The ADK-15850 Demo Board provides a convenient way to evaluate the various unique features of Holt's HI-15850 transceiver. The HI-15850's features include 1.8V, 2.5V and 3.3V compatible digital I/O, making it easier to interface with a broad range of FPGAs. In addition, the device offers unique transmitter-induced tail-off compensation and optional receive output pulse extension.
1) Switches labeled TOC0A, TOC1A and TOC2A are used in combination to provide up to +150mV or -150mV DC tail-off adjustment on Bus A, which compensates for board layout deficiencies that cause consistent tail-off. The TOC switch settings select one of six correction levels.
2) The DIP switch labeled CLKENA on switch package SW3 may be used to control ENCLKA, which, when enabled, allows the CLKA input pin to synchronize the TXA and nTXA inputs for bus A transmissions. This mitigates input signal timing differences, helping to compensate for offset.