3.3 v, single channel rs-232 line driver/receiver preliminary technical data ADM3101E rev. prd information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent ri ghts of analog devices. trademarks and registered trademarks are the prop erty of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.326.8703 ? 2006 analog devices, inc. all rights reserved. features 460 kbps data rate 1 tx and 1 rx meets eia-232e specifications 0.1 f charge pump capacitors esd protection to iec1000-4-2 (801.2) on cmos and rs-232 i/os 8 kv: contact discharge 15 kv: air gap discharge applications general-purpose rs-232 data link portable instruments handsets industrial/telecom diagonictics ports general description the ADM3101E transceiver is a high speed, single-channel rs- 232/v.28 interface devices that operate from a single 3.3 v power supply. low power consumption make it ideal for battery-powered portable instruments. the ADM3101E conforms to the eia-232e and ccitt v.28 specifications and operates at data rates up to 460 kbps. all rs-232 (t out and r in ) and cmos (t in and r out ) inputs and outputs are protected against electrostatic discharges (up to 15 kv esd protection). this ensures compliance with iec 1000-4-2 requirements. this device is ideally suited for operation in electrically harsh environments or where rs-232 cables are frequently being plugged/unplugged with the 15kv esd protection of the ADM3101Es i/o pins. emissions are also controlled to within very strict limits. cmos technology is used to keep the power dissipation to an absolute minimum, allowing maximum battery life in portable applications. four external 0.1 f charge pump capacitors are used for the voltage doubler/inverter permitting operation from a single 3.3 v supply. the ADM3101E is available in a 12-lead lfcsp. functional block diagrams c1+ c1- c2+ c2- vcc v+ v- t out r in t in r out ADM3101E gnd +3.3v to +6.6v voltage doubler +6.6v to -6.6v voltage inverter cmos input cmos output eia/tia-232 output eia/tia-232 input* * internal 5k ? pull-down resistor on the rs-232 input t1 r1 0.1f 10v 0.1f 10v c3 0.1f 6.3v c5 0.1f c4 0.1f 10v + + + + + +3.3v input figure 1. ADM3101E functional block diagram 4 .com u datasheet
ADM3101E preliminary technical data rev. prd | page 2 of 10 table of contents specifications..................................................................................... 3 absolute maximum ratings............................................................ 4 esd caution.................................................................................. 4 pin configurations and function descriptions ........................... 5 typical performance characteristics ............................................. 6 general description ......................................................................... 8 circuit description....................................................................... 8 charge pump dc-dc voltage converter ............................ 8 transmitter (driver) section .................................................. 8 receiver section ........................................................................8 cmos input voltage thresholds ............................................8 esd protection on rs-232 and cmos i/o pins ..................9 high baud rate..............................................................................9 outline dimensions ....................................................................... 10 ordering guide .......................................................................... 10 revision history 4 .com u datasheet
