LTM2895 100MHz Isolated DAC SPI Serial Interface FEATURES DESCRIPTION n Isolated Interface: 6000V for 1 Minute The LTM 2895 is a high speed isolated Module (micro- RMS n CSA (IEC/UL) Approved, File 255632 module) SPI interface with DAC control signals designed n to isolate LTCs family of general purpose DACs and to 100MHz SPI-Compatible I/O n isolate general purpose SPI interfaces. The LTM2895 Configurable SPI Word-Length: 8 to 32 Bits n works with DACs and general purpose devices that have Supports Two Isolated Chip Selects n a mode (0, 0) SPI interface. Falling Edge Sensitive Low Jitter LOAD n Three Isolated Control or Multiplexer Signals The interface enables fast data throughput, which makes n 1.71V to 5.5V I/O Voltages the LTM2895 ideally suited for a wide variety of applica- n 3V to 5.5V Supply Voltages tions. The high speed SPI-compatible serial port supports n High Common Mode Transient Immunity 1.71V to 5.5V logic supplies. The LTM2895 is targeted at n 15mm 6.25mm BGA Package generic SPI and digital-to-analog converter applications. The isolation barrier tolerates large voltage ground varia- APPLICATIONS tions between the logic interface and the isolated side of the LTM2895. Uninterrupted communication is maintained n Remote Interface Control during voltage transients greater than 50kV/s. n Industrial Process Control and Automation All registered trademarks and trademarks are the property of their respective owners. n Test and Measurement Equipment n Breaking Ground Loops TYPICAL APPLICATION LTC2642-16 DAC Isolation LT6654-5 8V V V 3.3V 5V i IN OUT i GND 10F 10k V V V V V 5V DD L CC CC2 L2 i ON ON ON2 SYSINT BUSY V REF LTM2895 DD 100k FLTINT FAULT 27pF RFB LOAD LOAD LOAD2 8V i CS CS SS SS2 P I NV CS2 SSB SSB2 SCK SCK SCK2 SCK LT1468 OUT LTC2642-16 MOSI MOSI MOSI2 D + IN V MISO MISO MISO2 OUT SA SA2 CLR CLR 8V i SB SB2 SC SC2 GND GND GND GND2 2895TA01 CONFIGURATION REGISTERS: WRITE 0x30H AND 0x83H SETS SCK2 TO 33MHz AND WORDLENGTH TO 16-BIT V = ISOLATED VOLTAGE SUPPLY i 2895fa 1 For more information www.linear.com/LTM2895 ISOLATION BARRIERLTM2895 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltages Isolated Signals V GND .................................................0.3V to 6V SS2, SSB2, MISO2, ON2, LOAD2, SCK2 L V GND ...............................................0.3V to 6V SA2, SB2, SC2, MOSI2 .....GND2 0.3V to V + 0.3V CC L2 Isolated Supply Voltages Operating Temperature Range (Note 10) V GND2 .............................................0.3V to 6V LTM2895C ............................................... 0C to 70C L2 V GND2 ............................................0.3V to 6V LTM2895I ............................................40C to 85C CC2 Logic Signals LTM2895H .........................................40C to 125C ON, LOAD, BUSY, SA, SB, SC, SS, SSB Storage Temperature Range .................. 55C to 125C SCK, MOSI, MISO ................ GND 0.3V to V + 0.3V Maximum Internal Operating Temperature ............ 125C L FAULT ............................................... GND 0.3V to 6.3V Peak Body Reflow Temperature ............................260C PIN CONFIGURATION TOP VIEW 6 LOAD FAULT SC SC2 DNC LOAD2 5 BUSY GND SB SB2 GND2 DNC 4 SCK SSB SA SA2 SSB2 SCK2 3 MOSI GND GND GND2 GND2 MOSI2 2 SS MISO GND GND2 MISO2 SS2 1 ON V V V V ON2 L CC CC2 L2 A B C D E F G H J K L M N P R BGA PACKAGE 36-LEAD (15mm 6.25mm 2.06mm) T = 125C, = 36C/W, = 27.5C/W, = 17.5C/W JMAX JA JCTOP JCBOTTOM = 19.1C/W, WEIGHT = 0.36g JB ORDER INFORMATION