absolute maximum ratings features single supply operation on-chip regulation 20ma output drive capability package options 20l soic wide 14l pdip cs289 20ma air-core tachometer drive circuit 1 v z v sine v bias gnd c p c p + nc v cc v cos v reg s q in s q out f/v out gnd gnd gnd gnd gnd gnd gnd 1 v z v sine v bias gnd c p c p + nc pwr gnd v cc v cos v reg s q in s q out f/v out cs289 description block diagram 1 december, 2001 - rev. 4 on semiconductor 2000 south county trail, east greenwich, ri 02818 tel: (401)885?600 fax: (401)885?786 n. american technical support: 800-282-9855 web site: www.onsemi.com archive device not recommended for new design the cs289 is specifically designed for use with air-core meter move- ments. the ic has charge pump cir- cuitry for frequency-to-voltage con- version, a shunt regulator for stable operation, a function generator, and sine and cosine amplifiers. the buffered sine and cosine outputs will typically sink or source 20ma. supply voltage (v cc )......................................................................................20v operating temperature ............................................................?0? to +100? junction temperature..................................................................?0? to 150? storage temperature.................................................................?5? to +150? lead temperature soldering wave solder (through hole styles only)...........10 sec. max, 260? peak reflow (smd styles only)............60 sec. max above 183?, 230? peak regulator + v z c p gnd v sine v bias c p + pwr gnd v cos s q in f/v out v cc v reg s q out function generator charge pump
2 package pin description package pin # pin symbol function electrical characteristics: (v cc = 13.1v, -30? t a 85?) parameter test conditions min typ max unit cs289 supply current (note 2) v cc = 15.0v 54 ma v cc = 13.1v 60 65 ma v cc = 11.3v 60 65 ma regulated voltage i reg = 4.3ma 7.7 8.5 9.3 v regulation i reg = 0 to 5ma 0.10 0.20 v signal input current t = 25? 0.1 2.0 4.0 ma saturation voltage i sq out = 5ma, i sq in = 500 a 0.20 0.55 v leakage current i sq out = 16v, v sq in = 0v 10 a input current c p + = 0, t = 25? 1 15 na f to v output v sq in = 0 (zero input), ? = 0 1.8 2.1 2.4 v cos = 0 (note 1), ? = 270 6.3 7.1 7.9 v linearity e o vs. frequency v cos = 0 (note 1), ? = 270? t = 25? -1.5 1.5 % v sine at ? = 0 v sq in = 0 (zero input), ? = 0 -0.55 0.00 0.55 v max v sine+ v cos = 0 (note 1), ? =90 3.8 4.5 5.8 v max v sine- v cos = 0 (note 1), ? = 270 -3.8 -4.5 -5.8 v coil drive current v cos = 0 (note 1), ? = 90? t = 25? 20 25 ma v cos = 0 (note 1), ? = 270 20 25 ma max v cos+ v sq in = 0 (zero input), ? = 0 3.8 4.5 5.8 v max v cos- v sine = 0 (note 1), ? = 180 -3.8 -4.5 -5.8 v coil drive current v sq in = 0 (zero input), ? = 0 20 25 ma v sine = 0 (note 1), ? = 180 20 25 ma external voltage ref. 4.98 5.40 5.85 v note 1: v sine measured v sine to v z . v cos measured v cos to v z . all other voltages specified are measured to ground. note 2: max pwr dissipation v cc x i cc - (v 2 i sine + v12 i cos ). 20l so 14l pdip 11v z external zener reference. 22v sine sine output signal. 34v bias test pin or "0" calibration pin. 4, 5, 6, 7, 7 gnd analog ground connection. 14, 15, 16, 17 85c p negative input to charge pump. 96c p+ positive input to charge pump. 10 3 nc no connection 11 8 f/v out output voltage proportional to input signal frequency.
3 cs289 typical performance characteristics v z sine output + + v p cos v p sin cosine output 0 45? 90? 135? 180? 225? 270? 2.1 3 4 5 6 7.1 f/v output (v) relationship of e , and frequency f/v out = 2.0v + freq x c t x r t x v reg frequency/output angle ( ) output angle in polar form charge pump output voltage v sine , v cos (v) -4.5 -3.5 -2.5 -1.5 v z 1.5 2.5 3.5 4.5 4.5v 4.5v 0 45? 90? 135? 180? 225? 270? v cos v sine 2.1 3.8 5.45 7.1 tachometer angular deflection ( ) function generator output voltage package pin description: continued package pin # pin symbol function note 1: v sine measured v sine to v z . v cos measured v cos to v z . all other voltages specified are measured to ground. note 2: max pwr dissipation v cc x i cc - (v 2 i sine + v12 i cos ). 20l so 14l pdip 12 9 s q out buffered square wave output signal. 13 10 s q in speed or rpm input signal. 18 11 v reg voltage regulator output. 19 12 v cos cosine output signal. 20 13 v cc supply voltage. 14 pwr gnd power ground connection.
