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LTM2893 Datasheet(PDF) 1 Page - Linear Technology |
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LTM2893 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTM2893/LTM2893-1 1 28931fb For more information www.linear.com/LTM2893 TYPICAL APPLICATION FEATURES DESCRIPTION 100MHz Isolated ADC Serial Interface The LTM®2893 is a high speed isolated μModule (micromodule)SPIinterfacewithADCcontrolsignals.The LTM2893 is optimized for isolating 1Msps high resolution 18-bitSARADCs,suchastheLTC2338andsimilarfamilies, and can interface with most general purpose ADCs. The LTM2893-1 is optimized for isolating the LTC2348 and similarfamiliesofsimultaneoussamplingADCsthatrequire writing configuration settings into the ADC. LTM2893 isolates the conversion start, sampling signal, with very low aperture jitter (30ps) and low latency (20ns). The interface enables fast throughput with no cycle 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 5.5V logic and is configurable for ADCs with 8 to 32 bit SPI word lengths. It also isolates three select signals (SA, SB, SC) for controlling analog multiplexers or gain settings. The isolation barrier tolerates large voltage ground variations between the logic interface and the isolated side of the LTM2893. Uninterrupted communication is maintainedduringvoltagetransientsgreaterthan50kV/µs. LTC2328-18 ADC Isolation AIN = ±10.24V, SNR = 95dB APPLICATIONS n Isolated Interface: 6000VRMS for 1 Minute n UL-CSA Recognition Pending n 100MHz SPI-Compatible I/O n Configurable SPI Word Length 8 to 32 Bits n Low Jitter Conversion Start (30psRMS) n Supports Simultaneously Sampled ADCs n Read Only (LTM2893), Read/Write (LTM2893-1) n Three Isolated Multiplexer Select Signals n 1.71V to 5.5V I/O Voltages n 3V to 5.5V Supply Voltages n High Common Mode Transient Immunity n 15mm × 6.25mm BGA Package n Remote Sensing n High Speed Data Acquisition n Industrial Process Control n Test and Measurement Equipment L , LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks and SoftSpan is a trademark of Analog Devices, Inc. All other trademarks are the property of their respective owners. LTM2893 VL VCC VL2 VCC2 CNV BUSY SS SCK MISOA SA SB SC SA2 SB2 SC2 CNV2 BUSY2 SS2 SCK2 MISOA2 CNV BUSY SPI INTERFACE BUFFER SELECT CNV2 BUSY2 SPI INTERFACE CNV BUSY SCK SDO RDL CHAIN VDD 5Vi 3.3Vi 5Vi 5V 3.3V 3.3Vi REFIN OVDD REFBUF VDDLBYP IN+ IN– VIN SHDN VOUT_F VOUT_S 0.1µF 10µF 2.2µF 47µF 3.3nF IN+ IN– OUT 2.2µF LTC2328-18 LTC6655-2.048 LT1468 6.8nF ±10V INPUT INPUT RETURN 500 20 20 MASTER FPGA 28931 TA01a 1µF +15Vi –15Vi 1µF SELECT2 |
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