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Optical imaging payload

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Block diagram

Optical imaging payload

Block diagram

Overview

Imaging satellites continuously monitor the planet for various tasks such as weather, mapping or surveillance.

Design requirements

Modern optical imaging payloads require:

  • Fast, high-resolution imaging pipelines to acquire detailed image data.
  • Low-noise clocking solutions to maximize the performance of the sensors and digitizers.
  • Radiation hardened electronics to survive the harsh environment of space.
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Block diagram

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Optical imaging payload

Storage Storage SRAM SRAM DDR DDR DDR regulator DDR regulator Clock generation Clock generation Clock jitter cleaner Clockjitter cleaner Clock synthesizer Clock synthesizer Optics Optics Sensor Sensor Analog front-end Analog front-end Power management Power management Signal conditioning Signal conditioning VGA VGA S/H amp S/Hamp VGA VGA S/H amp S/Hamp Image processing and control Image processing and control Processor (DSP) Processor(DSP) FPGA FPGA MCU MCU Payload interface Payload interface CAN CAN SERDES SERDES LVDS/ECL LVDS/ECL Ethernet Ethernet RS232 RS422 RS485 RS232RS422RS485 Point of load (POL) supply Point of load (POL) supply DC-DC converter DC-DC converter LDO LDO Power distribution Power distribution Load switch Load switch -- or -- -- or -- Offset calibration Offset calibration Amp Amp DAC DAC Digitizer Digitizer High speed ADC High speed ADC High speed ADC High speed ADC Clock distribution Clock distribution Clock buffer Clock buffer Amp Amp Logic Logic Reference Reference Voltage reference Voltage reference Amp Amp System sensing System sensing Temperature Sensor TemperatureSensor Current Sensor Current Sensor ⎎ ⎎ ADC ADC

Payload interface

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Wired signal interface is for communication with other system blocks within the satellite. The wired interface includes ethernet, RS-485, CAN, which are typically used for control, monitoring and data transfer.

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Interface (6)
RS-485 & RS-422 transceivers
  • THVD9491-SEP—Radiation-tolerant 3V to 5.5V RS-485 transceiver with flexible I/O supply and IEC ESD
    Data sheet: PDF | HTML
  • SN65C1168E-SEP—Radiation hardened RS-422 dual differential drivers and receivers in space Enhanced Plastic
    Data sheet: PDF | HTML
CAN transceivers
  • SN55HVD233-SEP—Radiation hardened 3.3V CAN transceiver in space enhanced plastic package with standby mode
    Data sheet: PDF | HTML
LVDS, M-LVDS & PECL ICs
Logic & voltage translation (5)
Direction-controlled voltage translators
  • SN54SLC8T245-SEP—Radiation-tolerant, eight-bit, 0.65-V to 3.3-V, direction-controlled level translator
    Data sheet: PDF | HTML
Inverting buffers & drivers
Noninverting buffers & drivers
  • SN54LVTH162244-SP—Space 16-ch, 2.7-V to 3.6-V buffers with bus-hold, TTL-compatible CMOS inputs and 3-state outputs
    Data sheet: PDF | HTML
  • SN54LVTH244A-SP—Space 8-ch, 2.7-V to 3.6-V buffers with bus-hold, TTL-compatible CMOS inputs and 3-state outputs
    Data sheet: PDF | HTML

    Technical documentation

    View all 10
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    Type Title Date
    Application note Failure Containment in Spacecraft Point-of-Load Power Supplies 30 Apr 2020
    E-book Radiation Handbook for Electronics (Rev. A) 28 Oct 2020
    Application note TI Space Rated Power Solution for Microsemi® RTG4™ FPGA (Rev. B) PDF | HTML 19 Jan 2023
    Technical article 4 trends in space-grade power management PDF | HTML 16 Aug 2023
    Application note Measuring Die Temperature with Remote Diode Sensing in Space 13 Dec 2018
    Selection guide TI Space Products (Rev. J) 10 Jun 2024
    Technical article Why component integration carries weight for space-based PLL synthesizers PDF | HTML 06 Sep 2023
    Application brief CCD and CMOS Imagers in Space: Signal Processing Challenges and Solutions 05 Nov 2018
    Application note Rad-hardened FDA as Clock Buffer in Communication and Radar Payloads (Rev. A) 05 Aug 2019
    Application note Use of an LDO as a Load Switch for Space Applications 01 Aug 2018

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