific : +33 (0) 5 56 46 66 84 WEB SITE: http://www.temex-components.com Specifications are subject to change without notice - Page 2 / 7 QEM77AH 04-05-2001 QEM77-AH 41 x 41 mm / 19 pins MCXO Operating Procedure TEMEX TIME & FREQUENCY Secundary functions Output frequency selection (FMCXO) Logic levels on dedicated inputs Byte value on pin 13 RS232 port Action delay PD1= ″0″ and PD2 = ″0″ $EF FMCXO = 10 MHz PD1= ″1″ and PD2 = ″0″ $EF FMCXO = 5MHz Result PD1= ″0″ and PD2 = ″1″ $FD 300 ms FMCXO = 1MHz PD1= ″1″ and PD2 = ″1″ Synchronization of FM1 on FM2 PD5 = ″1″ $FC synch enable PD5= ″0″ $CF synch disable Switching between normal and PD6 = ″1″ $CA 1s disable stand-by modes PD6= ″0″ $AC 4s enable Phase measurement PD7 = ″0″ n.a. 1s disable ∆φ(FM1, FM2) PD7 = ″1″ n.a. 1s enable $BF increases FMCXO by 1 ppm $FB decreases FMCXO by 1ppm $AB+3 bytes Digital frequency adjustment through RS232 port (see next page) 300 ms acquisition time $BA+3 bytes $BC+3 bytes $CB+3 bytes $BD $BB increases FMCXO proportionally to the 3 bytes following $AB decreases FMCXO proportionally to the 3 bytes following $BA adds a positive frequency offset to FMCXO proportional to the 3 bytes following $BC adds a negative frequency offset to FMCXO proportional to the 3 bytes following $CB cancels every software change, except those performed by $BC or $CB returns FMCXO to factory setting Important notice : It is recommended that any action initiated through a dedicated input modified or cancelled by an other action on a dedicated input. The same is true for commands issued on the RS232 port. SALES OFFICES: Benelux: +33 (0) 1 46 90 23 00 / Germany: +49 (0) 89 820 796-27/ Nordic: +46 (0) 8 59030300 France: +33 (0) 1 46 90 23 00 / Italy: +39 (0) 738 8869 / Spain: +33 (0) 1 46 90 23 00 / UK: +44 (0) 1256 883340 USA: +1 (623) 780-1995 / Asia-Pacific : +33 (0) 5 56 46 66 84 WEB SITE: http://www.temex-components.com Specifications are subject to change without notice - Page 3 / 7 QEM77AH 04-05-2001 QEM77-AH 41 x 41 mm / 19 pins TEMEX TIME & FREQUENCY MCXO Operating Procedure Synchronization of FM The 1 Hz frequency output on FM1 is derived by division of the 10 MHz FMCXO, it has therefore the same relative stability. In order to provide the function of a 1 pps generator in time keeping applications, the FM1 output can be synchronized with an external 1 Hz source. In this case, the synchronization is effected between two positive-going edges of the compared signals after applying the synchronization validation signal. The maximum error between the two signals is ± 1µs. (Warning ! Synchronization is not possible when the oscillator is in stand-by mode). After synchronization and switching to stand-by mode, an additional error inferior to ± 50 µs is introduced. Synchronization on PDS by rising front. Phase measurement This function provides the means to measure the difference between rising fronts at 1 Hz on FM1 and FM2 with a precision of ± 1 % or ± 1µs (whichever is the greater). During phase measurement, temperature compensation of the frequency cannot be effected. It is therefore important that the temperature remains constant. The result of this measurement is given by the RS232 link in the form of 3 bytes, the first of which is the most significant. The phase-offset value on 10 MHz is given by ϕ offset (µs) = decimal value of the 3 bytes. Stand-by mode (reduced power consumption) In stand-by mode, the temperature compensation intervals are increased. This means the frequency precision is attained after a longer stabilization time. In this mode, only the 1 Hz-output is available. The dividing stages and certain other functions are switched-off, thereby reducing the consumption to 4 mA. RS232 Port Communication parameters Format : NRZ Speed : 2400 bits/s. 1 start bit/1 stop bit/8 data bits no parity logic levels : HCMOS 3 V N.B. : the pin-outs 1, 3, 8, 17, 19 are used for initial setting during manufacture. They must