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as1500/as1501/as1502/as1503 digital potentiometer data sheet www.austriamicrosystems.com revision 1.01 1 - 14 1 general description the as1500 is a digital potentiometer with 256 programmable steps. the valu es of the resistor can be controlled via 3 wire serial interface capable to handle programming rates up to 10mhz. the as1500 is available in four different resistor values. the as1500 incorporates a 10k , the as1501 a 20k , the as1502 a 50k and the as1503 a 100k fixed resistor. the wiper contact taps the fixed resistor at points determined by the 8-bit digital code word. the resistance between the wiper and the endpoint of the resistor is linear. the switching action is performed in a way that no glitches occur. the as150x is available in an 8-pin soic package. all parts are guaranteed to o perate over the extended industrial temperature r ange of ?40o to +125o. 2 key features 256 - taps available in four resistance values - as1500 resistance 10k - as1501 resistance 20k - as1502 resistance 50k - as1503 resistance 100k standby current - less than 1 a 3-wire serial data interface 10 mhz update data loading rate 2.7 v to 5.5 v single-supply operation temperature range ?40o to +125o 8-pin soic package 3 applications the as1500 is ideal for volume controls in tv sets and audio systems, and applications that require line impedance matching, programmable filters or power supply adjustment. the as1500 can also be designed in as a replacement for mechanical potentiometers. figure 1. application diagram 8 8 a w b 10 bit serial latch 8-bit latch v cc gnd sdi ck csn
www.austriamicrosystems.com revision 1.01 2 - 14 as1500 data sheet - pin assignments 4 pin assignments figure 2. pin assignments (top view) pin descriptions table 1. pin description pin name pin number description b1 terminal b rdac gnd 2 ground csn 3 chip select input , active low. when csn returns high, data in the serial input register is loaded into the dac register. sdi 4 serial data input ck 5 serial clock input , positive edge triggered. vcc 6 positive power supply , specified for operation at both 3v and 5v. w7 wiper rdac a8 terminal a rdac 1 b as1500 2 gnd 3 csn 8 a 7 w 6 vcc 4 sdi 5 ck
www.austriamicrosystems.com revision 1.01 3 - 14 as1500 data sheet - absolute maximum ratings 5 absolute maximum ratings (ta = 25o c, unless otherwise noted) table 2. absolute maximum ratings parameter min max units notes v cc to gnd -0.3 +7 v va, vb, vw to gnd 0 v cc v ax ? bx, ax ? wx, bx ? wx 20 ma digital input and output voltage to gnd 0 +7 v operating temperature range -40 +125 oc maximum junction temperature (tj max) +150 oc storage temperature -65 +150 oc package body temperature +260 oc the reflow peak soldering temperature (body temperature) specified is in accordance with ipc/jedec j-std- 020c ?moisture/reflow sensitivity classification for non-hermetic solid state surface mount devices?. the lead finish for pb-free leaded packages is matte tin (100% sn). package power dissipation (tj max - ta) / ja esd 1 kv hbm mil-std883e 3015.7methods.
www.austriamicrosystems.com revision 1.01 4 - 14 as1500 data sheet - electrical characteristics 6 electrical characteristics as1500 / as1501 ? specifications v cc = 3v10% or 5v10%, v a = v cc , v b = 0v, ?40oc t a +125oc unless otherwise noted. table 3. electrical characteristics ? 10k and 20k versions symbol parameter conditions min typ 1 max units dc characteristics rheostat mode r ab nominal resistance 2 t a = 25oc, v cc = 5v, as1500, version: 50k 81012k t a = 25oc, v cc = 5v, as1501, version: 100k 16 20 24 k r ab / t resistance tempco 3 v ab = v cc , wiper = no connect 500 ppm/oc r w wiper resistance v cc = 5v 20 100 200 r-dnl resistor differential nl 4 r wb , v cc = 5v, v a = no connect -1 1/4 +1 lsb r-inl resistor integral nl r wb , v cc = 5v, v a = no connect -2 1/2 +2 lsb dc characteristics potentiometer divider n resolution 8bits inl integral nonlinearity v cc = 5.5v t a = 25oc -2 1/2 +2 lsb v cc = 2.7v t a = 25oc -2 1/2 +2 lsb dnl differential nonlinearity v cc = 5.5v t a = 25oc -1 1/4 +1 lsb v cc = 2.7v t a = 25oc -1 1/4 +1 lsb v w / t voltage divider tempco code = 80 h 15 ppm/oc v wfse full-scale error code = ff h , v cc = 5.5v -4 -2.8 0 lsb v wfse zero-scale error code = 00 h , v cc = 5.5v 01.32lsb resistor terminals v a, b, w voltage range 5 0v cc v c a, b capacitance 6 ax, bx f =1mhz, measured to gnd, code = 80 h 75 pf c w capacitance wx f =1mhz, measured to gnd, code = 80 h 120 pf digital inputs and outputs v ih input logic high v cc = 5v 2.4 v v il input logic low v cc = 5v 0.8 v v ih input logic high v cc = 3v 2.1 v v il input logic low v cc = 3v 0.6 v i ih , i il input current v in = 5v or 0v, v cc = 5v 1 a c il input capacitance 5pf power supplies v cc power supply range 2.7 5.5 v i dd supply current (cmos) v ih = v cc or v il = 0v, v cc = 5.5v 0.1 1 a i dd supply current (ttl) 7 v ih = 2.4v or 0.8v, v cc = 5.5v 0.9 4 ma