preliminary technical data ADM3101E rev. prd | page 3 of 10 specifications v cc = 3.3 v 0.3 v, c1?c4 = 0.1 f. all specifications t min to t max , unless otherwise noted. table 1. parameter min typ max unit test conditions/comments dc characteristics operating voltage range 3.0 3.3 5.5 v v cc power supply current 1.0 2 ma no load 3 5 ma r l = 3 k to gnd logic input logic threshold low, v inl 0.6 v t in input logic threshold high, v inh 1.4 v t in input logic threshold low, v inl 0.8 v t in , v cc = 5.0v 0.5v input logic threshold high, v inh 2.0 v t in , v cc = 5.0v 0.5v cmos output voltage low, v ol 0.4 v i out = 1.6 ma cmos output voltage high, v oh v cc ? 0.6 v i out = ? 1 ma logic pull-up current 5 10 a t in = gnd to v cc rs-232 receiver eia-232 input voltage range ?30 +30 v guaranteed by design eia-232 input threshold low 0.6 1.2 v v cc = 3.0v to 5.5v eia-232 input threshold high 1.6 2.4 v eia-232 input threshold high tbd 3.0 v v cc = 5.0v 0.5v eia-232 input hysteresis 0.4 v eia-232 input resistance 3 5 7 k rs-232 transmitter output voltage swing (rs-232) 5.0 5.2 v v cc = 3.3v to 5.5v. all transmitter outputs loaded with 3 k to ground. output voltage swing (rs-562) tbd v v cc = 3.0 v transmitter output resistance 300 v cc = 0 v, v out = 2 v rs-232 output short circuit current 15 ma timing characteristics maximum data rate 460 kbps v cc = 3.3 v, r l = 3 k to 7 k, c l = 50 pf to 1000 pf. receiver propagation delay tphl 0.4 s tplh 0.4 s transmitter propagation delay 300 s r l = 3 k, c l = 1000 pf receiver output enable time 200 ns receiver output disable time 200 ns transmitter skew 30 ns receiver skew 300 ns transition region slew ra te 5.5 10 30 v/s guaranteed by design from +3 v to ?3 v or ? 3 v to +3 v, v cc = +3.3 v, r l = 3 k, c l = 1000 pf, t a = 25c esd protection (rs-232 and cmos i/o pins) 15 kv human body model 15 kv iec 1000-4-2 air discharge 8 kv iec 1000-4-2 air discharge 4 .com u datasheet
ADM3101E preliminary technical data rev. prd | page 4 of 10 absolute maximum ratings t a = 25c, unless otherwise noted. table 2. paraeter atin .3 to .3 to .3 to nput oltaes t .3 to .3 3 utput oltaes t t t .3 to .3 ort ircuit duration t t ontinuous poer dissipation poer dissipation p2 td derate aboe teral peance . peratin teperature ane nustrial ersion to torae teperature ane to eafree teperature olerin s 2 tis is a stress ratin onl unctional operation o te eice at tese or an oter conitions aboe tose inicate in te operation sections o tis speciication is not iplie. posure to absolute aiu ratin conitions or etene perios o tie a aect reliabilit. d t d electrostatic iscare sensitie eice. lectros tatic cares as i as reail accuulate on te uan bo an test euipent an can iscare i tout etection. ltou tis prouct eatures proprietar d protection circuitr peranent aa e a occur on eices subecte to i ener electrostatic iscares. tereore proper d precautions are recoene to aoi perorance eraation or loss o unctionalit. 4 .com u datasheet
preliminary technical data ADM3101E rev. prd | page 5 of 10 pin configurations and function descriptions 7 8 9 1 2 3 45 6 10 11 ADM3101E top view (not to scale) 12 v- figure 2. ADM3101E pin configuration table 3. pin function descriptions neonic function poer uppl nput. 3. to . . nternall enerate po sitie uppl oinal. nternall enerate e atie uppl oinal. d roun pin. ust be connecte to . ternal apacitor is connecte beteen tese pins. . f capacitor is recoene but la rer capacitors up to f a be use. 2 2 ternal apacitor 2 is connecte beteen tese pins. . f capacitor is recoene but la rer capacitors up to f a be use. t transitter drier nput. t is input accepts tt leels. t t transitter drier utput. tis outputs 232 sinal leels tpicall . eceier nput. tis input accepts 232 sinal leels. n internal pullon resistor to d is connecte on te input . t eceier utput. tis outp uts output loic leels. 4 .com u datasheet
ADM3101E preliminary technical data rev. prd | page 6 of 10 typical performance characteristics figure 3. transmitter output voltage high/low vs. load capacitance @ 460 kbps figure 4. transmitter output voltage vs. v cc, rl = 3k figure 5. transmitter output voltage low/high vs. load figure 6. charge pump v+, v? vs. load current figure 7. charge pump impedance vs. v cc figure 8. power supply current vs. load capacitance 4 .com u datasheet
preliminary technical data ADM3101E rev. prd | page 7 of 10 figure 9. 460 kbps data transmission figure 10. t in voltage threshold vs. vcc 4 .com u datasheet
