Philips Semiconductors Linear Products Product specificationMC1508-8/1408-88-bit multiplying D/A converter737August 31, 1994 853-0935 13721DESCRIPTIONThe MC1508/MC1408 series of 8-bit monolithic digital-to-analogconverters provide high-speed performance with low cost. They aredesigned for use where the output current is a linear product of an8-bit digital word and an analog reference voltageFEATURES• Fast settling time — 70ns (typ)• Relative accuracy ±0.19% (max error)• Non-inverting digital inputs are TTL and CMOS compatible• High-speed multiplying rate 4.0mA/µs (input slew)• Output voltage swing +0.5V to –5.0V• Standard supply voltages +5.0V and –5.0V to –15V• Military qualifications pendingAPPLICATIONS• Tracking A-to-D converters• 2 1/2-digit panel meters and DVMs• Waveform synthesis• Sample-and-Hold• Peak detector• Programmable gain and attenuation• CRT character generation• Audio digitizing and decoding• Programmable power supplies• Analog-digital multiplication• Digital-digital multiplication• Analog-digital division• Digital addition and subtraction• Speech compression and expansion• Stepping motor drive modems• Servo motor and pen driversPIN CONFIGURATIONSF, N PackagesD Package1NCGNDVEECOMPENTOP VIEW1234567891011121314161512345678910111213141615VREF(–)IOMSB A1A2A3A4VREF(+)VCCA8 LSBA7A6A5A1 MSBA2A3A4A8 LSBA7A6A5VREF(–)VREF(+)COMPENNCGNDV–IOV+NOTE:1. SO and non-standard pinouts.ORDERING INFORMATIONDESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #16-Pin Ceramic Dual In-Line Package (CERDIP) -55 to +125°C MC1508-8F 0582B16-Pin Ceramic Dual In-Line Package (CERDIP) 0 to +70°C MC1408-8F 0582B16-Pin Plastic Dual In-Line Package (DIP) 0 to +70°C MC1408-8N 0406C16-Pin Small Outline (SO) Package 0 to +70°C MC1408-8D 0005DPhilips Semiconductors Linear Products Product specificationMC1508-8/1408-88-bit multiplying D/A converterAugust 31, 1994738BLOCK DIAGRAMCURRENT SWITCHES5 6 7 8 9 10 11 12MSB LSBREFERENCECURRENTAMPLIFIER1421316GNDCOMPENNPN CURRENT SOURCE PAIRA1A2A3A4A5A6A7A84BIASCURRENTR-2R LADDER15(+)(–)VREFVREFVCC3VEEIOCIRCUIT DESCRIPTIONThe MC1508/MC1408 consists of a reference current amplifier, anR-2R ladder, and 8 high-speed current switches. For manyapplications, only a reference resistor and reference voltage needbe added.The switches are non-inverting in operation; therefore, a high stateon the input turns on the specified output current component.The switch uses current steering for high speed, and a terminationamplifier consisting of an active load gain stage with unity gainfeedback. The termination amplifier holds the parasitic capacitanceof the ladder at a constant voltage during switching, and provides alow impedance termination of equal voltage for all legs of the ladder.The R-2R ladder divides the reference amplifier current intobinarily-related components, which are fed to the remainder currentwhich is equal to the least significant bit. This current is shunted toground, and the maximum output current is 255/256 of the referenceamplifier current, or 1.992mA for a 2.0mA reference amplifier currentif the NPN current source pair is perfectly matched.ABSOLUTE MAXIMUM