FEATURES FUNCTIONAL BLOCK DIAGRAM Enhanced product features Supports defense and aerospace applications (AQEC) Military temperature range (−55°C to +125°C) Controlled manufacturing baseline One assembly/test site One fabrication site Enhanced product change notification Qualification data available on request Low power, smallest pin-compatible octal DAC: 16 bits 16-lead TSSOP On-chip 1.25 V, 5 ppm/°C reference Power down to 400 nA at 5 V, 200 nA at 3 V 2.7 V to 5.5 V power supply Guaranteed monotonic by design Power-on reset to zero scale or midscale 3 power-down functions Hardware LDAC and LDAC override function CLR function to programmable code Rail-to-rail operation VREFIN/VREFOUT VDD AD5668-EP LDAC 1.25V/2.5V REF INPUT REGISTER INPUT REGISTER INPUT REGISTER SCLK INTERFACE LOGIC SYNC INPUT REGISTER INPUT REGISTER DIN INPUT REGISTER DAC REGISTER DAC REGISTER DAC REGISTER DAC REGISTER DAC REGISTER DAC REGISTER STRING DAC B STRING DAC C STRING DAC D STRING DAC E STRING DAC F INPUT REGISTER DAC REGISTER STRING DAC G INPUT REGISTER DAC REGISTER STRING DAC H BUFFER VOUTA BUFFER VOUTB BUFFER VOUTC BUFFER VOUTD BUFFER VOUTE BUFFER VOUTF BUFFER VOUTG BUFFER VOUTH POWER-DOWN LOGIC POWER-ON RESET GND LDAC1 CLR1 1RU-16 STRING DAC A PACKAGE ONLY 09463-001 Data Sheet Octal, 16-Bit DAC with 5 ppm/°C On-Chip Reference in 14-Lead TSSOP AD5668-EP Figure 1. APPLICATIONS Process control Data acquisition systems Portable battery-powered instruments GENERAL DESCRIPTION The AD5668-EP is a low power, octal, 16-bit, buffered voltageoutput digital-to-analog converter (DAC). It operates from a single 2.7 V to 5.5 V supply and is guaranteed monotonic by design. The AD5668-EP has an on-chip reference with an internal gain of 2. The AD5668-EP has a 1.25 V, 5 ppm/°C reference, giving a full-scale output range of 2.5 V. The on-board reference is off at power-up, allowing the use of an external reference, and the internal reference is enabled via a software write. DAC channels to simultaneously update. There is also an asynchronous CLR that updates all DACs to a userprogrammable code—zero scale, midscale, or full scale. The AD5668-EP uses a versatile 3-wire serial interface that operates at clock rates up to 50 MHz and is compatible with standard SPI, QSPI, MICROWIRE, and DSP interface standards. Additional application and technical information can be found in the AD5668 data sheet. PRODUCT HIGHLIGHTS The part incorporates a power-on-reset circuit that ensures that the DAC output powers up to 0 V and remains powered up at this level until a valid write takes place. The part contains a powerdown feature that reduces the current consumption of the device to 400 nA at 5 V and provides software-selectable output loads while in power-down mode for any or all DAC channels. The outputs of all DACs can be updated simultaneously using the LDAC function, with the added functionality of user-selectable Rev. A 1. 