Quad 8-Bit Voltage Out CMOS DAC a Complete with Internal 10 V Reference DAC8426 FEATURES offering a 25 ppm/C temperature coefficient and 5 mA of exter- No Adjustments Required, Total Error 61 LSB Max nal load driving capability. Over Temperature The DAC8426 contains four 8-bit voltage-output CMOS D/A Four Voltage-Output DACs on a Single Chip converters on a single chip. A 10 V output bandgap reference Internal 10 V Bandgap Reference sets the output full-scale voltage. The circuit also includes four Operates from Single 115 V Supply input latches and interface control logic. Fast 50 ns Data Load Time, All Temperatures One of the four latches, selected by the address inputs, is loaded Pin-for-Pin Replacement for PM-7226 and AD7226, from the 8-bit data bus input when the write strobe is active Eliminates External Reference low. All digital inputs are TTL/CMOS (5 V) compatible. The APPLICATIONS on-board amplifiers can drive up to 10 mA from either a single Process Controls or dual supply. The on-board reference that is always connected Multichannel Microprocessor Controlled: to the internal DACs has 5 mA available to drive external devices. System Calibration Its compact size, low power, and economical cost-per-channel, Op Amp Offset and Gain Adjust make the DAC8426 attractive for applications requiring mul- Level and Threshold Setting tiple D/A converters without sacrificing circuit-board space. Sys- tem reliability is also increased due to reduced parts count. PMIs advanced oxide-based, silicon-gate, CMOS process al- GENERAL DESCRIPTION lows the DAC8426s analog and digital circuitry to be manufac- The DAC8426 is a complete quad voltage output D/A converter tured on the same chip. This, coupled with PMIs highly stable with internal reference. This product fits directly into any exist- thin-film R-2R resistor ladder, aids in matching and tempera- ing 7226 socket where the user currently has a 10 V external ture tracking between DACs. reference. The external reference is no longer necessary. The internal reference of the DAC8426 is laser-trimmed to 0.4% FUNCTIONAL BLOCK DIAGRAM REV. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 617/329-4700 Fax: 617/326-8703DAC8426SPECIFICATIONS (V = +15 V 6 10%, AGND = DGND = 0 V, V = 0 V, T = 558C to +1258C DD SS A applies for DAC8426AR/BR, T = 408C to +858C applies for DAC8426ER/EP/FR/FP/FS, unless otherwise noted.) A Parameter Symbol Conditions Min Typ Max Units STATIC PERFORMANCE Resolution N 8 Bits 1 Total Unadjusted Error TUE Includes Reference A, E 1 LSB B, F 2 LSB Relative Accuracy INL A, E 1/2 LSB B, F 1 LSB 2 Differential Nonlinearity DNL 1 LSB Full-Scale Temperature Coefficient TCG Includes Reference 25 ppm/C FS Zero Scale Error V 20 mV ZSE Zero Scale Error Temperature Coefficient TCV Dual Supply V = 5 V 10 V/C ZS SS REFERENCE OUTPUT Output Voltage V OUT No Load A, E 9.96 10.04 V REF B, F 9.92 10.08 V Temperature Coefficient TCV OUT 20 ppm/C REF Load Regulation LD I = 5 mA 0.02 0.1 %/mA REG L Line Regulation LN V 10% 0.008 0.04 %/V REG DD 3 Output Noise e rms f = 0.1 Hz to 10 Hz 3 10 V p-p n Output Current I OUT V OUT < 40 mV 5 7 mA REF REF DIGITAL INPUTS Logic Input 0 V 0.8 V INL Logic Input 1 V 2.4 V INH Input Current I V = 0 V or V 0.1 10 A IN IN DD 3 Input Capacitance C 48 pF IN POWER SUPPLIES 4 Positive Supply Current I 614 mA DD 4 Negative Supply Current I Dual Supply V = 5 V 4 10 mA SS SS 5 Power Dissipation P 90 210 mW DISS Power Supply Sensitivity P V = 5% 0.0002 0.01 %/% SS DD V = +15 V 6 10%, AGND = DGND = 0 V, V = 0 V, T = 558C to +1258C applies for ELECTRICAL CHARACTERISTICS DD SS A DAC8426AR/BR, T = 408C to +858C applies for DAC8426ER/EP/FR/FP/FS, unless otherwise noted. A 6 Parameter Symbol Conditions Min Typ Max Units DAC OUTPUT 3 Output Current (Source) I SOURCE Digital In = All Ones 10 mA OUT 3 Output Current (Sink) I SINK Digital In = All Zeroes V = 5 V 350 450 A OUT SS Minimum Load Resistance R Digital In = All Ones 2 k L(MIN) 3 DYNAMIC PERFORMANCE V Slew Rate SR 4 V/s OUT V Settling Time t To 1/2 LSB, R = 2 k 3 s OUT S L (Positive or Negative) Digital Crosstalk Q 10 nVs 3 SWITCHING CHARACTERISTICS Address To Write Setup Time t 0ns AS Address To Write Hold Time t 0ns AH Data Valid To Write Setup Time t 70 ns DS Data Valid To Write Hold Time t 10 ns DH Write Pulse Width t 50 ns WR NOTES 1 Includes Full-Scale Error, Relative Accuracy, and Zero Code Error. Note 1 LSB = 0.39% error. 2 All devices guaranteed monotonic over the full operating temperature range. 3 Guaranteed and not subject to production test. 4 Digital inputs V = V or V V and V OUT unloaded. IN INL INH OUT REF 5 P calculated by I V . DISS DD DD 6 Typicals represent measured characteristics at T = +25C. A Specifications subject to change without notice. 2 REV. C