ADM3101E preliminary technical data rev. prd | page 8 of 10 general description the ADM3101E is a single channel rs-232 line driver/receiver. step-up voltage converters coupled with level shifting transmitters and receivers allow rs-232 levels to be developed while operating from a single 3.3 v supply. cmos technology is used to keep the power dissipation to an absolute minimum, allowing maximum battery life in portable applications. circuit description the internal circuitry consists of the following main sections: x a charge pump voltage converter x a 3.3 v logic to eia-232 transmitter x a eia-232 to 3.3 v logic receiver charge pump dc-dc voltage converter the charge pump voltage converter consists o a 2 oscillator and a sitching matri the converter generates a v suppl rom the input 33 v level this is done in to stages using a sitched capacitor techniue as illustrated in igure 2 and igure 3 irst the 33 v input suppl is douled to v using capacitor c as the charge storage element the v level is then inverted to generate v using c2 as the storage element c3 is shon connected eteen v and v cc ut is euall eective i connected eteen v and d capacitors c3 and c are used to reduce the output ripple their values are not critical and can e increased i desired capacitor c3 is shon connected eteen v and v cc it is also acceptale to connect this capacitor eteen v and d i desired larger capacitors (up to ) can e used or capacitors cc c c- c2 c2- vcc v v- t ot r i t i r ot dm3e d 33v to v voltage douler v to -v voltage inverter cmos input cmos output ei/ti-232 output ei/ti-232 input internal pull-don resistor on the rs-232 input t r v v c3 3v c c v 33v input igure dm3e tpical operating circuit igure 2 charge pump voltage douler igure 3 charge pump voltage inverter transmitter (driver) section the driver convert the 33 v logic input levels into rs-232 output levels ith v cc 33 v and driving an rs-232 load the output voltage sing is tpicall v the t i pin has internall a ea pull-up hich allos it to e driven an open drain output ut the maimum operating datarate is reduced hen the t i pin is een driven a open drain pin receiver section the receiver is an inverting level-shiters that accept rs-232 input level and translate it into a 33 v logic output level the input has an internal pull-don resistors to ground and is also protected against overvoltages o up to 3 v n unconnected input is pulled to v the internal pull- don resistor this thereore results in a ogic output level or an unconnected input or or an input connected to d the receiver has a schmitt-trigger input ith a hsteresis level o v this ensures error-ree reception or oth a nois input and or an input ith slo transition times cmos input voltage thresholds the dm3e cmos input and output pins (t i and r ot ) are designed to interace ith v logic thresholds hen the dm3es vcc 33v the dm3e cmos input and output pins (t i and r ot ) are designed to interace ith tt/cmos logic thresholds hen the dm3es vcc v 4 .com u datasheet
preliminary technical data ADM3101E rev. prd | page 9 of 10 esd protection on rs-232 and cmos i/o pins ll rs-232 (t ot and r i ) and cmos (t i and r ot ) inputs and outputs are protected against electrostatic discharges (up to v) this ensures compliance ith iec --2 reuirements i d rte the dm3e eatures high sle rates permitting data transmission at rates ell in ecess o the ei/rs-232 speciications the rs-232 voltage levels are maintained at data rates up to ps even under orst case loading conditions hen t i is een driven a push-pull output this allos high speed data lins eteen to terminals or indeed it is suitale or the ne generation isd modem standards that reuires data rates o 23 ps the sle rate is internall controlled to less than 3 v/s to minimie emi intererence 4 .com u datasheet
ADM3101E preliminary technical data rev. prd | page 10 of 10 outline dimensions figure 14. 12-lead frame chip scale package [lfcsp] (cp-12)?dimensions shown in millimeters ordering guide model temperature range package options 1 ADM3101Eacpz 1 ?40c to +85c cp-12 1 z = pb free 2 nalo deices nc. ll rits resere. traears an reistere traears are te prop ert o teir respectie oners. 4 .com u datasheet
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