NAPC/ SIGNETICS Signetics Linear Products DESCRIPTION The MG3410 series are 10-bit Multiply- ing Digital-to-Analog Converters. They are capable of high-speed performance, and are used as general-purpose. build- ing blocks in cost-effective D/A sys- tems. The Signetics' design provides complete 10-bit accuracy without laser trimming, and guaranteed monotonicity over tem- perature. Segmented current sources, in conjunction with an R-2R DAC provides the binary weighted currents. The output buffer amplifier and voltage reference have been omitted to allow greater speed, lower cost, and maximum user flexibility. FEATURES 10-bit resolution and accuracy (0.05%) Guaranteed monotonicity over temperature Fast settling time 250ns typical BLOCK DIAGRAM LOE D MM 6653924 OOS?re 6 MBSIC3 MC3440, MC3540, MC3410C TSI-M-10 {0-Bit High-Speed Multiplying D/A Converter Product Specification @ Digital inputs are TTL and CMOS PIN CONFIGURATION compatible . F Package. Wide output voltage compliance range y = Veee* e High-speed multiplying input slew ee 18] Veer rate 20mA/ps ono (2! 15] Vace~ Reference amplifier internally- oureur [3 fa] Vee compensated Oo; mse) [4] 73} D1 (LSB) Standard supply voltages +5V 02 [5 1] Oy and -15V 03 (8) [13] Og APPLICATIONS Er HS] Or @ Successive approximation A/D po} Oe converters TOP VIEW e High-speed, automatic test TOP VIEW corieses equipment e High-speed modems e Waveform generators CRT displays Strip CHART and X-Y plotters Programmable power supplies Programmable gain and attenuation MSB tsa O1 D2 D3 04 Ds Cy Oy De Dg Oro te {s fe f fe fa fro fur fia tia o p35 CURRENT SWITCHES LT ETT oy LADDER TERMINATORS Lit ttt yy R-2R LADDER 16 7 Vrer +}O 15] Vree(=)O || ews CIRCUITRY REFERENCE 14 CURRENT Lo Vee AMPLIFIER fF Vee GND EDOSSEGS November 14, 1986 5-129 853-0936 86554NAPC/ SIGNETICS Signefics Linear Products BBE D MM 66539924 0045773 T MMSIC3 Product Specification 40-Bit High-Speed Muitiplying D/A Converter MC3410, MC3540, MC3440C ORDERING INFORMATION DESCAIPTION TEMPERATURE RANGE ORDER CODE 16-Pin Cerdip 0 to +70C MG3410F 16-Pin Cerdip 0 to +70C MC3410CF 16-Pin Cerdip =55C to + 125C MC3510F ABSOLUTE MAXIMUM RATINGS T, = + 25C unless otherwise. noted SYMBOL PARAMETER RATING UNIT Voc Power supply +7.0 Voc Vee -18 Voc Mi Digital input voltage +15 Voc Vo Applied output voltage 0.5, -5.0 Voc IReF(1e) | Reference current 2.5 mA Vac Reference amplifier inputs Veo: VEE Vpc. Vaerio) | Reference amplifier differential inputs 0.7 Voc Ta Operating ambient temperature range MC3510 -55 to +125 MC3410, 3410C 0 to +70 C T Junction temperature, ceramic 4 package +150 C Pp Maximum power dissipation, Ta = 25C (still-air)! _F package 1190 mW NOTE: 1. Derate above 25C, at the following rates: F package at 9.5mW/C November 14, 1986 5-130 T-S1-09-0NAPC/ SIGNETICS Signetics Linear Products 40-Bit High-Speed Multiplying D/A Converter LOE D MM GE53924 OO4S774 1 MSICS Product Specification MC3410, MC3540, MC3440C T-Sl-09-/0 Vrer Rie =2.0mA, all digital inputs at high DC AND AC ELECTRICAL CHARACTERISTICS Voc= +5.0Vpc, Vee = - 15p0, logic tevel. MC3510: Ta =-55C to + 125C, MC3410 Series: Ta=0C to + 70C, unless otherwise noted, - MC3410, MC3510 MC3410C SYMBOL PARAMETER TEST CONDITIONS UNIT Min | Typ | Max | Min | Typ | Max - +0.05 +01 % E, Relative accuracy Ta = 25C (error relative to full-scale 19) VM Yo Lss Relative accuracy drift : , TCE, (relative to full-scale Io) 26 26 ppm/*C Monotonicity Over temperature 10 10 Bits Settling time to within + Y2 LSB _ one 's {all bits LOW-to-HIGH) Ta = 28C 260 250 ns teLy . . = 905 35 35 teu. Propagation delay time Ta = 25C 20 20 ns TClo Output full scale current drift 60 70 ppm/G Digital input logic levels (all bits) Vin HIGH-level, Logic "1" 20 20 Voc LOW-level, Logic 'o" . 