Rad-Tolerant Telemetry Controller IC
LX7730 Radiation Tolerant Telemetry Controller IC
The LX7730 is a spacecraft telemetry manager IC that functions as a companion to the FPGA. The LX7730 contains a 64 universal input multiplexer that can be configured as a mix of differential or single ended sensor inputs. There is a programmable current source that can be directed to any of the 64 universal inputs. The universal inputs can be sampled with a 12 bit analog-to-digital converter at a sample rate up to 13kHz. The universal inputs can also function as variable bi-level inputs with the threshold set by an internal 8 bit digital-to-analog converter. There is an additional 10 bit digital-to- analog current DAC with complementary outputs. Finally there are 8 fixed threshold bi-level inputs.
The LX7730 is register programmable with 17 addressable eight bit registers. Two options are available for communication with the host FPGA. First there is an eight bit parallel bus with 5 address bits and a read/write bit that can communicate at a speed of up to 25MHz. The second option is a pair of 12.5Mbps SPI interfaces that can support redundant (alternating not simultaneous) communication to two different hosts.
The LX7730 offers 1 kV ESD pin protection on FPGA interface pins and 500V ESD protection to all CH# and BLI# pins. The dielectric isolated process is failsafe. The LX7730 has enable registers that allow most of the device to be shut down to reduce power consumption and supports cold sparing on its signal pins.
The controller is designed for use in rugged environments. It is packaged in a 132 pin ceramic quad flat pack and operates over a -55°C to 125°C temperature range. It is radiation tolerant to 100krad TID and 50krad ELDRs as well as single event effects.
- 64 channel MUX
- Break-before-make switching
- 13kSPS 12 bit ADC
- 3% Precision Adjustable Current Source
- 1% Precision 5.00V Source
- Threshold Monitoring
- 8 x Bi-level Logic
- 10 bit DAC
- Supports Parallel or Dual SPI Interface
- Radiation Tolerant: 100krad TID, 50kad ELDRS
- Spacecraft Health Monitoring
- Attitude Control
- Payload Equipment
The FPGA directs LX7730 for
- Current source weighting and application
- Sample averaging for noise reduction
- Comparison bank sequencing
- Comparison threshold level
- Communication back to the system
- Sequencing of the input multiplexer
- Anti-aliasing bandwidth
- Timing for ADC acquisition
- ADC reference level
LX7730 Application Note: Eval Board User Guide
Analog Front End Integrated Circuits for Mixed Signal Spacecraft Applications
LX7730 Grounding Architecture & Notes
RADECS 2016 - Total Dose and Single Event Effects Hardening and Testing on Mixed Signal Telemetry LX7730 Controller