DAC08CP

8-Bit, High Speed, Multiplying D/A Converter DAC08 Data Sheet FEATURES Direct interface to all popular logic families with full noise immunity is provided by the high swing, adjustable threshold logic input. Fast settling output current: 85 ns Full-scale current prematched to ±1 LSB Direct interface to TTL, CMOS, ECL, HTL, PMOS Nonlinearity to 0.1% maximum over temperature range High output impedance and compliance: −10 V to +18 V Complementary current outputs Wide range multiplying capability: 1 MHz bandwidth Low FS current drift: ±10 ppm/°C Wide power supply range: ±4.5 V to ±18 V Low power consumption: 33 mW at ±5 V Low cost High voltage compliance complementary current outputs are provided, increasing versatility and enabling differential operation to effectively double the peak-to-peak output swing. In many applications, the outputs can be directly converted to voltage without the need for an external op amp. All DAC08 series models guarantee full 8-bit monotonicity, and nonlinearities as tight as ±0.1% over the entire operating temperature range are available. Device performance is essentially unchanged over the ±4.5 V to ±18 V power supply range, with 33 mW power consumption attainable at ±5 V supplies. GENERAL DESCRIPTION The compact size and low power consumption make the DAC08 attractive for portable and military/aerospace applications; devices processed to MIL-STD-883, Level B are available. The DAC08 series of 8-bit monolithic digital-to-analog converters provide very high speed performance coupled with low cost and outstanding applications flexibility. DAC08 applications include 8-bit, 1 µs A/D converters, servo motor and pen drivers, waveform generators, audio encoders and attenuators, analog meter drivers, programmable power supplies, LCD display drivers, high speed modems, and other applications where low cost, high speed, and complete input/output versatility are required. Advanced circuit design achieves 85 ns settling times with very low glitch energy and at low power consumption. Monotonic multiplying performance is attained over a wide 20 to 1 reference current range. Matching to within 1 LSB between reference and full-scale currents eliminates the need for full-scale trimming in most applications. FUNCTIONAL BLOCK DIAGRAM V+ 13 VLC (MSB) B1 1 5 B2 6 B3 7 B4 B5 8 9 B6 10 B7 11 (LSB) B8 12 DAC08 VREF (+) VREF (–) BIAS NETWORK CURRENT SWITCHES 14 4 2 IOUT IOUT 15 16 3 COMP V– 00268-C-001 REFERENCE AMPLIFIER Figure 1. Rev. D Document Feedback 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 that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2002–2016 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com DAC08 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1  Application Information ................................................................ 14  General Description ......................................................................... 1  Reference Amplifier Setup ........................................................ 14  Functional Block Diagram .............................................................. 1  Revision History ............................................................................... 2  Reference Amplifier Compensation for Multiplying Applications ................................................................................ 14  Specifications..................................................................................... 3  Logic Inputs................................................................................. 14  Electrical Characteristics ............................................................. 3  Analog Output Currents ........................................................... 14  Typical Electrical Characteristics ............................................... 4  Power Supplies ............................................................................ 15  Absolute Maximum Ratings............................................................ 5  Temperature Performance......................................................... 15  Thermal Resistance ...................................................................... 5  Multiplying Operation ............................................................... 15  ESD Caution .................................................................................. 5  Settling Time ............................................................................... 