Fully Accurate 14-/16-Bit VOUT nanoDAC™ SPI Interface 2.7 V to 5.5 V, in an SOT-23 AD5040/AD5060 FEATURES FUNCTIONAL BLOCK DIAGRAM Single 14-/16-bit DAC, 1 LSB INL Power-on reset to midscale or zero scale Guaranteed monotonic by design 3 power-down functions Low power serial interface with Schmitt-triggered inputs Small 8-lead SOT-23 package, low power Fast settling time of 4 μs typically 2.7 V to 5.5 V power supply Low glitch on power-up SYNC interrupt facility VREF POWER-ON RESET VDD AD5040/ AD5060 BUF OUTPUT BUFFER DAC REGISTER REF(+) VOUT DAC AGND INPUT CONTROL LOGIC RESISTOR NETWORK 04767-001 POWER-DOWN CONTROL LOGIC APPLICATIONS Process control Data acquisition systems Portable battery-powered instruments Digital gain and offset adjustment Programmable voltage and current sources Programmable attenuators SYNC SCLK DIN DACGND Figure 1. GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD5040 and the AD5060, members of the ADI nanoDAC family, are low power, single 14-/16-bit buffered voltage-out DACs that operate from a single 2.7 V to 5.5 V supply. The AD5040/AD5060 parts offer a relative accuracy specification of ±1 LSB and operation are guaranteed monotonic with a ±1 LSB DNL specification. The parts use a versatile 3-wire serial interface that operates at clock rates up to 30 MHz and is compatible with standard SPI®, QSPI™, MICROWIRE™, and DSP interface standards. The reference for both the AD5040 and AD5060 is supplied from an external VREF pin. A reference buffer is also provided on-chip. The AD5060 incorporates a power-on reset circuit that ensures the DAC output powers up to midscale or zero scale and remains there until a valid write takes place to the device. The AD5040 and the AD5060 both contain a power-down feature that reduces the current consumption of the device to typically 330 nA at 5 V and provides software-selectable output loads while in power-down mode. The parts are put into power-down mode over the serial interface. Total unadjusted error for the parts is <2 mV. Both parts exhibit very low glitch on power-up. 1. Available in a small, 8-lead SOT-23 package. 2. 14-/16-bit accurate, 1 LSB INL. 3. Low glitch on power-up. 4. High speed serial interface with clock speeds up to 30 MHz. 5. Three power-down modes available to the user. 6. Reset to known output voltage (midscale, zero scale). Table 1. Related Devices Part No. AD5061 AD5062 AD5063 Description 2.7 V to 5.5 V, 16-bit nanoDAC D/A, 4 LSB INL, SOT-23 2.7 V to 5.5 V, 16-bit nanoDAC D/A,1 LSB INL, SOT-23 2.7 V to 5.5 V, 16-bit nanoDAC D/A, 1 LSB INL, MSOP Rev. A 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 www.analog.com Fax: 781.461.3113 © 2005-2010 Analog Devices, Inc. All rights reserved. AD5040/AD5060 TABLE OF CONTENTS Features .............................................................................................. 1 Reference Buffer ......................................................................... 15 Applications ....................................................................................... 1 Serial Interface ............................................................................ 15 General Description ......................................................................... 1 Power-On reset ........................................................................... 16 Functional Block Diagram .............................................................. 1 Software Reset ............................................................................. 16 Product Highlights ........................................................................... 1 Power-Down Modes .................................................................. 17 Revision History ............................................................................... 2 Microprocessor Interfacing ....................................................... 17 Specifications..................................................................................... 3 Applications..................................................................................... 19 Timing Characteristics..................................................................... 5 Choosing a Reference for the AD5040/ AD5060 ................... 19 Absolute Maximum Ratings............................................................ 6 Bipolar Operation Using the AD5040/ AD5060 .................... 19 ESD Caution .................................................................................. 6 Using the AD5040/AD5060 with a Galvanically Isolated Interface Chip ............................................................................. 20 Pin Configuration and Function Descriptions ............................. 7 Typical Performance Characteristics ............................................. 8 Terminology .................................................................................... 14 Theory of Operation ...................................................................... 15 Power Supply Bypassing and Grounding ................................ 20 Outline Dimensions ....................................................................... 21 Ordering Guide .......................................................................... 21 DAC Architecture ....................................................................... 15 REVISION HISTORY 1/10—Rev. 0 to Rev. A Changes to Table 2, Relative Accuracy (INL) and Endnote 1 .... 3 Updated Outline Dimensions ....................................................... 21 Changes to Ordering Guide .......................................................... 