2. 3. 4. 5. Octal, 16-bit DAC. On-chip 1.25 V/2.5 V, 5 ppm/°C reference. Available in 16-lead TSSOP. Power-on reset to 0 V or midscale. Power-down capability. When powered down, the DAC typically consumes 200 nA at 3 V and 400 nA at 5 V. 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 ©2010–2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com AD5668-EP Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Timing Characteristics .................................................................5 Applications ....................................................................................... 1 Absolute Maximum Ratings ............................................................6 Functional Block Diagram .............................................................. 1 ESD Caution...................................................................................6 General Description ......................................................................... 1 Pin Configurations and Function Descriptions ............................7 Product Highlights ........................................................................... 1 Typical Performance Characteristics ..............................................8 Revision History ............................................................................... 2 Outline Dimensions ....................................................................... 14 Specifications..................................................................................... 3 Ordering Guide .......................................................................... 14 AC Characteristics........................................................................ 4 REVISION HISTORY 1/15—Rev. 0 to Rev. A Changes to Ordering Guide .......................................................... 14 10/10—Revision 0: Initial Version Rev. A | Page 2 of 14 Data Sheet AD5668-EP SPECIFICATIONS VDD = 4.5 V to 5.5 V, RL = 2 kΩ to GND, CL = 200 pF to GND, VREFIN = VDD. All specifications TMIN to TMAX, unless otherwise noted. Temperature range is −55°C to +125°C, typical at +25°C. Table 1. Parameter STATIC PERFORMANCE1 Resolution Relative Accuracy Differential Nonlinearity Zero-Code Error Zero-Code Error Drift Full-Scale Error Gain Error Gain Temperature Coefficient Offset Error DC Power Supply Rejection Ratio DC Crosstalk (External Reference) Min DC Output Impedance Short-Circuit Current Power-Up Time REFERENCE INPUTS Reference Current Reference Input Range Reference Input Impedance REFERENCE OUTPUT Output Voltage Reference Temperature Coefficient2 Reference Output Impedance LOGIC INPUTS2 Input Current Input Low Voltage, VINL Input High Voltage, VINH Pin Capacitance POWER REQUIREMENTS VDD IDD (Normal Mode)3 VDD = 4.5 V to 5.5 V VDD = 4.5 V to 5.5 V IDD (All Power-Down Modes)4 VDD = 4.5 V to 5.5 V Max ±8 ±21 ±1 14 16 1 ±2 −0.2 ±2.5 ±1 –80 10 5 10 25 10 DC Crosstalk (Internal Reference) OUTPUT CHARACTERISTICS2 Output Voltage Range Capacitive Load Stability Typ 0 −1 ±1 ±14 VDD Bits LSB LSB mV µV/°C % FSR % FSR ppm mV dB µV µV/mA µV µV µV/mA V nF nF Ω mA µs 2 10 0.5 30 4 40 Unit Conditions/Comments See Figure 4 Guaranteed monotonic by design (see Figure 7) All 0s loaded to DAC register (see Figure 9) All 1s loaded to DAC register (see Figure 10) Of FSR/°C VDD ± 10% Due to full-scale output change, RL = 2 kΩ to GND or VDD Due to load current change Due to powering down (per channel) Due to full-scale output change, RL = 2 kΩ to GND or VDD Due to load current change RL = ∞ RL = 2 kΩ VDD = 5 V Coming out of power-down mode, VDD = 5 V 55 VDD µA V kΩ VREF = VDD = 5.5 V (per DAC channel) 1.253 V ppm/°C kΩ At ambient ±3 0.8 µA V V pF All digital inputs VDD = 5 V VDD = 5 V 5.5 V 1.3 2 1.8 2.6 mA mA All digital inputs at 0 or VDD, DAC active, excludes load current VIH = VDD and VIL = GND Internal reference off Internal reference on 0.4 1 µA VIH = VDD and VIL = GND 0 14.6 1.247 ±5 7.5 2 3 4.5 Linearity calculated using a reduced code range of AD5668 (Code 512 to 65,024). Output unloaded. Guaranteed by design and characterization; not production tested. 3 Interface inactive. All DACs active. DAC outputs unloaded. 4 All eight DACs powered down. 1 2 Rev. A | Page 3 of 14 AD5668-EP Data Sheet AC CHARACTERISTICS VDD = 2.7 V to 5.5 V, RL = 2 kΩ to GND, CL = 200 pF to GND, VREFIN = VDD. All specifications TMIN to TMAX, unless otherwise noted. Temperature range is −55°C to +125°C, typical at +25°C. Table 2. Parameter1 Output Voltage Settling Time Slew Rate Digital-to-Analog Glitch Impulse Digital Feedthrough Reference Feedthrough Digital Crosstalk Analog Crosstalk DAC-to-DAC Crosstalk Multiplying Bandwidth Total Harmonic Distortion Output Noise Spectral Density Output Noise 1 Min Typ 6 1.5 4 0.1 −90 0.5 2.5 3 340 −80 120 100 15 Max 10 Unit µs V/µs nV-sec nV-sec dB nV-sec nV-sec nV-sec kHz dB nV/√Hz nV/√Hz μV p-p Conditions/Comments ¼ to ¾ scale settling to ±2 LSB 1 LSB change around major carry (see Figure 24) VREF = 2 V ± 0.1 V p-p, frequency = 10 Hz to 20 MHz VREF = 2 V ± 0.2 V p-p VREF = 2 V ± 0.1 V p-p, frequency = 10 kHz DAC code = 0x8400, 1 kHz DAC code = 0x8400, 10 kHz 0.1 Hz to 10 Hz Guaranteed by design and characterization; not production tested. Rev. A | Page 4 of 14 Data Sheet AD5668-EP TIMING CHARACTERISTICS All input signals are specified with tr = tf = 1 ns/V (10% to 90% of VDD) and timed from a voltage level of (VIL + VIH)/2. See Figure 2. VDD = 2.7 V to 5.5 V. All specifications TMIN to TMAX, unless otherwise noted. Table 3. Limit at TMIN, TMAX VDD = 2.7 V to 5.5 V 20 8 8 13 4 4 0 15 13 0 10 15 5 0 300 Parameter t11 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12 t13 t14 t15 Conditions/Comments SCLK cycle time SCLK high time SCLK