15  Pin Configuration and Function Descriptions ............................. 6  Analog Devices Current Output DACs ....................................... 17  Test and Burn-In Circuits ................................................................ 7  Outline Dimensions ....................................................................... 18  Typical Performance Characteristics ............................................. 8  Ordering Guide .......................................................................... 19  Basic Connections .......................................................................... 11  REVISION HISTORY 3/16—Rev. C to Rev. D Added Thermal Resistance Section ............................................... 5 Changes to Table 4 ............................................................................ 5 Change to Figure 29 ....................................................................... 12 Updated Outline Dimensions ....................................................... 18 Changes to Ordering Guide .......................................................... 10 2/02—Rev. A to Rev. B Edits to Specifications .......................................................................2 Edits to Absolute Maximum Ratings ..............................................3 Edits to Ordering Guide ...................................................................3 Edits to Wafer Test Limits ................................................................5 Edit to Figure 13 ................................................................................8 Edits to Figures 14 and 15 ................................................................9 11/04—Rev. B to Rev. C Changed SO to SOIC ......................................................... Universal Removed DIE ...................................................................... Universal Changes to Figure 30, Figure 31, Figure 32 ................................. 12 Change to Figure 33 ....................................................................... 15 Added Table 4.................................................................................. 16 Updated Outline Dimensions ....................................................... 17 Changes to Ordering Guide .......................................................... 18 Rev. D | Page 2 of 21 Data Sheet DAC08 SPECIFICATIONS ELECTRICAL CHARACTERISTICS VS = ±15 V, IREF = 2.0 mA, –55°C ≤ TA ≤ +125°C for DAC08/DAC08A, 0°C ≤ TA ≤ +70°C for DAC08E and DAC08H, −40°C to +85°C for DAC08C, unless otherwise noted. Output characteristics refer to both IOUT and IOUT. Table 1. Parameter RESOLUTION MONOTONICITY NONLINEARITY SETTLING TIME PROPAGATION DELAY Each Bit All Bits Switched FULL-SCALE TEMPCO1 DAC08A/DAC08H Symbol Test Conditions/Comments Min Typ Max 8 8 NL ±0.1 tS To ±1/2 LSB, all bits switched 85 135 on or off, TA = 25°C 1 tPLH tPHL TCIFS TA = 25°C1 35 35 ±10 DAC08E DAC08C Min Typ Max Min Typ Max 8 8 8 8 ±0.19 ±0.39 85 150 85 150 60 60 ±50 35 35 ±10 DAC08E OUTPUT VOLTAGE Compliance (True Compliance) VOC FULL RANGE CURRENT IFR4 FULL RANGE IFRS SYMMETRY ZERO-SCALE CURRENT IZS OUTPUT CURRENT IOR1 RANGE IOR2 OUTPUT CURRENT NOISE LOGIC INPUT LEVELS Logic 0 Logic 1 LOGIC INPUT CURRENT Logic 0 Logic 1 LOGIC INPUT SWING LOGIC THRESHOLD RANGE REFERENCE BIAS CURRENT REFERENCE INPUT SLEW RATE VIL VIL IIL IIH VIS VTHR Full-scale current Change 20 MΩ typ VREF = 10.000 V R14, R15 = 5.000 kΩ TA = 25°C IFR4 − IFR2 R14, R15 = 5.000 kΩ VREF = +15.0 V, V− = −10 V VREF = +25.0 V, V− = −12 V IREF = 2 mA ns ns ppm/°C −10 +18 –10 +18 V 1.984 1.992 2.000 1.94 1.99 2.04 1.94 1.99 2.04 mA ±0.5 ±4 ±1 ±8 ±2 ±16 µA 0.1 1 0.2 2 0.2 4 2.1 2.1 2.1 µA mA 4.2 4.2 4.2 mA 25 25 0.8 2 REQ = 200 Ω RL = 100 Ω CC = 0 pF. See Figure 7.1 60 60 ±80 +18 4 25 0.8 2 nA 0.8 V V 2 −2 0.002 −10 −2 10 0.002 +18 −10 +13.5 −10 −10 −2 10 0.002 +18 −10 +13.5 −10 −10 10 +18 +13.5 µA µA V V −1 −3 −3 −3 µA −10 −10 I15 dI/dt 35 35 ±10 −10 VLC = 0 V VLC = 0 V VIN = −10 V to +0.8 V VIN = 2.0 V to 18 V V− = −15 V VS = ±15 V1 60 60 ±80 ±50 Unit Bits Bits %FS ns 8 Rev. D | Page 3 of 21 −1 4 8 −1 4 8 mA/µs DAC08 Parameter POWER SUPPLY SENSITIVITY POWER SUPPLY CURRENT POWER DISSIPATION 1 Data Sheet DAC08A/DAC08H DAC08E DAC08C Symbol Test Conditions/Comments Min Typ Max Min Typ Max Min Typ Max Unit PSSIFS+ V+ = 4.5 V to 18 V ±0.0003 ±0.01 ±0.0003 ±0.01 ±0.0003 ±0.01 %∆IO/ %∆V+ PSSIFS– V− = −4.5 V to −18 V ±0.002 ±0.01 ±0.002 ±0.01 ±0.002 ±0.01 %∆IO/ %∆V− IREF = 1.0 mA I+ VS = ±5 V, IREF = 1.0 mA 2.3 3.8 2.3 3.8 2.3 3.8 mA I− I+ I− I+ I− PD VS = +5 V, −15 V IREF = 2.0 mA VS = ±15 V IREF = 2.0 mA ±5 V, IREF = 1.0 mA +5 V, −15 V IREF = 2.0 mA ±15 V, IREF = 2.0 mA −4.3 2.4 −6.4 2.5 −6.5 33 −5.8 3.8 −7.8 3.8 −7.8 48 −4.3 2.4 −6.4 2.5 −6.5 33 −5.8 3.8 −7.8 3.8 −7.8 48 −4.3 2.4 −6.4 2.5 −6.5 33 −5.8 3.8 −7.8 3.8 −7.8 48 mA mA mA mA mA mW 108 136 103 136 108 136 mW 135 174 135 174 135 174 mW Guaranteed by design. TYPICAL ELECTRICAL CHARACTERISTICS VS = ±15 V, and IREF = 2.0 mA, unless otherwise noted. Output characteristics apply to both IOUT and IOUT. Table 2. Parameter REFERENCE INPUT SLEW RATE PROPAGATION DELAY SETTLING TIME Symbol dI/dt tPLH, tPHL tS Test Conditions/Comments TA = 25°C, any bit To ±1/2 LSB, all bits switched on or off, TA = 25°C Rev. D | Page 4 of 21 All Grades Typical 8 35 85 Unit mA/µs ns ns Data Sheet DAC08 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 3. Parameter Operating Temperature DAC08AQ, DAC08Q DAC08HQ, DAC08EQ, DAC08CQ DAC08CP, DAC08CS Junction Temperature (TJ) Storage Temperature Q Package Storage Temperature P Package Lead Temperature (Soldering, 60 sec) V+ Supply to V− Supply Logic Inputs VLC Analog Current Outputs (at VS− = 15 V) Reference Input (V14 to V15) Reference Input Differential Voltage (V14 to V15) Reference Input Current (I14) Rating −55°C to +125°C 0°C to +70°C −40°C to +85°C −65°C to +150°C −65°C to +150°C −65°C to +125°C 300°C 36 V V− to V− + 36 V V− to V+ 4.25 mA V− to V+ θJA is specified for worst case mounting conditions, that is, θJA is specified for device in socket for CERDIP, PDIP, and LCC packages; θJA is specified for device soldered to printed circuit board for SOIC package. Table 4. Thermal Resistance Package Type 16-Lead CERDIP (Q) 16-Lead PDIP (P) 20-Terminal LCC (RC) 16-Lead SOIC (S) ESD CAUTION ±18 V 5.0 mA Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operating conditions for extended periods may affect product reliability. Rev. D | Page 5 of 21 θJA 100 82 76 111 θJC 16 39 36 35 Unit °C/W °C/W °C/W °C/W DAC08 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS VLC 1 16 COMP IOUT 2 15 VREF (–) V– 3 14 VREF (+) DAC08 V+ TOP VIEW (MSB) B1 5 (Not To Scale) 12 B8 (LSB) 13 B2 6 11 B7 B3 7 10 B6 B4 8 9 B5 00268-C-002 IOUT 4 Figure 2. 16-Lead Dual In-Line Package (PDIP and CERDIP) V+ 1 16 VREF (+) 2 15 B7 VREF (–) 3 14 B6 B8 (LSB) DAC08 13 B5 TOP VIEW VLC 5 (Not To Scale) 12 B4 IOUT 6 11 B3 V– 7 10 B2 IOUT 8 9 B1 (MSB) 00268-C-003 COMP 4 NC COMP 3 2 1 VREF (–) IOUT VLC Figure 3. 16-Lead Standard Small Outline Package (SOIC_N) 20 19 V– 4 18 IOUT 5 TOP VIEW 16 NC (Not To Scale) 15 B8 (LSB) 14 B7 B6 B5 NC B3 B4 9 10 11 12 13 NC = NO CONNECT 00268-C-004 NC 6 (MSB) B1 7 B2 8 VREF (+) 17 V+ DAC08 Figure 4. DAC08RC/883 20-Terminal Ceramic Leadless Chip Carrier (LCC) Rev. D | Page 6 of 21 Data Sheet DAC08 TEST AND BURN-IN CIRCUITS +VREF RREF OPTIONAL RESISTOR FOR OFFSET INPUTS RL RIN 15 RL 2 16 00268-C-006 RP TYPICAL VALUES: RIN = 5kΩ +VIN = 10V NO CAP Figure 5. Pulsed Reference Operation C2 R1 = 9kΩ C1 = 0.001µF C2, C3 = 0.01µF +18V C1 R1 16 15 14 13 12 11 10 9 DAC08 1 2 3 4 5 6 7 8 C3 –18V MIN Figure 6. Burn-In Circuit Rev. D | Page 7 of 21 00268-C-007 0V 4 14 REQ ≈ 200Ω DAC08 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS ALL BITS SWITCHED ON 1V 2.4V 1V 2.5V 0.4V 0.5V –1/2LSB OUTPUT 0V SETTLING +1/2LSB –0.5mA –2.5mA 100mV 200ns REQ ≈ 200Ω RL = 100Ω CC = 0 50ns 10mV 200ns/DIVISION 50ns/DIVISION SETTLING TIME FIXTURE IFS = 2mA, RL = 1kΩ 1/2LSB = 4µA Figure 7. Fast Pulsed Reference Operation 00268-C-011 00268-C-008 IOUT Figure 10. Full-Scale Settling Time 5 TA = TMIN TO TMAX ALL BITS HIGH IFS, OUTPUT CURRENT (mA) IOUT 1.0mA IOUT 00268-C-009 2.0mA (0000|0000) 3 2 LIMIT FOR V– = –5V 1 0 (1111|1111) IREF = 2mA 4 0 Figure 8. True and Complementary Output Operation 5mV 1 5 2 3 4 IREF, REFERENCE CURRENT (mA) 00268-C-012 0mA LIMIT FOR V– = –15V Figure 11. Full-Scale Current vs. Reference Current 500 2V 2.4V PROPAGATION DELAY (ns) 400 0.4V 0V 8µA 200 1LSB = 7.8µA 100 1LSB = 61nA 0 50ns/DIVISION 0.005 0.01 0.02 0.05 0.10 0.20 0.50 1.00 2.00 IFS, OUTPUT FULL-SCALE CURRENT (mA) Figure 12. LSB Propagation Delay vs. IFS Figure 9. LSB Switching Rev. D | Page 8 of 21 5.00 10.00 00268-C-013 50ns 100mV 00268-C-010 0 300 Data Sheet DAC08 2.0 10 R14 = R15 = 1kΩ RL ≤ 500V ALL BITS ON VR15 = 0V 8 4 1.6 2 –2 1 0.8 CC = 15pF, VIN = 2.0V p-p CENTERED AT +1.0V LARGE SIGNAL –6 –8 –10 0.4 CC = 15pF, VIN = 50mV p-p CENTERED AT +200mV SMALL SIGNAL –12 –14 0.1 0.5 2.0 1.0 FREQUENCY (MHz) 0.2 10.0 5.0 0 –50 100 50 TEMPERATURE (°C) 0 150 Figure 16. VTH − VLC vs. Temperature Figure 13. Reference Input Frequency Response 4.0 4.0 TA = TMIN TO TMAX ALL BITS ON TA = TMIN TO TMAX ALL BITS ON 3.6 3.6 3.2 OUTPUT CURRENT (mA) 3.2 NOTE: POSITIVE COMMON-MODE RANGE IS ALWAYS (V+) –1.5V 2.8 2.4 V– = –15V V– = –5V V+ = +15V 2.0 IREF = 2mA 1.6 IREF = 1mA 1.2 0.8 2.8 2.4 V– = –15V V– = –5V IREF = 2mA 2.0 1.6 IREF = 1mA 1.2 0.8 IREF = 0.2mA 0 –14 –10 IREF = 0.2mA 0.4 –6 18 –2 2 6 10 14 V15, REFERENCE COMMON-MODE VOLTAGE (V) 00268-C-015 0.4 0 –14 –10 –6 –2 2 6 OUTPUT VOLTAGE (V) 10 14 18 00268-C-018 OUTPUT CURRENT (mA) 00268-C-017 –4 1.2 VTH–VLC (V) 2 0 00268-C-014 RELATIVE OUTPUT (dB) 6 Figure 17. Output Current vs. Output Voltage (Output Voltage Compliance) Figure 14. Reference Amplifier Common-Mode Range 28 10 24 20 OUTPUT VOLTAGE (V) 6 4 16 12 8 4 0 SHADED AREA INDICATES PERMISSIBLE OUTPUT VOLTAGE RANGE FOR V– = –15V. IREF ≤ 2.0mA. FOR OTHER V– OR IREF, SEE OUTPUT CURRENT VS. OUTPUT VOLTAGE CURVE. –4 2 0 –12 –8 –4 0 4 8 LOGIC INPUT VOLTAGE (V) 12 16 –12 –50 0 50 100 TEMPERATURE (°C) 150 Figure 18. Output Voltage Compliance vs. Temperature Figure 15. Logic Input Current vs. Input Voltage Rev. D | Page 9 of 21 00268-C-019 –8 00268-C-016 LOGIC INPUT (µA) 8 DAC08 Data Sheet 1.8 10 1.6 9 POWER SUPPLY CURRENT (mA) BITS MAY BE HIGH OR LOW 1.2 B1 1.0 IREF = 2.0mA 0.8 0.6 B2 0.4 B4 V– = –5V B5 B3 ���� V– = –15V 0 –12 –8 8 7 I– WITH IREF = 2mA 6 5 I– WITH IREF = 1mA 4 I– WITH IREF = 0.2mA 3 2 I+ 1 –4 0 4 8 LOGIC INPUT VOLTAGE (V) 12 16 0 0 –2 –10 –12 –14 –16 –8 –6 –4 V–, NEGATIVE POWER SUPPLY (V dc) –18 –20 00268-C-022 0.2 00268-C-020 OUTPUT CURRENT (mA) 1.4 NOTE: B1 THROUGH B8 HAVE IDENTICAL TRANSFER CHARACTERISTICS. BITS ARE FULLY SWITCHED WITH LESS THAN 1/2 LSB ERROR, AT LESS THAN ±100mV FROM ACTUAL THRESHOLD. THESE SWITCHING POINTS ARE GUARANTEED TO LIE BETWEEN 0.8V AND 2.0V OVER THE OPERATING TEMPERATURE RANGE (VLC = 0.0V). Figure 21. Power Supply Current vs. V− Figure 19. Bit Transfer Characteristics 10 10 ALL BITS HIGH OR LOW ALL BITS HIGH OR LOW POWER SUPPLY CURRENT (mA) 9 8 7 I– 6 5 4 3 I+ 2 1 8 7 V– = –15V 6 IREF = 2.0mA I– 5 4 3 V+ = +15V I+ 2 0 2 4 6 8 12 14 16 10 V+, POSITIVE POWER SUPPLY (V dc) 18 20 0 –50 0 50 100 TEMPERATURE (°C) 150 Figure 22. Power Supply Current vs. Temperature Figure 20. Power Supply vs. V+ Rev. D | Page 10 of 21 00268-C-023 1 0 00268-C-021 POWER SUPPLY CURRENT (mA) 9 Data Sheet DAC08 BASIC CONNECTIONS +VREF RREF IIN VIN IREF 14 RIN 15 IREF ≥ PEAK NEGATIVE SWING OF IIN RREF RREF ≈ R15 +V REF 14 R15 (OPTIONAL) VIN +VREF MUST BE ABOVE PEAK POSITIVE SWING OF VIN 00268-C-024 15 HIGH INPUT IMPEDANCE Figure 23. Accommodating Bipolar References LSB MSB B1 B2 B3 B4 B5 B6 B7 B8 VREF (+) 14 5 6 7 8 9 10 11 12 RREF (R14) VREF (–) IO 4 2 15 16 3 13 1 IO R15 V– V+ CC COMP 0.1µF +VREF 255 0.1µF × RREF 256 IO + IO = IFR FOR ALL LOGIC STATES IFR = V– V+ VLC FOR FIXED REFERENCE, TTL OPERATION, TYPICAL VALUES ARE: VREF = 10.000V RREF = 5.000kΩ R15 = RREF CC = 0.01µF VLC = 0V (GROUND) 00268-C-025 IREF +VREF IO IREF = 2.000mA EO 5.000kΩ 4 14 5.000kΩ 2 IO FULL RANGE HALF SCALE +LSB HALF SCALE HALF SCALE –LSB ZERO SCALE +LSB ZERO SCALE EO EO IO IO B1 B2 B3 B4 B5 B6 B7 B8 1 1 1 1 1 1 1 1 1.992 0.000 –9.960 –0.000 1 0 0 0 1 0 0 1 1.008 0.984 –5.040 –4.920 1 0 0 0 1 0 0 0 1.000 0.992 –5.000 –4.960 0 1 1 1 0 1 1 1 0.992 1.000 –4.960 –5.000 0 0 0 0 0 0 0 1 0.008 1.984 –0.040 –9.920 0 0 0 0 0 0 0 0 0.000 1.992 0.000 –9.960 EO Figure 25. Basic Unipolar Negative Operation 10V 10kΩ IO IREF = 2.000mA 4 14 EO 2 IO EO 10kΩ POS. FULL RANGE POS. FULL RANGE –LSB ZERO SCALE +LSB ZERO SCALE ZERO SCALE –LSB NEG. FULL SCALE +LSB NEG. FULL SCALE B1 B2 B3 B4 B5 B6 B7 B8 EO 1 1 1 1 1 1 1 1 –9.920 1 1 1 1 1 1 1 0 –9.840 1 0 0 0 0 0 0 1 –0.080 0.000 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 +0.080 0 0 0 0 0 0 0 1 +9.920 0 0 0 0 0 0 0 0 +10.000 Figure 26. Basic Bipolar Output Operation Rev. D | Page 11 of 21 EO +10.000 +9.920 +0.160 +0.080 0.000 –9.840 –9.920 00268-C-027 MSB LSB B1 B2 B3 B4 B5 B6 B7 B8 00268-C-026 Figure 24. Basic Positive Reference Operation LSB MSB B1 B2 B3 B4 B5 B6 B7 B8 DAC08 Data Sheet LOW T.C. 4.5kΩ VREF 10V 14 