21 10/05—Revision 0: Initial Version Rev. A | Page 2 of 24 AD5040/AD5060 SPECIFICATIONS VDD = 5.5 V, VREF = 4.096 V @ RL = unloaded, CL = unloaded; TMIN to TMAX, unless otherwise noted. Table 2. Parameter STATIC PERFORMANCE Resolution A, B, and Y Grades1 Min Typ Max 16 14 Relative Accuracy (INL)2 Total Unadjusted Error (TUE)2 Differential Nonlinearity (DNL)2 Gain Error Gain Error Temperature Coefficient Offset Error Offset Error Temperature Coefficient Full-Scale Error OUTPUT CHARACTERISTICS3 Output Voltage Range Output Voltage Settling Time ±0.5 ±0.5 ±0.5 ±0.1 ±0.1 ±0.5 ±2 ±1 ±1.5 ±2.0 ±2.0 ±1 ±0.5 ±1 ±0.01 ±0.01 1 ±0.02 ±0.02 0.5 ±0.05 ±0.02 ±0.03 ±0.05 ±2.0 ±2.0 VREF Test Conditions/Comments Bits Bits LSB LSB AD5060 AD5040 −40°C to +85°C, AD5040/AD5060 A grade −40°C to +85°C, AD5040/AD5060 B grade −40°C to +125°C, AD5060 Y grade −40°C to +85°C, AD5040/AD5060 −40°C to +125°C, AD5060 Y grade Guaranteed monotonic, −40°C to +85°C, AD5040/AD5060 Guaranteed monotonic, −40°C to +125°C, Y grade TA = −40°C to +85°C, AD5040/AD5060 TA = −40°C to +125°C AD5060 Y grade mV LSB % of FSR ppm of FSR/°C mV μV/°C mV TA = −40°C to + 85°C, AD5040/AD5060 TA = −40°C to + 125°C, AD5060 Y grade All 1s loaded to DAC register, AD5040 AD5060; TA = −40°C to +85°C All 1s loaded to DAC register, TA = −40°C to +125°C, AD5060 Y grade 4 V μs Output Noise Spectral Density Output Voltage Noise 64 6 nV/√Hz μV p-p Digital-to-Analog Glitch Impulse 2 nV-s Digital Feedthrough DC Output Impedance (Normal) DC Output Impedance (Power-Down) (Output Connected to 1 kΩ Network)4 (Output Connected to 100 kΩ Network) Capacitive Load Stability Slew Rate 0. 003 0. 015 nV-s Ω DAC code = midscale , 0.1 Hz to 10 Hz bandwidth 1 LSB change around code 57386, RL = 5 kΩ, CL = 200 pF DAC code = full scale Output impedance tolerance ±10% 1 100 kΩ kΩ Output impedance tolerance ±400 Ω Output impedance tolerance ±20 kΩ 1. 2 nF V/μs 60 ma Loads used RL = 5 kΩ, RL = 100 kΩ, RL = ∞ ¼ scale to ¾ scale code transition to ±1 LSB, RL = 5 kΩ, CL = 200 pF DAC code = full scale, output shorted to GND, TA = 25°C DAC code = zero scale, output shorted to VDD, TA = 25°C Time to exit power-down mode to normal mode of AD5060, 24th clock edge to 90% of DAC final value, output unloaded VDD ± 10%, DAC code = full scale Short-Circuit Current 0 ±1.5 ±2.0 Unit 1 45 DAC Power-Up Time 4.5 μs DC Power Supply Rejection Ratio −92.11 db Rev. A | Page 3 of 24 ¼ scale to ¾ scale code transition to ±1 LSB, RL = 5 kΩ DAC code = midscale, 1 kHz AD5040/AD5060 Parameter Wideband Spurious-Free Dynamic Range (SFDR) REFERENCE INPUT/OUTPUT VREF Input Range5 Input Current (Power-Down) Input Current (Normal) DC Input Impedance LOGIC INPUTS Input Current6 VIL, Input Low Voltage VIH, Input High Voltage Pin Capacitance POWER REQUIREMENTS VDD IDD (Normal Mode) VDD = 2.7 V to 5.5 V IDD (All Power-Down Modes) VDD = 2.5 V to 5.5 V A, B, and Y Grades1 Min Typ Max −67 2 VDD − 50 ±0.1 ±0.5 1 ±1 ±2 0.8 0.8 2.0 1.8 Unit db mV μA μA MΩ μA V V 4 2.7 Test Conditions/Comments Output frequency = 10 kHz Zero scale loaded VDD = 4.5 V to 5.5 V VDD = 2.7 V to 3.6 V VDD = 2.7 V to 5.5 V VDD = 2.7 V to 3.6 V pF 5.5 V 1.0 1.2 mA 0. 82 1. 0 0.33 1 0.065 μA All digital inputs at 0 V or VDD DAC active and excluding load current VIN = VDD and VIL = GND, VDD = 5.0 V, VREF = 4.096 V, code = midscale VIN = VDD and VIL = GND, VDD = 3.0 V, VREF = 2.7 V, code = midscale VIH = VDD and VIL = GND, VDD = 5.5 V, VREF = 4.096 V, code = midscale VIH = VDD and VIL = GND, VDD = 3.0 V, VREF = 4.096 V, code = midscale 1 Temperature range for the A and B grades is −40°C to + 85° C, typical at 25°C; temperature range for the Y grade is −40°C to +125°C. Linearity calculated using a reduced code range (160 to code 65535 for AD5060 ) and (40 to code 16383 for AD5040). 3 Guaranteed by design and characterization, not production tested. 4 1 kΩ power-down network not available with the AD5040. 5 The typical output supply headroom performance for various reference voltages at −40°C can be seen in Figure 26. 6 Total current flowing into all pins. 2 Rev. A | Page 4 of 24 AD5040/AD5060 TIMING CHARACTERISTICS VDD = 2.7 V to 5.5 V; all specifications TMIN to TMAX, unless otherwise noted. Table 3. Limit 1 33 5 3 10 3 2 0 12 9 Parameter t1 2 t2 t3 t4 t5 t6 t7 t8 t9 2 Test Conditions/Comments SCLK cycle time SCLK high time SCLK low time SYNC to SCLK falling edge setup time Data setup time Data hold time SCLK falling edge to SYNC rising edge Minimum SYNC high time SYNC rising edge to next SCLK fall ignore 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. Maximum SCLK frequency is 30 MHz. t4 t2 t1 t9 SCLK t7 t3 t8 SYNC t6 t5 DIN D23 D22 D2 D1 Figure 2. AD5060 Timing Diagram Rev. A | Page 5 of 24 D0 D23 D22 04767-002 1 Unit ns min ns min ns min ns min ns min ns min ns min ns min ns min AD5040/AD5060 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter VDD to GND Digital Input Voltage to GND VOUT to GND VREF to GND Operating Temperature Range Industrial (A, B Grade) Extended Automotive Temperature Range (Y Grade) Storage Temperature Range Maximum Junction Temperature SOT-23 Package Power Dissipation θJA Thermal Impedance θJc Thermal Impedance Reflow Soldering (Pb-free) Peak Temperature Time-at-Peak Temperature ESD (AD5040/AD5060) Rating −0.3 V to +7.0 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 −40°C to +85°C −40°C to +125°C −65°C to +150°C 150°C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. This device is a high performance integrated circuit with an ESD rating of <2 kV. It is ESD sensitive. Proper precautions should be taken for handling and assembly. (TJ max − TA)/θJA 206°C/W 91°C/W 260°C 10 sec to 40 sec 1. 