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1 ? fn8157.0 caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-352-6832 | intersil (and design) is a registered trademark of intersil americas inc. xdcp is a trademark of intersil americas inc. copy right intersil americas inc. 2005. all rights reserved all other trademarks mentioned are the property of their respective owners. x9015 low noise, low power, volatile single digitally controlled (xdcp?) potentiometer the intersil x9015 is a 32 tap pot entiometer that is volatile. the device consists of a string of 31 resistors that can be programmed to connect the r w /v w wiper output with any of the nodes between the connecti ng resistors. the connection point of the wiper is determined by information communicated to the device on the 3-wire port. the 3-wire port changes the tap position by a falling edge on the increment pin. the direction the wiper moves is determined by the state of the up/down pin. the wiper position at power up is tap #15. the x9015 can be used in a wide variety of applications that require a digitally controlled variable resistor to set analog values. features ?32 taps ? three-wire up/down serial interface ?v cc = 2.7v?5v ? operating i cc = 50a max. ? standby current = 1a max. ?r total = 10k ? , 50k ? , 100k ? ? packages soic-8, msop-8 pinout block diagram v cc cs inc u/d r h /v h v ss 1 2 3 4 8 7 6 5 x9015 soic/msop r l /v l r w /v w 5-bit up/down counter control circuitry one of decoder resistor array r h /v h u/d inc cs transfer gates thirty v cc v ss r l /v l r w /v w control up/down (u/d ) increment (inc ) device select (cs ) v cc (supply voltage) v ss (ground) r h /v h r w /v w r l /v l general detailed 0 1 2 28 29 30 31 two data sheet february 24, 2005
2 fn8157.0 february 24, 2005 pin descriptions r h /v h and r l /v l the high (r h /v h ) and low (r l /v l ) terminals of the x9015 are equivalent to the fixed terminals of a mechanical potentiometer. the minimum voltage is v ss and the maximum is v cc . the terminology of r l /v l and r h /v h references the relative position of the terminal in relation to wiper movement direction selected by the u/d input, and not the voltage potential on the terminal. r w /v w r w /v w is the wiper terminal and is equivalent to the movable terminal of a mechanical potentiometer. the position of the wiper within the array is determined by the control inputs. the wiper terminal series resistance is typically 200 ? at v cc =5v. at power up the wiper position is at tap #15. (v l /r l =tap #0). up/down (u/d ) the u/d input controls the direction of the wiper movement and whether the tap position is incremented or decremented. increment (inc ) the inc input is negative-edge triggered. toggling inc will move the wiper and either increment or decrement the counter in the direction indicated by the logic level on the u/d input. chip select (cs ) the device is selected when the cs input is low. when cs is returned high while the inc input is also high the x9015 will be placed in the low power standby mode until the device is selected once again. principles of operation there are two sections of the x9015: the input control, counter and decode section; and the resistor array. the input control section operates just like an up/down counter. the output of this counter is decoded to turn on a single electronic switch connecting a point on the resistor array to the wiper output. the resistor array is comprised of 31 individual resistors connected in series. the wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. that is, the counter does not wrap around when clocked to either extreme. the electronic switc hes on the device operate in a ?make before break? mode when the wiper changes tap positions. if the wiper is moved several positions, multiple taps are connected to the wiper for t iw (inc to v w change). the r total value for the device can temporarily be reduced by a significant amount if the wiper is moved several positions. when the device is powered-down, the wiper position is lost. when power is restored, the wiper is set to tap #15. instructions and programming the inc , u/d and cs inputs control the movement of the wiper along the resistor array. with cs set low the device is selected and enabled to respond to the u/d and inc inputs. high to low transitions on inc will increment or decrement (depending on the state of the u/d input) a five bit counter. the output of this counter is decoded to select one of thirty two wiper positions along the resistive array. the system may select the x9015, move the wiper and deselect the device. the new wiper position will be maintained until changed by the system or until a power-up/down cycle. the state of u/d may be changed while cs remains low. this allows the host system to enable the device and then move the wiper up and down until the proper trim is attained. symbol table pin names symbol description r h /v h high terminal r w /v w wiper terminal r l /v l low terminal v ss ground v cc supply voltage u/d up/down control input inc increment control input cs chip select control input mode selection cs inc u/d mode lh wiper up ll wiper down *h x standby mode llx normal mode waveform inputs outputs must be steady will be steady may change from low to high will change from low to high may change from high to low will change from high to low don?t care: changes allowed changing: state not known n/a center line is high impedance x9015