IREF (+) ≈ 2mA 39kΩ ≈1V 15 00268-C-028 10kΩ POT APPROX 5kΩ Figure 27. Recommended Full-Scale Adjustment Circuit RREF IO 14 IO R15 2 15 NOTE RREF SETS IFS; R15 IS FOR BIAS CURRENT CANCELLATION. –VREF RREF 00268-C-029 –VREF IFS ≈ 4 Figure 28. Basic Negative Reference Operation 10kΩ 5.0kΩ 15V VO REF01* 6 5.000kΩ IO +15V 4 5 POS. FULL RANGE EO ZERO SCALE NEG. FULL SCALE +1LSB NEG. FULL SCALE AD8671 5.0kΩ V+ –V CC VLC IO 2 B1 1 1 0 0 B2 1 0 0 0 4 +15V –15V –15V Figure 29. Offset Binary Operation RL IO 4 EO AD8671 IO 2 0 TO –IFR × RL 255 I 256 REF FOR COMPLEMENTARY OUTPUT (OPERATION AS A NEGATIVE LOGIC DAC). CONNECT INVERTING INPUT OF OP AMP TO IO (PIN 2): CONNECT IO (PIN 4) TO GROUND. 00268-C-031 IFR = Figure 30. Positive Low Impedance Output Operation 4 2 AD8671 IO IO RL EO 0 TO –IFR × RL IFR = 255 I 256 REF FOR COMPLEMENTARY OUTPUT (OPERATION AS A NEGATIVE LOGIC DAC). CONNECT NONINVERTING INPUT OF OP AMP TO IO (PIN 2): CONNECT IO (PIN 4) TO GROUND. Figure 31. Negative Low Impedance Output Operation Rev. D | Page 12 of 21 00268-C-032 *OR ADR01 B3 1 0 0 0 B4 1 0 0 0 B5 1 0 0 0 B6 1 0 0 0 B7 1 0 0 0 B8 1 0 1 0 EO +4.960 0.000 –4.960 –5.000 00268-C-030 2 10V LSB MSB B1 B2 B3 B4 B5 B6 B7 B8 Data Sheet DAC08 CMOS, HTL, NMOS V+ ECL TTL, DTL, VTH = 1.4V 20kΩ 13kΩ 9.1kΩ VLC VLC 1 6.2kΩ 2N3904 2N3904 2N3904 "A" 0.1µF 3kΩ 39kΩ TO PIN 1 VLC 6.2kΩ –5.2V 2N3904 3kΩ 20kΩ TO PIN 1 VLC R3 400µA TEMPERATURE COMPENSATING VLC CIRCUITS Figure 32. Interfacing with Various Logic Families Rev. D | Page 13 of 21 "A" 00268-C-033 VTH = VLC 1.4V 15V CMOS 15V VTH = 7.6V DAC08 Data Sheet APPLICATION INFORMATION REFERENCE AMPLIFIER SETUP The DAC08 is a multiplying D/A converter in which the output current is the product of a digital number and the input reference current. The reference current may be fixed or may vary from nearly zero to 4.0 mA. The full-scale output current is a linear function of the reference current and is given by I FR  255  I REF 256 where IREF = I14 In positive reference applications, an external positive reference voltage forces current through R14 into the VREF(+) terminal (Pin 14) of the reference amplifier. Alternatively, a negative reference may be applied to VREF(–) at Pin 15; reference current flows from ground through R14 into VREF(+) as in the positive reference case. This negative reference connection has the advantage of a very high impedance presented at Pin 15. The voltage at Pin 14 is equal to and tracks the voltage at Pin 15 due to the high gain of the internal reference amplifier. R15 (nominally equal to R14) cancels bias current errors; R15 may be eliminated with only a minor increase in error. Bipolar references may be accommodated by offsetting VREF or Pin 15. The negative common-mode range of the reference amplifier is given by VCM – = V− plus (IREF × 1 kΩ) plus 2.5 V. The positive common-mode range is V+ less 1.5 V. When a dc reference is used, a reference bypass capacitor is recommended. A 5.0 V TTL logic supply is not recommended as a reference. If a regulated power supply is used as a reference, R14 must be split into two resistors with the junction bypassed to ground with a 0.1 μF capacitor. For most applications, the tight relationship between IREF and IFS eliminates the need for trimming IREF. If required, full-scale trimming can be accomplished by adjusting the value of R14, or by using a potentiometer for R14. An improved method of fullscale trimming that eliminates potentiometer T.C. effects is shown in the recommended full-scale adjustment circuit (Figure 27). Using lower values of reference current reduces negative power supply current and increases reference amplifier negative commonmode range. The recommended range for operation with a dc reference current is 0.2 mA to 4.0 mA. REFERENCE AMPLIFIER COMPENSATION FOR MULTIPLYING APPLICATIONS AC reference applications require the reference amplifier to be compensated using a capacitor from Pin 16 to V−. The value of this capacitor depends on the impedance presented to Pin 14; for R14 values of 1.0 kΩ, 2.5 kΩ, and 5.0 kΩ, minimum values of CC are 15 pF, 37 pF, and 75 pF. Larger values of R14 require proportionately increased values of CC for proper phase margin, so the ratio of CC (pF) to R14 (kΩ) = 15. For fastest response to a pulse, low values of R14 enabling small CC values must be used. If Pin 14 is driven by a high impedance such as a transistor current source, none of the preceding