0.8 0.8 Digital input current (all bits) hy HIGH-level, Viy = 5.5V +.04 +.04 mA It LOW-level, Vi, = 0.8V 0,05 | -0.4 -0.05 | ~0.4 IREE(15) Reference input bias current (Pin 15) -1.0 | -5.0 -1.0 | -5.0 pA lon Output current range 4.0 5.0 4.0 5.0 mA . . Vrer = 2.000V, lou Output current (ali bits high) Fig = 10002 3.8 |3.996|) 4.2 3.8 | 3.996] 4.2 mA lov Output current (all bits fow} Ta = 25C 0 2.0 0 4.0 BA on _ one =2.5 ~2.5 Vo Oufput voltage compliance Ta = 25C *02 +02 Voc SR Ire Reference amplifier stew rate 20 20 mA/ys ST Sree Reference amplifier settling time 0 to 4.0mA, 0.1% 2.0 2.0 ys PSRA(-) | Output current power supply sensitivity 0.003 } 0.01 0.003 | 0.02 1% Co Output capacitance Vo =0 25 25 pF Digital input capacitance G fall bits high) 4.0 4.0 PF lec Power supply current +18 +18 mA lee (all bits tow) | -11.4] -20 -11,.4} -20 Voc _ one +4,75 +5.0 |+5.25}+4.75} +5.0 | +5.25 Veg Power supply voltage range Ta= 25C |_44.96| -15 |-15.78|-14.25| -15 |-15.75| 0 Power consumption (all bits low) 220 | 380 220 | 380 mw (all bits high) 200 200 November 14, 1986 5-131NAPC/ SIGNETICS D8E D MM bSa924 OONS77S 3 MMSTCA Signetics Linear Products Product Specification 40-Bit High-Speed Multiplying MC3440, MC3540, MC3410C D/A Converter ' : 7-S1-09-10 @ 40 3 2 30 < w & Q 20 - at 5 g Vees -15.0V a 10 +Voc= +5 & Ta=25C > ~Vee= - 18 2 iaer =2mA y 0 =2mA e % -10 E gs -4 2 z 5 = -20 6 8 p -3.0 2 5 -40 - -3 -101 3 5 SB = ~78-80-25 0 28 50 75 100 125 COMPLIANCE VOLTAGE (VOLTS) Ta (*C) OP 196903 OP 126405 Figure 2. Maximum Output Compliance Figure 1. Output Current vs Output Compliance Voltage Voltage vs Temperature 18.0 1 Wot rr 16.0 PP RIS = R16 = 1.0K 140 |acunve Waer(-)= OV 12.0 | SMALL-SIGNAL BW 10.0 }rg=1002 8.0 |Vaer(+)}=50 mVpp 6.0 | CENTERED AT + 200mv, Veo= +5V RELATIVE OUTPUT (d8) nw o lec, fee. POWER SUPPLY CURRENT (mA) ~Vees ~ 18V 40 =2mA x 0 ot ~2.0 [ a curve 4.0 F- LARGE SIGNAL BW ~6.0 [ig 200 | ~8.0 [ Vaer(4+)=2Vop ) =10 [ cenTene af+ yov-T NT ~18-50-25 0 25 0 75 100 125 0.4 0.203085 0 2.03.0 5.0 10 Ta (*C) f, FREQUENCY (MHz) OPiS OPISGSOS Figure 3. Power Supply Current vs Temperature Figure 4. Reference Amplifier Frequency Response November 14, 1986 5-182 |NAPC/ SIGNETICS Signetics Linear Products 40-Bit High-Speed Multiplying D/A Converter VBE D MM GbS3924 OOYS77b S Product Specification MC3410, MC35410, MC3440C CIRCUIT DESCRIPTION The MC3410 consists of four segment cur- rent sources which generate the two most significant bits (MSBs), and an R-2R DAG implamented with ion-implanted resistors for scaling the remaining eight least. significant bits (LSBs) (See Figure 5). This approach provides coniplete 10-bit accuracy without trimming. The individual bit currents are switched ON or OFF by fully differential current switches. The switches use current steering for speed. An on-chip high-slew reference current ampli- fier drives the R-2R ladder and segment decoder. The currents are scaled in such a way that, with all bits on, the maximum output current is two times 1023/1024 of the refer- ence amplifier current, or nominally 3.996mA for a 2.000mA reference input current. The reference amplifier allows the user to provide a voltage input. Out-board resistor Rig (see Figure 6) converts this voltage to a usable current. A current