3 fn8157.0 february 24, 2005 ) power up and down requirements the are no restrictions on the power-u p or power-down conditions of v cc and the voltages applied to the potentiometer pins provided that v cc is always more positive than or equal to v h , v l , and v w , i.e., v cc v h , v l , v w . the v cc ramp rate spec is always in effect. notes: 1. absolute linearity is utilized to determine ac tual wiper voltage versus expected voltage = (v w(n) (actual)?v w(n) (expected)) = 1 ml maximum. 2. relative linearity is a measure of the error in step size between taps = v w (n+1) ? [v w(n) + ml] = 0.2 ml. 3. 1 ml = minimum increment = r tot /31. 4. typical values are for t a = 25c and nominal supply voltage. 5. this parameter is periodically sampled and not 100% tested. absolute maximum ratings operating conditions temperature under bias . . . . . . . . . . . . . . . . . . . . . .-65c to +135c storage temperature . . . . . . . . . . . . . . . . . . . . . . . .-65c to +150c voltage on cs , inc , u/d , v h , v l and v cc with respect to v ss . . . . . . . . . . . . . . . . . . . . . . . . -1v to +7v ? v = |v h ?v l | . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5v lead temperature (soldering 10 seconds) . . . . . . . . . . . . . . . . 300c i w (10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.5ma temperature range commercial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0c to +70c industrial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40c to +85c supply voltage (v cc ) x9015. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5v10% x9015-2.7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7v to 5.5v caution: stresses above those listed in ?absolute maximum ratings? may cause permanent damage to the device. this is a stress o nly rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. potentiometer specifications over recommended operating conditions unless otherwise stated symbol parameter test conditions/notes min. typ. max. unit r total end to end resistance variation ?20 +20 % v vh v h /r h terminal voltage 0 v cc v v vl v l /r l terminal voltage 0 v cc v power rating r total 1k ? 10 mw r w wiper resistance i w = 1ma, v cc = 5v 200 400 ? r w wiper resistance i w = 1ma, v cc = 2.7v 400 1000 ? i w wiper current -3.75 3.75 ma noise ref: 1khz -120 dbv resolution 3% absolute linearity (note 1) v w(n)(actual) ?v w(n)(expected) -1 +1 mi (note 3) relative linearity (note 2) v w(n+1) ?[v w(n)+mi ] -0.2 +0.2 mi (note 3) r total temperature coefficient 300 ppm/c ratiometric temperature coefficient 20 ppm/c c h /c l /c w potentiometer capacitances see circuit #3 10/10/25 pf x9015
4 fn8157.0 february 24, 2005 ) d.c. operating specifications over recommended operating conditions unless otherwise specified symbol parameter test conditions min. typ. (note 4) max. units i cc1 v cc active current (increment) cs = v il , u/d = v il or v ih and inc = 0.4v @ max. t cyc 50 a i cc2 v cc active current (store) (eeprom store) cs = v ih , u/d = v il or v ih and inc =v ih @ max. t wr 400 a i sb standby supply current cs = v cc ? 0.3v, u/d and inc =v ss or v cc ? 0.3v 1a i li cs , inc , u/d input leakage current v in = v ss to v cc 10 a v ih cs , inc , u/d input high voltage v cc x 0.7 v cc + 0.5 v v il cs , inc , u/d input low voltage -0.5 v cc x 0.1 v c in (note 5) cs , inc , u/d input capacitance v cc = 5v, v in = v ss , t a = 25c, f= 1mhz 10 pf test circuit #1 test circuit #2 circuit #3 spice macro model test point v w /r w v h /r h v l /r l v s force current v l vw test point v h /r h v w /r w v l /r l c h c l r w 10pf 10pf r h r l r total c w 25pf a.c. conditions of test input pulse levels 0v to 3v input rise and fall times 10ns input reference levels 1.5v x9015
5 fn8157.0 february 24, 2005 a.c. timing a.c. operating specifications over recommended operating conditions unless otherwise specified symbol parameter min. typ. (note 6) max. unit t cl cs to inc setup 100 ns t ld inc high to u/d change 100 ns t di u/d to inc setup 2.9 s t ll inc low period 1 s t lh inc high period 1 s t lc inc inactive to cs inactive 1 s t cph cs deselect time (no store) 100 ns t cph cs deselect time (store) 10 ms t iw inc to vw change 1 5 s t cyc inc cycle time 4 s t r , t f (note 7) inc input rise and fall time 500 s t pu (note 7) power up to wiper stable 5s t r v cc (note 7) v cc power-up rate 0.2 50 v/ms t wr store cycle 5 10 ms cs inc u/d v w t ci t il t ih t cyc t id t di t iw mi (8) t ic t cph t f t r 10% 90% 90% (store) notes: 6. typical values are for t a = 25c and nominal supply voltage. 7. this parameter is periodically sampled and not 100% tested. 8. mi in the a.c. timing diagram refers to the minimum incremental change in the v w output due to a change in the wiper position. x9015