5 kV ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Rev. A | Page 6 of 24 AD5040/AD5060 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 8 SCLK VDD 2 AD5040/ AD5060 7 SYNC VREF 3 TOP VIEW (Not to Scale) 6 DACGND 5 AGND VOUT 4 04767-003 DIN 1 Figure 3. Pin Configuration Table 5. Pin Function Descriptions Pin No. 1 Mnemonic DIN 2 3 4 5 6 7 VDD VREF VOUT AGND DACGND SYNC 8 SCLK Description Serial Data Input. These parts have a 16-/24-bit shift register. Data is clocked into the register on the falling edge of the serial clock input. Power Supply Input. These parts can be operated from 2.7 V to 5.5 V and VDD should be decoupled to GND. Reference Voltage Input. Analog Output Voltage from DAC. Ground Reference Point for Analog Circuitry. Ground Input to the DAC Core. Level-Triggered Control Input (Active Low). This is the frame synchronization signal for the input data. When SYNC goes low, it enables the input shift register and data is transferred in on the falling edges of the following clocks. The DAC is updated following the 16th/24th clock cycle unless SYNC is taken high before this edge, in which case the rising edge of SYNC acts as an interrupt, and the write sequence is ignored by the DAC. Serial Clock Input. Data is clocked into the input shift register on the falling edge of the serial clock input. Data can be transferred at rates up to 30 MHz. Rev. A | Page 7 of 24 AD5040/AD5060 TYPICAL PERFORMANCE CHARACTERISTICS 0.6 VDD = 5.5V VREF = 4.096V TA = 25°C 1.4 1.2 1.0 0.8 0.6 VDD = 5.5V VREF = 4.096V TA = 25°C 0.5 0.4 INL ERROR (LSB) 0.3 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 –1.2 –1.4 0.2 0.1 0 –0.1 –0.2 –0.3 –1.6 160 10160 20160 30160 40160 DAC CODE 50160 –0.5 –0.6 160 60160 Figure 4. Typical AD5060 INL Plot 0.30 4360 6460 8560 10660 DAC CODE 12760 14860 VDD = 5.5V VREF = 4.096V TA = 25°C DNL ERROR (LSB) 0.25 0.20 0.15 0.10 0.05 0 –0.05 –0.10 –0.15 –0.20 –0.25 –0.30 10160 20160 30160 40160 DAC CODE 50160 04767-060 –1.2 –1.4 –1.6 160 04767-039 DNL ERROR (LSB) 0.40 0.35 VDD = 5.5V VREF = 4.096V TA = 25°C 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 –0.35 –0.40 160 60160 2260 4360 6460 8560 10660 DAC CODE 12760 14860 Figure 8. Typical AD5040 DNL Plot Figure 5. Typical AD5060 DNL Plot 0.020 0.10 0.08 2260 Figure 7. Typical AD5040 INL Plot 1.6 1.4 1.2 1.0 0.8 0.6 0.4 04767-061 –0.4 04767-040 INL ERROR (LSB) 1.6 VDD = 5.5V VREF = 4.096V TA = 25°C 0.015 VDD = 5.5V VREF = 4.096V TA = 25°C 0.06 0.010 TUE ERROR (mV) 0.02 0 –0.02 0.005 0 –0.005 –0.04 –0.010 –0.06 10160 20160 30160 40160 DAC CODE 50160 –0.020 160 60160 04767-062 –0.08 –0.10 160 –0.015 04767-041 TUE ERROR (mV) 0.04 2260 4360 6460 8560 10660 12760 14860 16960 DAC CODE Figure 9. Typical AD5040 TUE Plot Figure 6. Typical AD5060 TUE Plot Rev. A | Page 8 of 24 AD5040/AD5060 1.6 TA = 25°C 0.8 0.6 OFFSET ERROR (mV) MAX INL ERROR @ VDD = 5.5V 0.4 0.2 0 –0.2 –0.4 –0.6 MIN INL ERROR @ VDD = 5.5V –0.8 –1.4 –1.6 2.0 2.5 3.0 3.5 4.0 4.5 REFERENCE VOLTAGE (V) 5.0 04767-067 04767-009 –1.0 –1.2 5.5 Figure 10. INL vs. Reference Input Voltage1 1.6 1.4 1.2 Figure 13. Typical Offset Error vs. Temperature1 0.5 TA = 25°C 0.3 0.8 0.6 0.4 GAIN ERROR (% FSR) DNL ERROR (LSB) 1.0 MAX DNL ERROR @ VDD = 5.5V 0.2 0 –0.2 –0.4 –0.6 MIN DNL ERROR @ VDD = 5.5V –0.8 –1.0 MAX GAIN ERROR @ VDD = 2.7V MAX GAIN ERROR @ VDD = 5.5V 0.2 0.1 0 MIN GAIN ERROR @ VDD = 5.5V –0.1 –0.2 MIN GAIN ERROR @ VDD = 2.7V –0.3 04767-010 –1.2 –1.4 –1.6 2.0 VDD = 5.5V, VREF = 4.096V VDD = 2.7V, VREF = 2.0V 0.4 2.5 3.0 3.5 4.0 4.5 REFERENCE VOLTAGE (V) 5.0 –0.4 –0.5 –40 5.5 Figure 11. DNL vs. Reference Input Voltage1 20 40 60 80 TEMPERATURE (°C) 100 120 140 VDD = 5.5V, VREF = 4.096V 1.2 VDD = 2.7V, VREF = 2.0V 1.0 0.6 0.8 INL ERROR (LSB) 0.4 MAX TUE ERROR @ VDD = 5.5V 0.2 0 MIN TUE ERROR @ VDD = 5.5V –0.2 –0.4 0.4 0.2 0 –0.4 –0.6 2.5 3.0 3.5 4.0 4.5 REFERENCE VOLTAGE (V) 5.0 MIN INL ERROR @ VDD = 5.5V MAX INL ERROR @ VDD = 5.5V –0.2 –0.8 –1.0 MAX INL ERROR @ VDD = 2.7V 0.6 –0.6 04767-011 TUE ERROR (mV) 0 1.4 TA = 25°C 0.8 –1.2 2.0 –20 Figure 14. Typical Gain Error vs. Temperature1 1.2 1.0 04767-066 INL ERROR (LSB) 1.0 1.8 1.6 VDD = 5.5V, VREF = 4.096V 1.4 VDD = 2.7V, VREF = 2.0V 1.2 MAX OFFSET ERROR @ 1.0 VDD = 2.7V MAX OFFSET ERROR @ 0.8 VDD = 5.5V 0.6 0.4 0.2 MIN OFFSET ERROR @ 0 VDD = 5.5V –0.2 –0.4 –0.6 MIN OFFSET ERROR @ –0.8 VDD = 2.7V –1.0 –1.2 –1.4 –1.6 –1.8 –40 –20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) MIN INL ERROR @ VDD = 2.7V 04767-069 1.4 1.2 –0.8 –1.0 –40 5.5 Figure 12. TUE vs. Reference Input Voltage1 –20 0 20 40 60 80 TEMPERATURE (°C) 100 Figure 15. Typical INL Error vs. Temperature1 1 AD5060 only. Rev. A | Page 9 of 24 120 140 AD5040/AD5060 1.0 1.8 VDD = 5.5V, VREF = 4.096V 0.8 VDD = 2.7V, VREF = 2.0V 1.6 FULL-SCALE THREE QUARTER SCALE 1.4 MAX DNL ERROR @ VDD = 2.7V 0.4 1.2 0.2 IDD (mA) MAX DNL ERROR @ VDD = 5.5V 0 MIN DNL ERROR @ VDD = 5.5V –0.2 1.0 MID-SCALE QUARTER-SCALE 0.8 ZERO-SCALE 0.6 –0.4 MIN DNL ERROR @ VDD = 2.7V 0.4 –0.8 –1.0 –40 0.2 04767-071 –0.6 –20 0 20 40 60 80 TEMPERATURE (°C) 100 120 04767-044 DNL ERROR (LSB) 0.6 VDD = 5.5V VREF = 4.096V TA = 25°C 0 140 0 5M 10M 15M 20M 25M 30M FREQUENCY (Hz) 35M 40M 45M Figure 19. Typical Supply Current vs. Frequency @ 5.5 V1 Figure 16. Typical DNL Error vs. Temperature1 1.0 1.6 VDD = 5.5V, VREF = 4.096V 0.8 VDD = 2.7V, VREF = 2.0V VDD = 3V VREF = 2.5V TA = 25°C 1.4 0.6 MAX TUE ERROR @ VDD = 5.5V FULL-SCALE 1.0 MAX TUE ERROR @ VDD = 2.7V 0.2 0 MIN TUE ERROR @ VDD = 5.5V –0.2 THREE QUARTER SCALE 1.2 IDD (mA) TUE ERROR (mV) 0.4 0.8 MID-SCALE 0.6 ZERO-SCALE –0.4 0.4 MIN TUE ERROR @ VDD = 2.7V –20 0 20 40 60 80 