values suffice, and the amplifier must be heavily compensated, which decreases overall bandwidth and slew rate. For R14 = 1 kΩ and CC = 15 pF, the reference amplifier slews at 4 mA/μs, enabling a transition from IREF = 0 to IREF = 2 mA in 500 ns. Operation with pulse inputs to the reference amplifier can be accommodated by an alternate compensation scheme. This technique provides lowest full-scale transition times. An internal clamp allows quick recovery of the reference amplifier from a cutoff (IREF = 0) condition. Full-scale transition (0 mA to 2 mA) occurs in 120 ns when the equivalent impedance at Pin 14 is 200 Ω and CC = 0. This yields a reference slew rate of 16 mA/μs, which is relatively independent of the RIN and VIN values. LOGIC INPUTS The DAC08 design incorporates a unique logic input circuit that enables direct interface to all popular logic families and provides maximum noise immunity. This feature is made possible by the large input swing capability, 2 μA logic input current, and completely adjustable logic threshold voltage. For V− = −15 V, the logic inputs may swing between −10 V and +18 V. This enables direct interface with 15 V CMOS logic, even when the DAC08 is powered from a 5 V supply. Minimum input logic swing and minimum logic threshold voltage are given by V− + (IREF × 1 kΩ) + 2.5 V The logic threshold may be adjusted over a wide range by placing an appropriate voltage at the logic threshold control pin (Pin 1, VLC). Figure 16 shows the relationship between VLC and VTH over the temperature range, with VTH nominally 1.4 above VLC. For TTL and DTL interface, simply ground Pin 1. When interfacing ECL, an IREF = 1 mA is recommended. For interfacing other logic families, see Figure 32. For general set-up of the logic control circuit, note that Pin 1 sources 100 μA typical; external circuitry must be designed to accommodate this current. Fastest settling times are obtained when Pin 1 sees a low impedance. If Pin 1 is connected to a 1 kΩ divider, for example, it must be bypassed to ground by a 0.01 μF capacitor. ANALOG OUTPUT CURRENTS Both true and complemented output sink currents are provided where IO + IO = IFS. Current appears at the true (IO) output when a 1 (logic high) is applied to each logic input. As the binary count increases, the sink current at Pin 4 increases proportionally, in the fashion of a positive logic DAC. When a 0 is applied to any input bit, that current is turned off at Pin 4 and turned on at Pin 2. A decreasing logic count increases IO as in a negative or inverted logic DAC. Both outputs may be used simultaneously. Rev. D | Page 14 of 21 Data Sheet DAC08 If one of the outputs is not required, it must be connected to ground or to a point capable of sourcing IFS; do not leave an unused output pin open. Both outputs have an extremely wide voltage compliance enabling fast direct current to voltage conversion through a resistor tied to ground or other voltage source. Positive compliance is 36 V above V− and is independent of the positive supply. Negative compliance is given by V− + (IREF × 1 kΩ) + 2.5 V The dual outputs enable double the usual peak-to-peak load swing when driving loads in quasi-differential fashion. This feature is especially useful in cable driving, CRT deflection and in other balanced applications such as driving center-tapped coils and transformers. POWER SUPPLIES The DAC08 operates over a wide range of power supply voltages from a total supply of 9 V to 36 V. When operating at supplies of ±5 V or lower, IREF ≤ 1 mA is recommended. Low reference current operation decreases power consumption and increases negative compliance (Figure 11), reference amplifier negative common-mode range (Figure 14), negative logic input range (Figure 15), and negative logic threshold range (Figure 16). For example, operation at −4.5 V with IREF = 2 mA is not recommended because negative output compliance reduces to near zero. Operation from lower supplies is possible; however, at least 8 V total must be applied to ensure turn on of the internal bias network. Symmetrical supplies are not required, as the DAC08 is quite insensitive to variations in supply voltage. Battery operation is feasible because no ground connection is required; however, an artificial ground can ensure logic swings, etc., remain between acceptable limits. Power consumption is calculated as follows: PD = ( I + ) (V + ) + ( I − ) (V − ) A useful