6 fn8157.0 february 24, 2005 performance characteristics (typical) figure 1. typical noise figure 2. typical rtotal vs. temperature figure 3. typical total resistance temperature coefficient 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 0 102030405060708090100 frequency (khz) noise (db) 110 120 130 140 150 160 170 180 190 200 10000 9800 9600 9400 9200 9000 8800 8600 8400 8200 8000 rtotal -55 -45 -35 -25 -15 -5 5 15 25 35 45 55 65 75 temperature 85 95 105 115 125 c -55 -350 -300 -250 -200 -150 -100 -50 0 -45 -35 -25 -15 -5 5 15 25 35 temperature ppm 45 55 65 75 85 95 105 115 125 c x9015
7 fn8157.0 february 24, 2005 figure 4. typical wiper resistance figure 5. typical absolute% error per tap position figure 6. typical relative% error per tap position performance characteristics (typical) (continued) 0 0 100 200 300 400 rw ( ? ) 500 600 700 800 246810121416 tap 18 20 22 24 26 28 30 32 v cc = 2.7v 40.0% 30.0% 20.0% 10.0% 0.0% -10.0% -20.0% -30.0% -40.0% 03691215 tap absolute% error 18 21 24 27 30 20.0% 15.0% 10.0% 5.0% 0.0% -5.0% -10.0% -15.0% -20.0% 0 3 6 9 12 15 relative% error 18 21 24 27 30 tap x9015
8 fn8157.0 february 24, 2005 applications information electronic digitally controlled potentiometers provide two powe rful application advantages: (1) the variability and reliability of a solid-state potentiometer, and (2) the flexibility of computer-based digital controls. basic configurations of electronic potentiometers basic circuits v r v w /r w v r i three terminal potentiometer; variable voltage divider two terminal variable resistor; variable current v h /r h v l /r l cascading techniques buffered reference voltage ? + +5v r 1 +v ?5v v w /r w v ref v out op-07 v w /r w v w /r w +v +v +v x (a) (b) v out = v w noninverting amplifier + ? v s v o r 2 r 1 v o = (1+r 2 /r 1 )v s lm308a voltage regulator r 1 r 2 i adj v o (reg) = 1.25v (1+r 2 /r 1 )+i adj r 2 v o (reg) v in 317 offset voltage adjustment + ? v s v o r 2 r 1 100k ? 10k ? 10k ? 10k ? -12v +12v tl072 comparator with hysteresis v ul = {r 1 /(r 1 +r 2 )} v o (max) v ll = {r 1 /(r 1 +r 2 )} v o (min) + ? v s v o r 2 r 1 } } lt311a +5v ?5v (for additional circuits see an115) x9015
9 fn8157.0 february 24, 2005 msop packaging information 0.118 0.002 (3.00 0.05) 0.040 0.002 (1.02 0.05) 0.150 (3.81) ref. 0.193 (4.90) 0.030 (0.76) 0.036 (0.91) 0.032 (0.81) 0.007 (0.18) 0.005 (0.13) 0.008 (0.20) 0.004 (0.10) 0.0216 (0.55) 7 typ. r 0.014 (0.36) 0.118 0.002 (3.00 0.05) 0.012 + 0.006 / -0.002 (0.30 + 0.15 / -0.05) 0.0256 (0.65) typ. 8-lead miniature small outline gull wing package type m 0.220" 0.0256" typical 0.025" typical 0.020" typical 8 places footprint ref. note: all dimensions in i nches and (millimeters) x9015
10 fn8157.0 february 24, 2005 soic packaging information 0.150 (3.80) 0.158 (4.00) 0.228 (5.80) 0.244 (6.20) 0.014 (0.35) 0.019 (0.49) pin 1 pin 1 index 0.010 (0.25) 0.020 (0.50) 0.050 (1.27) 0.188 (4.78) 0.197 (5.00) 0.004 (0.19) 0.010 (0.25) 0.053 (1.35) 0.069 (1.75) (4x) 7 0.016 (0.410) 0.037 (0.937) 0.0075 (0.19) 0.010 (0.25) 0 - 8 x 45 8-lead plastic small outline gull wing package type s note: all dimensions in inches (in parentheses in millimeters) 0.250" 0.050" typical 0.050" typical 0.030" typical 8 places footprint x9015
11 all intersil u.s. products are manufactured, asse mbled and tested utilizing iso9000 quality systems. intersil corporation?s quality certifications ca n be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corpor ation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnishe d by intersil is believed to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of paten ts 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 intersil or its subsidiari es. for information regarding intersil corporation and its products, see www.intersil.com fn8157.0 february 24, 2005 ordering information x v cc limits -2.7 = 2.7v to 5.5v temperature range blank = commercial = 0c to +70c i = industrial = -40c to +85c package s8 = 8-lead soic m8 = 8-lead msop end to end resistance u = 50k ? w = 10k ? x9015 x x x part marking msop package top mark x9015um8 abb x9015um8-2.7 abc x9015um8i abd x9015um8i-2.7 abe x9015wm8 afq x9015wm8-2.7 afr x9015wm8i afs x9015wm8i-2.7 aft physical characteristics marking includes resistance value or code date code temp range voltage x9015

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