MC1508 | DigiCamel IC Datasheet

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MC1408 MOTOROLA | Alldatasheet

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= SEMICONDUCTOR So TECHNICAL DATA MC1508 EIGHT-BIT MULTIPLYING EIGHT-BIT MULTIPLYING DIGITAL-TO-ANALOG CONVERTER DIGITAL-TO-ANALOG CONVERTER designed for use where the output curtent is linear produet SILICON MONOLITHIC © Eight-Bit Accuracy Available in Both Temperature Ranges Relative Accuracy: 20.19% Error maximum (MC1408L8, MC1408P8, MC1508L8) © Seven and Six-Bit Accuracy Available with MC1408 Designated by 7 oF 6 Sultix after Package Suffix Fast Settling Time ~ 300 ns typical Lsurex CERAMIC PACKAGE CMOS Compatible 6 CASE 620 © Output Voltage Swing — +0.4 V to -5.0V ' @ High-Speed Multiplying Input © standard Supply Voltages: +5.0 V and P suFRK “8.0V to -15 V PLASTIC PACKAGE CASE 648 ied 1

ORDERING INFORMATION

MC1408, MC1508 MAXIMUM RATINGS (T, = +25°C unless otherwise noted} a Vee a | Operating Temperature Range TA °G ck Mot ELECTRICAL CHARACTERISTICS (Vcc = +5.0 Vdc, Veg = -15 Vde, R14 = 2,0 mA, MC1508L8: Ta = -55°C to +125°C. MC1408L Series: Ta = 0 to + 75°C unless otherwise noted. All digital inputs at high logic level.) [Characteristics [Figure | Symbol | “Min [Typ [Max [Unit | eee uC COS sore 388 Settling Time to with £172 LSB Iincludes tpl Atta = + 25°C) (Note 2) | 5 a Ta=+25C {PHL ‘Output Full Scale Current Drift - Tio | _— | =20 = PPMP Low Level, Logic “0” {vit — Low Level, Vi. = 0.8 V Le Reference Input Bias Current (Pin 18) 3] hs = eer +E a Vee = -5.0V | VEE = — 15 V, Ta = 25°C ii ‘Output Current 13] lovminy WA Reference Current Slew Rate [6 | Ser) — | 40 | — | mane | Output Current Power Supply Sensitivity [| Psari-i| — | 0s | 27) wa] Vee = - 5.0 Vde | veercaa ws | 1 S| 2 a MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA 6-16

MC1408, MC1508 TEST CIRCUITS (continued) FIGURE 5 ~ REFERENCE CURRENT SLEW ATE MEASUREMENT [Se] ne ws to Zo oo) 49 = [onl [6 C4] azo Hp 5 Ve veg i FIGURES — NEGATIVE Vie eeeeesessSsSSsSsSSSSSSSSSSSSsFssFese MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA 618

MC1408, MC1508 Re [ig (fig [Fis The | Th Lig Bs age a se Ka [| me le) Let re Le De! Te) Ay by etsy toy Prey 4 ey is) a” ey" ad ad” Mi roo A A ra TS 285s a ta is Viet OR ag aed ei Ths ER COMPENSATION — Vrefi-) Vee OUTPUT GNO a MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA 619