TEMPERATURE (°C) 100 120 0 140 0 5M 10M 15M 20M 25M 30M FREQUENCY (Hz) 35M 40M 45M Figure 20. Typical Supply Current vs. Frequency @ 3 V1 Figure 17. Typical TUE Error vs. Temperature1 1.4 2.0 VDD = 5.5V, VREF = 4.096V VDD = 2.7V, VREF = 2.0V 1.2 04767-045 –0.8 –1.0 –40 0.2 04767-068 –0.6 VREF = 2.5V 1.8 TA = 25°C CODE = MIDSCALE 1.6 MAX IDD @ VDD = 5.5V 1.0 1.4 IDD (μA) 1.2 0.8 MAX IDD @ VDD = 2.7V 0.6 1.0 0.8 0.6 0.4 0 –40 –20 0 20 40 60 80 TEMPERATURE (°C) 100 120 04767-015 0.4 0.2 04767-072 IDD (mA) QUARTER-SCALE 0.2 0 2.5 140 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) 5.5 Figure 21. Typical Supply Current vs. Supply Voltage1 Figure 18. Typical Supply Current vs. Temperature1 1 AD5060 only. Rev. A | Page 10 of 24 6.0 AD5040/AD5060 3.00 TA = 25°C 2.75 VDD = 3V DAC = FULL SCALE VREF = 2.7V TA = 25°C 2.50 2.25 IDD (mA) 2.00 1.75 1.50 VDD = 5.5V, VREF = 4.096V 1.25 1.00 0.75 VDD = 3.0V, VREF = 2.5V 0.25 0 0 10000 20000 30000 40000 DAC CODE 50000 60000 04767-020 04767-014 0.50 Y AXIS = 2μV/DIV X AXIS = 4s/DIV 70000 Figure 22. Typical Supply Current vs. Digital Input Code1 Figure 25. 0.1 Hz to 10 Hz Noise Plot 0.50 24TH CLOCK FALLING 0.45 0.40 0.35 HEADROOM (V) CH1 = SCLK CH2 = VOUT 0.30 0.25 0.20 0.15 CH2 50mV/DIV CH1 2V/DIV 0.05 0 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 REFERENCE VOLTAGE (V) TIME BASE 400ns/DIV Figure 23. AD5060 Digital-to-Analog Glitch Impulse (See Figure 24) VDD = 5V VREF = 4.096V R = 5kΩ C = 220pF CODE = 57386 0.113 0.112 5.00 DAC OUTPUT VOLTAGE (V) 0.115 0.114 0.111 0.110 0.109 0.108 0.107 0.106 0.105 4.95 4.90 4.85 4.80 4.75 4.70 4.65 0.104 0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475 500 525 04767-043 0.103 4.60 4.55 4.70 4.72 4.74 4.76 4.78 4.80 4.82 4.84 4.86 4.88 4.90 4.92 4.94 4.96 4.98 5.00 VREF (V) SAMPLES Figure 24. AD5060 Digital-to-Analog Glitch Energy 1 VDD = 5.0V TA = 25°C DAC = FULL-SCALE 04767-042 AMPLITUDE Figure 26. VDD Headroom vs. Reference Voltage 5.05 0.117 0.116 0.102 0.101 04767-091 04767-017 0.10 Figure 27. Output Voltage vs. Reference Voltage AD5060 only. Rev. A | Page 11 of 24 AD5040/AD5060 5.005 C4 = 143mV p-p VREF = 5V TA = 25°C ZERO-SCALE DAC OUTPUT (V) 5.000 1kΩ TO GND 4.995 4.990 4.985 04767-065 4.975 04767-047 4.980 CH4 50.0mV 5.50 5.45 5.40 5.35 5.30 5.25 5.20 5.15 5.10 5.05 5.00 VDD (V) M4.00μs CH1 1.64V Figure 31. Glitch upon Entering Software Power-Down to Zero Scale Figure 28. Typical Output vs. Supply Voltage CH3 = SCLK 1kΩ TO GND ZERO-SCALE C4 = 50mV p-p CH2 = VOUT CH1 2V/DIV CH2 2V/DIV 04767-048 04767-019 CH1 = TRIGGER CH4 20.0mV CH3 2V TIME BASE = 5.00μs M1.00μs CH1 1.64V Figure 32. Glitch upon Exiting Software Power-Down to Zero Scale Figure 29. Time to Exit Power-Down to Midscale VDD = 5V VREF = 4.096V TA = 25°C 350 FULL-SCALE C2 25mV p-p 300 250 200 C3 4.96V p-p T 2 MID-SCALE C3 FALL 935.0μs 150 T 50 ZERO-SCALE 1k 10k FREQUENCY (Hz) 100k Figure 30. Noise Spectral Density 3 04767-049 0 –50 100 C3 RISE ∞s NO VALID EDGE QUARTER-SCALE 100 04767-046 NOISE SPECTRAL DENSITY (nV/ Hz) 400 CH3 2.00V 1M CH2 50mV M1.00ms CH3 1.36V Figure 33. Glitch upon Entering Hardware Power-Down to Three-State Rev. A | Page 12 of 24 AD5040/AD5060 2.1 2.0 C2 30mV p-p 1.9 VDD = 5.5V VREF = 4.096V 10% TO 90% RISE TIME = 0.688μs SLEW RATE = 1.16V/μs 2.04V 1.8 C3 4.96V p-p T 2 1.7 1.6 C3 FALL ∞s NO VALID EDGE 1.3 C3 RISE 946.2μs 1.2 1.04V 04767-050 3 CH3 2.00V CH2 50mV M1.00ms CH3 1.1 1.0 –10μs –8μs –6μs –4μs –2μs 1.36V Figure 34. Glitch upon Exiting Hardware Power-Down to Zero Scale 2μs 4μs 6μs 8μs 9.96μs 16 CODE = MID-SCALE VDD = 5V, VREF = 4.096V VDD = 3V, VREF = 2.5V 14 0.0006 12 0.0004 10 FREQUENCY 0.0002 0 8 6 –0.0002 VDD = 5.5V 4 –0.0004 VDD = 3V –0.0008 –25 –20 –15 –10 2 04767-051 –0.0006 –5 0 5 10 CURRENT (mA) 15 20 25 0 30 04767-075 Δ VOLTAGE (V) 0 Figure 37. Typical Output Slew Rate 0.0010 0.0008 DAC OUTPUT 1.4 04767-052 T 1.5 0.83 Figure 35. Typical Output Load Regulation 0.85 0.86 0.87 0.88 BIN 0.89 0.90 0.91 MORE Figure 38. IDD Histogram VDD = 3.0 V 0.10 0.08 0.84 14 CODE = MIDSCALE VDD = 5V, VREF = 4.096V VDD = 3V, VREF = 2.5V 12 0.06 VDD = 3V, VREF = 2.5V 10 FREQUENCY 0.02 0 –0.02 –0.04 8 6 4 –0.06 –0.08 –0.10 –25 –20 –15 –10 –5 0 5 IOUT (mA) 10 15 20 25 30 Figure 36. Typical Current Limiting Plot 2 0 04767-076 VDD = 5V, VREF = 4.096V 04767-063 Δ VOUT (V) 0.04 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11MORE BIN Figure 39. IDD Histogram VDD = 5.0 V Rev. A | Page 13 of 24 AD5040/AD5060 TERMINOLOGY Relative Accuracy For the DAC, relative accuracy or integral nonlinearity (INL) is a measure of the maximum deviation, in LSBs, from a straight line passing through the endpoints of the DAC transfer function. A typical AD5060 INL vs. code plot is shown in Figure 4. Differential Nonlinearity (DNL) Differential nonlinearity is the difference between the measured change and the ideal 1 LSB change between any two adjacent codes. A specified differential nonlinearity of ±1 LSB maximum ensures monotonicity. This DAC is guaranteed monotonic by design. A typical AD5060 DNL vs. code plot is shown in Figure 5. Offset Error Offset error is a measure of the output error when zero code (0x0000) is loaded to the DAC register. Ideally, the output should be 0 V. The zero-code error is always positive in the AD5040/AD5060 because the output of the DAC cannot go below 0 V. This is due to a combination of the offset errors in the DAC and output amplifier. Zero-code error is expressed in mV. Full-Scale Error Full-scale error is a measure of the output error when full-scale code (0xFFFF AD5060, 0x3FFF AD5040) is loaded to the DAC register. Ideally, the output should be VDD − 1 