rev. 0 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 which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of analog devices. a ADM3202/adm3222/adm1385 one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781/329-4700 world wide web site: http://www.analog.com fax: 781/326-8703 ? analog devices, inc., 1998 low power, +3.3 v, rs-232 line drivers/receivers functional block diagrams features 460 kbps data rate specified at +3.3 v meets eia-232e specifications 0.1 m f charge pump capacitors low power shutdown (adm3222e and adm1385) dip, so, soic, ssop and tssop package options upgrade for max3222/32 and ltc1385 applications general purpose rs-232 data link portable instruments printers palmtop computers pdas general description the ADM3202/adm3222/adm1385 transceivers are high speed, 2-channel rs-232/v.28 interface devices which operate from a single +3.3 v power supply. low power consumption and a shutdown facility (adm3222/ adm1385) makes them ideal for battery powered portable instruments. the ADM3202/adm3222/adm1385 conforms to the eia- 232e and ccitt v.28 specifications and operates at data rates up to 460 kbps. four external 0.1 m f charge pump capacitors are used for the voltage doubler/inverter permitting operation from a single +3.3 v supply. the adm3222 contains additional enable and shutdown cir- cuitry. the en input may be used to three-state the receiver outputs. the sd input is used to power down the charge pump and transmitter outputs reducing the quiescent current to less than 0.5 m a. the receivers remain enabled during shutdown unless disabled using en . the adm1385 contains a driver disable mode and a complete shutdown mode. the ADM3202 is available in a 16-lead dip, narrow and wide soic as well as a space saving 20-lead tssop package. the adm3222 is available in 18-lead dip, so and in 20-lead ssop and tssop. the adm1385 is available in a 20-lead ssop package, which is pin compatible with the ltc1385 cg. +3.3v to +6.6v voltage doubler c1+ c1C c5 0.1 m f + v cc v+ 0.1 m f 10v + + c3 0.1 m f 6.3v +3.3v input +6.6v to C6.6v voltage inverter c2+ c2C + vC 0.1 m f 10v + c4 0.1 m f 10v t1 out t1 in t2 out t2 in eia/tia-232 outputs r1 out r2 out r1 in r2 in eia/tia-232 inputs* cmos inputs cmos outputs ADM3202 gnd *internal 5k v pull-down resistor on each rs-232 input +3.3v to +6.6v voltage doubler c1+ c1C c5 0.1 m f + v cc v+ 0.1 m f 10v + + c3 0.1 m f 6.3v +3.3v input +6.6v to C6.6v voltage inverter c2+ c2C + vC 0.1 m f 10v + c4 0.1 m f 10v t1 out t1 in t2 out t2 in eia/tia-232 outputs r1 out r2 out r1 in r2 in eia/tia-232 inputs* cmos inputs cmos outputs adm3222 gnd *internal 5k v pull-down resistor on each rs-232 input t1 t2 r2 r1 t1 t2 r2 r1 en sd +3.3v to +6.6v voltage doubler c1+ c1C c5 0.1 m f + v cc v+ 0.1 m f 10v + c3 0.1 m f 6.3v +3.3v input +6.6v to C6.6v voltage inverter c2+ c2C + vC 0.1 m f 10v + c4 0.1 m f 10v t1 out t1 in t2 out t2 in eia/tia-232 outputs r1 out r2 out r1 in r2 in eia/tia-232 inputs* cmos inputs cmos outputs adm1385 gnd *internal 5k v pull-down resistor on each rs-232 input t1 t2 r2 r1 dd sd +
C2C rev. 0 ADM3202/adm3222/adm1385Cspecifications parameter min typ max units test conditions/comments dc characteristics operating voltage range 3.0 3.3 5.5 v v cc power supply current 1.3 2.1 ma no load 810 mar l = 3 k w to gnd shutdown supply current 0.01 0.5 m a logic input logic threshold low, v inl 0.8 v t in input logic threshold high, v inh 2.0 v t in cmos output voltage low, v ol 0.4 v i out = 1.6 ma cmos output voltage high, v oh v cc C 0.6 v i out = C1 ma input leakage current 0.01 1 m at in = gnd to v cc output leakage current 10 m a receivers disabled rs-232 receiver eia-232 input voltage range C30 +30 v