www.austriamicrosystems.com revision 1.01 5 - 14 as1500 data sheet - electrical characteristics as1502 / as1503 ? specifications v cc = 3v10% or 5v10%, v a = v cc , v b = 0v, ?40oc t a +125oc unless otherwise noted. p diss power dissipation (cmos) 8 v ih = v cc or v il = 0v, v cc = 5.5v 27.5 w pssr power supply suppression ratio v cc = 5v+0.5v p sine wave @ 1khz as1500, version: 10k -54 -25 db as1501, version: 20k -52 -25 db dynamic characteristics 9 bw_10k bandwidth ?3db bandwidth ?3db r wb = 10k , v cc = 5v 1000 khz bw_20k r wb = 20k , v cc = 5v 500 khz thd w total harmonic distortion v a = 1v rms + 2v dc , v b = 2v dc , f = 1khz 0.003 % t s _10k vw settling time r wb = 5k , v a = v cc , v b = 0v, 1% error band 2 s t s _20k r wb = 10k , v a = v cc , v b = 0v, 1% error band 4s e nwb _10k resistor noise voltage r wb = 5k , f =1khz 9nv/ hz e nwb _20k r wb = 10k , f =1khz 13 nv/ hz 1. typicals represent avera ge readings at 25oc and v cc = 5v. 2. wiper is not connected. i ab = 350a for the 10k version and 175a for the 20k version. 3. all tempcos are guaranteed by design and not subject to production test. 4. terminal a is not connected. i w = 350a for the 10k version and 175a for the 20k version. 5. resistor terminals a, b, w have no limitati ons on polarity with respect to each other. 6. all capacitances are guaranteed by design and not subj ect to production test. resistor-terminal capacitance tests are measured with 2.5v bias on the measured terminal. the remaining resistor terminals are left open cir- cuit. 7. worst-case supply current consumed when input logic level at 2.4v, standard characteristic of cmos logic. 8. p diss is calculated from (i dd v cc ). cmos logic level inputs result in minimum power dissipation. 9. all dynamic characteristics are guaranteed by design and not subject to production test. all dynamic characteris- tics use v cc =5v. table 4. electrical characteristics ? 50k and 100k versions symbol parameter conditions min typ 1 max units dc characteristics rheostat mode r ab nominal resistance 2 t a = 25oc, v cc = 5v, as1502, version: 50k 40 50 60 k t a = 25oc, v cc = 5v, as1503, version: 100k 80 100 120 k r ab / t resistance tempco 3 v ab = v cc , wiper = no connect 500 ppm/oc r w wiper resistance v cc = 5v 20 100 200 r-dnl resistor differential nl 4 r wb , v cc = 5v, v a = no connect -1 1/4 +1 lsb r-inl resistor integral nl r wb , v cc = 5v, v a = no connect -2 1/2 +2 lsb table 3. electrical characteristics ? 10k and 20k versions symbol parameter conditions min typ 1 max units
www.austriamicrosystems.com revision 1.01 6 - 14 as1500 data sheet - electrical characteristics dc characteristics potentiometer divider n resolution 8bits inl integral nonlinearity v cc = 5.5v t a = 25oc -4 1 +4 lsb v cc = 2.7v t a = 25oc -4 1 +4 lsb dnl differential nonlinearity v cc = 5.5v t a = 25oc -1 1/4 +1 lsb v cc = 2.7v t a = 25oc -1 1/4 +1 lsb v w / t voltage divider tempco code = 80 h 15 ppm/oc v wfse full-scale error code = ff h , v cc = 5.5v -1 -0.25 0 lsb v wfse zero-scale error code = 00 h , v cc = 5.5v 00.11lsb resistor terminals v a, b, w voltage range 5 0v cc v c a, b capacitance 6 ax, bx f =1mhz, measured to gnd, code = 80 h 15 pf c w capacitance wx f =1mhz, measured to gnd, code = 80 h 80 pf digital inputs and outputs v ih input logic high v cc = 5v 2.4 v v il input logic low v cc = 5v 0.8 v v ih input logic high v cc = 3v 2.1 v v il input logic low v cc = 3v 0.6 v i ih , i il input current v in = 5v or 0v, v cc = 5v 1 a c il input capacitance 5pf power supplies v cc power supply range 2.7 5.5 v i dd supply current (cmos) v ih = v cc or v il = 0v, v cc = 5.5v 0.1 1 a i dd supply current (ttl) 7 v ih = 2.4v or 0.8v, v cc = 5.5v 0.9 4 ma p diss power dissipation (cmos) 8 v ih = v cc or v il = 0v, v cc = 5.5v 27.5 w pssr power supply suppression ratio v cc = 5v+0.5v p sine wave @ 1khz as1502, version: 50k -43 db as1503, version: 100k -52 db dynamic characteristics 9 bw_50k bandwidth ?3db bandwidth ?3db r wb = 50k , v cc = 5v 220 khz bw_100k r wb = 100k , v cc = 5v 110 khz thd w total harmonic distortion v a = 1v rms + 2v dc , v b = 2v dc , f = 1khz 0.003 % table 4. electrical characteristics ? 50k and 100k versions symbol parameter conditions min typ 1 max units