4 cs289 function generator output ( ? ): v cc =13.1v, t a =25? ? =arctan (measured angle after calibration at 180?) for ? a =45? 90? 135? 180? 225? 270? (desired angle) ( ? a - ? m ) 4.0 temperature sensitivity: v cc =13.1v ?? mt = ? m (t=25?) - ? m (-20? t +85?) ( ?? mt ) 3.5?, -20? t +85? voltage sensitivity: t a =25? ?? mv = ? m (v cc =13.1v) - ? m (11.3v v cc 15v) ( ?? mv ) 2? 11.3v v cc 15v v sine v cos b+ 100 ? zener 5.4v sine 80mh 225 80mh 225 b+ 15 18v gnd r2 2k ? 2k ? 1k ? e tach input r t 180k ? * c out 1 f 10% r1 1k ? c t 0.01 f s q out f-v out nc c p v z v sine v bias gnd * adjust for trimming v cc v cos v reg s q in c p + cs289 figure 1. functional diagram of cs289 circuit. the input frequency is buffered through a transistor, then applied to the charge pump for frequency-to-voltage con- version (figure 1). the charge pump output voltage, e ? , will range from 2.1v with no input ( ? = 0? to 7.1v at ? = 270? the charge that appears on c t is reflected to c out through a norton amplifier. the frequency applied at s q in charges and discharges c t through r 1 and r 2 . c out reflects the charge as a voltage across resistor r t . circuit description charge pump function generator/sine and cosine amplifiers the output waveforms of the sine and cosine amplifiers are derived by on-chip amplifier/comparator circuitry. the various trip points for the circuit (i.e. 90? 180? 270? are determined by an internal resistor divider connected to the voltage regulator. the voltage e ? is compared to the divider network by the function generator circuitry. use of an external zener reference at v z allows both sine and cosine amplifiers to swing positive and negative with respect to this reference. the output magnitudes and directions have the relationship as shown in typical characteristics diagrams. note: pin connections referenced are for the 14l dip.
5 i in 0.7v 2.1v i out/e c p c p + gnd f-v out c p r t v bias c p c p + gnd v reg s q in s q out f-v out nc v cos r t c t 1k ? 10k ? trim c p v f/v out = 2.1 + frequency x c t x r t (v reg -0 .7) the above equations were used in calculating the follow- ing values, where v f/v out = 7.1v at =270 and c t = 0.01 f. 4 cylinder: freq = 200hz, r t = 320k ? 6 cylinder: freq = 300hz, r t = 220k ? 8 cylinder: freq = 400hz, r t = 150k ? cs289 tachometer application rpm 60 x # of cyl. 2 = frequency typical values shown above apply to a nominal value of v reg of 8.5 volts. it must be realized that trimming of r t will be necessary to compensate for variations in regula- tor voltage from one unit to another. an alternative to this adjustment is to replace r 2 with a potentiometer, as shown in figure 2. partial schematic shown in figure 3 represents one met- hod for use with dc applications instead of frequency. figure 2: alternate trimming method figure 3: dc application
6 part number description cs289gdw20 20 lead so wide cs289gdwr20 20 lead so wide (tape & reel) cs289gn14 14 lead pdip cs289 thermal data 14l pdip 20l soic r jc typ 48 17 c/w r ja typ 85 90 c/w d lead count metric english max min max min 14l pdip 19.69 18.67 .775 .735 20l so wide 13.00 12.60 .512 .496 package specification package dimensions in mm (inches) ordering information package thermal data on semiconductor and the on logo are trademarks of semiconductor components industries, llc (scillc). on semiconductor reserves the right to make changes without further notice to any products herein. for additional infor- mation and the latest available information, please contact your local on semiconductor representative. ?semiconductor components industries, llc, 2000 archive device not recommended for new design plastic dip (n); 300 mil wide 0.39 (.015) min. 2.54 (.100) bsc 1.77 (.070) 1.14 (.045) d some 8 and 16 lead packages may have 1/2 lead at the end of the package. all specs are the same. .203 (.008) .356 (.014) ref: jedec ms-001 3.68 (.145) 2.92 (.115) 8.26 (.325) 7.62 (.300) 7.11 (.280) 6.10 (.240) .356 (.014) .558 (.022) surface mount wide body (dw); 300 mil wide 1.27 (.050) bsc 7.60 (.299) 7.40 (.291) 10.65 (.419) 10.00 (.394) d 0.32 (.013) 0.23 (.009) 1.27 (.050) 0.40 (.016) ref: jedec ms-013 2.49 (.098) 2.24 (.088) 0.51 (.020) 0.33 (.013) 2.65 (.104) 2.35 (.093) 0.30 (.012) 0.10 (.004)
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