eia-232 input threshold low 0.6 1.2 v eia-232 input threshold high 1.6 2.4 v eia-232 input hysteresis 0.4 v eia-232 input resistance 3 5 7 k w rs-232 transmitter output voltage swing (rs-232) 5.0 5.2 v v cc = 3.3 v. all transmitter outputs loaded with 3 k w to ground output voltage swing (rs-562) 3.7 v v cc = 3.0 v transmitter output resistance 300 w v cc = 0 v, v out = 2 v rs-232 output short circuit current 15 ma output leakage current 25 m a sd = low, v out = 12 v timing characteristics maximum data rate 460 kbps v cc = 3.3 v, r l = 3 k w to 7 k w , c l = 50 pf to receiver propagation delay 1000 pf. one tx switching tphl 0.4 1 m s tplh 0.4 1 m s transmitter propagation delay 300 750 ns r l = 3 k w , 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 rate measured from +3 v to C3 v or C3 v to +3 v, v cc = +3.3 v 61030v/ m sr l = 3 k w , c l = 1000 pf, t a = +25 c 41030v/ m sr l = 3 k w , c l = 2500 pf, t a = +25 c specifications subject to change without notice. (v cc = +3.3 v 6 0.3 v, c1Cc4 = 0.1 m f. all specifications t min to t max unless otherwise noted.)
ADM3202/adm3222/adm1385 C3C rev. 0 absolute maximum ratings* (t a = +25 c unless otherwise noted) v cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C0.3 v to +6 v v+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . (v cc C 0.3 v) to +14 v vC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 v to C14 v input voltages t in . . . . . . . . . . . . . . . . . . . . . . . . . . C0.3 v to (v+, +0.3 v) r in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 v output voltages t out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 v r out . . . . . . . . . . . . . . . . . . . . . . . C0.3 v to (v cc + 0.3 v) short circuit duration t out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous power dissipation power dissipation n-16 . . . . . . . . . . . . . . . . . . . . . 450 mw (derate 6 mw/ c above +50 c) q ja , thermal impedance . . . . . . . . . . . . . . . . . . . 117 c/w power dissipation r-16 . . . . . . . . . . . . . . . . . . . . . 450 mw (derate 6 mw/ c above +50 c) q ja , thermal impedance . . . . . . . . . . . . . . . . . . . 158 c/w power dissipation ru-16 . . . . . . . . . . . . . . . . . . . 500 mw (derate 6 mw/ c above +50 c) q ja , thermal impedance . . . . . . . . . . . . . . . . . . . 158 c/w power dissipation r-18 . . . . . . . . . . . . . . . . . . . . . 450 mw (derate 6 mw/ c above +50 c) q ja , thermal impedance . . . . . . . . . . . . . . . . . . . 158 c/w power dissipation rs-20 . . . . . . . . . . . . . . . . . . . . 450 mw (derate 6 mw/ c above +50 c) q ja , thermal impedance . . . . . . . . . . . . . . . . . . . 158 c/w power dissipation ru-20 . . . . . . . . . . . . . . . . . . . 450 mw (derate 6 mw/ c above +50 c) q ja , thermal impedance . . . . . . . . . . . . . . . . . . . 158 c/w operating temperature range industrial (a version) . . . . . . . . . . . . . . . . C40 c to +85 c storage temperature range . . . . . . . . . . . . C65 c to +150 c lead temperature (solderi ng, 10 sec) . . . . . . . . . . . . . +300 c esd rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .<1500 v *this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operation sections of this specificatio n is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. ordering guide model temperature range package options* ADM3202an C40 c to +85 c n-16 ADM3202arn C40 c to +85 c r-16a ADM3202arw C40 c to +85 c r-16 ADM3202aru C40 c to +85 c ru-16 adm3222an C40 c to +85 c n-18 adm3222arw C40 c to +85 c r-18 adm3222ars C40 c to +85 c rs-20 adm3222aru C40 c to +85 c ru-20 adm1385ars C40 c to +85 c rs-20 *n = plastic dip; r = small outline; rs = shrink small outline; ru = thin shrink small outline.
