LTM2893/LTM2893-1 100MHz Isolated ADC Serial Inter face FEATURES DESCRIPTION n Isolated Interface: 6000V for 1 Minute The LTM 2893 is a high speed isolated Module RMS n CSA (IEC/UL) Approved, File 255632 (micromodule) SPI interface with ADC control signals. The n LTM2893 is optimized for isolating 1Msps high resolution 100MHz SPI-Compatible I/O n 18-bit SAR ADCs, such as the LTC2338 and similar families, Configurable SPI Word Length 8 to 32 Bits n and can interface with most general purpose ADCs. The Low Jitter Conversion Start (30ps ) RMS n LTM2893-1 is optimized for isolating the LTC2348 and Supports Simultaneously Sampled ADCs n similar families of simultaneous sampling ADCs that require Read Only (LTM2893), Read/Write (LTM2893-1) n writing configuration settings into the ADC. LTM2893 Three Isolated Multiplexer Select Signals n isolates the conversion start, sampling signal, with very 1.71V to 5.5V I/O Voltages n low aperture jitter (30ps) and low latency (20ns). 3V to 5.5V Supply Voltages n High Common Mode Transient Immunity The interface enables fast throughput with no cycle n 15mm 6.25mm BGA Package latency, which makes the LTM2893 ideally suited for a wide variety of applications. The LTM2893 has a high speed SPI-compatible serial port that supports 1.71V to APPLICATIONS 5.5V logic and is configurable for ADCs with 8 to 32 bit SPI n Remote Sensing word lengths. It also isolates three select signals (SA, SB, n High Speed Data Acquisition SC) for controlling analog multiplexers or gain settings. n Industrial Process Control The isolation barrier tolerates large voltage ground n Test and Measurement Equipment variations between the logic interface and the isolated All registered trademarks and trademarks are the property of their respective owners. side of the LTM2893. Uninterrupted communication is maintained during voltage transients greater than 50kV/s. TYPICAL APPLICATION LTC2328-18 ADC Isolation A = 10.24V, SNR = 95dB IN 3.3Vi 5Vi LTC6655-2.048 +15Vi 3.3V V V IN OUT F 5V 5Vi 3.3Vi 1F SHDN V OUT S 2.2F V V V V L CC CC2 L2 0.1F 10F LTM2893 500 MASTER 10V 47F + IN FPGA OV V REFIN INPUT DD DD CNV CNV2 REFBUF CNV CNV2 CNV LT1468 OUT 20 BUSY BUSY2 + BUSY BUSY2 BUSY IN IN SS SS2 6.8nF SPI LTC2328-18 3.3nF SPI SCK SCK2 INTERFACE SCK INTERFACE MISOA MISOA2 IN SDO BUFFER 20 INPUT SA SA2 RDL VDDLBYP RETURN CHAIN SB SB2 1F SELECT SELECT2 SC SC2 2.2F 15Vi 28931 TA01a Rev C 1 Document Feedback For more information www.analog.com ISOLATION BARRIERLTM2893/LTM2893-1 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Supply Voltages 1 2 3 4 5 6 V to GND ................................................ 0.3V to 6V L ON SS MOSI SCK BUSY CNV V to GND .............................................. 0.3V to 6V A CC V L MISOA MISOB CSC GND FAULT B V GND GND SA SB SC Isolated Supply Voltages CC C V to GND2 ............................................ 0.3V to 6V L2 D V to GND2 .......................................... 0.3V to 6V CC2 E Logic Signals F ON, CNV, BUSY, SA, SB, SC, G SS, CSC, MISOA, MISOB, H SCK, MOSI ........................... GND 0.3V to V + 0.3V L FAULT ........................................... GND 0.3V to 6.3V J K Isolated Signals L MISOA2, MISOB2, ON2, BUSY2, M BUSYS, MOSI2, CNV2, SCK2, SS2, V GND2 GND2 SA2 SB2 SC2 CC2 SA2, SB2, SC2 ..................GND2 0.3V to V + 0.3V N L2 V V L2 MISOA2 MISOB2 L2 GND2 BUSYS P Operating Temperature Range (Note 11) ON2 SS2 MOSI2 SCK2 BUSY2 CNV2 R LTM2893C ............................................... 0C to 70C LTM2893I ............................................40C to 85C BGA PACKAGE 36-PIN (15mm 6.25mm 2.06mm) LTM2893H ......................................... 40C to 125C T = 125C, = 36C/W, = 27.5C/W, = 17.5C/W JMAX JA JCTOP JCBOTTOM Storage Temperature Range .............. 55C to 125C = 19.1C/W, WEIGHT = 0.36g JB Maximum Internal Operating Temperature ....... 125C Peak Solder Reflow Temperature ......................260C ORDER INFORMATION PART MARKING PACKAGE MSL PART NUMBER TYPE BALL FINISH DEVICE FINISH CODE RATING TEMPERATURE RANGE LTM2893CY PBF 0C to 70C LTM2893IY PBF BGA SAC305 (RoHS) LTM2893Y e1 3 40C to 85C LTM2893HY PBF 40C to 125C LTM2893CY-1 PBF 0C to 70C LTM2893IY-1 PBF BGA SAC305 (RoHS) LTM2893Y-1 e1 3 40C to 85C LTM2893HY-1 PBF 40C to 125C Device temperature grade is indicated by a label on the shipping container. This product is not recommended for second side reflow. This product is moisture sensitive. For more information, go to Pad or ball finish code is per IPC/JEDEC J-STD-609. Recommended BGA PCB Assembly and Manufacturing Procedures. BGA Package and Tray Drawings Rev C 2 For more information www.analog.com