low time SYNC to SCLK falling edge set-up time Data setup time Data hold time SCLK falling edge to SYNC rising edge Minimum SYNC high time SYNC rising edge to SCLK fall ignore SCLK falling edge to SYNC fall ignore LDAC pulse width low SCLK falling edge to LDAC rising edge CLR pulse width low SCLK falling edge to LDAC falling edge CLR pulse activation time Maximum SCLK frequency is 50 MHz at VDD = 2.7 V to 5.5 V. Guaranteed by design and characterization; not production tested. t10 t1 t9 SCLK t8 t3 t4 t2 t7 SYNC t6 t5 DIN DB31 DB0 t14 t11 LDAC1 t12 LDAC2 CLR VOUT t13 t15 09463-002 1 Unit ns min ns min ns min ns min ns min ns min ns min ns min ns min ns min ns min ns min ns min ns min ns typ 1ASYNCHRONOUS LDAC UPDATE MODE. 2SYNCHRONOUS LDAC UPDATE MODE. Figure 2. Serial Write Operation Rev. A | Page 5 of 14 AD5668-EP Data Sheet ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Table 4. Parameter VDD to GND Digital Input Voltage to GND VOUT to GND VREFIN/VREFOUT to GND Operating Temperature Range Industrial Storage Temperature Range Junction Temperature (TJ MAX) TSSOP Package Power Dissipation θJA Thermal Impedance Reflow Soldering Peak Temperature SnPb Pb Free Rating −0.3 V to +7 V −0.3 V to VDD + 0.3 V −0.3 V to VDD + 0.3 V −0.3 V to VDD + 0.3 V −55°C to +125°C −65°C to +150°C 150°C 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. ESD CAUTION (TJ MAX − TA)/θJA 150.4°C/W 240°C 260°C Rev. A | Page 6 of 14 Data Sheet AD5668-EP LDAC 1 16 SCLK SYNC 2 15 DIN VDD 3 14 GND VOUTB VOUTA 4 AD5668-EP 13 VOUTC 5 TOP VIEW (Not to Scale) 12 VOUTD VOUTE 6 11 VOUTF VOUTG 7 10 VOUTH VREFIN/VREFOUT 8 9 CLR Figure 3. Pin Configuration Table 5. Pin Function Descriptions Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Mnemonic LDAC SYNC VDD VOUTA VOUTC VOUTE VOUTG VREFIN/VREFOUT CLR VOUTH VOUTF VOUTD VOUTB GND DIN SCLK Rev. A | Page 7 of 14 09463-003 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS AD5668-EP Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 1.0 10 VDD = VREF = 5V TA = 25°C 0.6 0.4 DNL ERROR (LSB) 6 4 2 0 –2 0.2 0 –0.2 –4 –0.4 –6 –0.6 –8 –0.8 65000 CODE Figure 4. INL—External Reference Figure 7. DNL 10 1.0 VDD = 3V VREFOUT = 1.25V TA = 25°C 8 6 0.8 0.6 4 0.4 0 –2 0.2 –0.2 –0.4 –6 –0.6 –8 –0.8 –1.0 –55 65000 –35 –15 09463-005 60000 55000 50000 45000 40000 35000 30000 25000 20000 15000 10000 0 5000 CODE GAIN ERROR 0 –4 –10 FULL-SCALE ERROR 5 25 45 65 TEMPERATURE (°C) 85 105 125 09463-008 2 125 09463-009 ERROR (% FSR) INL ERROR (LSB) 09463-007 60000 55000 50000 45000 40000 35000 30000 25000 20000 15000 –1.0 5000 5k 10k 15k 20k 25k 30k 35k 40k 45k 50k 55k 60k 65k CODE 10000 0 0 –10 VDD = 3V VREFOUT = 1.25V TA = 25°C 0.8 09463-004 INL ERROR (LSB) 8 Figure 8. Gain Error and Full-Scale Error vs. Temperature Figure 5. INL 1.5 1.0 VDD = VREF = 5V TA = 25°C 0.8 1.0 0.6 ERROR (mV) ZERO-SCALE ERROR 0.2 0 –0.2 0 –0.5 –1.0 OFFSET ERROR –0.4 –1.5 –0.6 –2.0 –0.8 –1.0 0 10k 20k 30k CODE 40k 50k 60k 09463-006 DNL ERROR (LSB) 0.5 0.4 –2.5 –55 Figure 6. DNL—External Reference –35 –15 5 25 45 65 TEMPERATURE (°C) 85 105 Figure 9. Zero-Scale Error and Offset Error vs. Temperature Rev. A | Page 8 of 14 Data Sheet AD5668-EP 1.0 14 VDD = 3.6V VDD = 5.5V 12 0.5 10 FREQUENCY ERROR (% FSR) GAIN ERROR 0 FULL-SCALE ERROR –0.5 VREFOUT = 2.5V VREFOUT = 1.25V 8 6 –1.0 4 –1.5 3.2 3.7 4.2 VDD (V) 4.7 5.2 0 09463-010 –2.0 2.7 2.02 2.04 2.06 2.08 2.10 2.12 2.14 2.16 2.18 2.20 2.22 2.24 2.26 2.28 IDD (mA) Figure 13. IDD Histogram with Internal Reference Figure 10. Gain Error and Full-Scale Error vs. Supply Voltage 0.5 1.0 DAC LOADED WITH FULL-SCALE SOURCING CURRENT TA = 25°C 0.4 ZERO-SCALE ERROR 0.3 ERROR VOLTAGE (V) –0.5 –1.0 –1.5 0.2 VDD = 3V VREFOUT = 1.25V 0.1 0 –0.1 –0.2 VDD = 5V VREFOUT = 2.5V –0.3 3.2 3.7 4.2 VDD (V) 4.7 5.2 –0.4 –0.5 –10 09463-011 –2.5 2.7 OFFSET ERROR –6 –4 –2 0 2 CURRENT (mA) 4 6 8 10 Figure 14. Headroom at Rails vs. Source and Sink Figure 11. Zero-Scale Error and Offset Error vs. Supply Voltage 6 20 VDD = 3.6V VDD = 5.5V 5 16 VDD = 5V VREFOUT = 2.5V TA = 25°C FULL SCALE 3/4 SCALE 4 14 VOUT (V) 12 10 8 3 MIDSCALE 2 1/4 SCALE 6 1 4 0 ZERO SCALE 2 0 1.20 1.22 1.24 1.26 1.28 1.30 1.32 1.34 1.36 1.38 1.40 1.42 1.44 IDD (mA) –1 –30 09463-012 FREQUENCY –8 –20 –10 0 10 CURRENT (mA) Figure 15. Source and Sink Capability Figure 12. IDD Histogram with External Reference Rev. A | Page 9 of 14 20 30 09463-015 ERROR (mV) 0 –2.0 DAC LOADED WITH ZERO-SCALE SINKING CURRENT 09463-014 0.5 18 09463-013 2 AD5668-EP 2.0 Data Sheet TA = 25°C 8 VDD = VREF = 5V 1.8 TA = 25°C 7 1.6 6 5 1.2 VDD = VREF = 3V IDD (mA) IDD (mA) 1.4 1.0 0.8 4 VDD = 5V 3 0.6 2 0.4 10512 20512 30512 40512 CODE 50512 60512 0 09463-017 0 512 1 2 3 VLOGIC (V) 4 5 6 Figure 19. Supply Current vs. Logic Input Voltage Figure 16. Supply Current vs. Code 1.6 VDD = 3V 0 VDD = VREFIN = 5.5V 1.4 1.2 IDD (mA) VDD = VREF = 5V TA = 25°C FULL-SCALE CODE CHANGE 0x0000 TO 0xFFFF OUTPUT LOADED WITH 2kΩ AND 200pF TO GND VDD = VREFIN = 3.6V 1.0 0.8 0.6 VOUT = 909mV/DIV 0.4 1 –20 0 20 40 60 TEMPERATURE (°C) 80 100 TIME BASE = 4µs/DIV Figure 20. Full-Scale Settling Time, 5 V Figure 17. Supply Current vs. Temperature 1.6 09463-021 0 –40 09463-018 0.2 TA = 25°C VDD = VREF = 5V TA = 25°C 1.4 1.2 0.8 VDD 1 0.6 0.4 MAX(C2)* 420.0mV 2 0.2 VOUT 3.2 3.7 4.2 VDD (V) 4.7 5.2 CH1 2.0V CH2 500mV M100µs 125MS/s A CH1 1.28V Figure 21. Power-On Reset to 0 V Figure 18. Supply Current vs. Supply Voltage Rev. A | Page 10 of 14 8.0ns/pt 09463-022 0 2.7 09463-019 IDD (mA) 1.0 09463-020 1 0.2 Data Sheet AD5668-EP 2.5000 VDD = VREF = 5V TA = 25°C 2.4995 2.4990 2.4985 VOUT (V) VDD 1 2.4980 2.4975 2.4970 2.4965 2.4960 M100µs 125MS/s A CH1 1.28V 8.0ns/pt 2.4950 0 64 Figure 22. Power-On Reset to Midscale 128 192 256 320 SAMPLE 384 448 512 09463-026 CH2 1.0V 09463-023 