mirror doubles this refer- ence current and feeds it to the segment decoder and resistor ladder. Thus, for a reference voltage of 2.0V and a 1kQ. resistor tied to Pin 16, the full-scale currentis approxi- mately 4.0mA. This relationship will remain regardiess of the reference voltage polarity, Connections for a positive reference voltage are shown in Figure 6a. For negative refer- ence voltage inputs, or for bipolar reference voltage inputs in the multiplying mode, Ris can be tied to a negative voltage correspond- ing to the minimum input level. For a negative. reference input, Rig should be grounded (Figure 6b). In addition, the negative voltage reference must be at least 3V above the Veg supply voltage for best operation. Bipolar input signals may be handled by connecting Rig to a positive voltage equal to the peak positive input fevel at Pin 15. When a DC reference voltage is used, capaci- tive bypass to ground is recommended. The 5V logic supply is not recommended. as a reference voltage. If a well regulated 5,0V supply, which drives logic, is to be used as the reference, Ry should be decoupled by T-St 09-70 connecting it to the +5.0V logic supply through another resistor and bypassing the junction of the two resistors with a 0.1uF capacitor to ground. The reference amplifier is internally-compen- sated with a i0pF feed-forward. capacitor, which gives it its high slew rate and fast settling time. Proper phase margin is main- tained with all possible values of Rig and reference voltages which supply 2.0mA refer- ence current into Pin 16. The reference current can also be supplied by a high imped- ance current source of 2.0mA. As Rig in- creases, the bandwidth of the amplifier de- creases slightly and settling time increases. For a current source with a dynamic output impedance of 1.0MQ2, the bandwidth of the reference amplifier is approximately half what it is in the case of Rig = 1.0kQ, and settling time is 10us. The reference amplifier phase margin decreases as the current source value dcreases in the case of a current source reference, so that the minimum reference current supplied from a current source is 0.5mA for stability. (4) (13) MSB 8 n ) 0) (10) ay (12) LSB Dy D2 03 Oa Os Oe Dy Oe Dy DF 9 9 9 9 f 9 9 9 9 9 GNO (3 = lour 3 3 } 3 3 J f } @ SEGMENT -4 im vj \-4 \-4 - ~ DECODER = Vers | || (INTERNAL) o . 2k 2A 2p 2A 2R 2 2R band MA AA WAY bh R CODE SELECTED 0111110011 Vee (1) LoC82acS: Figure 5. MC3410 Equivalent Circuit November 14, 1986 5-133 mESIC3NAPC/ SIGNETICS Signetics Linear Products 40-Bit High-Speed Multiplying D/A Converter L8E D MM bbS3924 0045777 7 MESIC Product Specification MC34410, MC3540, MC3410C Val+} 0, THROUGH Dio D1, THROUGH O19 Vee a. Positive Reference Voltage b. Negative Reference Voltage Figure 6, Basic Connections Rug + A= Ris = Race Rr<< Rig fo F.S.=2 In = Vace/Rree Teziecs Rig + Rr =A Rr<-< Ris Veer = Vee +3V Tee211ss OUTPUT VOLTAGE COMPLIANCE The output voltage compliance ranges. from -2.5 to +0.2V. As shown In Figure 2, this compliance range Is nearly constant over temperature. At the temperature extremes, however, the compliance voltage may be reduced if Vee > -15V. ACCURACY Absolute accuracy is a measure of each output current level with respect to its intend- November 14, 1986 ad value. It is dependent upon relative accu- racy and full-scafe current drift. Relative accu- tracy, or linearity, is the measure of each output current with respect. to its intended fraction of the full-scale current. The relative accuracy of the MC3410 is fairly constant over temperature due to the excellent tem- perature tracking, of the implanted resistors. The full-scale current from the reference amplifier may drift with temperature causing a change in the absolute accuracy. However, the MC3410 has a low full-scale current drift with temperature. 