LSB. Full-scale error is expressed in percent of full-scale range. Total Unadjusted Error (TUE) Total unadjusted error is a measure of the output error taking all the various errors into account. A typical AD5060 TUE vs. code plot is shown in Figure 6. Offset Error Drift This is a measure of the change in zero-code error with a change in temperature. It is expressed in μV/°C. Gain Error Drift This is a measure of the change in gain error with changes in temperature. It is expressed in (ppm of full-scale range)/°C. Digital-to-Analog Glitch Impulse Digital-to-analog glitch impulse is the impulse injected into the analog output when the input code in the DAC register changes state. It is normally specified as the area of the glitch in nV-s and is measured when the digital input code is changed by 1 LSB at the worst case code 53786; see Figure 23 and Figure 24. The expanded view in Figure 23 shows the glitch generated following completion of the calibration routine; Figure 24 zooms in on this glitch. Digital Feedthrough Digital feedthrough is a measure of the impulse injected into the analog output of the DAC from the digital inputs of the DAC, but is measured when the DAC output is not updated. It is specified in nV-s and measured with a full-scale code change on the data bus—that is, from all 0s to all 1s, and vice versa. Gain Error This is a measure of the span error of the DAC. It is the deviation in slope of the DAC transfer characteristic from ideal, expressed as a percent of the full-scale range. Rev. A | Page 14 of 24 AD5040/AD5060 THEORY OF OPERATION SERIAL INTERFACE The AD5040/AD5060 are single 14-/16-bit, serial input, voltage output DACs. The parts operate from supply voltages of 2.7 V to 5.5 V. Data is written to the AD5060 in a 24-bit word format, and to the AD5040 in a 16-bit word format, via a 3-wire serial interface. The AD5060/AD5040 have a 3-wire serial interface (SYNC, SCLK, and DIN), which is compatible with SPI, QSPI, and MICROWIRE interface standards, as well as most DSPs. Figure 2 shows a timing diagram of a typical AD5060 write sequence. Both the AD5040 and AD5060 incorporate a power-on reset circuit that ensures the DAC output powers up to a known output state (midscale or zero-scale, see the Ordering Guide). The devices also have a software power-down mode that reduces the typical current consumption to less than 1 μa. The write sequence begins by bringing the SYNC line low. For the AD5060, data from the DIN line is clocked into the 24-bit shift register on the falling edge of SCLK. The serial clock frequency can be as high as 30 MHz, making these parts compatible with high speed DSPs. On the 24th falling clock edge, the last data bit is clocked in and the programmed function is executed (that is, a change in the DAC output or a change in the mode of operation). DAC ARCHITECTURE The DAC architecture of the AD5060 consists of two matched DAC sections. A simplified circuit diagram is shown in Figure 40. The 4 MSBs of the 16-bit data-word are decoded to drive 15 switches, E1 to E15. Each of these switches connects 1 of 15 matched resistors to either DACGND or the VREF buffer output. The remaining 12 bits of the data-word drive switches S0 to S11 of a 12-bit voltage mode R-2R ladder network. At this stage, the SYNC line can be kept low or be brought high. In either case, it must be brought high for a minimum of 12 ns before the next write sequence so that a falling edge of SYNC can initiate the next write sequence. Because the SYNC buffer draws more current when VIH = 1.8 V than it does when VIH = 0.8 V, SYNC should be idled low between write sequences for an even lower power operation of the part. As previously indicated, however, it must be brought high again just before the next write sequence. The AD5040 requires 16 clock periods to update the input shift register. On the 16th falling clock edge, the last data bit is clocked in and the programmed function is executed (that is, a change in the DAC output or a change in the mode of operation). VOUT 2R 2R 2R 2R 2R 2R S0 S1 S11 E1 E2 E15 12-BIT R-2R LADDER 04767-027 VREF FOUR MSBs DECODED INTO 15 EQUAL SEGMENTS Figure 40. AD5060 DAC Ladder Structure REFERENCE BUFFER Input Shift Register The AD5040 andAD5060 operate with an external reference. The reference input (VREF) has an input range of 2 V to VDD − 50 mV. This input voltage is then used to provide a buffered reference for the DAC core. The AD5060 input shift register is 24 bits wide; see Figure 41. PD1 and PD0 are control bits that control the operating mode of the part—normal mode or any one of three power-down modes (see the Power-Down Modes section for more detail). The next 16 bits are the data bits. These are transferred to the DAC register on the 24th falling edge of SCLK. DB15 (MSB) 0 0 0 0 0 0 PD1 PD0 D15 D14 DB0 (LSB) D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 DATA BITS NORMAL OPERATION 0 0 0 1 3-STATE 1 0 100kΩ TO GND 1 1 1kΩ TO GND POWER-DOWN MODES Figure 41. AD5060 Input Register Content Rev. A | Page 15 of 24 04767-028 2R AD5040/AD5060 The AD5040 input shift register is 16 bits wide; see Figure 42. PD1 and PD0 are control bits that control the operating mode of the part—normal mode or any one of two power-down modes (see Power-Down Modes section for more detail). The next 14 bits are the data bits. These are transferred to the DAC register on the 16th falling edge of SCLK. POWER-ON RESET The AD5040 and AD5060 both contain a power-on reset circuit that controls the output voltage during power-up. The DAC register is filled with the zero-scale code or midscale code and the output voltage is set to zero