feature of the DAC08 design is that supply current is constant and independent of input logic states. This is useful in cryptographic applications and further reduces the size of the power supply bypass capacitors. TEMPERATURE PERFORMANCE The nonlinearity and monotonicity specifications of the DAC08 are guaranteed to apply over the entire rated operating temperature range. Full-scale output current drift is low, typically ±10 ppm/°C, with zero-scale output current and drift essentially negligible compared to 1/2 LSB. The temperature coefficient of the reference resistor R14 must match and track that of the output resistor for minimum overall full-scale drift. Settling times of the DAC08 decrease approximately 10% at –55°C. At +125°C, an increase of about 15% is typical. The reference amplifier must be compensated by using a capacitor from Pin 16 to V−. For fixed reference operation, a 0.01 µF capacitor is recommended. For variable reference applications, refer to the Reference Amplifier Compensation for Multiplying Applications section. MULTIPLYING OPERATION The DAC08 provides excellent multiplying performance with an extremely linear relationship between IFS and IREF over a range of 4 µA to 4 mA. Monotonic operation is maintained over a typical range of IREF from 100 µA to 4.0 mA. SETTLING TIME The DAC08 is capable of extremely fast settling times, typically 85 ns at IREF = 2.0 mA. Judicious circuit design and careful board layout must obtain full performance potential during testing and application. The logic switch design enables propagation delays of only 35 ns for each of the 8 bits. Settling time to within 1/2 LSB of the LSB is therefore 35 ns, with each progressively larger bit taking successively longer. The MSB settles in 85 ns, thus determining the overall settling time of 85 ns. Settling to 6-bit accuracy requires about 65 ns to 70 ns. The output capacitance of the DAC08, including the package, is approximately 15 pF; therefore the output RC time constant dominates settling time if RL > 500 Ω. Settling time and propagation delay are relatively insensitive to logic input amplitude and rise and fall times, due to the high gain of the logic switches. Settling time also remains essentially constant for IREF values. The principal advantage of higher IREF values lies in the ability to attain a given output level with lower load resistors, thus reducing the output RC time constant. Measuring the settling time requires the ability to accurately resolve ±4 µA; therefore a 1 kΩ load is needed to provide adequate drive for most oscilloscopes. The settling time fixture shown in Figure 33 uses a cascade design to permit driving a 1 kΩ load with less than 5 pF of parasitic capacitance at the measurement node. At IREF values of less than 1.0 mA, excessive RC damping of the output is difficult to prevent while maintaining adequate sensitivity. However, the major carry from 01111111 to 10000000 provides an accurate indicator of settling time. This code change does not require the normal 6.2 time constants to settle to within ±0.2% of the final value, and thus settling time is observed at lower values of IREF. DAC08 switching transients or “glitches” are very low and can be further reduced by small capacitive loads at the output at a minor sacrifice in settling time. Fastest operation can be obtained by using short leads, minimizing output capacitance and load resistor values, and by adequate bypassing at the supply, reference, and VLC terminals. Supplies do not require large electrolytic bypass capacitors because the supply current drain is independent of input logic states; 0.1 µF capacitors at the supply pins provide full transient protection. Rev. D | Page 15 of 21 DAC08 Data Sheet VL FOR TURN-ON, VL = 2.7V FOR TURN-OFF, VL = 0.7V 1kΩ +5V 1µF 50µF MINIMUM CAPACITANCE VOUT 1× PROBE 1kΩ VCL 0.7V Q1 VIN 0.1µF RREF 1µF 14 5 6 7 8 9 10 11 12 100kΩ 4 15 15kΩ –0.4V 0.1µF IOUT DAC08 R15 2kΩ +0.4V 0V 0V 2 13 3 –15V 16 0.01µF 00268-C-034 +VREF Q2 0.1µF 0.1µF +15V –15V Figure 33. Settling Time Measurement Rev. D | Page 16 of 21 Data Sheet DAC08 ANALOG DEVICES, INC., CURRENT OUTPUT DACs Table 4 lists the latest DACs available from Analog Devices. Table 5. Model AD5425 AD5426 AD5450 AD5424 AD5429 AD5428 AD5432 AD5451 AD5433 AD5439 AD5440 AD5443 AD5452 AD5445 AD5444 AD5449 AD5415 AD5447 AD5405 AD5453 AD5553 AD5556 AD5446 AD5555 AD5557 AD5543 AD5546 AD5545 AD5547 Bits 