SP D AC87 D ata Converter Line Complete Monolithic 12-Bit D /A Converter FEATURES • • • • • • • Single Chip Construction On-Board Output A mplifier Low Power Dissipation: 300 mW M onotonicity Guaranteed Over Temperature Guaranteed for Operation W ith ±12V Supplies Buried Zener • Reference ±1/2 LSB M ax Nonlinearity voltage variation. This same structure also reduces nonlinearities due to thermal transients as the various bits are switched; nearly all critical components operate at constant power dissipation. DESCRIPTION High stability, SiCr thin film resistors are trimmed with a fine-resolution laser, resulting in lower differential nonlinearity errors. A low noise, high stability, subsurface Zenerdiode is used to produce a reference voltage with excellent long-term stability, high external current capability and temperature drift characteristics that challenge the best discrete Zener references. The SP DA C87 is a 12-bit digital-to-analog converter with both a high stability voltage reference and output amplifier combined on a single monolithic chip. Innovative circuit design reduces the total power consumption to 300 mW, which not only improves reliability but also improves long-term stability. The SP DA C87 is available in a hermetically sealed ceramic package and is specified for –55ºC to +125ºC temperature operation. M IL-STD-883 processing is available. The SP DA C87 incorporates a fully differential, nonsaturating precision current switching cell structure, which provides greatly increased immunity to supply FUNCTIONAL DIAGRAM (M SB) BIT 1 24 V REF OUT 23 GA IN A DJUST 3 22 +V S 4 21 COM M ON 20 SUM M ING JUNCTION 19 20V RA NGE 18 10V RA NGE 17 BIPOLA R OFFSET 16 REF INPUT 15 V OUT 1 BIT 2 2 BIT 3 BIT 4 BIT 5 5 BIT 6 6 BIT 7 7 BIT 8 8 BIT 9 9 REF CONTROL CIRCUIT 12-BIT RESISTER LA DDER NETW ORK A ND CURRENT SW ITCHES 5k 5k 6.3k – + BIT 10 10 BIT 11 11 14 – VS (LSB) BIT 12 12 13 NC 165Cedar Hill Street,Marlborough,MA01752 Tel:508.485.6350 Fax: 508.485.5168 www.SpectrumMicrowave.com SP DAC87 SPECIFICATIO N S A BSOLUTE M A XIM UM RA TINGS +V s to Power Ground –V s to Power Ground Digital Input (Pins 1 to 12) to Power Ground Ref In to Reference Ground Bipolar Offset to Reference Ground 10V Span R to Reference Ground 20V Span R to Reference Ground Ref Out (TA = +25ºC, rated power supplies unless otherwise noted.) M ODEL SP DA C87 M IN DIGITA L INPUT Binary - CBI Logic Levels (TTL Compatible) V IH (Logic " 1" ) +2.0 V IL (Logic " 0" ) 0 I IH (V IH = 5.5V ) I IH (V IL = 0.8V ) TRA NSFER CHA RA CTERISTICS A CCURA CY Linearity Error @ +25º T A @T min to T max Differential Linearity Error @ +25ºC T A @T min to T max Gain Error 2 Offset Error 2 Temperature Range for Guaranteed M onotonicity –55 DRIFT (T min to T max ) Total Bipolar Drift, max (includes gain, offset, and linearity drifts) Total Error (T min to T max ) 4 Unipolar ±0.18 Bipolar ±0.14 Gain Including Internal Reference Excluding Internal Reference Unipolar Offset Bipolar Offset CONV ERSION SPEED Settling Time to ±0.01% of FSR for FSR change (2 k Ohm/500 pF load) with 10 k Feedback with 5 k Feedback For LSB Change Slew Rate 10 0V to +18V 0V to –18V –1.0V to +7V ±12V ±12V ±12V ±24V Indefinite Short to Power Ground or +V s TY P ±1/2 ±0.1 ±0.05 ±0.3 ±0.24 3 2 1 MAX UNITS 12 Bits +5.5 +0.8 250 100 V V µA µA ±1/2 ±3/4 ±3/4 ±1 ±0.2 ±0.1 LSB 1 LSB LSB LSB % FSR 3 % FSR 3 +125 ºC ±30 ppm of FSR/ºC % of FSR % of FSR ±20 ±10 ±3 ±10 ppm ppm ppm ppm 4 3 µs µs µs V /µs of of of of FSR/ºC FSR/ºC FSR/ºC FSR/ºC Continued on next page. SP DAC87 (TA = +25ºC, rated power supplies unless otherwise noted.) M ODEL SP DA C87 M IN A NA LOG OUTPUT Ranges - CBI Output Current Output Impedance (dc) Short Circuit Current Internal Reference V oltage (V r) Output Impedance M ax External Current 6 Tempco of Drift TY P ±2.5. ±5, ±10 +5,+10 TEM PERA TURE RA NGE Specification Operating Storage UNITS V ±5 mA 0.05 +6.23 +6.3 1.5 POW ER SUPPLY SENSITIV ITY ±15V ±10% , 5V supply when applicable ±12V ±5% POW ER SUPPLY REQUIREM ENTS Rated V oltages Range A nalog Supplies Logic Supplies Supply Drain +12, +15V –12, –15V MAX 40 +6.37 mA V +2.5 ±10 mA ppm of V R /ºC ±0.002 ±0.002 % of FSR/% V s % of FSR/% V s ±16.5 +5.5 V V ±15V ±11.4 7 +4.5 5 14 –55 –55 –55 10 20 mA mA +125 +125 +150 ºC ºC ºC NOTES 1. Least Significant Bit. 2. A djustable to zero with external trim potentiometer. 3. FSR means " Full Scale Range" and is 20V for the ±10V range and 10V for the ±5V range. 4. Gain and offset errors adjusted to zero at +25ºC. 5. C F = 0, see Figure 1. 6. M aximum with no degradation of specifications, must be a constant load. 7. A minimum of ±12.3V is required for a ±10V full scale output and ±11.4V is required for all other voltage ranges. Specifications subject to change without notice. Continued on next page. SP DAC87 ORDERING INFORM A TION M ODEL LINEA RITY TEM PERA TURE SCREENING ERROR RA NGE SP DA C87- ±1/2 LSB – 55º C to +125º C M IL-STD-883C CBI-V /B Q D A J L B G H S E F C SY M BOL A B C D E F G H J L Q S a INCHES .180 .018 .012 1.27 .535 .615 .070 .110 .225 .150 .045 .090 15º Consult factory for application information.