LDM
This video shows the teardown and some tests performed on a modern VSI/TCAS IVA-81D indicator manufactured in 2001.
04:30 : Barometric mode test
05:45 : Self-test
07:05 : Teardown
There are various possibilities for the VSI input:
two ARINC 429 digital inputs
one ARINC 475 input (DC signal). Two other terminals are used for the voltage reference inputs (+/- 12V)
one ARIND 465 input (AC voltage). One other terminal is used for the reference signal
one pneumatic input
One ARINC 429 output is available for the connection to another VSI indicator
Main parts:
32-bits MPU MC68332 (NXP)
https://www.nxp.com/docs/en/user-guid...
FPGA EPF10K30RC208 (Altera)
SRAM IS61C1024 (ISSI)
AD7864: 12-bits, 4 channels ADC
https://www.analog.com/media/en/techn...
ADC10158: 10-bits+sign, 8-channels ADC
http://www.farnell.com/datasheets/911...
AD7714: 24-bits Sigma-Delta ADC
https://www.analog.com/media/en/techn...
INA114B: instrumentation amplifier
https://www.ti.com/lit/pdf/sbos014
UC1843AY: Current mode PWM Controller
https://www.microsemi.com/existing-pa...
BD429A: ARINC 429 Interface Line Driver
https://datasheetspdf.com/pdf-file/62...
OP297: Dual Precision Op-Amp
https://www.analog.com/media/en/techn...
MMAD1103: Steering Diode TVS Array TM
https://www.microsemi.com/existing-pa...
LM2941: Low Dropout Voltage Regulator
https://www.ti.com/lit/gpn/lm2941