MC1408, MC1508 GENERAL INFORMATION Retarence Amplifier Drive and Compensation The raecance amplifier provides @ voltage at pin 14 fr con Refer to the subaaquent text stction on Settling Time for more verting the reterencevltoe to.acurrent,angsa turmaround circit_ etalon utp Tousing or currant miror for feeding te ladder, The reference empl Its power supply valve between -8.0 V and -10 V is desire, input current, 14, must always flow into pin 18 egaries ofthe a watape of between O.and-5.0'V may be applied to pin ne tetup method or reerence voltage polarity Value of his voltage wil be the maximum alla nepative out Connections or aponitiereerence vltage ae shown in Figure put wing. 2. ‘The reference voltage source supplies the ful current 114. For bipolar reference signa a in he multpiving mode, RS an be put Current Range tied to a negative voltage corresponding to the minimum input (Output ci rt Range level. It is possible to eliminate R15 with only a small sacrifice The output current maximum rating of 4.2 mA may be used in accuracy and temperature Git. Another method for bipolar «only Tor negative supply voltages typiealy move negate than inputs is own in Figure 25, “30 volts, due to the incrooned voltage drop sross the 350 ohm ‘The ampeniaton cepector value must be inreased within restore inthe refornce current ample crenas in Rid to maintain proper phase margin, for RV valet GF 1.0, 28 and 50 kilohms, minimum capactor vals 8 15, peeurgy 37, and 76 pF. The capacitor should be tied to Veg as this in y Brace cea serwienmasto Abnolute accuracy isthe measure of eBch outout curcent eel ‘A negnwe eleronce Woltope may be uted i 14 i grounded with pect Tait Intended vale, andi Gapandent upon alate and the rference voltage applied fo FS a shown in Figure 8 accuracy and fll scale current Ont. Relative aecrary 1 fe ‘high input mapadaree ihe mas navanvage tthe wear tnesnir of etch output current lovel et aracion of te fll scale Compensation invlves a capacitor to Vee on bin 16 using te currant. The relate accuracy of the. MCIAO8. i essentially alum of the previous pasranh” The Vege cetaronce wetane «constant wth temperature due Yo te aealons temperature sok ne bet ease eee ee ee rtarnce vetoae ing ofthe monoliicreuitor ladder The reference curren may Signals may be handled by connecting Hid twevositne reference aft vith temperture, cousing a change inthe absolotesccurecy voltage equal to the peak positive input level at pin 15. of output ante However, the MC1408 has @ very tow full When a dc reference voltage is used, capacitive to ground ‘scale current drift with temperature. is recommanded’ The BON lee pai Is net teense The MC1408/MC1508 Series is guaranteed accurate to with: a reference voltage. if a well regulated 5.0-V supply which drives in 1/2 LSB at +25°C at a full scale output current of 1.992 mA. coger be wae one eee Re RUNNY ech int TN eoernponds (oa relornce ampllir uu currant deve 0 connecting it to +5.0 V through another resistor and bypassing the ladder network of 2.0 mA, with the loss of one LSB = 8.0 uA theuneton of we two ston ah 0. HF to gourd. For wnchbtteaaaer aie surest eu. Ther cet Gatowmecn pie te ceserenna me allowing some mismatch in the NPN current source pair. The Wipe ta cries Lye Tigh impedance wich aso transistor _-—-steuracY test cru fs shown In Pure The TZ convert curent source sone at the oc momianes tach at Mamnstoy SS calinatedfor'9 fll sale output current of 1982 mA. This and the amplifier must be heavily compensated, decreasing the an optional step since the MC1408 accuracy is essentially the overall bandit, fame between 15 and 25 mA. Then the NC1408 ereuity’ fl ‘eae corent is immed tothe sme value with R40 hat 9 zero Value appenrsat the error amplifier output. The counter is etvoted Curput Voltage Range tnd the error band may be dplayed on an osstlowope, detected by comparators or stored in a peak detector The voltage on pin 4 i retited 10 # range of -086 to +04 , wots 1 *2866, due to the curentsaltching methods employed Two bit Dto-A converters may not be used to const @ rae ces, Sat, te current switching methods employed 162i accurate O-to-A comerter. Te-bit acurney imoliey 4 total a Ren aDe. won current swith i turned “off. We Bow rar of 1/2 of ors part n 65, 63607 #0.00076%, which it mach ‘hogs and inerease the output current level. When a curtent sich tore accurate than the 40.19% spretication provided by the is turned “on”, the negative output voltage range is restricted. MC1408x8. The bone of the termination cicut Darlington wansstor one ode voltage below round when in 1 grounded, sos negative Voltoge below the speciteg safe level wil cve te low current Multiplying Accuracy eves of the Darlington into saturation, decreasing the output The MC1408 may be uted in the multiplying mode with current evel eign accuracy when the reference currents varied over 8 'onge ‘The negative outovt voltage compliance of the MCI40B may of 256'1" The major source ol erat Is the bes eurent of te be extended to -50V vols by opening the crcut at pint. The termination amplifier Under “wors case conditions, tes sght negative supply voltage must be more negtve than -10 volts. amplifies con contibute a total ct 18 WA extra curent at the Using» full sale curent of 1.992 mA and load ressior of 2.5 output trminal, I the ftevence corent in the mul pying moss kilohis between pin and ground will yet) @ voltage Output ranges fom 16 HA to'40 mA. the 16 uA contributes on erfor of 256 levels between 0 and -4.980 volts. Floating pin 1 does of 0.1 LSB. This is well within eight-bit accuracy referenced to Tot affect the converter speed or power dsipation. However, the Sma Value of the loed resistor determines the switching time duo ‘A ranotonie converter is one which supplies an increas in ‘increased voltage swing. Values of Ry up to 500 ohms do not sig- current for each increment in the binary word. Typically, the fifieantiy affect performance, but 8 25kiohen toxd increas _-MCT408 is monotonte forall vlues of Yeference evirent Sbove “worst case sting time To 128 (hen all bits are switched onl. O'SmA. Thevrecommended range for operation with ae voerence currnt 0 8 to 40™mA eee MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA 6-20