RATINGSSYMBOL PARAMETER RATING UNITVCCPositive power supply voltage +5.5 VVEENegative power supply voltage –16.5 VV5 – V12Digital input voltage 0 to VCCVVOApplied output voltage –5.2 to +18 VI14Reference current 5.0 mAV14, V15Reference amplifier inputs VEE to VCCPDMaximum power dissipation,TA = 25°C (still-air)1F package 1190 mWN package 1450 mWD package 1080 mWTSOLDLead soldering temperature (10 sec) 300 °CTAOperating temperature range 300 °CMC1508 –55 to +125 °CMC1408 0 to +75 °CTSTGStorage temperature range -65 to +150 °CNOTES:1. Derate above 25°C, at the following rates: F package at 9.5mW/°C; N package at 11.6mW/°C; D package at 8.6mW/°CPhilips Semiconductors Linear Products Product specificationMC1508-8/1408-88-bit multiplying D/A converterAugust 31, 1994739DC ELECTRICAL CHARACTERISTICSPin 3 must be 3V more negative than the potential to which R15 is returned. VCC = +5.0VDC, VEE = –15VDC, VREF/R14 = 2.0mA unlessotherwise specified. MC1508: TA = –55°C to 125°C. MC1408: TA = 0°C to 75°C, unless otherwise noted.SYMBOLPARAMETERTEST CONDITIONSMC1508-8 MC1408-8UNITSYMBOLPARAMETERTEST CONDITIONSMin Typ Max Min Typ MaxUNITErRelative accuracyError relative to full-scaleIO, Figure 3±0.19 ±0.19 %tSSettling time1To within 1/2 LSB, in-cludes tPLH, TA = +25°C,Figure 470 70 nstPLHtPHLPropagation delay timeLow-to-HighHigh-to-LowTA = +25°C, Figure 4 35 100 35 100 nsTCIOOutput full-scale current drift –20 –20 ppm/°CVIHVILDigital input logic level (MSB)HighLowFigure 52.00.82.00.8VDCIIHIILDigital input current (MSB)HighLowFigure 5VIH = 5.0VVIL = 0.8V0–0.40.04–0.80–0.40.04–0.8mAI15Reference input bias current Pin 15, Figure 5 –1.0 –5.0 –1.0 –5.0 µAIOROutput current rangeFigure 5VEE = –5.0VVEE = –7.0V to –15V002.02.02.14.2002.02.02.14.2mAIOIO(min)Output currentOff-stateFigure 5VREF = 2.000V,R14 = 1000ΩAll bits low1.9 1.9902.14.01.9 1.9902.14.0mAµAVOOutput voltage complianceEr ≤ 0.19% atTA = +25°C, Figure 5VEE = –5VVEE below –10V–0.6+10–5.5,+10–0.55,+0.5–5.0,+0.5–0.6+10–5.5,+10–0.55,+0.5–5.0,+0.5VDCSRIREFReference current slew rate Figure 6 8.0 8.0 mA/µsPSRR(–)Output current power supplysensitivityIREF = 1mA 0.5 2.7 0.5 2.7 µA/VICCIEEPower supply current Positive NegativeAll bits low, Figure 5 +2.5–6.5+22–13+2.5–6.5+22–13mAVCCRVEERPower supply voltage range Positive NegativeTA = +25°C, Figure 5 +4.5–4.5+5.0–15+5.5–16.5+4.5–4.5+5.0–15+5.5–16.5VDCPDPower dissipationAll bits low, Figure 5VEE = –5.0VDCVEE = –15.0VDC3411017030534110170305mWNOTES:1. All bits switched.Philips Semiconductors Linear Products Product specificationMC1508-8/1408-88-bit multiplying D/A converterAugust 31, 1994740TYPICAL PERFORMANCE CHARACTERISTICSD-to-A TRANSFER CHARACTERISTICSI OUTPUT CURRENT (mA)O01.02.0(00000000) INPUT DIGITAL WORD (11111111)FUNCTIONAL DESCRIPTIONReference Amplifier Drive and CompensationThe reference amplifier input current must always flow into Pin 14.regardless of the setup method or reference supply voltage polarity.Connections for a positive reference voltage are shown in Figure 1.The reference voltage source supplies the full reference current.For bipolar reference signals, as in the multiplying mode, R15 can betied