ADM3202/adm3222/adm1385 C4C rev. 0 pin function descriptions mnemonic function v cc power supply input: +3.3 v 0.3 v. v+ internally generated positive supply (+6 v nominal). vC internally generated negative supply (C6 v nominal). gnd ground pin. must be connected to 0 v. c1+, c1C external capacitor 1 is connected between these pins. 0.1 m f capacitor is recommended but larger capacitors up to 47 m f may be used. c2+, c2C external capacitor 2 is connected between these pins. 0.1 m f capacitor is recommended but larger capacitors up to 47 m f may be used. tx in transmitter (driver) inputs. these inputs ac cept ttl/cmos levels. tx out transmitter (driver) outputs. these are rs-232 signal levels (typically 9 v). rx in receiver inputs. these inputs accept rs-232 signal levels. an internal 5 k w pull-down resistor to gnd is connected on each input. rx out receiver outputs. these are cmos output logic levels. en (adm3222) receiver enable, active low. when low, the receiver outputs are en abled. when high, they are three-stated. sd (adm3222) shutdown control. active low. when low, the charge pump is shut down and the transmitter outputs are disabled. sd (adm1385) shutdown control. when low, the charge pump is shut down and all transmitters and receivers are disabled. dd (adm1385) driver disable. when low, the charge pump is turned off and the transmitters are disabled. the receivers remain active. pin connections dip (n, r packages) pin connections dip (rs, ru packages) top view (not to scale) 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 adm1385 (ssop) nc = no connect nc r2 in t2 out c1+ v+ c1C vC c2C c2+ nc t2 in t1 in v cc gnd t1 out r2 out r1 out r1 in dd sd top view (not to scale) 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 c1+ v+ c1C c2+ c2C vC t2 out r2 in v cc gnd t1 out r1 in r1 out t1 in t2 in r2 out ADM3202 top view (not to scale) 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 adm3222 (ssop tssop) nc = no connect r2 out r2 in t2 out c1+ v+ c1C vC c2C c2+ nc t2 in t1 in v cc gnd t1 out nc r1 out r1 in en sd top view (not to scale) 18 17 16 15 14 13 12 11 10 1 2 3 4 5 6 7 8 9 adm3222 r2 in t2 out en c1+ v+ c1C vC c2C c2+ t2 in sd v cc gnd t1 out t1 in r1 out r1 in r2 out
ADM3202/adm3222/adm1385 C5C rev. 0 typical performance characteristics load capacitance C pf 6 4 C6 0 5000 1000 2000 3000 4000 2 0 C2 C4 t out (high) t out (low) figure 1. transmitter output voltage high/low vs. load capacitance @ 230 kbps v cc C v 12 10 0 3 5.5 3.5 4.0 4.5 5.0 8 6 4 2 figure 2. transmitter output voltage high vs. v cc current C ma 8 6 C4 010 2468 4 2 0 C2 C6 C8 t1 out (low) C v t1 out (high) C v figure 3. transmitter output voltage low/high vs. load current current C ma 8 6 C4 0 10203040 4 2 0 C2 C6 C8 vC (v) v+ (v) figure 4. charge pump v+, vC vs. current v cc C v 250 200 0 3.0 5.5 3.5 4.0 4.5 5.0 150 100 50 vC impedance v+ impedance figure 5. charge pump impedance vs. v cc load capacitance C pf 25 20 0 0 5000 1000 2000 3000 4000 15 10 5 i dd (ma) @ 250kbps i dd (ma) @ 160kbps i dd (ma) @ 80kbps figure 6. power supply current vs. load capacitance
