product information cml semiconductor products fx365a ctcss encoder/decoder publication no. d/365a/f/2 feb 1992 advance information features improved audio and noise performance 39 programmable sub-audio tones + n otone sub-audio frequency range 67.0hz to 250.3hz reduced current requirement in rx monitoring mode pin and function compatible with fx365 microcircuits high voiceband/ctcss isolation -70 100 200 300 400 500 600 700 800 900 1000 -60 -50 -40 -30 -20 -10 0 frequency (hz) gain (db) voiceband frequencies ctcss frequencies -33 250.3 fx365a voiceband filter response brief description the fx365a is a half-duplex m processor controlled ctcss encoder and decoder with integral voice-band filtering. this device which is pin and function compatible with standard fx365 microcircuits is also available in a 24pin plastic small outline (s.o.i.c.) [365a dw] smd package. the fx365a demonstrates improved voice- band noise performance and requires less supply current in the rx monitoring mode. the fx365a has the capability of encoding and decoding 39 separate sub-audio tones, 38 of which are detailed in the current fx365 data sheet, plus an additional tone of 69.3hz. this data sheet, which details the differences between the fx365a and the fx365 microcircuits, should be used with the current fx365 data sheet. programmable sub-audio rx and tx frequencies (hz) 67.0 69.3 71.9 74.4 77.0 79.7 82.5 85.4 88.5 91.5 94.8 97.4 100.0 103.5 107.2 110.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4 156.7 162.2 167.9 173.8 179.9 186.2 192.8 203.5 210.7 218.1 225.7 233.6 241.8 250.3 n otone fx365a tx and rx sub-audio frequencies 69.3hz tone generation the additional sub-audio tone provided by the fx365a is 69.3hz. with reference to the fx365 data sheet C table 3, the programming information is as follows: nominal d 0 d 1 d 2 d 3 d 4 d 5 freq. (hz) 69.3 100111
specification absolute maximum ratings exceeding the maximum rating can result in device damage. operation of the device outside the operating limits is not implied. supply voltage -0.3 to 7.0v input voltage at any pin (ref v ss = 0v) -0.3 to (v dd + 0.3v) sink/source current (supply pins) +/- 30ma (other pins) +/- 20ma total device dissipation @ t amb 25 c 800mw max. derating 10mw/ c operating temperature range: fx365a j -40 c to +85 c (cerdip) fx365a dw/lg/ls -40 c to +85 c (plastic) storage temperature range: fx365a j -55 c to +125 c (cerdip) fx365a dw/lg/ls -40 c to +85 c (plastic) operating limits all device characteristics are measured under the following conditions unless otherwise specified: v dd = 5.0v. t amb = 25 c. xtal/clock f 0 = 1.0mhz. audio level 0db ref: = 300mv rms composite signal content = 1.0khz tone at 0db, noise at -12db (gaussian white noise band-limited to 6.0khz), programmed ctcss tone at -20db. characteristics see note min. typ. max. unit static values supply voltage 4.5 5.0 5.5 v supply current (tx) C 3.5 C ma (rx) C 3.5 C ma (rx monitor) 1 C 2.5 C ma audio filter passband frequencies 300 3000 hz passband gain at 1.0khz C 0 C db w.r.t. 1.0khz -2.0 C 0.5 db stopband frequencies C C 250 hz attenuation 33.0 36.0 - db output noise (a.c. short circuit) 2 C -54.0 -48.0 db sinad 3 36.0 40.0 C db tx output impedance C 2.0 C k w tx output amplitude C 950 C mvrms spurious emissions C C -48.0 db notes 1 see fx365 data sheet table 2. 2. measured in a 30khz bandwidth. 3. with an input level of 308mvrms at 1.0khz, in a 30khz bandwidth. consumer microcircuits limited 1992 consumer microcircuits limited telephone: (0376) 513833 telex: 99382 cmicro g telefax (0376) 518247 1 wheaton road witham - essex cm8 3td - england ordering information fx365a dw 24-pin surface mount s.o.i.c. fx365a j 24-pin cerdip dil fx365a lg 24-pin quad plastic encapsulated bent and cropped fx365a ls 24-lead plastic leaded chip carrier h j l pin 1 a b c k d f e g m n alternative pin location marking cml does not assume any responsibility for the use of any circuitry described. no circuit patent licences are implied and cml reserves the right at any time without notice to change the said circuitry. dimension min typ max a 15.16 15.60 b 7.39 7.59 c 2.21 2.67 d 0.20 e 0.40 f 1.27 g 0.66 h 10.11 10.51 j 0.63 k 45 l 5 m 0.25 n 0.76 fx365a dw s.o.i.c. package
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