not be connected, any connection can either cause malfunctioning or cause permanent damage. Digital frequency adjustment Adjustments effected by means of the RS 232 port differ in their hierarchy : $BF, $FB, $AB, $BA, change temporarily the FMCXO and can be cancelled by $BD or by $BB. Factory setting while $BB returns FMCXO to its original value. Inputting $BC or $CB superimposes an additional frequency offset that can only be cancelled by $BB. Amplitude of the frequency adjustment is limited to ± 100 Hz Computing the 3 correcting bytes (low, medium, high) : value in Hex = Hex(Int(26.948 x ∆F(Hz))) SALES OFFICES: Benelux: +33 (0) 1 46 90 23 00 / Germany: +49 (0) 89 820 796-27/ Nordic: +46 (0) 8 59030300 France: +33 (0) 1 46 90 23 00 / Italy: +39 (0) 738 8869 / Spain: +33 (0) 1 46 90 23 00 / UK: +44 (0) 1256 883340 USA: +1 (623) 780-1995 / Asia-Pacific : +33 (0) 5 56 46 66 84 WEB SITE: http://www.temex-components.com Specifications are subject to change without notice - Page 4 / 7 QEM77AH 04-05-2001 QEM77-AH 41 x 41 mm / 19 pins MCXO Operating Procedure TEMEX TIME & FREQUENCY example : ∆F = 35 Hz gives $AF $03 $00 for 10 MHz for other frequency 1ppm = 270 (decimal) = $1E$01$00 Pin function Pin # Symbol Typical signal Maximum absolute rating n.a. LS-TTL-compatible ″0″ ≤ 0.4 V ″1″ ≥ 2.4 V n.a. sink/source 0.5 mA/10 pF ″0″ ≤ -0.5 V ″1″ ≥ 3.2 V n.a. LS-TTL-compatible ″0″ ≤ 0.4 V ″1″ ≥ 2.4 V n.a. sink/source 0.5 mA/10 pF ″0″ ≤ -0.5 V ″1″ ≥ 3.2 V HCMOS 3 V -0.5 V < Vin < 6 V n.a. n.a. HCMOS 3 V -0.5 V < Vin < 6 V reserved for initial setting, don’t connect 1 FDDSI 1 Hz output 2 FM1 reserved for initial setting, don’t connect 3 VPP6 1 MHz, 5 MHz or 10 MHz frequency output 4 FMCXO 1 Hz reference signal input 5 FM2 6 PD1 7 PD2 reserved for initial setting, don’t connect 8 PD4 1 Hz synch enable / disable 9 PD5 stand-by / normal mode 10 PD6 φ-measurement enable/disable 11 PD7 power supply 12 VP RS 232 input 13 RDI RS 232 output 14 TDO GND 15 GND 0V n.a. reserved for initial setting, don’t connect 16 RESET n.a. n.a. 17 PC7 frequency adjustment (analogue) 18 CTRL 0.5 V < VCTRL< 2.8 V 0 V < VCTRL< 3.5 V reserved for initial setting, don’t connect 19 IRQ n.a. n.a. output frequency programming inputs +3.2 V < Vin <+6 V HCMOS 3 V -0.5 V < Vjn< +6 V -0.5 V < Vout< +3 V Important notice : The pins reserved for initial setting must not be connected. Any connection could cause malfunctioning or even permanent damage. SALES OFFICES: Benelux: +33 (0) 1 46 90 23 00 / Germany: +49 (0) 89 820 796-27/ Nordic: +46 (0) 8 59030300 France: +33 (0) 1 46 90 23 00 / Italy: +39 (0) 738 8869 / Spain: +33 (0) 1 46 90 23 00 / UK: +44 (0) 1256 883340 USA: +1 (623) 780-1995 / Asia-Pacific : +33 (0) 5 56 46 66 84 WEB SITE: http://www.temex-components.com Specifications are subject to change without notice - Page 5 / 7 QEM77AH 04-05-2001 QEM77-AH 41 x 41 mm / 19 pins TEMEX TIME & FREQUENCY MCXO Operating Procedure Package ( h = 11.5 mm) SALES OFFICES: Benelux: +33 (0) 1 46 90 23 00 / Germany: +49 (0) 89 820 796-27/ Nordic: +46 (0) 8 59030300 France: +33 (0) 1 46 90 23 00 / Italy: +39 (0) 738 8869 / Spain: +33 (0) 1 46 90 23 00 / UK: +44 (0) 1256 883340 USA: +1 (623) 780-1995 / Asia-Pacific : +33 (0) 5 56 46 66 84 WEB SITE: http://www.temex-components.com Specifications are subject to change without notice - Page 6 / 7 QEM77AH 04-05-2001 QEM77-AH 41 x 41 mm / 19 pins MCXO Operating Procedure TEMEX TIME & FREQUENCY See note 1 See note 1 Note 1: Screws are optional. Please contact us for further details (including length of the screws) SALES OFFICES: Benelux: +33 (0) 1 46 90 23 00 / Germany: +49 (0) 89 820 796-27/ Nordic: +46 (0) 8 59030300 France: +33 (0) 1 46 90 23 00 / Italy: +39 (0) 738 8869 / Spain: +33 (0) 1 46 90 23 00 / UK: +44 (0) 1256 883340 USA: +1 (623) 780-1995 / Asia-Pacific : +33 (0) 5 56 46 66 84 WEB SITE: http://www.temex-components.com Specifications are subject to change without notice - Page 7 / 7