scale or midscale (see the Ordering Guide for more details on the reset model). It remains there until a valid write sequence is made to the DAC. This is useful in applications where it is important to know the output state of the DAC while it is in the process of powering up. SYNC Interrupt In a normal write sequence for the AD5060, the SYNC line is kept low for at least 24 falling edges of SCLK, and the DAC is updated on the 24th falling edge. However, if SYNC is brought high before the 24th falling edge, the write sequence is interrupted. The shift register is reset and the write sequence is considered invalid. Neither an update of the DAC register contents nor a change in the operating mode occurs; see Figure 43. In a normal write sequence for the AD5040, the SYNC line is kept low for at least 16 falling edges of SCLK, and the DAC is updated on the 16th falling edge. However, if SYNC is brought high before the 16th falling edge, the write sequence is interrupted. The shift register is reset and the write sequence is considered invalid. Neither an update of the DAC register contents nor a change in the operating mode occurs. SOFTWARE RESET The AD5060 device can be put into software reset by setting all bits in the DAC register to 1; this includes writing 1s to Bit D23 and Bit D16, which is not the normal mode of operation. For the AD5040 this includes writing 1s to Bit D15 and Bit D14, which is also not the normal mode of operation. Note that the SYNC interrupt command cannot be performed if a software reset command is started in the AD5040 or AD5060. DB13 (MSB) PD1 PD0 D13 D12 DB0 (LSB) D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 DATA BITS 0 1 0 NORMAL OPERATION 3-STATE POWER-DOWN MODES 100kΩ TO GND 04767-074 0 0 1 Figure 42. AD5040 Input Register Content SCLK DIN DB23 DB0 DB23 INVALID WRITE SEQUENCE: SYNC HIGH BEFORE 24TH FALLING EDGE DB0 VALID WRITE SEQUENCE, OUTPUT UPDATES ON THE 24TH FALLING EDGE Figure 43. AD5060 SYNC Interrupt Facility Rev. A | Page 16 of 24 04767-031 SYNC AD5040/AD5060 POWER-DOWN MODES MICROPROCESSOR INTERFACING The AD5060 features four operating modes, and the AD5040 features three operating modes. These modes are software programmable by setting two bits in the control register (Bit DB17 and Bit DB16 in the AD5060 and Bit DB15 and Bit DB14 in the AD5040). Table 6 and Table 7 show how the state of the bits corresponds to the operating mode of the two devices. AD5040/AD5060 to ADSP-2101/ADSP-2103 Interface DB16 0 0 1 1 1 0 1 Operating Mode Normal operation Power-down modes: 3-state 100 kΩ to GND 1 kΩ to GND ADSP-2101/ ADSP-21031 AD5040/ AD50601 TFS DT SCLK Table 7. Operating Modes for the AD5040 DB15 0 DB14 0 0 1 1 1 0 1 Operating Mode Normal operation Power-down modes: 3-state 100 kΩ to GND See Software Reset section DIN SCLK 1ADDITIONAL PINS OMITTED FOR CLARITY Figure 45. AD5040/AD5060 to ADSP-2101/ADSP-2103 Interface AD5040/AD5060 to 68HC11/68L11 Interface In both the AD5060 and the AD5040, when the two most significant bits are set to 0, the part has normal power consumption. However, for the three power-down modes of the AD5060 and the two power down modes of the AD5040, the supply current falls to less than 1μA at 5 V (65 nA at 3 V). Not only does the supply current fall, but the output stage is also internally switched from the output of the amplifier to a resistor network of known values. This is advantageous because the output impedance of the part is known while the part is in power-down mode. The output is connected internally to GND through a 1 kΩ resistor (AD5060 only) or a 100 kΩ resistor, or it is left open-circuited (three-stated). The output stage is illustrated in Figure 44. AD5040/ AD5060 SYNC OUTPUT BUFFER Figure 46 shows a serial interface between the AD5040/ AD5060 and the 68HC11/68L11 microcontroller. SCK of the 68HC11/68L11 drives the SCLK pin of the AD5040/AD5060, while the MOSI output drives the serial data line of the DAC. The SYNC signal is derived from a port line (PC7). The setup conditions for correct operation of this interface require that the 68HC11/68L11 be configured so that its CPOL bit is 0 and its CPHA bit is 1. When data is being transmitted to the DAC, the SYNC line is taken low (PC7). When the 68HC11/68L11 is configured where its CPOL bit is 0 and its CPHA bit is 1, data appearing on the MOSI output is valid on the falling edge of SCK. Serial data from the 68HC11/68L11 is transmitted in 8-bit bytes with only 8 falling clock edges occurring in the transmit cycle. Data is transmitted MSB first. In order to load data to the AD5040/AD5060, PC7 is left low after the first eight bits are transferred, and a second serial write operation is performed to the DAC. PC7 is taken high at the end of this procedure. VOUT DAC POWER-DOWN CIRCUITRY RESISTOR NETWORK 04767-029 68HC11/ 68L111 AD5040/ AD50601 PC7 SYNC SCK SCLK MOSI Figure 44. Output Stage During Power-Down DIN 1ADDITIONAL PINS OMITTED FOR CLARITY The bias generator, the DAC core, and other associated linear circuitry are all shut down when power-down mode is activated. However, the contents of the DAC register are unaffected when in power-down. The time to exit power-down is typically 2.5 μs for VDD = 5 V, and 5 μs for VDD = 3 V; see Figure 29. Rev. A | Page 17 of 24 Figure 46. AD5040/AD5060 to 68HC11/68L11 Interface 04767-032 DB17 0 04767-030 Table 6. Operating Modes for the AD5060 Figure 45 shows a serial interface between the AD5040/AD5060 and the ADSP-2101/ADSP-2103. The ADSP-2101/ADSP-2103 should be set up to operate in the SPORT transmit alternate framing mode. The ADSP-2101/ADSP-2103 sport is programmed through the