MC1408, MC1508 GENERAL INFORMATION (Continued) apply when Ry, <500 ohms and Co <25 pF most applications. TYPICAL CHARACTERISTICS (vec = #50 V. Veg = -15 V, Ta = +25°C unless otherwase noted.) os 2 ee | SCREEEEEEe | ia a we a Afi eT rT} Til : es + PASS | Pas ee ee i eo VA Aen fen een eee | Mee yt ob — a Ene CO Lot So7 See Soe eeeeseenee a a a a | a OO ee ee 2 Wow ae A 2 | 7 OO a MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA. 6-21

MC1408, MC1508 Wee = #5.0.V, Veg = -15 V, Ta = #25°C uniess otherwise noted.) ss Cry SCC Ee Pati | Ppt oT bi -| Pe Te | EL SSeS aLIHeananaO E | ¢ Y 7 z ice Bu lo ttt ' z el 2 a LAL u A 5 et VIN) Bey —4 Sti mai 6\\\\ Sr SESEERaas TO C= 15 pF, pio 16 10 Vee = 1 } + — AL 80 pet 6H i | ear a ee Curve Large and Small Signal Bandwidth 2 bo) t= = VS= 10OmVip-) centered at DV 0 20 40 60 «80D 2 16-18-20 APPLICATIONS INFORMATION 3 ‘Theoretical Vo u Ld) biel v Al A2 AS AS AS AB OAT AB wae . ‘at vo Hm FSR SS Bl seg] Mcvaoe 4 Ad Via R40 Ro 0h Vo wih a cg! inpt ath AS a ‘Series Ro. ‘seaus Ag 12 : = ou (t bite sams avell ZH. f, Vo TRS" [stata ie 3a" a * Tae” De is6 AB! *o—= & | v0 - rev [3] = s961v 1 lee ee MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA 6-22

