? ? ? ? ? ? ? RFPT200 ------- the charon is a spi controlled high accuracy tcxo with embedded timer and alarm function. ------- ------- the charon is a high stability 7x5 smd digitally controlled temperature controlled crystal oscillator (dctcxo) designed and specified to bring together the highest stability tcxo performance with digital frequency control, separate low frequency output, timer and alarm functionality. ------- product description ------- serial peripheral interface (spi) controlled high accuracy tcxo with embedded timer and alarm function. using rakons advanced pluto? analogue frequency compensation system, the dctcxo achieves unrivalled frequency stability. a custom asic, charon (plutos moon) has been designed to closely interface with the pluto? asic to provide the extra enhanced functionality in a miniature 7x5 smd package. in addition to market leading stability the charon device features integrated timing and control functions. a low frequency timing pulse is derived from a programmable division ratio of the high stability oscillator. this drives the onboard 32 bit timer, which coupled to a 32 bit programmable comparator and alarm circuitry, enables a system to enter a low power standby mode and be woken at a precise time in the future. all digital control is via a standard 4-wire spi interface. ------- applications military other ------- features 32 bit timer 32 bit comparator with alarm output low frequency timing pulse digital frequency adjustment low power standby mode ------- specifications ----- 1.0 specification references line parameter description 1.1 model description RFPT200 'charon' 1.2 rohs compliant available on request 1.3 package size available 7.0 mm x 5.0 mm x 2.8 mm ----- 2.0 frequency characteristics line parameter test condition value unit 2.1 frequency range frequency range available depends on output type (note 1) 3 to 40 mhz 2.2 frequency calibration at 25c at mid-range of dac, reference nominal frequency 0.5 to 1 ppm 2.3 frequency stability over temperature reference to (fmax+fmin)/2. max 0.15 ppm only available over -20c to 70c (note 2) 0.15 to 2 ppm 2.4 temperature range the operating temperature range over which the frequency stability is measured (note 3) -55 to 95 c 2.5 stability vs. supply voltage changes 5% variation in supply voltage. nominal value 0.1 ppm 0.05 to 0.2 ppm 2.6 stability vs. load changes 10% variation in load. nominal value 0.1 ppm 0.05 to 0.2 ppm 2.7 long term stability at 25c, first year. nominal value 1 ppm 0.5 to 2 ppm 2.8 long term stability at 25c, 10 years predicted, including first year. nominal value 3 ppm 2 to 5 ppm 2.9 drift due to reflow soldering at 25c, at mid-range of dac, 24 hours after reflow. 0.5 to 1 ppm ----- page 1
3.0 power supply line parameter test condition value unit 3.1 supply voltage normally specified as nominal (vcc) 5%. nominal value 3.3v 2.5 to 5.5 v 3.2 supply current 3.3v, load 15pf (min.@ 10mhz, max.@ 40mhz). nominal value 4 ma 2 to 6 ma 3.3 supply current rf output disabled (min.@ 10mhz, max.@ 40mhz). nominal value 1.6 ma 1.4 to 1.8 ma ----- 4.0 hcmos oscillator output line parameter test condition value unit 4.1 output waveform hcmos 4.2 output voltage level low 10 max %vcc 4.3 output voltage level high 90 min %vcc 4.4 rise and fall times 10% to 90% of voh-vol. nominal value 6 ns 4 to 8 ns 4.5 duty cycle measured at 50% vcc 45 to 55 % 4.6 load normally specified at cl10%. nominal value 15 pf 10 to 50 pf ----- 5.0 clipped sinewave oscillator output line parameter test condition value unit 5.1 output waveform clipped sinewave (dc coupled) 5.2 output voltage level peak to peak voltage measured at minimum supply voltage 0.8 v 5.3 output load resistance operating range 9 to 11 k 5.4 output load capacitance operating range 9 to 11 pf ----- 6.0 rf output tristate control line parameter test condition value unit 6.1 output enabled active high or open circuit 0.6 vcc (100 k internal pull up) 60 min %vcc 6.2 output tristate mode 20 max %vcc 6.3 tri-state control in tri-state mode, the rf output stage is disabled but the oscillator, compensation circuit and digital section are still active. an rf enable signal to stable frequency operation is therefore very rapid ----- 7.0 ssb phase noise line parameter test condition value unit 7.1 ssb phase noise power density at 10hz offset typical at 10mhz -95 dbc/hz 7.2 ssb phase noise power density at 100khz offset typical at 10mhz -145 dbc/hz ----- 8.0 lf timing pulse: pulse width line parameter test condition value unit 8.1 lf pulse width ripple counter setting. user programmable register. divider ratio at power up: 64 4 to 64 divider ratio 8.2 lf pulse width lf timing pulse width = oscillator period * ripple 0.1 to 6.4 s ----- page 2