SPORT control register and should be configured for internal clock operation, active low framing, and 16-bit word length. Transmission is initiated by writing a word to the Tx register after the SPORT has been enabled. AD5040/AD5060 AD5040/AD5060 to Blackfin® ADSP-BF53x Interface AD5040/AD5060 to MICROWIRE Interface Figure 47 shows a serial interface between the AD5040/ AD5060 and the Blackfin ADSP-53x microprocessor. The ADSP-BF53x processor family incorporates two dual-channel synchronous serial ports, SPORT1 and SPORT0, for serial and multiprocessor communications. Using SPORT0 to connect to the AD5040/AD5060, the setup for the interface is: DT0PRI drives the SDIN pin of the AD5040/AD5060, while TSCLK0 drives the SCLK of the part; the SYNC is driven from TFS0. Figure 49 shows an interface between the AD5040/AD5060 and any MICROWIRE-compatible device. Serial data is shifted out on the falling edge of the serial clock and is clocked into the AD5040/AD5060 on the rising edge of the SK. AD5040/ AD50601 TSCLK0 SCLK TFS0 SYNC 1ADDITIONAL PINS OMITTED FOR CLARITY Figure 47. AD5040/AD5060 to Blackfin® ADSP-BF53x Interface AD5040/AD5060 to 80C51/80L51 Interface Figure 48 shows a serial interface between the AD5060/ AD5040 and the 80C51/80L51 microcontroller. The setup for the interface is: TxD of the 80C51/80L51 drives SCLK of the AD5040/AD5060 while RxD drives the serial data line of the part. The SYNC signal is again derived from a bitprogrammable pin on the port. In this case, Port Line P3.3 is used. When data is to be transmitted to the AD5040, P3.3 is taken low. The 80C51/80L51 transmits data only in 8-bit bytes; thus only 8 falling clock edges occur in the transmit cycle. To load data to the DAC, P3.3 is left low after the first eight bits are transmitted, and a second write cycle is initiated to transmit the second byte of data. P3.3 is taken high following the completion of this cycle. The 80C51/80L51 outputs the serial data in a format which has the LSB first. The AD5040/AD5060 require data to be received with the MSB as the first bit. The 80C51/80L51 transmit routine should take this into account. 80C51/80L511 SYNC TxD SCLK RxD DIN 04767-034 AD5040/ AD50601 P3.3 CS SYNC SK SCLK SO DIN 1ADDITIONAL PINS OMITTED FOR CLARITY DIN 04767-033 DT0PRI AD5040/ AD50601 1ADDITIONAL PINS OMITTED FOR CLARITY Figure 48. AD5040/AD5060 to 80C51/80L51 Interface Rev. A | Page 18 of 24 Figure 49. AD5040/AD5060 to MICROWIRE Interface 04767-035 ADSP-BF53x1 MICROWIRE1 AD5040/AD5060 APPLICATIONS output noise in the 0.1 Hz to 10 Hz region. Table 8 shows examples of recommended precision references for use as a supply to the AD5040/AD5060. CHOOSING A REFERENCE FOR THE AD5040/ AD5060 To achieve the optimum performance from the AD5040/ AD5060, carefully choose a precision voltage reference. The AD5040/AD5060 have just one reference input, VREF. The voltage on the reference input is used to supply the positive input to the DAC. Therefore, any error in the reference is reflected in the DAC. Table 8. Precision References for the AD5040/AD5060 There are four possible sources of error to consider when choosing a voltage reference for high accuracy applications: initial accuracy, ppm drift, long-term drift, and output voltage noise. Initial accuracy on the output voltage of the DAC leads to a full-scale error in the DAC. To minimize these errors, a reference with high initial accuracy is preferred. Also, choosing a reference with an output trim adjustment, such as an ADR43x device, allows a system designer to trim out system errors by setting a reference voltage to a voltage other than the nominal. The trim adjustment can also be used at temperature to trim out any errors. Because the supply current required by the AD5040/AD5060 is extremely low, the parts are ideal for low supply applications. The ADR395 voltage reference is recommended. This requires less than 100 μA of quiescent current and can, therefore, drive multiple DACs in one system, if required. It also provides very good noise performance at 8 μV p-p in the 0.1 Hz to 10 Hz range. 7V SYNC SCLK DIN 0.1 Hz to 10 Hz Noise (μV p-p typ) 8 3.4 10 10 8 BIPOLAR OPERATION USING THE AD5040/ AD5060 The AD5040/AD5060 have been designed for single-supply operation, but a bipolar output range is also possible using the circuit in Figure 51. The circuit shown yields an output voltage range of ±5 V. Rail-to-rail operation at the amplifier output is achievable using an AD8675/AD820/AD8032 or an OP196/ OP295. The output voltage for any input code can be calculated as D ⎞ ⎛ R1 + R 2 ⎞ ⎡ ⎛ R 2 ⎞⎤ VO = ⎢V DD × ⎛⎜ ⎟×⎜ ⎟ − V DD × ⎜ ⎟ ⎝ 65536 ⎠ ⎝ R1 ⎠ ⎝ R1 ⎠⎥⎦ ⎣ where D represents the input code in decimal (0 to 65536, AD5060). With VREF = 5 V, R1 = R2 = 10 kΩ: AD5040/ AD5060 10 × D ⎞ VO = ⎛⎜ ⎟−5V ⎝ 65536 ⎠ VOUT = 0V TO 5V Figure 50. ADR395 as Reference to AD5060/AD5040 Long-term drift is a measure of how much the reference drifts over time. A reference with a tight long-term drift specification ensures that the overall solution remains relatively stable during its entire lifetime. The temperature coefficient of a reference output voltage affects INL, DNL, and TUE. A reference with a tight temperature coefficient specification should be chosen to reduce the temperature dependence of the DAC output voltage on ambient conditions. Using the AD5060, this is an output voltage range of ±5 V with 0x0000 corresponding to a −5 V output and 0xFFFF corresponding to a +5 V output . R2 = 10kΩ +5V +5V In high accuracy applications, which have a relatively low noise budget, reference output voltage noise needs to be considered. It is important to choose a