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INTRODUCTION
The Holt HI-1590 Evaluation Board demonstrates features of the HI-1590 MIL-STD-1553B dual
transceiver IC. This device transmits and receives Manchester encoded 20 bit MIL-STD-1553B
serial data suitable bus transformers. Transceiver drive amplitude can be digitally adjusted from
0 to 26 Vp-p through the SPI interface. Adjustment can also be made with a 0 to 3.3VDC analog
control signal; a potentiometer is provided for this. Amplitude controls for both buses are
ganged together. In SPI mode, a low range option allows for more accurate amplitude
adjustment from 0 to 4.9 Vp-p. The board runs from a single 3.3V ±5% supply voltage. A MIL-
STD-1553B protocol message generator and receiver are included on the board to demonstrate
the HI-1590 features. The EVM (Evaluation Module) includes a microcontroller that generates
the SPI messages, the interface is through a terminal emulator connected to a PC through the
USB interface. The EVM is shown in the picture below:
3
AN-1590
Fig 1 – HI-1590 Evaluation Board
Holt Integrated Circuits
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