9.0 lf timing pulse: pulse period line parameter test condition value unit 9.1 lf pulse period sync counter setting. user programmable register. sync ratio at power up: 4096 2 to 4096 sync. ratio 9.2 lf pulse period lf timing pulse period = oscillator period * ripple * sync 0.2 to 26214.4 s ----- 10.0 lf timing pulse: enable setting line parameter test condition value unit 10.1 lf output off spi or bonded in paralled to rf enable 0 10.2 lf output on spi or bonded in paralled to rf enable 1 ----- 11.0 counter line parameter test condition value unit 11.1 32 bit timer continuous count of lf, reset on power up, read via spi default: 0. maximum: 232-1 lf counts 11.2 32 bit min. rollover period (232-1) x lf period 859 min sec 11.3 32 bit max. rollover period (232-1) x lf period 1303 max day ----- 12.0 alarm line parameter test condition value unit 12.1 32 bit match set via spi which also resets alarm output when set. user programmable register. default: 0. maximum: 232-1 12.2 alarm dedicated output alarm latched when match detector matches timer. power up default: 1 (note 4) 0 to 1 alarm high ----- 13.0 frequency characteristics (dac) line parameter test condition value unit 13.1 frequency min. shift at 0 - relative to dac 128 -5 to -10 ppm 13.2 frequency nominal shift at 0 - relative to dac 128 -7 to -15 ppm 13.3 frequency max. shift at 0 - relative to dac 128 -10 to -20 ppm 13.4 frequency min. shift at 255 - relative to dac 128 5 to 10 ppm 13.5 frequency nominal shift at 255 - relative to dac 128 7 to 15 ppm 13.6 frequency max. shift at 255 - relative to dac 128 10 to 20 ppm 13.7 frequency change per bit frequency (dac 255 C dac 0) / 256 nominal value 0.08 ppm 0.04 to 0.2 ppm ----- 14.0 standard 4 wire spi interface (cpol 0, cpha 0 mode) line parameter description 14.1 diagram refer to standard 4 wire spi interface diagram 14.2 digital control and lf output digital control specification available on request ----- 15.0 marking line parameter description 15.1 type laser marked 15.2 line 1 r and manufacturing identifier (x yw) (see model drawing) 15.3 line 2 pad 1 / static sensitivity identifier (), abbreviated part number (0000), device date code (yw) (see model drawing) ----- page 3
16.0 pin connections line parameter description 16.1 pin 1 spi-clk (sclk) 16.2 pin 2 spi-in (sdi) 16.3 pin 3 spi-out (sdo) 16.4 pin 4 gnd 16.5 pin 5 +vs* 16.6 pin 6 rf out 16.7 pin 7 alarm 16.8 pin 8 lf out 16.9 pin 9 rf & lf enable 16.10 pin 10 supply, +vs 16.11 pin 11 dac_out/vcxo* 16.12 pin 12 spi-en (ss enable low) 16.13 note * = no connection required, monitor points used during manufacture ----- 17.0 environmental line parameter description 17.1 shock iec 60068-2-27 test ea, 1500g,0.5ms, half-sine, 18 shocks total 17.2 vibration iec 60068-2-6 test fc,20gn,55-2000hz,4 hours per axis (12 hours total) 17.3 storage temperature -55 c to +125 c ----- 18.0 manufacturing information line parameter description 18.1 solderability mil-std-202, method 208, category 3 18.2 reflow solder reflow processes as per attached profile. when soldering, ensure solder does not short top and bottom castellations 18.3 materials part will not contain components with 'pure tin' terminations- part is assembled with lead- bearing solder. termination finish: au (0.5 to 1.27m) over ni (1.27 to 8.89m) over tungsten on an alumina substrate ----- 19.0 specification notes line parameter description 19.1 1 frequency range available dependant on output type. available in hcmos output (3-40mhz) and clipped sinewave output (10-40mhz) 19.2 2 -20c to 70c ref. (fmax +fmin)/2. 0.15 ppm min; 0.3 ppm nominal; 0.5 ppm max -40c to 85c ref. (fmax +fmin)/2. 0.2 ppm min; 0.5 ppm nominal; 1.0 ppm max -55c to 95c ref. (fmax +fmin)/2. 0.5 ppm min; 1.0 ppm nominal; 2.0 ppm max 19.3 3 stability / temperature range options other than listed man be available upon request. please consult sales office for a availability 19.4 4 for example the alarm can be set for periods of up to 50 days with 1ms resolution and with sub 1s accuracy ------- page 4
drawing name: RFPT200 model drawing page 5
drawing name: RFPT200 4 wire spi timing diagram page 6
drawing name: RFPT200 series reflow profile page 7
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