CH1 2.0V VDD = 5V VREFOUT = 2.5V TA = 25°C 4ns/SAMPLE NUMBER 2.4955 VOUT 512 09463-027 2 Figure 25. Analog Crosstalk 2.4900 SYNC 2.4895 1 SLCK 2.4890 3 VOUT (V) 2.4885 2.4880 2.4875 2.4870 VDD = 5V 2.4865 2 CH2 500mV M400ns A CH1 1.4V 09463-024 CH1 5.0V CH3 5.0V 2.4855 0 Figure 23. Exiting Power-Down to Midscale 0 64 128 192 256 320 SAMPLE 384 128 192 256 320 SAMPLE 384 448 VDD = VREF = 5V TA = 25°C DAC LOADED WITH MIDSCALE VDD = 5V VREFOUT = 2.5V TA = 25°C 4ns/SAMPLE NUMBER GLITCH IMPULSE = 3.55nV-s 1 LSB CHANGE AROUND MIDSCALE (0x8000 TO 0x7FFF) 2µV/DIV 2.505 2.504 2.503 2.502 2.501 2.500 2.499 2.498 2.497 2.496 2.495 2.494 2.493 2.492 2.491 2.490 2.489 2.488 2.487 2.486 2.485 64 Figure 26. DAC-to-DAC Crosstalk 448 512 09463-025 VOUT (V) VDD = 5V VREFOUT = 2.5V TA = 25°C 4ns/SAMPLE NUMBER 2.4860 1 4s/DIV Figure 27. 0.1 Hz to 10 Hz Output Noise Plot, External Reference Figure 24. Digital-to-Analog Glitch Impulse (Negative) Rev. A | Page 11 of 14 09463-028 VOUT AD5668-EP Data Sheet –20 VDD = 5V VREFOUT = 2.5V TA = 25°C DAC LOADED WITH MIDSCALE –30 –50 (dB) 10µV/DIV –40 VDD = 5V TA = 25°C DAC LOADED WITH FULL SCALE VREF = 2V ± 0.3V p-p 1 –60 –70 –80 5s/DIV 09463-032 09463-029 –90 –100 2k Figure 28. 0.1 Hz to 10 Hz Output Noise Plot, Internal Reference 4k 6k FREQUENCY (Hz) 8k 10k Figure 31. Total Harmonic Distortion 16 VDD = 3V VREFOUT = 1.25V TA = 25°C DAC LOADED WITH MIDSCALE VREF = VDD TA = 25°C 14 VDD = 3V TIME (µs) 5µV/DIV 12 1 10 VDD = 5V 8 4s/DIV 4 0 Figure 29. 0.1 Hz to 10 Hz Output Noise Plot, Internal Reference 1 2 3 4 5 6 7 CAPACITANCE (nF) 8 9 10 09463-033 09463-030 6 Figure 32. Settling Time vs. Capacitive Load 800 TA = 25°C MIDSCALE LOADED 700 CLR 600 VOUTF 500 400 300 VDD = 5V VREFOUT = 2.5V VOUTB 4 VDD = 3V VREFOUT = 1.25V 100 0 100 1k 2 10k FREQUENCY (Hz) 100k 1M Figure 30. Noise Spectral Density, Internal Reference CH3 5.0V CH2 1.0V CH4 1.0V M200ns A CH3 Figure 33. Hardware CLR Rev. A | Page 12 of 14 1.10V 09463-034 200 09463-031 OUTPUT NOISE (nV/ Hz) 3 Data Sheet AD5668-EP 5 VDD = 5V TA = 25°C 0 –5 –15 –20 –25 –30 –35 –40 10k 100k 1M FREQUENCY (Hz) 10M 09463-035 (dB) –10 Figure 34. Multiplying Bandwidth Rev. A | Page 13 of 14 AD5668-EP Data Sheet OUTLINE DIMENSIONS 5.10 5.00 4.90 16 9 4.50 4.40 4.30 6.40 BSC 1 8 PIN 1 1.20 MAX 0.15 0.05 0.20 0.09 0.30 0.19 0.65 BSC COPLANARITY 0.10 SEATING PLANE 0.75 0.60 0.45 8° 0° COMPLIANT TO JEDEC STANDARDS MO-153-AB Figure 35. 16-Lead Thin Shrink Small Outline Package [TSSOP] (RU-16) Dimensions shown in millimeters ORDERING GUIDE Model AD5668SRU-EP-1 AD5668SRU-EP-1RL7 Temperature Range −55°C to +125°C −55°C to +125°C Package Description 16-Lead TSSOP 16-Lead TSSOP ©2010–2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09463-0-1/15(A) Rev. A | Page 14 of 14 Package Option RU-16 RU-16 Power-On Reset to Code Zero Zero Accuracy ±21 LSB INL ±21 LSB INL Internal Reference 1.25 V 1.25 V