ct266 universal vco/buffer for ct0 designs approved product international microcircuits,inc. 5/17/2000 525 los coches st., milpitas, 95035 408-263-6300, fax 408-263-6571 rev. 2.0 http:/www.imicorp.com page 1 of 6 features ? wide range vco (>70 mhz) for all ct0 designs ? highly efficient on-chip buffer amplifier ? real standby vco with zero chip current consumption ? transmit power cut-off for out-of-lock condition ? 2.0v to 5v working voltage supply ? low current consumption ? excellent frequency stability vs. vdd. ? 8 pin narrow soic package applications this versatile vco circuit with buffer chip can be used in general pll frequency synthesizer applications such as: cordless phone, catv, am/fm radio, tv tuning, satellite receiver, and other telecommunication designs. product description the imict266 is extremely versatile for worldwide ct-0 cordless phone applications in matching all present associated pll frequency synthesizer product designs. the vco circuit provides a very easy way to build the particular high quality vco (see application figure 2). the on-chip highly efficient buffer amplifier will provide enough power to antenna or final power amplifier. this output is normally connected with a fixed low pass filter to remove unwanted harmonics. the vco stand-by function stops all power consumption of the chip and buffer amplifier transmit power cut-off feature provides design choice to lock detection for monitoring transmitted power at out-of-lock condition of phase-locked loop (pll) frequency synthesizer. this chip is designed at imi using special cmos processing technology that provides wide working supply voltage and low current consumption advantages.
ct266 universal vco/buffer for ct0 designs approved product international microcircuits,inc. 5/17/2000 525 los coches st., milpitas, 95035 408-263-6300, fax 408-263-6571 rev. 2.0 http:/www.imicorp.com page 2 of 6 figure 1. block diagram ordering information part number package type production flow IMICT266DZB 8 pin narrow soic (150 mil) industrial -40oc to + 85o c marking: example: imi ct266dz date code lot # IMICT266DZB flow industrial C 40 c to + 85 c package z = narrow soic (150 mil) revision imi device number high efficiency amplifier vco circuit stp sb vcoin vcout vdd vdd 8 3 4 5 1 6 2 fout 7 vss
ct266 universal vco/buffer for ct0 designs approved product international microcircuits,inc. 5/17/2000 525 los coches st., milpitas, 95035 408-263-6300, fax 408-263-6571 rev. 2.0 http:/www.imicorp.com page 3 of 6 figure 2. narrow soic package pin assignment pin descriptions pin # pin name description 2 fout this is a highly efficient output buffer of the vco. normally, it can be directly connected to a filter network for antenna matchin g purposes and to also reduce unwanted harmonics. see output power versus power supply voltage on figure 3. 3 sb the standby pin is used to save power consumption when not usin g transmit si g nal output power. when it is low, the vco is disabled, the chip has zero power consumption. this pin has an internal pull-down. 4 5 vcoin vcout these are input and output of the vco. they are typically connected to a varactor and respective lc network to provide a tuned vco circuit that operates between 46/49 mhz. see figure 4 for circuit details. 7 vss circuit ground pin. 1 vdd positive power supply pins (2.0v~5v). 6vdd 8 stp transmit power cut-off control pin. when it is high, transmit power is in standby. it can be controlled by lock detection (ld) of pll frequency synthesizer to monitor transmit power of a out-of-lock condition. it has an internal pull-down resistor. 1 2 3 4 8 7 6 5 vdd fout sb vcoin stp vss vdd vcout
ct266 universal vco/buffer for ct0 designs approved product international microcircuits,inc. 5/17/2000 525 los coches st., milpitas, 95035 408-263-6300, fax 408-263-6571 rev. 2.0 http:/www.imicorp.com page 4 of 6 absolute maximum ratings this device contains circuitry to protect the inputs against damage due to high static voltages or electric field; however, precaution should be taken to avoid application for any voltage higher than the maximum rated voltages to this circuit. for proper operation, vin and vout should be constrained to the range: vss<(vin or vout) ct266 universal vco/buffer for ct0 designs approved product international microcircuits,inc. 5/17/2000 525 los coches st., milpitas, 95035 408-263-6300, fax 408-263-6571 rev. 2.0 http:/www.imicorp.com page 5 of 6 vdd = 3 volts -40oc 0oc 25oc 85oc characteristics symbol min max min max min typ max min max unit conditions pin cin - 10 - 6 10 - 10 pf dynamic capacitance cout - 10 - 6 10 - 10 pf input vil - 0.9 - 1.35 0.9 - 0.9 vdc voltages vih 2.1 - 2.1 1.65 - 2.1 - output vol - 0.05 - 0.05 - 0.0 0.05 - 0.05 vdc voltages voh 2.95 - 2.95 - 2.95 3.0 - 2.95 - iol logic 1.6 - 1.4 2.0 - 0.8 - output oscout 0.8 - 0.7 1.0 - 0.4 - ma vol = 0.30 current ioh logic -1.6 - -1.4 -2.0 - -0.8 - ma voh = 2.4 oscout -0.8 - -0.7 -1.0 - -0.4 - ma voh = 2.4 supply idd ma fosc=fin= 10 mhz currents isb - 150 - 40 150 - 150 a fosc=fin=0 static ipu 30 a vil = 0 application figures 15 10 5 1 2.0 2.5 3.0 3.5 4.0 4.5 5.0 figure 3. transmit power versus supply voltage p o (mw @ r l = 50 ohm) vdd(v) 1mw 2.5mw 4.0mw 7.0mw 9.5mw 13mw 16mw
ct266 universal vco/buffer for ct0 designs approved product international microcircuits,inc. 5/17/2000 525 los coches st., milpitas, 95035 408-263-6300, fax 408-263-6571 rev. 2.0 http:/www.imicorp.com page 6 of 6 application figures (cont.) antenna 820nh 47 27 27 vdd fout sb stp vss vdd standby ld vdd 10uf imict266 vcoin vcout 10k pd mmbv109 100k 1000 680nh 27 39 figure 4. 46/49mhz vco design example package drawing and dimensions 8-pin narrow soic outline dimensions inches millimeters symbol min nom max min nom max a .061 .064 .068 1.55 1.63 1.73 a 1 .004 .006 .0098 0.127 0.15 0.25 a 2 .055 .058 .061 1.40 1.47 1.55 b 0.138 .016 .0192 0.35 0.41 0.49 c .0075 .008 .0098 0.19 0.20 0.25 d .189 .194 .196 4.80 4.93 4.98 e .150 .155 .157 3.81 3.94 3.99 e .050 bsc 1.27 bsc h .230 .236 .244 5.84 5.99 6.20 l .016 .025 .035 0.41 0.64 0.89 a 0 5 8 0 5 8 disclaimer international microcircuits, inc, reserves the right to change or modify the information contained in this data sheet, without notice. international microcircuits, inc., does not assume any liability arising out of the application or use of any product or circuit described herein. international microcircuits, inc., does not convey any license under its patent rights nor the rights of others. international microcircuits, inc. does not authorize its products for use as critical components in life-support systems or critical medical instruments, where a malfunction or failure may reasonably be expected to result in significant injury to the user. d a a2 a1 b e e h a l c narrow soic package (150 mil)
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