ADM3202/adm3222/adm1385 C6C rev. 0 general description the adm320 2/adm3222/adm1385 are rs-232 line drivers/ receivers. 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. the ADM3202/adm3222 /adm1385 is a modification, en- hancement and improvement to the ad230Cad241 family and its derivatives. it is essentially plug-in compatible and does not have materially different applications. circuit description the internal circuitry consists of three main sections. these are: 1. a charge pump voltage converter 2. 3.3 v logic to eia-232 transmitters 3. eia-232 to 5 v logic receivers. charge pump dc-dc voltage converter the charge pump voltage converter consists of a 200 khz oscil- lator and a switching matrix. the converter generates a 6.6 v supply from the input +3.3 v level. this is done in two stages using a switched capacitor technique as illustrated below. first, the +3.3 v input supply is doubled to +6.6 v using capacitor c1 as the charge storage element. the +6.6 v level is then inverted to generate C6.6 v using c2 as the storage element. c3 is shown connected between v+ and v cc , but is equally effec- tive if connected between v+ and gnd. capacitors c3 and c4 are used to reduce the output ripple. their values are not critical and can be increased if desired. capacitor c3 is shown connected between v+ and v cc . it is also acceptable to connect this capacitor between v+ and gnd. if desired, larger capacitors (up to 10 m f) can be used for ca- pacitors c1Cc4. +3.3v to +6.6v voltage doubler c1+ c1C c5 0.1 m f + v cc v+ 0.1 m f 10v + + c3 0.1 m f 6.3v +3.3v input +6.6v to C6.6v voltage inverter c2+ c2C + vC 0.1 m f 10v + c4 0.1 m f 10v t1 out t1 in t2 out t2 in eia/tia-232 outputs r1 out r2 out r1 in r2 in eia/tia-232 inputs* cmos inputs cmos outputs ADM3202 gnd *internal 5k v pull-down resistor on each rs-232 input +3.3v to +6.6v voltage doubler c1+ c1C c5 0.1 m f + v cc v+ 0.1 m f 10v + + c3 0.1 m f 6.3v +3.3v input +6.6v to C6.6v voltage inverter c2+ c2C + vC 0.1 m f 10v + c4 0.1 m f 10v t1 out t1 in t2 out t2 in eia/tia-232 outputs r1 out r2 out r1 in r2 in eia/tia-232 inputs* cmos inputs cmos outputs adm3222 gnd *internal 5k v pull-down resistor on each rs-232 input t1 t2 r2 r1 t1 t2 r2 r1 en sd +3.3v to +6.6v voltage doubler c1+ c1C c5 0.1 m f + v cc v+ 0.1 m f 10v + c3 0.1 m f 6.3v +3.3v input +6.6v to C6.6v voltage inverter c2+ c2C + vC 0.1 m f 10v + c4 0.1 m f 10v t1 out t1 in t2 out t2 in eia/tia-232 outputs r1 out r2 out r1 in r2 in eia/tia-232 inputs* cmos inputs cmos outputs adm1385 gnd *internal 5k v pull-down resistor on each rs-232 input t1 t2 r2 r1 dd sd + figure 8. typical operating circuits 1 m s/div t1 in 2v/div t1 out 5v/div figure 7. 230 kbps data transmission
ADM3202/adm3222/adm1385 C7C rev. 0 outline dimensions dimensions shown in inches and (mm). 16-lead plastic dip (n-16) 16 18 9 0.840 (21.34) 0.745 (18.92) 0.280 (7.11) 0.240 (6.10) pin 1 seating plane 0.022 (0.558) 0.014 (0.356) 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) max 0.130 (3.30) min 0.070 (1.77) 0.045 (1.15) 0.100 (2.54) bsc 0.160 (4.06) 0.115 (2.93) 0.325 (8.26) 0.300 (7.62) 0.015 (0.381) 0.008 (0.204) 0.195 (4.95) 0.115 (2.93) 16-lead thin shrink small outline (tssop) (ru-16) 16 9 8 1 0.201 (5.10) 0.193 (4.90) 0.256 (6.50) 0.246 (6.25) 0.177 (4.50) 0.169 (4.30) pin 1 seating plane 0.006 (0.15) 0.002 (0.05) 0.0118 (0.30) 0.0075 (0.19) 0.0256 (0.65) bsc 0.0433 (1.10) max 0.0079 (0.20) 0.0035 (0.090) 0.028 (0.70) 0.020 (0.50) 8 0 16-lead narrow body soic (r-16a) 16 9 8 1 0.3937 (10.00) 0.3859 (9.80) 0.2440 (6.20) 0.2284 (5.80) 0.1574 (4.00) 0.1497 (3.80) pin 1 seating plane 0.0098 (0.25) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.0688 (1.75) 0.0532 (1.35) 0.0500 (1.27) bsc 0.0099 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 