8 8 8 8 8 8 10 10 10 10 10 12 12 12 12 12 12 12 12 14 14 14 14 14 14 16 16 16 16 Outputs 1 1 1 1 2 2 1 1 1 2 2 1 1 1 1 2 2 2 2 1 1 1 1 2 2 1 1 2 2 Interface SPI, 8-bit load SPI SPI Parallel SPI Parallel SPI SPI Parallel SPI Parallel SPI SPI Parallel SPI SPI SPI Parallel Parallel SPI SPI Parallel SPI SPI Parallel SPI Parallel SPI Parallel Package MSOP-10 MSOP-10 SOT23-8 TSSOP-16 TSSOP-16 TSSOP-20 MSOP-10 SOT23-8 TSSOP-20 TSSOP-16 TSSOP-24 MSOP-10 SOT23-8 TSSOP-20 MSOP-10 TSSOP-16 TSSOP-24 TSSOP-24 LFCSP-40 SOT23-8 MSOP-8 TSSOP-28 MSOP-10 TSSOP-16 TSSOP-38 MSOP-8 TSSOP-28 TSSOP-16 TSSOP-38 Comments Fast 8-bit load; see also AD5426 See also AD5425 fast load See also AD5425 fast load See also AD5452 and AD5444 Higher accuracy version of AD5443; see also AD5444 Higher accuracy version of AD5443; see also AD5452 Uncommitted resistors Uncommitted resistors MSOP version of AD5453; compatible with AD5443, AD5432, and AD5426 Rev. D | Page 17 of 21 DAC08 Data Sheet OUTLINE DIMENSIONS 0.775 0.755 0.735 PIN 1 INDICATOR 1 8 0.280 0.250 0.240 TOP VIEW 0.100 BSC 0.210 MAX SIDE VIEW 0.325 0.310 0.300 0.195 0.130 0.115 0.015 MIN 0.150 0.130 0.115 0.022 0.018 0.015 0.070 0.045 0.060 0.039 0.055 0.030 0.015 GAUGE PLANE END VIEW SEATING PLANE 0.021 0.016 0.011 0.012 0.010 0.008 0.430 MAX 03-07-2014-D 9 16 COMPLIANT TO JEDEC STANDARDS MS-001-BB Figure 34. 16-Lead Plastic Dual In-Line Package [PDIP] Narrow Body (N-16) Dimensions shown in inches 0.005 (0.13) MIN 0.098 (2.49) MAX 16 9 1 PIN 1 0.310 (7.87) 0.220 (5.59) 8 0.100 (2.54) BSC 0.320 (8.13) 0.290 (7.37) 0.840 (21.34) MAX 0.200 (5.08) MAX 0.200 (5.08) 0.125 (3.18) 0.023 (0.58) 0.014 (0.36) 0.060 (1.52) 0.015 (0.38) 0.150 (3.81) MIN SEATING 0.070 (1.78) PLANE 0.030 (0.76) 15° 0° 0.015 (0.38) 0.008 (0.20) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 35. 16-Lead Ceramic Dual In-Line Package [CERDIP] (Q-16) Dimensions shown in inches and (millimeters) Rev. D | Page 18 of 21 Data Sheet DAC08 10.00 (0.3937) 9.80 (0.3858) 4.00 (0.1575) 3.80 (0.1496) 9 16 1 8 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10 0.51 (0.0201) 0.31 (0.0122) 6.20 (0.2441) 5.80 (0.2283) 0.50 (0.0197) 0.25 (0.0098) 1.75 (0.0689) 1.35 (0.0531) SEATING PLANE 45° 8° 0° 1.27 (0.0500) 0.40 (0.0157) 0.25 (0.0098) 0.17 (0.0067) 060606-A COMPLIANT TO JEDEC STANDARDS MS-012-AC CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 36. 16-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-16) Dimensions shown in millimeters and (inches) 0.100 (2.54) 0.064 (1.63) 0.200 (5.08) REF 0.100 (2.54) REF 0.015 (0.38) MIN 0.075 (1.91) REF 0.095 (2.41) 0.075 (1.90) 19 18 0.358 (9.09) 0.342 (8.69) SQ 0.358 (9.09) MAX SQ 0.088 (2.24) 0.054 (1.37) 0.011 (0.28) 0.007 (0.18) R TYP 0.075 (1.91) REF 3 20 4 0.028 (0.71) 0.022 (0.56) 1 BOTTOM VIEW 0.055 (1.40) 0.045 (1.14) 0.050 (1.27) BSC 8 14 13 9 45° TYP 0.150 (3.81) BSC CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETERS DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN Figure 37. 20-Terminal Ceramic Leadless Chip Carrier [LCC] (E-20-1) Dimensions shown in inches and (millimeters) ORDERING GUIDE Model 1, 2, 3 DAC08AQ DAC08AQ/883C DAC08HQ DAC08Q DAC08RC/883C DAC08EQ DAC08ES DAC08ESZ DAC08ESZ-REEL DAC08CP DAC08CPZ DAC08CS DAC08CS-REEL DAC08CSZ DAC08CSZ-REEL DAC08EPZ 1 2 3 NL ±0.10% ±0.10% ±0.10% ±0.19% ±0.19% ±0.19% ±0.19% ±0.19% ±0.19% ±0.39% ±0.39% ±0.39% ±0.39% ±0.39% ±0.39% ±0.19% Temperature Range −55°C to +125°C −55°C to +125°C 0°C to 70°C −55°C to +125°C −55°C to +125°C 0°C to 70°C 0°C to 70°C 0°C to 70°C 0°C to 70°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C 0°C to 70°C Package Description 16-Lead CERDIP 16-Lead CERDIP 16-Lead CERDIP 16-Lead CERDIP 20-Terminal LCC 16-Lead CERDIP 16-Lead SOIC 16-Lead SOIC 16-Lead SOIC 16-Lead PDIP 16-Lead PDIP 16-Lead SOIC 16-Lead SOIC 16-Lead SOIC 16-Lead SOIC 16-Lead PDIP Devices processed in total compliance to MIL-STD-883. Consult the factory for the 883 data sheet. For availability and burn-in information on the SOIC package, contact your local sales office. Z = RoHS Compliant Part. Rev. D | Page 19 of 21 Package Option Q-16 Q-16 Q-16 Q-16 E-20-1 Q-16 R-16 R-16 R-16 N-16 N-16 R-16 R-16 R-16 R-16 N-16 No. Parts Per Container 25 25 25 25 55 25 47 47 2500 25 25 47 2500 47 2500 25 DAC08 Data Sheet NOTES Rev. D | Page 20 of 21 Data Sheet DAC08 NOTES ©2002–2016 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00268-0-3/16(D) Rev. D | Page 21 of 21