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News
100MHz SPI Isolators Facilitate Faster Data Converters
2016-11-08 | ReturnThe LTM2893 (read only) and LTM2893-1 (read/write) are designed to isolate Linear Technology’s general purpose successive approximation register (SAR) analog-to-digital converters (ADCs), including the LTC2378 family of 20-, 18- and 16-bit 1Msps SAR ADCs or the LTC2348 family of octal, 18- and 16-bit 200ksps/channel simultaneous sampling SAR ADCs. Additional high speed control signals provide support for parallel or chain-connected configurations, as well as analog multiplexers or programmable gain amplifiers. Configurable word length allows SPI access to be tailored to a specific ADC to maximize throughput. With only 30psRMS of additive jitter from input to output, the LTM2893 and LTM2893-1 minimize signal-to-noise ratio (SNR) degradation in ADCs due to jitter.
The LTM2895 is designed to isolate Linear Technology’s general purpose digital-toanalog converters (DACs), including the unipolar LTC2641 family or bipolar LTC2642 family of 16-/14-/12-bit unbuffered voltage output DACs. Additional high speed control signals provide support for dual channel, dual DAC, or host-to-host (i.e., FPGA to isolated FPGA with page mode data transfer) configurations, while a configurable word length allows SPI access to be tailored to a specific DAC to maximize throughput. A low 30psRMS jitter /LOAD signal path is also available for DACs with an asynchronous LOAD input.
The LTM2893, LTC2893-1 and LTM2895 are housed in a low profile 15mm x 6.25mm x 2.06mm surface mount BGA package; all integrated circuits and passive components are housed in this RoHS-compliant µModule package. All devices are available in commercial, industrial and automotive versions, supporting operating temperature ranges from 0°C to 70°C, –40°C to 85°C and –40°C to 125°C, respectively. The LTM2893 and LTM2893-1 are available now in production quantities, and the LTM2895 will be available later this year. Pricing starts at $8.95 each in 1,000-piece quantities. The LTM2893, LTM2893-1 and LTM2895 join a family of µModule isolators that includes isolated RS485, RS232, USB, CAN, I²C, and GPIO. Please visit www.linear.com/isolator for more product selection and information.
Summary of Features: LTM2893, LTM2893-1 & LTM2895
• Isolated Interface: 6000VRMS for 60 Seconds
• Up to 100MHz SPI Compatible I/O
• Configurable SPI Word Length: 8 to 32 Bits
• Supports Multi-Data Converter Configurations
• Low Jitter Conversion Start (LTM2893) & /LOAD (LTM2895) Signals
• Three Isolated Control or Multiplexer Select Signals
• 3V to 5.5V Supply Voltages
• High Common Mode Transient Immunity: >50kV/µs
• No External Components Required
• 15mm x 6.25mm x 2.06mm BGA Package
Pricing shown is for budgetary use only and may differ due to local duties, taxes, fees and exchange rates.
Source:http://www.linear.com/