www.austriamicrosystems.com revision 1.01 7 - 14 as1500 data sheet - electrical characteristics as150x ? specifications v cc = 3v10% or 5v10%, v a = v cc , v b = 0v, ?40oc t a +125oc unless otherwise noted. t s _50k vw settling time r wb = 50k , v a = v cc , v b = 0v, 1% error band 9 s t s _100k r wb = 100k , v a = v cc , v b = 0v, 1% error band 18 s e nwb _50k resistor noise voltage r wb = 50k , f =1khz 20 nv/ hz e nwb _100k r wb = 100k , f =1khz 29 nv/ hz 1. typicals represent avera ge readings at 25oc and v cc = 5v. 2. wiper is not connected. i ab = 70a for the 50k version and 35a for the 100k version. 3. all tempcos are guaranteed by design and not subject to production test. 4. terminal a is not connected. i w = 70a for the 50k version and 35a for the 100k version. 5. resistor terminals a, b, w have no limitati ons on polarity with respect to each other. 6. all capacitances are guaranteed by design and not subj ect to production test. resistor-terminal capacitance tests are measured with 2.5v bias on the measured terminal. the remaining resistor terminals are left open cir- cuit. 7. worst-case supply current consumed when input logic level at 2.4v, standard characteristic of cmos logic. 8. p diss is calculated from (i dd v cc ). cmos logic level inputs result in minimum power dissipation. 9. all dynamic characteristics are guarant eed by design and not subject to production test. all dynamic characteris- tics use v cc =5v. table 5. switching characteristics symbol parameter conditions min typ 1 1. typicals represent avera ge readings at 25oc and v cc =5v. max unit switching characteristics 2 3 2. guaranteed by design and not subject to production tes t. resistor-terminal capacitance tests are measured with 2.5v bias on the measured terminal. the remain ing resistor terminals are left open circuit. 3. see timing diagram for location of measured values. all i nput control voltages are specified with tr = tf = 1ns (10% to 90% of v cc ) and timed from a voltage level of 1.6v. switching characteristics are measured using v cc =3v or 5v. to avoid false clocking, a minimum input logic slew rate of 1v/s should be maintained. t ch , t cl input clock pulsewidth clock level high or low 50 ns t ds data setup time 5 ns t dh data hold time 5 ns t css csn setup time 10 ns t cswh csn high pulsewidth 10 ns t cswl csn low pulsewidth 100 ms t csh ck fall to csn rise hold time 0ns t cs1 csn rise to clock rise setup 10 ns table 4. electrical characteristics ? 50k and 100k versions symbol parameter conditions min typ 1 max units
www.austriamicrosystems.com revision 1.01 8 - 14 as1500 data sheet - detailed description 7 detailed description serial-programming programming of the as150x is done via the 3 wire serial inte rface. the three input signals are serial data input (sdi), clock(ck) and chip select (csn). a programming sequence cons ists of 10-bit, where the last eight bit contain the code word for the resistor value. the first two bits a1 and a0 have to be low to program the resistor value (see table 6) . otherwise the resistor value is not affect ed. the data is shifted into the internal 10 bit register with the rising edge of the ck signal. with the rising edge of the csn signal the data become valid and the resistance is updated (see figure 3) . a detailed block diagram is shown in figure 4 . table 6. serial data format (10 bits) figure 3. timing diagram figure 4. detailed timing diagram a1 a0 d7 d6 d5 d4 d3 d2 d1 d0 00 msb data lsb a1 a0 d7 d6 d5 d4 d3 d2 d1 d0 1 0 1 0 0 1 vcc 0v v out sdi ck csn dac register load a x or d x a x or d x t ch t d t csh t d t cl t css t cswh t cs1 1% error band 1 0 1 0 0 1 0v vcc v out csn ck sdi t s t cswl
