40-Channel,16-Bit, Serial Input, Voltage Output DAC AD5370 FEATURES 2.5 V to 5.5 V digital interface Digital reset (RESET) 40-channel DAC in a 64-lead LFCSP and a 64-lead LQFP Clear function to user-defined SIGGNDx Guaranteed monotonic to 16 bits Simultaneous update of DAC outputs Maximum output voltage span of 4 V (20 V) REF Nominal output voltage span of 4 V to +8 V APPLICATIONS Multiple, independent output spans available Level setting in automatic test equipment (ATE) System calibration function allowing user-programmable Variable optical attenuators (VOA) offset and gain Optical switches Channel grouping and addressing features Industrial control systems Thermal shutdown function Instrumentation DSP/microcontroller-compatible serial interface SPI serial interface FUNCTIONAL BLOCK DIAGRAM DV V V CC DD SS AGND DGND LDAC VREF0 GROUP 0 16 16 16 BUFFER CONTROL OFS0 OFFSET REGISTER REGISTER 8 8 DAC 0 A/B SELECT TO BUFFER OUTPUT BUFFER REGISTER MUX2 AND 16 VOUT0 X2A X1A POWER-DOWN 16 16 16 16 REGISTER DAC 0 REGISTER VOUT1 CONTROL DAC 0 REGISTER 16 X1B X2B VOUT2 REGISTER REGISTER 16 16 VOUT3 M REGISTER 16 VOUT4 16 C REGISTER VOUT5 VOUT6 OUTPUT BUFFER 16 SERIAL X2A AND VOUT7 X1A 16 16 INTERFACE 16 16 REGISTER DAC 7 POWER-DOWN REGISTER SYNC DAC 7 REGISTER CONTROL SIGGND0 16 X1B X2B SDI REGISTER REGISTER 16 16 SCLK M REGISTER 16 16 SDO VREF1 C REGISTER GROUP 1 BUSY BUFFER 16 16 OFS1 OFFSET REGISTER DAC 1 RESET 8 8 TO A/B SELECT BUFFER OUTPUT BUFFER MUX2 REGISTER CLR AND 16 VOUT8 X2A X1A POWER-DOWN 16 16 16 16 REGISTER DAC 0 REGISTER VOUT9 CONTROL DAC 0 REGISTER STATE 16 X1B X2B VOUT10 MACHINE REGISTER REGISTER 16 16 VOUT11 16 M REGISTER 16 VOUT12 16 C REGISTER VOUT13 VOUT14 OUTPUT BUFFER 16 X2A AND VOUT15 X1A 16 16 16 16 REGISTER DAC 7 POWER-DOWN REGISTER DAC 7 REGISTER CONTROL 16 SIGGND1 X1B X2B REGISTER REGISTER 16 16 M REGISTER 16 16 C REGISTER AD5370 GROUP 2 TO GROUP 4 VOUT16 ARE THE SAME AS GROUP 1 TO VOUT39 SIGGND2 SIGGND3 SIGGND4 Figure 1. Rev. 0 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 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. MUX 1 MUX 1 MUX 1 MUX 1 MUX 2 MUX 2 MUX 2 MUX 2 05813-001AD5370 TABLE OF CONTENTS Features .............................................................................................. 1 Transfer Function....................................................................... 17 Applications....................................................................................... 1 Reference Selection .................................................................... 17 Functional Block Diagram .............................................................. 1 Calibration................................................................................... 18 Revision History ............................................................................... 2 Additional Calibration............................................................... 18 General Description ......................................................................... 3 Reset Function ............................................................................ 19 Specifications..................................................................................... 4 Clear Function ............................................................................ 19 Performance Specifications......................................................... 4 BUSY LDAC and Functions...................................................... 19 AC Characteristics........................................................................ 5 Power-Down Mode.................................................................... 19 Timing Characteristics ................................................................ 6 Thermal Shutdown Function ................................................... 19 Timing Diagrams.......................................................................... 6 Toggle Mode................................................................................ 20 Absolute Maximum Ratings............................................................ 9 Serial Interface ................................................................................ 21 ESD Caution.................................................................................. 9 SPI Write Mode .......................................................................... 21 Pin Configurations and Function Descriptions ......................... 10 SPI Readback Mode ................................................................... 21 Typical Performance Characteristics ........................................... 12 Register Update Rates ................................................................ 21 Terminology .................................................................................... 14 Channel Addressing and Special Modes................................. 21 Theory of Operation ...................................................................... 15 Special Function Mode.............................................................. 23 DAC Architecture....................................................................... 15 Power Supply Decoupling ......................................................... 25 Channel Groups.......................................................................... 15 Power Supply Sequencing ......................................................... 25 A/B Registers and Gain/Offset Adjustment............................ 16 Interfacing Examples ................................................................. 26 Load DAC.................................................................................... 16 Outline Dimensions....................................................................... 27 Offset DAC Channels ................................................................ 16 Ordering Guide .......................................................................... 27 Output Amplifier........................................................................ 17 REVISION HISTORY 4/08Revision 0: Initial Version Rev. 0 Page 2 of 28