Octal, 12-/14-/16-Bit SPI Voltage Output denseDAC with 5 ppm/C On-Chip Reference Data Sheet AD5628/AD5648/AD5668 FEATURES FUNCTIONAL BLOCK DIAGRAM V V /V DD REFIN REFOUT Low power, small footprint, pin-compatible octal DACs AD5628/AD5648/AD5668 1.25V/2.5V AD5668: 16 bits REF BUFFER AD5648: 14 bits INPUT DAC STRING LDAC V A OUT REGISTER REGISTER DAC A AD5628: 12 bits BUFFER DAC STRING INPUT V B OUT REGISTER REGISTER DAC B 14-lead/16-lead TSSOP, 16-lead LFCSP, and 16-lead WLCSP BUFFER INPUT DAC STRING V C SCLK OUT On-chip 1.25 V/2.5 V, 5 ppm/C reference REGISTER REGISTER DAC C INTERFACE BUFFER INPUT DAC STRING Power down to 400 nA at 5 V, 200 nA at 3 V SYNC LOGIC V D OUT REGISTER REGISTER DAC D 2.7 V to 5.5 V power supply BUFFER INPUT DAC STRING DIN V E OUT REGISTER REGISTER DAC E Guaranteed monotonic by design BUFFER INPUT DAC STRING V F REGISTER OUT REGISTER DAC F Power-on reset to zero scale or midscale BUFFER INPUT DAC STRING 3 power-down functions V G OUT REGISTER REGISTER DAC G Hardware LDAC and LDAC override function BUFFER INPUT DAC STRING V H OUT REGISTER REGISTER DAC H CLR function to programmable code POWER-DOWN POWER-ON LOGIC RESET Rail-to-rail operation 1 GND LDAC 1 CLR 1 RU-16 AND WLCSP PACKAGE ONLY. APPLICATIONS Figure 1. Process control Data acquisition systems Portable battery-powered instruments Digital gain and offset adjustment Programmable voltage and current sources Programmable attenuators GENERAL DESCRIPTION selectable output loads while in power-down mode for any or all The AD5628/AD5648/AD5668 devices are low power, octal, DAC channels. The outputs of all DACs can be updated simul- 12-/14-/16-bit, buffered voltage-output DACs. All devices taneously using the function, with the added functionality LDAC operate from a single 2.7 V to 5.5 V supply and are guaranteed of user-selectable DAC channels to simultaneously update. There monotonic by design. The AD5668 and AD5628 are available in is also an asynchronous CLR that updates all DACs to a user- both a 4 mm 4 mm LFCSP and a 16-lead TSSOP, while the programmable codezero scale, midscale, or full scale. AD5648 is available in both a 14-lead and 16-lead TSSOP. The AD5628/AD5648/AD5668 utilize a versatile 3-wire serial The AD5628/AD5648/AD5668 have an on-chip reference with interface that operates at clock rates of up to 50 MHz and is an internal gain of 2. The AD5628-1/AD5648-1/AD5668-1 have compatible with standard SPI, QSPI, MICROWIRE, and a 1.25 V 5 ppm/C reference, giving a full-scale output range DSP interface standards. The on-chip precision output amplifier of 2.5 V the AD5628-2/AD5648-2/AD5668-2 and AD5668-3 have enables rail-to-rail output swing. a 2.5 V 5 ppm/C reference, giving a full-scale output range of 5 V. The on-board reference is off at power-up, allowing the use PRODUCT HIGHLIGHTS of an external reference. The internal reference is enabled via a 1. Octal, 12-/14-/16-bit DAC. software write. 2. On-chip 1.25 V/2.5 V, 5 ppm/C reference. 3. Available in 14-lead/16-lead TSSOP, 16-lead LFCSP, and The part incorporates a power-on reset circuit that ensures that the 16-lead WLCSP. DAC output powers up to 0 V (AD5628-1/AD5648-1/AD5668-1, 4. Power-on reset to 0 V or midscale. AD5628-2/AD5648-2/AD5668-2) or midscale (AD5668-3) and 5. Power-down capability. When powered down, the DAC remains powered up at this level until a valid write takes place. typically consumes 200 nA at 3 V and 400 nA at 5 V. The part contains a power-down feature that reduces the current consumption of the device to 400 nA at 5 V and provides software- Rev. I 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20052014 Analog Devices, Inc. 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Technical Support www.analog.com 05302-001AD5628/AD5648/AD5668 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 D/A Section ................................................................................. 21 Applications ....................................................................................... 1 Resistor String ............................................................................. 21 Functional Block Diagram .............................................................. 1 Internal Reference ...................................................................... 21 General Description ......................................................................... 1 Output Amplifier ........................................................................ 22 Product Highlights ........................................................................... 1 Serial Interface ............................................................................ 22 Revision History ............................................................................... 2 Input Shift Register .................................................................... 23 Specifications ..................................................................................... 3 Interrupt .......................................................................... 