1 TC2688 fsk rf transmitter ic general descriptions : TC2688 is a low vhf band (lvb) transmitte r. this device provides two channels for fsk 27mhz application. typical applications for this device includes wireless mouse and keyboard, wireless game pad, rf remote controller and wireless data transmitter etc.. features : operating voltage range : 2.3v ~ 3.6v low deviation for each channel low power consumption in operation almost no power consumption in standby mode quickly oscillated by triggering enable it has 2k~5k data rate package pin description : tricome microwave
2 pin description : number name description 1 d/i data in 2 1/e 1st channel enable 3 vcc supply voltage 4 x1a 1st channel x?tal connection 5 x1b 1st channel x?tal connection 6 cf1 frequency adjustment 7,8,10,11 gnd ground 9 vb bias stabilization 12 2/e 2nd channel enable 13 x2a 2nd channel x?tal connection 14 x2b 2nd channel x?tal connection 15 cf2 frequency adjustment 16 rfo rf output absolute maximum rating : parameters min. max. unit notes storage temperature -40 +85 j operating temperature -15 +60 j lead solder temp. 250 j supply voltage (vcc) 2.3 3.6 v input voltage -0.5 vcc+0.5 v for all input pins output voltage -0.3 vcc+0.3 v esd 2 kv for all input pins electrical characteristics : under the conditions t=25 j vcc=3.0v specifications min. typ. max. unit condition rf frequency 26 27 28 mhz data rate 0.02 2.4 5 kbps output power 3 5 dbm loading=50 ohms tricome microwave
3 deviation 5 6 khz active current 6 7 ma standby current 5 10 ua power supply voltage 2.3 3 3.6 v rf oscillator start time 200 500 us application circuit : ?e single channel part list : parts value notes parts value notes parts value notes c1 tbd adjust ant c7 1000p ceramic cap r2 100k c2 tbd adjust ant c8 68p ceramic cap r3 33 c3 tbd adjust ant c9 1.5p ceramic cap l1 560n c4 tbd adjust ant c10 68p ceramic cap y1 27mhz 27.045mhz c5 150p ceramic cap c11 0.1u ceramic cap c6 82p ceramic cap r1 100k tricome microwave
4 ?e two channels part list : parts value notes parts value notes parts value notes c1 tbd adjust ant c8 68p ceramic cap r1 100k c2 tbd adjust ant c9 1.5p ceramic cap r2 100k c3 tbd adjust ant c10 68p ceramic cap r3 33 c4 tbd adjust ant c11 68p ceramic cap l1 560n c5 150p ceramic cap c12 1.5p ceramic cap y1 27mhz 27.045mhz c6 82p ceramic cap c13 68p ceramic cap y2 27mhz 27.095mhz c7 1000p ceramic cap c14 0.1u ceramic cap tricome microwave
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