5-134 7-S1-07-/0 The MCG3510 and the MG3410 are. accurate to within 0.05% at 25C with a reference current of 2.0mA on Pin 16. MONOTONICITY The MG3410, MC3510 and MC3410G are guaranteed monotonic over temperature. This means that for every increase in the Input digital code, the output current either remains the same or increases but never decreases, In the multiplying mode, where reference input current will vary, monotonicity can be assured if the reference input current remains above 0.5mA. SETTLING TIME The worst-case switching condition occurs when all bits are switched "on," which corre- sponds to a low-to-high transition for all bits, This time is typically 250ns for the output to settle to within + 2 LSB for 10-bit accuracy, and 200ns for 8-bit accuracy, The turn-off time is typically 120ns. These times apply when the output swing is limited to a small (<0.7V) swing and the external output ca- pacitance is under 25pF. The major carry (MSB off-to-on, all others on- to-off} settles in approximately the same time as when all bits are switched off-to-on. lf a load resistor of 625Q is connected to ground, allowing the output to swing to ~2.5V, the settling time increases to 1.5ys. Extra care must be taken in board. layout as this is usually the dominant factor in satisfac- tory test results when measuring settling time. Short leads, 100uF supply bypassing, and minimum scope lead length are all necessary. A typical test setup for measuring settling time is shown in Figure 7. The same setup for the most part can be used to measure the slew rate of the reference amplifier (Figure 9) by tying all data bits high, pulsing the voltage reference input between 0 and 2V, and using a 500Q load resistor R,.NAPC/ SIGNETICS Signetics Linear Products VBE D MH GbS3924 OONS778 9 MBSTCS Product Specification 40-Bit High-Speed Muitiplying D/A Converter MC3410, MC3510, MC3440C T-S1-09-10 RISE ANO FALL TIMES < 10ns 2.4V fT 14V 0.4V 0.5V Vo o ty 250ns TYPICAL TO +12 LSB USE A, TO GNO FOR TURN-OFF MEASUREMENT FOR SETTLING TIME MEASUREMENT, (ALL BIT SWITCHED LOW TO HIGH) WEat1008 Figure 7. Settling Time Vee O1nF = RISE ANDO FALL TIMES < 10ns 14 24avE- 16 tk +2Vde Yi / \ oaVv Nemes 15 ik. Tt" mcasio ~ C3410 3 Vo OV poamennsany Cty Vo Ne 20 = 80mV + 2 = - | 1 > teLH feo 0.14F FOR PROPAGATION al DELAY TIME - L - WF2HISS Vee TO22190$ Figure & Propagation Delay Time November 14, 1986 5-135NAPC/ SIGNETICS Signetics Linear Products : 10-Bit High-Speed Multiplying D/A Converter LAE D MM 6653924 0045779 O MBSIC3 MC3410, MC3510, MC3410C TF Sl- 09:10 Veo 9 oar it nL > Vage( +). _ 4 an? mn? . . po iS 4 20V AS o-~! is. th al Veeet+) po OAF . 4 s I . mcasin > oF] wecaato us = o.8v O79 3 5005 o~ x ~~ OVo ... Ve : 12 Q O45 a oe 2 28pF tes dee THRIGAL - roy = . USE A, =200 TO GNO FOR 7 >= = SLEW RATE MEASUREMENT O.12F Wrai1208 Vee Toz2 1408 Figure 9. Reference Amplifier Settling Time and Slew Rate TYPICAL APPLICATIONS aP eus CONTROL SIGNAL FROM pP OUTPUT LATCH 412 LS378 OATA jr- 2 {| | Os~ Onl WE1108 THE VALID DATA WILL BE LATCHEO TO THE DAC UNTIL UPDATED WITH E2 PULSE. TIMING WILL DEPEND ON THE PROCESSOR USED. Figure 10, Interfacing 10-Bit DAC With 8-Bit Microprocessor November 14, 1986 5-136