cml semiconductor products product information fx20 3 selcall tone codec with microprocessor interface features/applications 0 0 0 single-chip selcall codec 0 ccir, eea or zvei/szvei 0 versions 0 on-chip general purpose timer separate general purpose . 4-bit input/2-bit output port 0 publication d/203/ 3 november 1998 provisional issue mobile or handheld selcall 4-bit microprocessor i/o data port powersave facility uses low-cost 4mhz xtal low-power 5v cmos process i -7g. 1 internal block diagram FX203 brief description the FX203 is a single-chip ?n? tone selective call encoder-decoder peripheral intended for use with a host microprocessor. the device is available i n 3 toneset formats, ccir, eea or zveiiszvei. - _ a 4-bitdata i/o bus, 2-bit address, cs, r/w and irq lines are provided for connection to the microprocessor. separate general purpose 4-bit input and 2-bit output ports are available to allow external circuitry access to the microprocessor via this device. functions such as ?ptt,? ?rx squelch,? ?alert bleeps? and ?lamp drivers? could operate through this facility. an on-chip general purpose timer is provided for such functions as rx and t x tone period timing. time periods of between 1 oms and 140ms in 1 oms steps may be programmed via the microprocessor interface. the FX203 reference oscillator utilizes a low- cost 4.0 mhz xtal or externally derived clock. the divide by 4 (1 .o mhz) output may be used to drive the clock circuitry of other devices such as the fx365 ctcss encoder/ decoder, fxo04 voice band inverter, or the fx214 vsb audio scrambler. the FX203 requires a single 5volt supply and utilizes ?chip enable?/?powersave? facilities for reduced current consumption in the standby mode.
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.ov input voltage at any pin (ref v,, = ov) -0.3 to (voo + 0.3v) sink/source current (supply pins) +/- 30ma (other pins) +/- 20ma total device dissipation @ tamb 25c 800mw max. derating 1 omw/?c operating temperature range: FX203j -30c to +85?c (ceramic) FX203lgils -30c to +7o?c (plastic) storage temperature range: FX203j -55c to +i 25jc (ceramic) FX203lgils -40c to +85?c (plastic) operating limits all device characteristics are measured under the following conditions unless otherwise specified: v o o = 5.ov, tams = 25c. xtaklock f , = 4.0 mhz. audio level odb ref: = 775mv rms. characteristics see note min. tvd. max. unit static values supply voltage supply current - rx on, t x and timer disabled rx on, t x enabled, timer running interface levels cpu data port (d, - d3) in/out logic ?1? logic ?0 output logic ?1? source current output logic ?o?sink current three state output leakagesurrent input port (i/p , - i/p,) & (r/w, a,,, a,,s ) logic ?1? logic ?0 output port (o/p, - o/p,), (irq) logic ?1? logic ?0 impedances input port output port audio input audio switch sl ?on? audio switch sl ?off? t x tone output (enabled) t x tone output (disabled) c&k i - 4 output irq output (logic ?1?) irq output (logic ?0?) encoder tone output level tone frequency accuracy ?c tone frequency accuracy ?e tone frequency accuracy ?2 tone output risetime total harmonic distortion 4.5 1 8 3.5 9 10 11 11 11 14 5.0 5.5 v 1.25 ma 3.0 ma 1.5 120 360 4.0 1.0 15.0 1.0 2.0 10.0 1.0 10.0 3.0 25.0 150.0 0 e 2 .0 1.5 1.0 50.0 5:o 10.0 100.0 500.0 +l .o +4.0 +0.3 +0.3 5. 5 v v v v md kr mc kr md kr mr kf2 kq r db hz % % ms %
specification characteristics see note min. typ- max. unit decoder signal input range decode bandwidth - probability > 0.995 ? probability > 0.995 :;, probability > 0.995 ?2 not decode bandwidth - probability < 0.03 ?c probability < 0.03 ?e probability < 0.03 ? noise response rate :;, noise response rate ?e noise response rate ?z decode response time notone to tone tone to notone timing - (figure 3) address set up time read/write set up lime address hold time read/write recovery time chip select access time output hold time (read) data set up time (write) data hold time (write) power up reset time 4 -26.0 6 6 6 7,12 7,12 7,13 5 20 33 t as t flws t ah t rwr t acs t cmr t dsw t dhw ts 50 50 : 0 150 20 3.0 1.0 1.0 1.0 25 +7.0 db % % % +3.0 % +3.0 4 .5 1; digits digits digits t p ms 5 8 ms ns ns ns ns 250 ns 100 ns ns ns ms - address - a,, ai y /-d t ohr $- eatadout (read) 0 3 valid data ;atadin (write) 0 3 fig.3 cpu interface timing diagram notes 1. 2. 3. 4. 5. 6. 7. 6. 9. 10. 11. 12. 13. 14. no t x tone load. sink/source currents $0.1 ma. to 90% of nominal output, (from ?f tone? to ?not-f tone?). sine or square, a.c. coupled input. with minimum tone period (tp) for the tone set, s/n ratio odb. under all conditions of input amplitude and s/n ratio, with maximum tp specified for the tone set. gaussian noise input 6khz band limited with a maximum input level corresponding to l-digit code falsing rate. (random to random single characters). with each data line loaded as: c = 50pf and r =low. v v z;; : ;.:; external?connections on the audio output may alter these values. single digit response in a 40.0-hour period. single digit response in a 1 .o-hour period. an emiter follower output with an internal 1okd pulldown resistor.
|