reference with as low an output noise voltage as practical for the system noise resolution required. Precision voltage references, such as the ADR435, produce low Rev. A | Page 19 of 24 10μF R1 = 10kΩ 0.1μF VREF AD5040/ AD5060 – AD820/ OP295 + VOUT ±5V –5V 3-WIRE SERIAL INTERFACE Figure 51. Bipolar Operation with the AD5040/AD5060 04767-037 3-WIRE SERIAL INTERFACE Temp. Drift (ppm/°C max) 3 (SO-8) 3 (SO-8) 3 (SO-8) 3 (SC70) 9 (TSOT-23) 5V 04767-036 ADR395 Part No. ADR435 ADR425 ADR02 ADR02 ADR395 Initial Accuracy (mV max) ±2 ±2 ±3 ±3 ±5 AD5040/AD5060 USING THE AD5040/AD5060 WITH A GALVANICALLY ISOLATED INTERFACE CHIP POWER SUPPLY BYPASSING AND GROUNDING In process control applications in industrial environments, it is often necessary to use a galvanically isolated interface to protect and isolate the controlling circuitry from any hazardous common-mode voltages that can occur in the area where the DAC is functioning. iCoupler® provides isolation in excess of 2.5 kV. Because the AD5040/AD5060 use a 3-wire serial logic interface, the ADuM130x family provides an ideal digital solution for the DAC interface. When accuracy is important in a circuit, it is helpful to carefully consider the power supply and ground return layout on the board. The printed circuit board containing the AD5040/ AD5060 should have separate analog and digital sections, each having its own area of the board. If the AD5040/AD5060 are in a system where other devices require an AGND-to-DGND connection, the connection should be made at one point only. This ground point should be as close as possible to the AD5040/AD5060. The ADuM130x isolators provide three independent isolation channels in a variety of channel configurations and data rates. They operate across the full range from 2.7 V to 5.5 V, providing compatibility with lower voltage systems as well as enabling a voltage translation functionality across the isolation barrier. Figure 52 shows a typical galvanically isolated configuration using the AD5040/AD5060. The power supply to the part also needs to be isolated; this is accomplished by using a transformer. On the DAC side of the transformer, a 5 V regulator provides the 5 V supply required for the AD5040/AD5060. 5V REGULATOR 10μF POWER 0.1μF VDD V1A V0A SCLK AD5040/ AD5060 ADuM1300 SDI V1B V0B SYNC DATA V1C V0C DIN VOUT GND The power supply line itself should have as large a trace as possible to provide a low impedance path and reduce glitch effects on the supply line. Clocks and other fast switching digital signals should be shielded from other parts of the board by a digital ground. Avoid crossover of digital and analog signals, if possible. When traces cross on opposite sides of the board, ensure that they run at right angles to each other to reduce feedthrough effects on the board. The best board layout technique is the microstrip technique where the component side of the board is dedicated to the ground plane only, and the signal traces are placed on the solder side. However, this is not always possible with a two-layer board. 04767-038 SCLK The power supply to the AD5040/AD5060 should be bypassed with 10 μF and 0.1 μF capacitors. The capacitors should be physically as close as possible to the device with the 0.1 μF capacitor ideally right up against the device. The 10 μF capacitors are the tantalum bead type. It is important that the 0.1 μF capacitor has low effective series resistance (ESR) and effective series inductance (ESI), as do common ceramic types of capacitors. This 0.1 μF capacitor provides a low impedance path to ground for high frequencies caused by transient currents due to internal logic switching. Figure 52. AD5040/AD5060 with a Galvanically Isolated Interface Rev. A | Page 20 of 24 AD5040/AD5060 OUTLINE DIMENSIONS 3.00 2.90 2.80 1.70 1.60 1.50 8 7 6 5 1 2 3 4 3.00 2.80 2.60 PIN 1 INDICATOR 0.65 BSC 1.95 BSC 1.45 MAX 0.95 MIN 0.15 MAX 0.05 MIN 0.38 MAX 0.22 MIN 0.22 MAX 0.08 MIN SEATING PLANE 8° 4° 0° 0.60 BSC 0.60 0.45 0.30 121608-A 1.30 1.15 0.90 COMPLIANT TO JEDEC STANDARDS MO-178-BA Figure 53. 8-Lead Small Outline Transistor Package [SOT-23] (RJ-8) Dimensions shown in millimeters ORDERING GUIDE Model 1 AD5040BRJZ-500RL7 AD5040BRJZ-REEL7 AD5060ARJZ-1500RL7 AD5060ARJZ-1REEL7 AD5060ARJZ-2REEL7 Temperature Range −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 Maximum INL 1 LSB 1 LSB 2 LSB 2 LSB 2 LSB AD5060ARJZ-2500RL7 −40°C to +85°C 2 LSB AD5060BRJZ-1500RL7 AD5060BRJZ-1REEL7 AD5060BRJZ-2REEL7 −40°C to +85°C −40°C to +85°C −40°C to +85°C 1 LSB 1 LSB 1 LSB AD5060BRJZ-2500RL7 −40°C to +85°C 1 LSB AD5060YRJZ-1500RL7 AD5060YRJZ-1REEL7 EVAL-AD5060EBZ −40°C to +125°C −40°C to +125°C ±1.5 LSB ±1.5 LSB 1 Description 2.7 V to 5.5 V, reset to 0 V 2.7 V to 5.5 V, reset to 0 V 2.7 V to 5.5 V, reset to 0 V 2.7 V to 5.5 V, reset to 0 V 2.7 V to 5.5 V, reset to midscale 2.7 V to 5.5 V, reset to midscale 2.7 V to 5.5 V, reset to 0 V 2.7 V to 5.5 V, reset to 0 V 2.7 V to 5.5 V, reset to midscale 2.7 V to 5.5 V, reset to midscale 2.7 V to 5.5 V, reset to 0 V 2.7 V to 5.5 V, reset to 0 V Z = RoHS Compliant Part. Rev. A | Page 21 of 24 Package Description 8 Lead SOT-23 8 Lead SOT-23 8 Lead SOT-23 8 Lead SOT-23 8 Lead SOT-23 Package Option RJ-8 RJ-8 RJ-8 RJ-8 RJ-8 Branding D4C D4C D3Z D3Z D41 8 Lead SOT-23 RJ-8 D41 8 Lead SOT-23 8 Lead SOT-23 8 Lead SOT-23 RJ-8 RJ-8 RJ-8 D3W D3W D3X 8 Lead SOT-23 RJ-8 D3X 8 Lead SOT-23 8 Lead SOT-23 Evaluation Board RJ-8 RJ-8 D6F D6F AD5040/AD5060 NOTES Rev. A | Page 22 of 24 AD5040/AD5060 NOTES Rev. A | Page 23 of 24 AD5040/AD5060 NOTES © 2005-2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04767-0-1/10(A) Rev. A | Page 24 of 24