www.austriamicrosystems.com revision 1.01 9 - 14 as1500 data sheet - detailed description rheostat operation the digital potentiometer family as150x of fers nominal resistor values of 10k , 20k , 50k and 100k . the resistor has 256 contact points where the wiper can access the resist or. the 8-bit code word determines the position of the wiper and is decoded through an internal logic. the lowest code 00h is related to the terminal b. the resistance is then only determined by the wiper resistance (100 ). the resistance for the next code 01h is the nominal resistor rab (10k , 20k , 50k or 100k ) divided through 256 plus the wiper resistor. in case of as1501 (10k ) the total resistance is 39 +100 =139 . accordingly the resistor for code 02h is 78 +100 =178 . the last code 255h does not connect to terminal a directly (see figure 5). so the maximum value is 10000 - 39 +100 = 10061 . the general formula for the calculation of the resistance r wb is: r wb (dx)= (dx)/256 ? r ab + r w (eq 1) where r ab is the nominal resistance between terminal a and b, r w is the wiper resistance and d x is the 8-bit code word. in table 7 the resistor values between the wiper and terminal b for as1500 are given for specific codes d x . in the zero-scale condition the wiper resistance of 100 remains present. the maximum current through the wiper and terminal b is 5ma. if the current exceeds this limit the internal switches can degrade or even be damaged. as a mechanical potentiometer the resistances r wa and r wb are totally symmetrical. the relation between them is shown in figure 5 . figure 5. r wa and r wb versa code table 7. rdac-codes wb d x (dec) r wb ( ) output state 255 10061 full scale 128 5100 midscale 1 139 1 lsb 0100 zero-scale (wiper contact resistance) 25 10 75 50 25 0 0 64 12 19 code - decimal r wa , r wb - % of nominal r ab r wa r wb
www.austriamicrosystems.co m revision 1.01 10 - 14 as1500 data sheet - detailed description the resistance r wa is the complimentary resistor to r wb and can be controlled digitally as well. r wa starts at the maximum value of the nominal resistance and is reduced with increasing 8-bit code words. the formula to calculate r wa is given below: r wa (dx)= (256 - dx)/256 ? r ab + r w (eq 2) where r ab is the nominal resistance between terminal a and b, r w is the wiper resistance and dx is the 8-bit code word. in table 8 the resistor values between the wiper a nd terminal b for as1500 are given for specific codes dx. figure 6. equivalent rdac circuit voltage output operation the as150x family can easily used in an voltage output m ode, where the output voltage is proportional to an applied voltage to a given terminal. when 5v are applied to terminal a and b is set to ground the ouput voltage at the wiper starts at zero volts up to 1lsb less then 5v. one lsb of voltage corresponds to the voltage applied at terminal ab divided through 256 steps of possible wiper settings. the formula is given by v w (dx)= (dx)/256 ? v ab + v b (eq 3) where v ab is the voltage applied between terminal a and b, vw is the voltage at the wiper, dx is the 8-bit code word and v b is the voltage at terminal b. the temperature drift is significant better than in rheostat mode, since the temperature coefficient is determined by the internal resist or ratio. therefore the temperature drift is only 15ppm/c. table 8. rdac-codes wa d x (dec) r wa ( ) output state 255 89 full scale 128 5050 midscale 1 10011 1 lsb 0 10050 zero-scale a w b r s =r nominal /256 r s r s r s r s d7 d6 d5 d4 d3 d2 d1 d0 rdac latch and decode
www.austriamicrosystems.co m revision 1.01 11 - 14 as1500 data sheet - detailed description applications the digital potentiometer can replace in many applications the analog trimming potentiometer. the digital potentiometer is not sens itive to vibrations and shocks. it has an extremely small form-factor and can be adjusted very fast (e.g. as1500 has an update rate of 600khz). furt hermore the temperature drift, resolution and noise are significant better and cannot be achiev ed with a mechanical trimming potentiome ter. due to the programmability the resistor settings can be stored in the system memory, so that after a power do wn the exact settings can be recalled easily. all analog signals must remain within 0 to v cc range. for standard potentiometer applications the wiper output can be used directly. in the case of a low impedance load, a buffer shall be used.