23 SYNC AC Characteristics ........................................................................ 6 Internal Reference Register ....................................................... 24 Timing Characteristics ................................................................ 7 Power-On Reset .......................................................................... 24 Absolute Maximum Ratings ............................................................ 8 Power-Down Modes .................................................................. 24 ESD Caution .................................................................................. 8 Clear Code Register ................................................................... 24 Pin Configurations and Function Descriptions ........................... 9 Function .......................................................................... 26 LDAC Typical Performance Characteristics ........................................... 11 Power Supply Bypassing and Grounding ................................ 26 Terminology .................................................................................... 19 Outline Dimensions ....................................................................... 27 Theory of Operation ...................................................................... 21 Ordering Guide .......................................................................... 29 REVISION HISTORY 11/14Rev. H to Rev. I 9/10Rev. C to Rev. D Changes to Ordering Guide .......................................................... 29 Change to Title ...................................................................................1 2/14Rev. G to Rev. H Added 16-Lead LFCSP Throughout ................................ Universal Changes to Figure 1 .......................................................................... 1 Changes to Table 1 ............................................................................. 3 Change to Figure 6 ......................................................................... 10 Changes to Table 2 ............................................................................. 5 Change to Table 7 ........................................................................... 10 Changes to Table 3 ............................................................................. 6 Changes to Figure 45, Figure 46, and Figure 47 ......................... 17 Changes to Table 4 ............................................................................. 7 Changes to Ordering Guide .......................................................... 29 Deleted SnPb from Table 5 ............................................................... 8 Added Figure 5 Renumbered Sequentially ................................... 9 1/13Rev. F to Rev. G Changes to Table 6 ............................................................................. 9 Added WLCSP Reference TC of 15 ppm/C, Table 2 .................. 5 Replaced Typical Performance Characteristics Section ............ 10 Changes to Ordering Guide .......................................................... 29 Changes to Power-On Reset Section ........................................... 23 8/11Rev. E to Rev. F Updated Outline Dimensions ....................................................... 26 Added 16-Lead WLCSP ..................................................... Universal Changes to Ordering Guide .......................................................... 28 Added Figure 6 and Table 7 Renumbered Sequentially ........... 10 1/10Rev. B to Rev. C Changes to Figure 32 and Figure 33 ............................................. 15 Changes to Figure 3 ........................................................................ 10 Updated Outline Dimensions ....................................................... 26 Changes to Ordering Guide .......................................................... 28 Changes to Ordering Guide .......................................................... 28 2/09Rev. A to Rev. B 1/11Rev. D to Rev. E Changes to Reference Current Parameter, Table 1 ........................ 3 Changes to AD5628 Relative Accuracy, Zero-Code Error, Offset Changes to I (Normal Mode) Parameter, Table 1 ...................... 4 DD Error, and Reference TC Parameters, Table 1 ............................... 3 Changes to Reference Current Parameter, Table 2 ........................ 5 Changes to AD5628 Relative Accuracy, Zero-Code Error, Offset Changes to I (Normal Mode) Parameter, Table 2 ...................... 6 DD Error, and Reference TC Parameters, Table 2 ............................... 5 Changes to Output Voltage Settling Time, Table 3 ...................... 6 11/05Rev. 0 to Rev. A Added Figure 53 Renumbered Sequentially .............................. 17 Change to Specifications .................................................................. 3 Change to Output Amplifier Section ........................................... 21 Changes to Ordering Guide .......................................................... 28 10/05Revision 0: Initial Version Rev. I Page 2 of 29