Mc1408, MC1508 APPLICATIONS INFORMATION (continued) ‘determined by the characteristics of the operational amplifier. In VOLTAGE RANGE ‘only, the magnitude of which is dependent on the digital input. Gio) ce Ny, the trait of wtih Cer GHA cae bn cid | in a feedforward mode resulting in a full scale settling time on a 3 t= Ae ene wo | NY The output voltage range for his cc is 0 volts © BVCR ey ° of the vonnswor. If pin 1 lef open, the Wansator base may be ° Be Mtoe must be considered for wide temperature range applica we ‘the transistor, Also, high-speed operation is possible with a large Ste (re pin wt hid converter with the non-inverting input grounded. Siacisos.e) ° 8 Since 215 °V and 15.0'V are normaly avaiable in a combina sao = vo tion sigta-to-analog system, only the -B.0 V need be develoned “9 ~n— resistor on the amplifier output is necessary for fast negative re evs diva, oD gad ecm MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA 6-23

MC1408, MC1508 APPLICATIONS INFORMATION (continued Programmable Power Supply FIGURE 22 - BIPOLAR OR NEGATIVE OUTPUT The circuit of Figure 21 can be used a a digitally programmed VOLTAGE CIRCUIT ower supply by the addition of thumbwfeel switches and a BCD- tobinary converter. The output voltage can be scaled in several ways, including 0t0 +26.5 volts in .1-volt increments, £0.08 vot ©1010 5.1 volts in 20 mV increments, 210 mV. FIGURE 21 ~ COMBINED OUTPUT AMPLIFIER and aso! ° VOLTAGE REFERENCE CIRCUIT aro! ’ sold aso2) merave series FF ral ersoe 3 veet8v €o 29 6F ss a og or be wt xt F mse os ot ccnast aa Ras 2AI6 asd a cata ee Tey mel ae aad ra iP ' azol rat I oTevo £ 14, is ' gen 4B weraoe serie (29 PY 1 aso Me1s08 t = vo = Vin, | ete eed "al seal cs nie) 2 ao ‘3652 6a 'i20' 266) my (O) aso ee 1 bevsy cE i 7. avo 1 O bw as off 9 of 1 vse 1 FIGURE 23 — BIPOLAR OR INVERTED NEGATIVE x 4 Pt ! OUTPUT VOLTAGE CIRCUIT to \\ o 1 a r 1 —__. tex Koon ye | ! Apagag nga AgAzAg Ro L3 Pasig vee sy Ro toto Vo* Yr 2S (a) setting we tors Y0.ver wap 1.0 48 ode ve dad d didd a ne e Fer 8 = o0000000 or 428.0 volt outout range 8 Svee = Viet = 8.00 veiw ey Wier ee Ska sv Net MOB ae fom Bipolar or Negative Output Voltage Rosean ‘The circuit of Figure 22 is varistion from the standard volt 29@ output circuit and will produce bipolar output signals. A create ig t0 2.5 £82 (or a0 to -8.0volt output ran Positive current may be sourced into the summing node to offset This wplcSion provides tomeahat lower soase ts retousy the output voltage in the negative direction. For example, if discumed in the Outout Voltage Range swction of the General approximately 1-0 mA is used a bipoter output signa results which information, may be described as a &-bit "1's" complement offset binary. Veet may be used as this auxiliary reference. Note that Rg has bao doubled to 10 Kilohms becouse of the anticipated 20 Vip-p) output range TO sSSsSsSsSSSsSsssSsssssssssSsssssss MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA 6-24

APPLICATIONS INFORMATION (continued) Ca vorvol vor wn | | = = = vee ~ Variation i elaon to ly4- 11g ean never be negative ae eyoaseies | Ld necessary = J dhde Irs FIGURE 25 ~ PROGRAMMABLE GAIN AMPLIFIER OR oo Be ¢ Yeah ad to L 5 ° = ddd genase re vor Fay POU = {837 | ve {*} [ata ~ aves oo MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA 6-25

Product Information

MC1508 specifications and overview.

Summary

EIGHT-BIT MULTIPLYING DIGITAL-TO-ANALOG CNOVERTER

Description

EIGHT-BIT MULTIPLYING DIGITAL-TO-ANALOG CNOVERTER

Source title MC1508 Datasheet(PDF) - Motorola, Inc

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