www.austriamicrosystems.co m revision 1.01 12 - 14 as1500 data sheet - package drawings and markings 8 package drawings and markings figure 7. 8-pin soic package symbol min max a1 0.10 0.25 b 0.36 0.46 c 0.19 0.25 d 4.80 4.98 e 3.81 3.99 e1.27bsc h 5.80 6.20 h 0.25 0.50 l .041 1.27 a 1.52 1.72 0o 8o zd 0.53ref a2 1.37 1.57 notes: 1. lead coplanarity should be 0 to 0.10mm (.004?) max. 2. package surface finishing: (2.1) top: matte (c harmilles #18-30). (2.2) all sides: matte (charmilles #18-30). (2.3) bottom: smooth or matte (charmilles #18-30). 3. all dimensions exclusive of mold flash, and end flash from the pack- age body shall not exceed 0.24mm (0.10?) per side (d). 4. details of pin #1 identifier are optional but must be located within the zone indicated.
www.austriamicrosystems.co m revision 1.01 13 - 14 as1500 data sheet - ordering information 9 ordering information table 9. model resistor delivery form package description as1500 10k tubes 8-pin soic 8-bit digital potentiometer as1501 20k tubes 8-pin soic 8-bit digital potentiometer as1502 50k tubes 8-pin soic 8-bit digital potentiometer as1503 100k tubes 8-pin soic 8-bit digital potentiometer as1500-t 10k t&r 8-pin soic 8-bit digital potentiometer as1501-t 20k t&r 8-pin soic 8-bit digital potentiometer as1502-t 50k t&r 8-pin soic 8-bit digital potentiometer as1503-t 100k t&r 8-pin soic 8-bit digital potentiometer
www.austriamicrosystems.co m revision 1.01 14 - 14 as1500 data sheet - ordering information copyrights copyright ? 1997-200 8, austriamicrosystems ag, schloss premstaett en, 8141 unterpremstae tten, austria-europe. trademarks registered ?. all rights reserved. the mate rial herein may not be reproduced, adapted, merged, translated, stored, or used wit hout the prior written consent of the copyright owner. all products and companies mentioned are trademarks or registered trademarks of their respective companies. disclaimer devices sold by austriamicrosystems ag are covered by t he warranty and patent indemni fication provisions appearing in its term of sale. austriamicrosystems ag makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freed om of the described devices from patent infringement. austriamicrosystems ag reserves the right to change spec ifications and prices at an y time and without notice. therefore, prior to designing this pro duct into a system, it is necessary to check with austriam icrosystems ag for current information. this product is intended for use in normal commercial applications. applications requiring extended temperature range, unus ual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems ag for each application. for shipments of less than 100 parts the m anufacturing flow might show deviations from the standard production flow, such as test flow or test location. the information furnished here by austriamicrosystems ag is believed to be correct and accurate. however, austriamicrosystems ag shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. no obligation or liability to reci pient or any third party shall arise or flow out of austriamicrosystems ag rendering of technical or other services. contact information headquarters austriamicrosystems ag a-8141 schloss premstaetten, austria tel: +43 (0) 3136 500 0 fax: +43 (0) 3136 525 01 for sales offices, distributors a nd representatives, please visit: http://www.austriamicr osystems.com/contact-us

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