8 8 0 8 0.0196 (0.50) 0.0099 (0.25) x 45 8 16-lead wide body soic (r-16) 0.2992 (7.60) 0.2914 (7.40) 16 9 8 1 0.4133 (10.50) 0.3977 (10.00) 0.4193 (10.65) 0.3937 (10.00) pin 1 seating plane 0.0118 (0.30) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.1043 (2.65) 0.0926 (2.35) 0.0500 (1.27) bsc 0.0125 (0.32) 0.0091 (0.23) 0.0500 (1.27) 0.0157 (0.40) 0.0291 (0.74) 0.0098 (0.25) x 45 8 8 8 0 8 c1 + c3 + s3 s4 s1 s2 internal oscillator v cc gnd v cc v+ = 2v cc figure 9. charge pump voltage doubler c2 + c4 + s3 s4 s1 s2 internal oscillator v + gnd vC = C(v+) gnd from voltage doubler figure 10. charge pump voltage inverter transmitter (driver) section the drivers convert 3.3 v logic input levels into rs-232 output levels. with v cc = +3.3 v and driving an rs-232 load, the output voltage swing is typically 6 v. receiver section the receivers are inverting level-shifters that accept rs-232 input levels and translate them into 3 v logic output levels. the inputs have internal 5 k w pull-down resistors to ground and are also protected against overvoltages of up to 30 v. uncon- nected inputs are pulled to 0 v by the internal 5 k w pull-down resistor. this, therefore, results in a logic 1 output level for unconnected inputs or for inputs connected to gnd. the receivers have schmitt trigger inputs with a hysteresis level of 0.4 v. this ensures error-free reception for both noisy inputs and for inputs with slow transition times. high baud rate the ADM3202e/adm3222e feature high slew rates permitting data transmission at rates well in excess of the eia/rs-232e specifications. rs-232 voltage levels are maintained at data rates up to 460 kbps even under worst case loading conditions. this allows for high speed data links between two terminals or indeed it is suitable for the new generation i sdn modem standards which requires data r ates of 230 kbps. the slew rate is internally con- trolled to less than 30 v/ m s in order to minimize emi interference.
ADM3202/adm3222/adm1385 C8C rev. 0 c3272C8C3/98 printed in u.s.a. 20-lead thin shrink small outline (tssop) (ru-20) 20 11 10 1 0.260 (6.60) 0.252 (6.40) 0.256 (6.50) 0.246 (6.25) 0.177 (4.50) 0.169 (4.30) pin 1 seating plane 0.006 (0.15) 0.002 (0.05) 0.0118 (0.30) 0.0075 (0.19) 0.0256 (0.65) bsc 0.0433 (1.10) max 0.0079 (0.20) 0.0035 (0.090) 0.028 (0.70) 0.020 (0.50) 8 8 0 8 18-lead plastic dip (n-18) 18 19 10 0.925 (23.49) 0.845 (21.47) 0.280 (7.11) 0.240 (6.10) pin 1 seating plane 0.022 (0.558) 0.014 (0.356) 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) max 0.130 (3.30) min 0.070 (1.77) 0.045 (1.15) 0.100 (2.54) bsc 0.160 (4.06) 0.115 (2.93) 0.325 (8.25) 0.300 (7.62) 0.015 (0.381) 0.008 (0.204) 0.195 (4.95) 0.115 (2.93) 18-lead wide body soic (r-18) seating plane 0.0118 (0.30) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.1043 (2.65) 0.0926 (2.35) 0.0500 (1.27) bsc 0.0125 (0.32) 0.0091 (0.23) 0.0500 (1.27) 0.0157 (0.40) 8 8 0 8 0.0291 (0.74) 0.0098 (0.25) x 45 8 18 10 9 1 0.4625 (11.75) 0.4469 (11.35) 0.4193 (10.65) 0.3937 (10.00) 0.2992 (7.60) 0.2914 (7.40) pin 1 20-lead shrink small outline (ssop) (rs-20) 20 11 10 1 0.295 (7.50) 0.271 (6.90) 0.311 (7.9) 0.301 (7.64) 0.212 (5.38) 0.205 (5.21) pin 1 seating plane 0.008 (0.203) 0.002 (0.050) 0.07 (1.78) 0.066 (1.67) 0.0256 (0.65) bsc 0.078 (1.98) 0.068 (1.73) 0.009 (0.229) 0.005 (0.127) 0.037 (0.94) 0.022 (0.559) 8 8 0 8
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